вход по аккаунту


Патент USA US2404516

код для вставки
July 23, 1946.
' '
Original Filed‘July 3, 1941
2 Sheets-Sheet 1
July 23, 1946.
. opgginar Filéd July 5, 1941
2_Sheets--Sheet 2
Patented July 23,1946
’ , ' UNITED
Frank W. Miller, Chicago, Ill., assignor to Fran
clare Company, Chicago, Ill., a corporation of
Original application July 3, 1941, Serial No.
400,932. Divided and this application Febru
ary 3, 1943, Serial No. 474,540
3 Claims. (01. 122-382)
1 1
in Fig. 2, a suitable bracket or other support 6
carries the blow-off line ‘I, the re?ll water line
This invention relates to the treatment of steam
boilers for the purpose of relieving them of the
scale and sludge which accumulates therein dur
8, the live steam line 9 comiected to be supplied
with steam from the powerhouse boilers, and,in
many instances, a washout water line, which in
the present instance is not shown.
ing their operation.
The method most commonly employed in
cleaning boilers is to blow off the steam and water,
drain out any remaining water, and then wash
the boiler by delivering jets of wash-out water
at various angles and at various locations into
For the purpose of superheating the re?ll Wa
ter to be delivered to a boiler being treated, a
water superheater or heat booster of the char,
the boiler, in an endeavor to loosen and knock 10 acter illustrated in Fig. 3 is preferably employed.
Such a booster comprises "a cylindrical casing ll
oil.’ the accumulated scale and force the sludge
provided intermediate its ends with a Venturi
and other solid material toward the drain open
tube [2 disposed in alignment with a water dee
ing through which it is discharged.
livery nozzle I3 having a ?ange l4 clamped to the
The opening up of therboiler to atmosphere
after the steam and water have been discharged 15 upper end of the casing H by supportingbolts
I5 and IS. The inlet end of the nozzle is con
results in a rapid drying and caking of the ob
nected .by a pipe H with the re?ll water line 8,
jectionable solid matter which it is desirable to re
and in the pipe vl‘l is interposed a check valve
move'from the boiler. This drying and caking is
18 and a shut-off valve l9. The superheater may
increased by the heat existent in the, crown sheet
and tubes, with the result that the encrusted solid 20 be mounted at any desirable height above the
floor, but when mounted sufficiently high to be
matter adheres with such. tenaciousness to the
out of the way of workmen around the pits, as
boiler surfaces that its removal by the jets of
washing water is rendered impossible.
One of the purposes of my present invention is
to preclude this drying and caking of the solid
matter upon the boiler surfaces and to remove
the matter from the surfaces while in a soft and
uncaked condition. With this end in view, my in
vention contemplates the internal washing of the
boiler with jets of high pressure water while some
water and substantial steam pressure remain in
the boiler, so that the atmosphere is excluded
from the boiler and all the surfaces remain in
a wet condition, which is most conducive to the
removal of the sludge and solid matter therefrom.
To facilitate an understanding of my inven
tion, I have illustrated on the accompanying
illustrated in Fig. 2, the valve I9 is equipped with a
an operating lever 2| adapted to be operated
26 through the intermediary or pull chains 22 and,23.
A pipe 24 is connected at one end with the
casing ll above the Venturi tube l2, so as to com
municate with the valve 25‘su1‘rounding the noz
zle l3 and receives its steam supply from the
80 steam line 9. The pipe 24 is preferably equipped
with a shut-off valve 26 and with a regulating
‘valve 21 by which the amount of steam delivered
to the superheater may be regulated. This valve
also, when located at an inaccessible height, is
equipped with operating pull chains 28.
A branch 29 leading from the casing H below
the Venturi is connected by a pipe 3| with the
blow-o? line 1, and this pipe is also equipped with
drawings as an exempli?cation one form of appa
a check valve .32 and a shut-off valve 33 adapted
ratus by which my improved method may be
40 to be operated by lever 34 to which are connected
carried out.
operating pull chains 35 and 36,.
Referring to the drawings,
i A ?exible conduit in the form of a hose or a
Fig. 1 is a schematic view of an apparatus by
pipe 31 provided with ?exible joints 38 is equipped
which my invention may be practiced;
at its free end with a coupling wrench 39 by
Fig. 2 is a view showing the arrangement em
45 which the conduit may be connected with the
ployed at one of the drops;
blow-off cook or the washout plugs of 'a locomo-v
Fig. 3 is a longitudinal sectional view through
tive boiler.
the water superheater shown in Fig. 2; and
Referring to the schematic layout of Figure 1,
Fig. 4 is a fragmentary detail of one of the
it will be apparent thatthe steam line 9, the
adjustable nozzles.
