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Патент USA US2105817

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Jan. 18, 1938;
lîd Aug. 15, l1935
5 Sheets-Sheet 1
Jan. 18, 1938.
Filed Aug. 15, 1935
3 SheetsQSheet 2
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S.nnwNÈ.„wwW. .
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Jan. 18,/1938.
‘ Filed Aug. 15, 1935
3 Sheets-Sheet 5
NE È34Ow.\
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mmawNRSM E.Y
Patented Jan. 18, 179.38
Nirso `'STATEs" - PATIENT" oFFicEffff
Rudolf M. Gstermann, Kenilworth„llll.,>and ¿Ar- ~
~thur Williams,` Munster, Ind., assignors to The
ï *Application
" ï 15 August
Serial No.'
N. `36363
Y. v_. "
The present invention relates to feed water
heating systems for boilers and has particular
reference to feed Water heating systems for locomotive boilers.
. _
In the interestsv ofboiler‘emciency, it is_ ‘desir
able to feed water to a lzlo'iler'V at .as_high’ aft'em
perature as possible and in the case of a loco
motive boiler it is ,also highly desirable in the in"
terestsv of Yfuel economy toj'preh’eat the lboiler
10 feed Water with heat recoveredfrom the exhaust
steam ofthe engine. The recovery of such‘heat,
in the case of a locomotive, represents a net gain,
for ordinarily in a locomotive the heatbf the
exhaust steam is Wasted._ ' _
In order to recover somevof _the _heat of the
exhaust steam andto provide'preheat‘ed' feed
Water for locomotives, numerous different forms
ofA preheating equipment have been heretofore
proposed among which the most'important are
an the systems comprising a boiler feed pump and
a feed Water heater, land systems comprising an
exhaust steam injector, that is, an injector in
which a part of the` power necessary to force
water to the boiler `is derived from the .con
‘ tionfproceeds
In accordance with
f' _the
'^ present
_ ; ' e invention,
~' „ »..
fee'd .
Water is "supplied to the boiler from an exhaust l0
steam injector to Which Water is supplied' vunder
substantial pressure, and V'at high velocityto the
condensing zone of the injecton, by pumping
is preferably
_ Further“, inthe
in _accordance
'form' of a With
_'mé'f 15
the invention, the injector is of the forcing'ty'pë,
which 'not only acts to heat _the feed water' by
condensing exhaustl`~- steam 'therewith' but also
delivers vit at apressure substantially above-thatA v
atwhich it 'isreceived‘fr'om the pumping means. "20
j In'ordenthatv the natureof thefinvention`> and
Vthe improved -results obtained vby, its use> may best
be understood, a practical example of apparatus
embodying the invention and illustrated in the
tion of a locomotive boiler feed Water Vheating
system are extremely severe in that' for a sys’
tem of this character to be satisfactory, it is nec
?.n essary for the system to be able'to operate
9 In the Vdravvir'igs,”Fig", 1` is _aside elevation'- of
throughout a wide range of capacitiesv and to op
partofA a’locornotive having a feed water heat,- «3'0
ing Ysystemy embodying the ‘invention applied
eratewith feed water Whicli'in manyjinstances
is very impure and which~moreovermay be sup-_
plied to the system at Widely varying initial tem
Sr‘ëFi'g; 2l is‘-~a'_`lori'gi_tudina1 central section of thè
on the line 2'-2lof Fig. v3;
When operating under these severe conditions,
both the pump and -feed Water' heater systems
and the exhaust steam injector systems are
capable of producing commercially successful re'
40 sults but eachof these types of systems has-very
definite inherent limitations Which render the
performance of the systems short of that which
it isdesirable to attain.
The principal object of the present invention- is
45 therefore to improve upon prior types of boiler
feed water heating systems and to provide novel
method and means for supplying, more eñ‘lciently
than heretofore, feed water preheated to Vhigh
temperature by the 'heat of exhaust steam. IA
5o further principal object‘of the invention is to
provide an'eiìîlcient feed :Water heating system
which lis »more simple andfrugged, -andfalso
cheaper', than systems ‘ofthe kind heretoforeèin.
ployed which are capableiof- producing even ap
Other `and
more detailedobjects
c of the, inv‘enî
, ` 5
_tion together vvitli` the'advantages to be' 'derived
from its‘use will appear as the> ensuing descripe
_accompanying _drawingswill k_now .be described 25
‘and lthe nature offits action explained, the scope
of the invention being set lforth in the appended
densation of exhaust steam.
The operating conditions raffecting the opera’
which vdoesïnot require periodic cleaning and
Vother ~_service attention' lrequired by Asuch of 'the
prior systemsas' are capable .of producing such
proximately comparable.. tl'iermaliîf.results,.L and
exhaust steam injectorshown in `ÍFigi and taken _
1 \
` 5
Fig; 3 lisa iplan lilietmpartly in section', ofßthe
fFig. -4-_is
a section
. . I
- - of>` part
_ Figi. 6_~,is a section ,taken-_on the line
6.'. of
‘ Fig. '1 isáa section on _enlarged scale of a
trolf'valveïfshovvn in Fig. l...
'_ '_ -fe'rring now vmore particularly _to-Figli», *_ e
locomotive boiler is indicated generally at _A,.the
’cabf'of the locomotive at_Bfandîthecylinder.A f
thefengine >atC.