Referring to the drawings more in detail, ref 60 blow-off line 1 and the re?ll line 8 may be con
erence character 5 indicates generally a locomo
tive stationed at a pit in a roundhouse between
- nected with the locomotive boiler through the
common conduit 31 at will. The various connec
tions are established as desired through manipu
two adjacent drops. The apparatus at each drop
lation of the valves 33, I3 and 21. From this
in the roundhouse is preferably ‘of the character
disclosed in my Patent No. 2,260,857.v As shown 5.5 ‘?gure it will be apparent that the blowv-o? line '
" IT
is adapted to deliver into a steam separator 4|v
ously stated, is then further heated by steam from
by which the blow-off steam and water are sepa
rated. This separator is preferably of the cen
trifugal type from which the blow-01f water is
the line ‘I delivered through valve 21 until the
' temperature of the high pressure water, When
delivered to the boiler is only slightly below the
discharged through a pipe line 42 either to a waste. 5 temperature of the boiler under the pressure ex
conduit or preferably to a storage tank where the
istent therein. Because of this slightly lower
water is stored for boiler washout and other use
ful purposes.
temperature, the delivered ‘water doesnot ?ash
The sludge accumulated in the. .. into steam but is delivered as a solid high pres-'
separator may be discharged to waste at suitable‘ ‘ ‘ sure jet against various interior surfaces of the
intervals through a discharge pipe 43 controlled 10 boiler so as to remove the sludge, scale and other
by a valve 44. The steam from the separator is ,
conducted through a line 45 to a condenser 46,,
preferably of the open type through which water‘
is circulated to condense the steam.
solid matter which has accumulated on these
Since the boiler still contains water
and steam and has not been opened to atmos
phere as has heretofore been customary, no op
- ' surfaces.
This con
densing water is taken from the re?ll storage tank‘ 15
4'! and delivered by a pump 48 through the line
49 to the condenser, from which it is returned
through the line 5| into the re?ll storage tank.
Additional water is supplied to the tank as re-'
quired through a fresh water supply pipe 52. The 20
details, not shown, of the condensing system may
be of the general type disclosed in my prior Patent
portunity has been afforded for the accumulated
solid matter to become caked upon the boiler sur
faces, consequently, it is in a somewhat soft and
non-adherent condition which is conducive to its.
removal from the boiler surfaces. The main
tenance of the boiler in hot condition and the
delivery of hot washing water also contribute
toward the freeing of the solid matter from the
No. 2,135,407, issued November ,1, 1938. Re?ll
boiler surfaces, so that greatly superior results
water is delivered tolthe re?ll line 8 from the
are attained than are possible with the usual prac
storage tank‘ 4'! by means of a pump 53 in the
25 tice where the boiler is permitted to cool down
and is washed with relatively cool water.
In practicing my improved method of treating
After the washing of the interior of the boiler
boilers, the system above described is utilized in
with high pressure high temperature water has’ '
the following manner:
been partially completed, the blowing off opera
IA locomotive to be treated ‘is positioned on a 30 tion is again, resumed by opening the left-hand,
pit between two drops and thelefthand drop, for
valve 33' (viewing Fig. 1) so that the solid matter
which has been washed off of the boiler surfaces
through the conduit 37 which is attached to the
will be blown out of the boiler along with the
blow-off cock of the locomotive._ Valves I9 and
blow-off water and deposited in the separator 4 I,
2‘! are closed and valve 33 is vopened, thereby per 35 from which it may be discharged as previously
mitting the boiler contents to be blown off through
explained. The washing of the boiler with'hot
the blow-off line 1, the steam and water being
high pressure Water may be continued during the
separated by the separator 4!, the blow-oil" water
?nal, blowing oif operation, with the result that
being thrown away or conserved, as preferred,-v
when the boiler has been completely emptied it is
instance, viewing Fig. l 1 is connected thereto
1 and the steam being condensed and stored in the
re?ll‘ storage tank.
Instead of blowing off all of the water and ,
steam from the boiler, then opening ‘up the boiler
‘ and ‘washing it out as hasheretofore been cus- ,.