'i The feedv pump is indicatedî’atDandthe
heißt Stefaï?iniector 1S ìrljdìßatedsenerally E.
2,105,817 `
injector. Preferably, for reasons hereinafter ex
plained, conduit I2 is provided with a check valve
I4 which opens toward the injector as indicated
and which is loaded by a relatively light load
which may be furnished by a spring such as in
dicated at I6. Water is delivered to the boiler
from the injector through the conduit I8 and
Chamber 6U is in communication with the de
livery conduit I2 from the pump D.
The annular passage between nozzles 54 and 56
is relatively large in area and interposed in this
passage between the nozzles there is a fixed
annular ring 62, which as will be observed from
Figs. 4 and 5, is provided with a series of periph
erally spaced parallel slots 64, the passages
the usual boiler check valve 2D. Exhaust steam
from the engine cylinder C is supplied to the in- . through which form an outlet of constant area
10 jector through conduit 22 and overflow from the
injector is carried to waste through conduit 24.
Live steam for operating the pump D is taken
from the boiler turret 2 6 through the supply con
duit 28 in which is located the main control valve
15 F which is preferably situated at a convenient
point in the cab B.
The flow of operating steam tothe pump is
controlled by a throttle valve 3U which may be of
any suitable form and which in the present in
stance has been shown more or less diagram
matically as controlled from the engine cab by
means of the operating hand wheel 32. Exhaust
from the pump is carried either to Waste or to
any point where the heat of low> pressure steam
25 may be utilized, through conduit 34.
Preferably, for reasons to- be hereinafter ex
plained, the pump D is of the centrifugal or other
rotary type although the invention in its broadest
aspects is not limited to this specific' type of pump.
30 For purposes of illustration, I have indicated a
centrifugal pump of known kind having a rotary
impeller 56.
from the Water chamber 69 tothe interior of noz
zle 56. A secondary steam nozzle 66 is slidably
mounted in the injector body in alignment with
the water nozzle and the space between nozzles
56 and 66 is placed in communication with the
main steam chamber 48 of the injector by means
of the passage 68 formed in the injector body.
'Thefinjector is further provided with the usual
combining tube li) and delivery tube 12, the
latter opening into the delivery chamber 'I4 which
in turn communicates with the delivery con
duit I8.
The injector has the usual overflow chamber
v'15in communication'with the overilow conduit 24.
VCommunication between the overflow chamber
and the overñow conduit is controlled in known 25
manner by an overflow valve (not shown) which
valve is loaded by delivery pressure in well-known
manner through the medium of a plunger sub
jected to such pressure and applying a load to
the delivery valve through a linkage indicated 30
generally at 'Iâ in Fig. 3. For details of con
struction of a typical example of loaded overflow
valve apparatus of the kind just described, refer
In order for the system to be able to supply
preheated feed water to the boiler when the en
gine is not running and exhaust steam is not
available, >there is provided means for operating
the injector E with live steam at reduced pressure
hereinafter referred to as auxiliary steam.` In
William A. Buckbee.
. Referring again to the sliding secondary nozzle
66, the quantity of steam admitted to the in
>the present embodiment, suchsteam is supplied
to the'injector’through"theïîbranch live steam
jector through the lsecondary steam opening is
controlled by the position of longitudinal move
'conduit 28a and the injector is further’providedV
ment oi'> this nozzle inthe casing'and in the em
bodiment illustrated the position of this nozzle is
determined by the position of rotation of the
spindle 80 which has fixed thereto the eccentric
pin 82 `moving in a suitable transverse slot cut 45
_in the nozzle. At its upper end, spindle 82 has
withan automatic changeover system operating
in response to the presence or absence of exhaust
steam to admit auxiliary live'steaml when such
steam is needed and to shut olf' the supply of
this steam when exhaust steam is available. To
this end there is provided an exhaust steam valve
indicated generally at G, an automatic change.
ence may be had to U. S. Patent No. 1,531,004
granted March 24, 1925, to Malcolm Hard and 35
fixed thereto a lever 84, the end of which is inter
posed between a spring loaded plunger 8E mount
over valve indicated at H and an exhaust steam
ed in the cylinder 88 ñxed to the injector body,
pressure responsive diaphragm valve indicated at
I. Valve G is connected to the live steam supply
and a plunger 90 mounted in a cylinder §22 which
is also fixed to the injector body. The interior of
cylinder 92 is placed in communication with the
pump delivery conduit i2 by means of pipe 94
in which pipe there is interposed the shut 01T
on the outlet side of the control valve F by means
of conduit 38 which, in this instance, is shown
connected to the branch conduit 28a. A conduit
55 40 connects a part of the >valve I with the exhaust
steam conduit 22, conduit 42 connects another
part of this valve with the changeover valve H
and still another part of the valve I is connected
by means of conduit 44 with a zone of low pres
60 sure which in the embodiment shown is a part of
the interior of the injector. E.
Referring now more particularly to Figs. 2 to 5,
the injector E comprises a body 46 providing a
steam chamber 48 to which the exhaust steam is
65 supplied from the conduit 22.
A nap valve 5B
ropening into the chamber and pivoted at 52
serves to prevent reverse flow of steam from
>chamber 48 to the exhaust steam supply- conduit
70 when exhaust steam is not available and> aux
iliary live steam is being used. The main steam
nozzle 54 and the water nozzle 56 are fixed in a
suitable web 58 in' the injector body whichY web
forms a water chamber 60 surrounding the steam
75 nozzle 54 and communicating with the nozzle 56.
valve or cock S6.
Considering nowv the automatic changeover
system for supplying auxiliary steam when ex
haust steam is not available, and referring more
particularly to Figs. 1,’ 6 and 7, the construction
of the changeover valve apparatus H is as fol
lows. The high pressure live steam conduit 28a
communicates with a chamber 9S in the injector
body which is in turnin communication with
chamber IDI) by way of the port | 02. A tapered
lplunger |04 extends into the port |02 to provide
a port opening of variable area depending upon
the position of the plunger. The upper end of
the plunger is located in a cylinder |06 which
is in communication with the chamber 93 by way 70
of clearance space around the plunger and the
plunger is urged toward its upper position giving
maximum area of flow through port |22 by spring
|08. Unbalanced steam pressure acting on the
top of the yplunger tends to move the plunger 75
downwardly into port |02 against the resistance of
vsince the injector 'Wlllïcommence' operation more
spring |08;
ïreadilyl‘if it is flooded with Water before steam
*"Aport ||0 -»provides communication' between
thechamber |00 and passage |'|2 leading to the
main steam» chamber 48 of the injector. This port
'is controlled by a changeover valvezmember ||4
’havingwa valve head'llíâ- at> 'its lower'end for
closing the port and a ypiston'||8 at its upper
end ¿which .operatesfin’ a cylinder |20. ' A small
10 passage | 22 providesconstant communication be
tween the steam chamber 98 and the portion of
cylinder |20 below piston ||8 and a -small leak
port |24 provides for ?low‘of a limited quantity of
steam from the portion of the cylinder |25 below
the/‘piston to the-portion above. The part of the
cylinder aboveïthepiston is connected by the con
The lpresence of'exhaust steam in conduit> 22
causes the diaphragm of valve I to keep the valve
member |30 in closed position-‘thus preventing
flow ‘of steam through’ conduit 42 fromv the
changeover valve cylinder |20. When the main
controluvalveF is opened, steam ñows through
branch 23a'to chamber 98 and through passage 10
|22Jtofcylinder |20. Because of the- port |24
throughthe piston H8, the pressure per unit of
arealon :the two sides of the piston is equalized.
team also ñows through the choke port |02 Vand
exertsl pressure on the upper side' of the valve
head |IS. Under these conditions, the combined
duit 42 to the diaphragm valve I shown in Fig. 7.
pressures» acting on the changeover valve mem
This-valve comprises a casing indicatedv generally
at -|26,fproviding» a diaphragm chamber in which
ber H4, due to the differences in'areas exposed‘to
20 is' mounted a ‘diaphragm.« |28- subjected to the
pressure of exhauststeam from the exhaust con
the jsame steam pressure, keep this valve seated
»as shown invFiggô and prevent the admission' of 20
auxiliary steam tothe injector.
duit 22 and ltransmitted to the diaphragm through
If it is ‘now’assumed that the-engine lceases
theconnection 40. The diaphragm has attached
operation and it is desired to continue the feed
to theboiler, the main control is allowed to re
main'open and auxiliary steam is admitted> to 25
thereto a valve" member ‘|38’ movableunder the
influence of exhaust steam .pressure to close com
munication between the vconduit 42 and‘chamber
|32 wh'i'chfis connectedby conduit 44 to the low
pressure steam chamber 48 of the injector. The
spring |34 holds the valve member |30 in open
position in the absence of exhaust steam’ pressure
the injector as follows.
The failure of exhaust
steam pressure permitsv spring |34 in the dia
phragmî valve to open the valve member so as to
vent the connection 42 by way of chamber .|32
and connection~44 to the low pressure steam v30
on the’ diaphragm. of >suiïicientvalue to overcome
chamber of the injector. ` If desired, the connec
the tension of the' spring.` `This `tension may be
adjusted by "means of the adjustment indicated
tion'44 may vvent 42 directly to atmosphere or
any other zone of low pressure. Failure of steam
- generally at |35.
In theV embodiment illustrated, the exhaust
valve G consists of a double seated valve mem
ber |38 urged toward its seat» by spring |40
pressureabove the piston ||8 of the changeover
valve, `due to venting of connection 42, reverses 35
the balance of lforces 'acting on Valve member
||4 and the pressure of steam below the piston
shiftsr this valve to open position, thus opening
and having connected thereto a piston |42 oper
port |‘|0. Live steamfrorn chamber |00 then
ating in a cylinder |44vwhich'is placed in com
40 munication with the high pressure steam conduit Ílowsto the main steam chamber of. the injec
28a by the conduit 38. The live steam branch tor to replace the exhaust steam and as soon as
conduit 28a may be advantageously provided with flow commences the plunger §04, in cooperation
a retarding valve indicated generally at |46, which with the port |02, acts as` a throttling choke to
may be of known construction and which, for the ` reduce the pressure of the auxiliary >steam flow
ing to the injector to a value approximating that 45
45 sakeof simplicity, has’ been indicated» more or
less'diagrammatically‘asy a spring loaded check of average exhaust steam pressure. Because 'of
the'fact that the boilerr pressure may vary over
valve loaded by spring |48.