' 'tomary, my invention contemplates interrupting '
the blowing off operation when about two-thirds
" of‘the ‘water has been blown off and about 100
pounds steam pressure remains in the boiler.
‘ Thisinterruption is effected vby closing the valve .
substantially free from the accumulated solid
matter, and, unless repairwork is required, it
may be immediately re?lled without being opened
up to atmosphere'or unduly cooled down. Even
when washed in'accordance with my method,
without being opened. to' atmosphere, the tem
perature of the boiler is materiallyreduced below
the normal working temperature, so that’ some
contraction of the ‘boiler hasv occurred, ,The
amount of contraction, however, is relatively
1 33. ‘Thereupon'the conduit 37; is connected with 50 small as. compared with that encountered in the
}_ the boiler for washing purposes. The ‘connection
' ordinary practice of washing boilers, and, since
1 is'made successively to the various washout plugs,
the boiler has remained under steam pressure
somegof which are customarily equipped with
nozzles disposed inside ‘the boiler and adapted to ,
during, practically the entire washing operation,
‘ 2, cleaning jet of waterzin various directions with
such contraction as does occur ‘is, uniform» and
does not impose injurious strains and stresses up
1 in the, boiler.
procedure.' in; accordance
' _, /
1 be turned tovarious positions so as to discharge
A typical nozzle for this purpose
‘ is indicated by reference character 53 in Fig. 4. ‘
This nozzle is rotatably 'mountedln the plug 514
with my methodwill be understood from the force‘
going, and that the advantages resulting ;from
60 the practice of this method ‘will be appreciated,
all without further description. Variations in‘ the
rection, of discharge therefrom’is effected by
hereinabove described as illustrativea-nd
means of theihandle 5t. When the connection
toa washout plug, has been established, at the .7 wide modi?cation in the apparatus employedjin
righthand .side of?the boiler, for instance, valve 65 practicing the method may obviouslybe resorted
to Within the scope of the invention as :de?ne‘d'in
33 is left closed, valve 19 is opened, and valve 2'!
‘ and connected by a swiveljoint 55-wi'th the con
‘ duit 31. Rotation of the nozzle to vary the di
‘ is also opened or partially opened so ‘as to heat
‘ the delivered water to 250° or more. ' The water
1 in the re?ll line, 8 .isd'elivered by a suitable pump
at 150 to 200 pounds'pressure, which is materially
‘ higher than the pressure existent in the boiler.
1 This water has beenvpreviously heated by waste
1 products from the boiler washing system and ex
,haust steam from’. the power "boilers to a tem- .
the following claims.
, t
_ This application is a division of my co-pending
application Serial No, 400,932,.?led July 3,3,;1941
and which 7 has matured?intol 'PatentQNumber
2,318,247, May 4, 1943;
v Iclaim;
‘1.1 The method of cleaning
sists in partially 'Vblowing down a ‘boiler leaving
therein about OHS-thll‘diOfltS :normal liquidcoll
perature approaching‘200", and, as has been previ 75 tents under a substantial steam pressure, loosen
ing and removing accumulated solid matter from
the boiler without permitting contact of the at
mosphere therewith by delivering into said boiler
boiler pressure and at a. temperature only slightly
below the temperature existent in the boiler, and
thereafter blowing off the remaining water to
against the accumulated matter water at a pres
gether with the solid matter loosened by the ac- '
sure above and at a temperature below the pres
tion of said jet.
sure and temperature of the boiler, and blowing
o? the thus loosened solid matter together with
the Water remaining in the boiler.
2. The method of cleaning steam boilers while
under steam pressure which consists in partially
blowing off the steam and water in the boiler until
approximately one-third of thevnormal amount of
liquid remains therein under substantial steam
pressure, delivering into said boiler against the
solid matter to be removed therefrom a jet of
water under pressure greater‘than the existent
3. The method of cleaning boilers which con
sists in blowing oif about two-thirds of the liquid
contents of the boiler, delivering into said boiler
containing a substantial water level under sub
stantia1 steam pressure, jets of water at a slightly
lower temperature than the boiler temperature,
directing said jets toward the surfaces to be
cleaned, and blowing off the thus ‘dislodged solid
matter together with the remaining ?uid contents
of the boiler.
Без категории
Размер файла
514 Кб
Пожаловаться на содержимое документа