The operation of the apparatus is as follows, comparatively wide limits, the area of the choke
port is preferably made variable under the inilu
assuming thelsystem. to be started when the loco
motive engine is running and exhaust steam is ence of variations in the pressure of the high 50
pressure steam, so as to insure substantiallyV con
' The main control valve F is opened‘to admit stant auxiliary ‘steam pressure, regardless of va
operating steam to the throttle valve controlling riations in boiler pressure.
It is believed >that the reverse’ action of the
pump D and this valve is opened by the control 32
to start operation of the pump. Water is forced changeover mechanism in shifting the injector 55
by the pump past the checkzvalve |4 to the water back to exhaust steam operation when exhaust
chamber 60 of . the injector and through the
steam is again available, will be evident `from
openings 64 in the water nozzle 62. yAt the same
the foregoing description.
time, the admissionfof steam tothe supply branch
In the embodiment of` apparatus illustrated,
the exhaust valve G is open at all times Íwhen 60
the system is in operation and this valve is pro
vided to prevent ñow of exhaust steam through
the injector and out they overflow when the en
60 28a andconduit 33 causes-„piston |42 to open
the valve member |38 of the exhaust valve G and
exhaust steam opens the flap. valve‘öû and flows
to nozzles 54 and 66. The mixture of steam. and
water `overflows' through the overflow conduit 24
65 (the, overflow valve being` unloaded because of
lackof deliverypressure) until the jet is estab
lished and deliverycommences.
When this oc
curs,?1the„overflow valveV is loaded by delivery
pressure through ,the loading mechanism in
cluding the'linkage it. The function ofthe re
>tarding valve |45, if it is employed, is to delay
the'flow of steam tothe exhaust valve operating
piston »sufficiently to `permit water to reach the
injector ahead of the >exhaust steam. This
facilitates@rapidityA ,of starting of fthe. injector
gine is running and the feed heating system is
not in operation.
'I'he check` valve |4 is provided in order to
prevent flow of water through the pump and the
overflow of the injector to waste when the sys
tem is not inïoperation and in the event. that
the injector is'placed at a level on the locomotive 70
which is below the level which may be attained
'by the watersupply in the tender tank. It will,
of course, be obvious that this check Valve may
beomitted if the injector is located atanplace
on .thalocomotive f above the‘- high waterrlevelfg of
>the tender tank and in this connection it ‘may be
pointed out that the usual manually controlled
valve for shutting olf the supply of Water to an
injector is not required With the presentarrange
It will be understood that While in order to
explain the nature of the invention a complete
system involving numerous elements of construc
tion has been shown, many of such elements and
10 the speciñc arrangement thereof may be varied
considerably Without departing from »the spirit
haust steam condensing stage and it is of course
Well known that hot suction water results in re1
atively poor injector operation and substantially
reduces the capacity range of operation of an
injector of given size. In the type of injector
where combined jets are used, the heating effect
of the high pressure steam jet is also present
and reduces the amount of exhaust steam which
can be condensed by a given amount of feed Wa 10
ter. Such reduction of course reduces the eiîec
tiveness of the exhaust steam injector which is
to condense the maximum amount of exhaust
or scope of the invention. For example, many
changes may be >made in the speciñc details of
structure or arrangement of the control system
steam and return it to the boiler.
for maintaining the injector in operation when
exhaust steam is not available and within the
In a system Vembodying the present invention, 15
these disadvantages and losses are eliminated
scope of the invention certain features thereof
may be used to the exclusion of others. For ex
ample, the control system for supplying the in
jector with auxiliary live steam may be omitted
entirely if the conditions surrounding a partic
ular installation are such that it is desirable to
since the required “boosting” pressure to enable
rely upon a simple live steam injector to feed to
the boiler such quantities of water as may be
required when steam is not being used by the
main engine.
Those factors in the operation of the system
which provide the improvements and advantages
thereof will now be briefly pointed out.
structurally the system presents many advanf
tages with respect to application to locomotive
Modern locomotives are of such large
dimensions that substantially all of the clear
ance space through tunnelsand the like is taken
up by them andthe large number of pieces of
auxiliary apparatus _carried by locomotivesmakes
it increasingly diliicult to ñnrd the space neces
‘ate lwith water heated by the low'pr'essure ex
sary to locatesuch equipment. Inv the present
system, both of the major items of equipment
are Vrelatively small in size andvdue to the,V fact
that they
be Widely separated, it is possible
to very easily mount them on a locomotive, as
for example in the rmannermindicated in À-Fig. 1,
With the pump at a low level near the tender end
of the locomotive, in a position Where advantage
can be taken of gravity feed of the whole water
supply to the pump, and with the injector mount
ed above the running gear ofV thelocomotive and
near to the engine cylinders so that arcompara
tively short length of exhaust steam piping to
the injector can be used. Great flexibility in the
matter of installation layout is thus possible
which is of substantial practical importance in
the application of the apparatus to locomotives
of widely differing design.
Inthis connection,
it may be pointed out that the injector is of very
much smaller bulk than a feed Water _heater
and can be located in many places on a locomo
the injector to feed to a high pressure boiler is
provided by mechanical means which does not
add heat to the water delivered to the injector.
Furthermore, another advantage of great Aim
portance is provided by forcing the Water under
relatively high pressure to the injector. By sup
plying water at high pressure to the injector, it
is possible to introduce the Water thereto at the 25
point Whereit meets the steam, with a velocity
highervthan. is possible with an ordinary injector,
so vthat the diiîerence between the steam and
Water velocities is decreased. In the ordinary
form of injector to which Water is supplied under 30
a relatively lowV pressure head, the iiow of water
through the Water nozzle of the injector may be
voi’the order of 30 to 50 feet per secon-d Whereas
the steam may have entering velocity of from
166.0 to 2,000 feet per second. This great diiîer-V
ence in ‘velocities introduces veryhigh shock
losses and we'have found that the high velocity
injection of water to an'injector by means of a
.pump supplying water to the‘inj'ector at high
pressure results in the obtaining ‘of a ?lnal de 40
livery .pressure considerably 'greater than the
tota-lof the delivery pressures obtainable by thc
use‘of the two devices separately. As an illus
tration of‘this, tests which We have made With
an injector alone of the kind illustrated, supplied 45
with Water at60° F. and exhaust steam at 1
pound gauge pressure, showed a delivery pres
sure of 146pounds per square inch, Witha de
livery temperature of 160° F.
When combined
with a pump delivering Water of the same tem
perature to the injector at 50 pounds pressure,
the ñnal delivery pressure attained was 225
pounds per square inch with exhaust steam be
ing supplied to the injector at the same pres
sure asin the precedingl test. Thus it is evident 55
that of the 79 pounds increase ‘in delivery pres
sure at least 29 ypounds of such increase is due
to the improvement inthe injector action by
the elimination of shock losses.
in accordance with the presen't’invention, we 60
tive where it would be impossible to ñnd the
space necessary for the feed Water heater.
It has been found from experience that it is . propose to introduce water to the injector with
impossible to deliver against the pressure of
modern boilers with an exhaust steam injector
operated entirely by exhaust steam. In order to
65 utilize exhaust steam injector apparatus to pump
against high boiler pressures, such injectors have
heretofore been made as two stage injectors with
a low pressure exhaust steam >operated stage and
a high pressure forcing stage operated by >live
steam or the necessary pumping power furnished
by a supplementary jet of high pressure live
steam operating in conjunction with the low
pressure exhaust steam jet or jets. Both of these
are'relatively inefficient. In the former case, the
high <pressure injector stage is required to oper
high entering velocity by supplying it 'to the in
jector at high pressure. For locomotive boiler
requirements, it is desirable that the system be
able to deliver against a minimum back pressure 65
of at least 300 pounds per square inch and to do
this with Water vsupplied to the system at an
Ainitial temperature which 'may be 'as high as
90°F. 'Ilo do this, a booster pressure rising to
maximum value of the order of 300 pounds per 70
square“ inch is contemplated. The high velocity
of the entering water, when supplied in accord
ance With the >present invention, introduces a
serious practical diilîculty if it is attempted
ordinary 'injector
nozzle construction.A
befeyident .thatnasïfthe pressure in_the conduit
having conventional nozzles of „OrdinaryV size
l2 rises, thepnozzle líìtìwill be moved tothe right
away` from ,the nozzleg56 to enlarge the second
ary steam opening and to .admit throughthis
The high water velocityngives 1 an
a tremendous Water capacityand for any reason
able injector capacity, nozzles of ordinary con
structionïhave to be placed soy closegtogether
that the water passage isr extremelyTv small.
opening largerquantities of steam.
The total'cross sectional area ‘forjflowr ofen
ture of -the .water delivered: to the injector ex
tering water in ari-injector which mayf-have
a maximum capacityinexcess of .40,000fpounds'
10 of water per hour maybe of the order of not
more than 10 to l5 hundredths of‘aisquare inch.
This area is so small that with the usual annular
nozzle, it is substantially impossible to keep the
minute clearance betweenthe nozzle walls from
becoming clogged with the impuritieszwhichas
a practical matter are always found in water as
fed to locomotive boilers. Consequently we. em-„
ploy what maybe said to be a shower nozzle
through vwhich `thewater. flows in a >plurality of
20 separate streams. We have foundbytests .that
the shower nozzle construction hereinbefore de
scribed is.> satisfactory` and .that .reliable lopera
tion.’ of the injector. can-be .depended .uponfwith
this type.' of nozzlelwhilel at the Isameïtimerob
taining goodv condensingresults .from the water
As previously pointed-outone. of íthe principal
functions of vaifee'd heatingisystem' of` thei kind
underf discussion is to condense and return’to the
30 boiler the maximum quantity of exhaust." steam.
The quantity of exhaust steam that can be' con
densed-and returned to the‘iboiler in an injector
is determined >primarily 'by two factors oneof
which is thequantityof water which isv being
35. pumped' to the boilerand the other of which is
the temperature of `the‘water a's supplied to the
' It lwill'be noted thatv in the construction `'of
the injector, as showninFig. 2, that we-pro'vide
for primary and secondary admission of exhaust
steam.' It will further be noted that lin v«this con
struction the primary steam nozzle -54 is» a di
verging nozzle. This‘forrn‘rof nozzle is most ef
Íective in producing the highest velocity ofthe
45 steam at'the p'ointwhere it meets the' entering
Water anditwill be further noted that the water
andthe steam ¿from the-primary nozzle come
together in nearly'parallel lines of'ilow..` VThisv
_condition makes-for 'the greatest effectiveness of
the water forcing action of the jet. On theother
hand, the secondaryl steaml inlet-'through nozzle
66 has converging ñow. "Velocity of'steam _at this
point 'is not sohigh nor is the steam directed into
the jet at as ,advantageous van a-ngleffrom' the
forcing standpoint. ` Cons‘eqru'ently,ïthisy second
ary ’jet maybe regarded as being-"most effective
as a heating jet for raisingfìthe temperature of
the water." 1n order_t'o‘take »advantageY of this,
we advantageously varyi‘ïthe opening 'for' sec
ondary admissionof‘st'eamso that the maximum
ycliiantity of steaml'will "bef condensed under any
givenl set of operating Qconditionlsf; ÍSince -¿the
amount of steam'ïwhich caribe> condensed isfde'
pendentl upon the VYquantity" of 'water Ábeing Had'
65 mittedv to I’the Vvinjector,
' 4rrange 'the ysliding
nozzle 6' n"r theïrnann'èr "already -‘ described> iso
that" the"positionl -of '- the nozzle _is dependentl upon
4:.We have found; however,`that if the tempera
ceedsï approximately 70° F.>,'that the condensing
capacity of the injector is so impaired that itis
notpossible to enlarge thesecondary steam open 10
ingwithout reducingthe capacity' range of the
injector to an -undesirable extent. In other words,
with' hot water the quantity of exhaustv steam'
condensed can not be progressively increased with
increase inï‘the amount- of water suppliedl and
becausev of thisithe shut off valvev 96 is provided
inthe .pressure conduit 94 so as to permit lthe.
secondary steam.inlet to be maintained in its.
minimu'mîcapacity position when desired.1 Whenv
applied t`oÍ locomotive feed water heatingsystems, 2,0;
this regulation-affords the possibility.’ 'of increas
ing the.:deliverytemperature of feed watertbya
substantial.Äamount‘ëduringthe greater part of
the' year, iti'being'usually ionly necessary to >out
thisïsècondary regulation. outy of action during 25.
a- few"`summerf months `:when the feed waterfrom
the .flocomotiv'e‘vtenderfi's too Warm Itc'rpermituti
liz'ation.ofthislregulation.'1v 1.5'
. :1:
,- r
ß While-'regulation ofthe'quantity of exhaustV
s-teamf admitted lin iorder »to `secure maximum feed 30
water heating effect has been ’shown as'acconr-I
plishedv solelyî‘through‘ regulation of th'e'second
ary’steam nozzle, it will-be apparent that'such
regulationçneed not necessarily` be limitedV to
varyingï-Ltheßareal of'fonlypne of -the two `steam 3.5,
previously mentionedit
L ' isnpreferableto'
-l ’if
a f rotary. ' pump for‘feeding water ’ to the injector,`
but the» use vof a reciprocating pump'is'ï'not’im
possible fifa pumpis employed Whichßhasísub 40
stantially'v constant ¿delivery 'pressurel without
pressure drops' oilarge -value Íbetween successive
pumpfstrokesìflWe have constructedia‘nd tested
apparatus embodying the> invention` in ' which
afreciprocating’gpump has been »usedfand-f'have 45
found that the‘system will "operate, ‘but-“with
pressure dropl between» successivel pump ïstrolàes
intermittentv spilling ofthe injector takes v'place
even ' though "injector -'operation' ' continues'. ‘ Such
spilling is'of course undesirable. A relatively con 50
stantfpressure 'which is easily obtained by a ro
tary" pum'pf. particularly Á- a centrifugal `pum-p',
makes " ¿this yform 'of"fpiimp- most' -de'sirab-le.-A l In
emerito 'secure‘themaximum benefit from appa
ratus-f? embodying? the inventionë lit> f is"V desirable
to employ a relatively high delivery-pressure
from the pump, which pressure may convenient
Iy ' béhre'ferred tcl as"ïbooster - pressure."y To obtain
th‘is'fpressure'fiiveïsteamlis useejfor `operatingthe
pump but Atl'fe ¿live steam »used l‘forïïth'e'pump' does
notrepres’entïa‘n'etïloss as compared with 'other
exhau'st'îsteam injector systems-‘since with other
exhaust Ãstearnï injector 'systems' it is"necessa‘r"y;
when ' feeding? to‘lhighfpressure boilers,` to supple
ment the’action ofthe-exhaust steam Withvtha't
of live steainïwhichin‘îprior Isystems hasV been' in
troduced eitherftotheisame condensing zone of
the rat'ëíof feedofwater to the injector.'¿ With a
construction such as thatshownßfinïwhich the
the'` injector as'f‘that to which exhaust steamV is
vice versa.;`r VBy’refere‘r'ice' to’Figs. 2 and `3,‘ it will
suen- prës‘s??èïresiuts in nettnermai gain' if high
sup'pliedor has'beenfused’to operate a separate
Fpressure injector`> stage to which' water has
area ’fior/f How YofV
.tolthem inj actor> through Yhigh
supplied by a low pressurev exhaust steam
'the' shower' nozzle isV4 fixed', ' it will be 'evident' that stag'efgÈWe
have' found vthat the improved injec
Äthe’pressure inthe "delivery
yfrom jthe
tor "actionv accompanying high booster pressure
with _the
_great l' he‘fpressurefand
and“ high five" f ' by Éof» entry "of the water 'due-to
2,105,817 f
booster pressurev is used even though to obtain
such high booster pressure requires the use> of
more live steam than would be required for a
lower booster pressure.
In order to illustrate how we consider it .best
to secure maximum benefit from a system em
bodying the present invention, we give below the
following example, which is to be taken as illus
trative only, and not in any way limiting.
Let it be assumed that the boiler feeding sys
tern is to provide feed water for a boiler designed
tooperate at 300 pounds per square inch and that
the desired capacity range of the system is from
a minimum of 24000 pounds of water per hour to
Further, let it
15 40000 pounds of water per hour.
be assumed that the system must be capable of
feeding water through a reasonable capacity
range, which may not necessarily be the maxi
mum capacity range, with water supplied to the
20 system Vat a temperature as high as 90° F. Under
these assumed conditions, the shower nozzle of
the injector should be constructed withV an ‘area
for flow of water which is o-f the order of 0.1228
square inch and the pumpr should be designed
25 so that the booster pressure may be varied from
a minimum of 107 pounds per square inch to a
maximum of as high as 300 pounds per square
inch for capacity operation 'of the'injector. By
having a pump capable of delivering against pres
30 sure of this order, itis possible to maintain rela
tively high capacity range and in the upper ca
pacity range it is possible to continue 'to feed
water to the boiler and to condense therewith
sufñcient -exhaust steamto give ‘a high‘delivery
35 temperature, even when the water supply is at
relatively high temperature.
To illustrate, in other Words, what we consider
it desirable to lattain in a system embodying the
invention, it may be said that the water nozzle
chamber to said condensing zone through said .
space in the same direction as that of the steam
delivered from said main steam nozzle.
3. In the operation of a boiler feeding ysystem
having an exhaust steam injector with a water
inlet of fixed area and a pump for delivering
water tol said inlet, the improved method which
consists in feeding water through said inlet at
high velocity to the condensing zone of the in
jector, due to pressure from said pump, condens
ing with said water exhaust steam delivered at v
high velocity to establish a forcing jet raising
the temperature of said jet by condensing there
with a secondary jet of exhaust steam, control
ling the capacity of the system by varying the
pressure at which water is delivered to the in
jector, and controlling the amount of steam sup
plied by said secondary jet in accordance with
variations in pressure lat which water- is delivered
to the injector.
4. In Ya boiler feeding system, the combina
tion with a pump for delivering water at high
pressure,.of an exhaust steam injector having
a water chamber in communication with the de
livery of the pump, a main steam nozzle and a 25
shower nozzle interposed between said water
chamber and the delivery end of said steam
nozzle forY delivering water to the condensing
zone of the injector at high velocity, said shower
nozzle having a fixed cross sectional area deter
atwhich Water is delivered by the system.
‘5.*In a boiler feeding system, the combination ‘
with a pump for delivering water at high pres
sure, of an exhaust steam injector receiving wa
ter from said pump, said injector having a main
steam nozzle, a water chamber around said'nozzle
40 construction and the‘pump providing the booster
and in communication with the pump, means co
pressure should be so related that the velocity of
entry of Water to the condensing zone of the in
jector is maintained within a range of values of
which the lower limit is of the order of l126 feet
45 per second and in which the upper limit' is of
operating with the outlet end of said nozzle to
the order of 210 feet per second.
While in compliance with the patent statutes,
we have illustrated one embodiment of apparatus
suitable for' carrying the invention into effect,
50 it is to be understood that the scope of the in
vention is to be considered as embracing all va
riations in mode of operation 'and forms of'ap
paratus employed which may fall within the scope
of the appended claims when they are considered
55 as broadly as is consistent' with the state of the
prior art.
We claim:
1. In a boiler feeding system, an exhaust steam
injector, and a pump for supplying water under
form an annular passage for flow of water into
tween said water chamber and outlet end of the i
nozzle having a plurality of slots therethrough
formed and disposed to direct the flow of water
at high velocity >in a plurality of separate
streams intorsaid annular >passage in the same
general direction as that of the steam delivered
from said nozzle, the total cross sectional area of
said slots being less than the cross sectional area
of said annular passage, and means for varying
the delivery pressure of the pump to control the
rate at Awhich water isV delivered by the system.
6. In a boiler feeding system, an exhaust steam
injector of the forcing type adapted to deliver
Water at substantially higher pressure than that
at which Water> is admitted to the injector, said
injector having a water nozzle of fixed cross sec
water nozzle providing a plurality' of passages
disposed to introduce anddirect the water sup
plied to the condensing zone of the injector at
high velocity in a plurality 'of 'separate streams
65 in -the same general‘direction' as Vthat ‘of >the
tional area, a conduit connecting `the delivery
end of the injector with a boiler, means for sup
plyingvthe injector with exhaust steam from an
engine vand with low pressure live steam from
the- boiler when exhaust steam is not available,
2. In a boiler feeding
an Y exhaust
steam injector having an annular main steam
nozzle and a water nozzle surrounding a' portion
70 _of the steam nozzle to provide between said noz
zles an annular space for ñow of the water sup
plied to the condensing zone of the injector, a wa
ter admission chamber-,and means providing a
plurality of separate passages disposed to intro
76 duce and direct the flow ofgwater from said water
contact with steam emerging from said nozzle,
means fixed in the injector around the nozzle be
60 pressure to the injector, said injector having `a
stream entering said condensing zone.>
mining the rate of flow of water to the combin
ing zone of the injector, and means for varying
the pump delivery pressure to control the rate
andl means for supplying waterto the injector
at different rates and at different pressures in
accordancecwith the .requirements of the boiler
for feed water.
'7. In a‘boiler feeding system, a mechanical 70
pump,-a conduit for supplying to the pump boiler
feed-»Water- from a source external of the boiler,
Van_¿exhaustfsteamfinjector of the forcing type
separate from the pump andvhaving steam and
water nozzles and an overflow,` a conduit for sup
plying water from the pump to the Water nozzle
of the injector at a pressure substantially above
exhaust steam pressure but below boiler pres
sure, a conduit for supplying exhaust steam from
an engine to a steam nozzle of the injector and a
conduit for delivering Water from the injector to
the boiler.
8. In a boiler feeding system, a mechanical
pump, a conduit for supplying to the pump boiler
10 feed water from a source external of the boiler,
an exhaust steam injector of the forcing type sep
arate from the pump and having steam and wa
ter nozzles and an overflow, a conduit for sup
plying water under pressure from the pump to
15 the Water nozzle of the injector at a pressure
substantially above exhaust steam pressure but
below boiler pressure, a conduit for supplying
exhaust steam from an engine to a steam nozzle
of the injector, means for delivering low pres
20 sure live steam to the injector for operating the
same When exhaust steam is not available and a
conduit for delivering Water from the injector
to the boiler.
9. In a boiler feeding system, an exhaust steam
25 injector having a Water nozzle, a main steam
nozzle and a secondary steam nozzle, a pump
for supplying Water under pressure to the water
nozzle, means for supplying exhaust steam from
an engine to said steam nozzles and means re
30 sponsive to variations in the rate at which Water
is supplied by said pump for varying the area of
the opening of the secondary steam nozzle.
l0. In a boiler feeding system, an exhaust
injector of the forcing type having a Water noz
35 zle of iixed area, a main steam nozzle and a
secondary steam nozzle, a pump for supplying
boiler feed Water under pressure to said Water
nozzle, means for controlling the rate of op-eration of said pump to regulate the amount of
40 feed Water supplied to the boiler, means for sup
plying exhaust steam from an engine to said
steam nozzles and pressure responsive means for
varying the area of the opening of said secondary
steam nozzle in response to variations in the
45 pressure at which Water is supplied to the Water
nozzle by said pump.
11. In a boiler feeding system, a mechanical
feed Water pump, means for supplying said pump
with feed water from a source external of the
50 boiler, an exhaust steam injector of the forcing
type, means for supplying said injector With ex
haust steam from an engine, means for conduct
ing feed Water under pressure from the delivery
side of said pump to said injector, means for
55 controlling the rate at which Water is delivered
by said pump to regulate the supply of feed Wa
ter to the boiler, means responsive to the rate
at which feed Water is supplied by the pump to
the injector for automatically regulating the
60 supply of exhaust steam to the injector and
means for conducting the water delivered by the
injector to the boiler.
12. In a boiler feeding system, an exhaust
steam injector of the forcing type having a water
nozzle of fixed cross-sectional area, said injector
being connected to deliver feed Water to the
boiler, a mechanical pump, means for supplying
said pump with cold feed Water from a pressure
free source of supply, said pump delivering un
heated feed Water to said nozzle at a pressure sub
stantially above atmospheric but materially be
loW boiler pressure, and means [or controlling 10
the speed of operation of said pump `for regulating
the quantity of feed Water supplied to the boiler
by said injector.
13. In the operation of a boiler feeding system
having an exhaust steam injector of the forcing 15
type delivering water to the boiler, the improved
method which consists in elevating the pressure
of cold boiler feed Water from a pressure free
source Without materially increasing the tem
perature of the water, forcing the feed Water at 20
its elevated pressure at high velocity to the con
densing zone of the injector through a plurality
of openings of fixed cross-sectional> area, and
controlling the capacity of the injector by Vary
ing the pressure at which the water is supplied to 25
such openings.
14. In a boiler feeding system, an exhaust
steam injector of the forcing type having a Water
inlet of ñxed area, means for feeding Water
through said inlet at high velocity to the condens 30
ing zone of the injector comprising a pump for
delivering water to said inlet under a substantial
pressure, said injector having means for condens
ing a ñrst exhaust steam supply With the water
delivered at high velocity to the injector to es
tablish a forcinrr jet and means for condensing
a secondary exhaust steam supply to elevate the
temperature of said jet, and means for varying
the pressure at which water is delivered to said
inlet to control the capacity of said injector.
l5. In a boiler feeding system, an exhaust
steam injector of the forcing type having a water
inlet of ñxed area, means for delivering cold feed
Water to said inlet at high velocity comprising a
mechanical feed water pump for delivering un
heated feed Water to said inleiJ under substantial
pressure, said injector including means for con
densing a ñrst exhaust steam supply with the
Water deliveredrat high velocity to the injector
to establish a forcing jet and means for condens
ing a secondary exhaust steam supply to increase
the temperature of said jet, means for controlling
the pressure at which water is delivered to the
injector to regulate the capacity of the system,
and means for controlling the amount of said 55
secondary supply of steam in accordance With
variations in pressure at which the Water is de
livered by the pump to the injector.
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