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Патент USA US2116601

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May 10, 1938‘
. M. FRISCH Y
2,116,601 _
PULVER‘IZI'NG SYSTEM
Filed Dec. 29, 1955
.2 Sheets-Sheet 1
l NVENTOR
MAW/v FQ/JCH
BY
ATTQRNEY
May 10, 1938. >
M_ FR|$¢H
I
'
2,116,601
PULYERIZING SYSTEM
Filed Dec. 29, 1955
2 Sheets-Sheet 2
5%
l NVE NTO R
M41977” fk/JC/i
BY
2,116,601
Patented May 10, 1938
UNITED STATES PATENT ‘OFFICE
2,116,601
rULvEmziNG srsreiu
Martin Frisch, New York, N. Y., assignor to Foster
_ Wheeler Corporation, New York, N. Y., a- cor
'
‘ poration of New York
Application December 29,1933, Serial No. 704,453
16 Claims.
(01. 11o-‘-1o4)_
'
Fig. 3 is a sectional view taken on line 3-3
This invention relates to pulverizing systems
and more particularly pertains to systems for
of Fig. 1.
_ ,
Like characters of reference refer to like parts
pulverizing fuel such-as coal, and feeding‘ the
throughout the several views.
fuel to a furnace or other place where. combus
5' tion of the fuel will occur.
.
Referring to the drawings, particularly Fig. 1,
reference letter “A” indicates generally a ball
mill pulverizer comprising a cylindrical shell in
rotatable about a horizontal axis, which contains
the material to be pulverized and grinding or
pulverizing balls of various desired sizes. The 10
material to be pulverized is introduced into the
mixture is combustible and under certain condi
tions explosive and in the event the velocity of mill through a feed conduit II and through
trunnion l2., The material from the feed con
the air and fuel mixture moving from the'pul
ven‘zing means ,to the furnace is materially re-, duit ll drops into‘ a conveyor conduit l3 and is 15
15 duced below a normally safe velocity for any‘ introduced into the shell 10 by means of a helical
reason, such as theystop'ping or breakage of the conveyor “connected to‘the §he1l ill by con
exhauster fan or the pluggin of the burners or nection I5 for rotation by the shell. Air in will
the fuel‘ conduit, combustio and under certain cient quantity ‘and at the proper temperature is
conditions, an explosion in the conduit or'pul "introduced into the shell through an air‘ duct l6
2° verizing means or both is likely to occur due to and trunnion H. The pulverized material is 20
In systems of this characterrthe fuel after pul-.
verization, is ordinarily carried by a current of
air moving through a conduit directly to a fur
nace where combustion takes place, rather than
10 to-a storage bin. The pulverized fuel and‘ air
the propagation of ?ames from the furnace to
picked up by the air current ?owing through the
mill and is-carried through trunnion l2 into a
The present invention provides novel means for classifier I8 where the desired classification of
avoiding the propagation of ?ames to a pulverizer . the fine- and coarser particles of the material‘
25 from a‘ furnace or burner served by it. In general, 4 takes place. The coarser particles are separated 25
the pulverizer.
.
such means comprises one or more devices which
respond to the pressure conditions existing in the
system and which serve to operate,‘ when the pres
sure conditions in the system approach or. reach
from the finer particles and the former drop
down into the conveyor conduit i3 and are re
turned to the‘mill through trunnion l2 by the
conveyor M. The material which has been pul
30 the point where an'explosion is likely to occur, ’ verized to the desired extent is carried by the‘ 30
means_for closing the conduit connecting the pul-' air current through the feed conduit l9 to the
verizer and furnace and for scavenging withv clear point of use. ' It willfbe understood that the par
air the exhauster and the conduit between the ticular type of pulverizing equipment or appara
conduit closing means and the furnace, thus sub ' tus disclosed herein is not essential to the carry
ingout of the invention. Other forms or types 35
35 stituting a non-combustible atmosphere incapa
ble of propagating ?ame for the combustible fuel of pulverizingapparatus may be employed, if
mixture in said conduit and exhauster by the desired.
The invention as disclosed is applied particu
operation of the'pressure responsive devices.‘ In ‘the particular embodiments of the invention dis-' larly to the pulverization of'co'al and the feeding
40 closed in this application, the devices which re
spond to the pressure conditions in the system
control a ?uid pressure actuated device which in
thereof to one or more burners in a furnace for 40
?ring a boiler or still or the like. The pulverized
coal is drawn from the mill through the classi?er
turn operates the ‘conduit closing means ‘and. ‘ l8 and the feed conduit l9 by an'exhauster fan
20 of any suitable type or kind. Fan 20 is mount
permits clear air to be introduced into the con
‘5 duit. In one form of the invention, the ?uid ed in the feed conduit l9 and is driven or ro 45
pressure actuated device will operate the con-_ tated by any suitable means such as the electric
duit closing means to close the conduitwhen the motor 2| indicated. Fan 20 draws the air and
pressure of the actuating ?uid fails for any the} pulverized coal carried thereby from the mill‘
and forces it through thefeeding conduit l9 into
reason.
'
'7
“
;
one or more burners 22 in a furnace 23. Air'yis 50
The nature of the invention will be clearly supplied to thelburners 22 through an air con
understood from the following description con
sidered in connection with the accompanying
. drawings forming a part thereof and in which: '
55
Fig. 1 is a more or less diagrammatic view in
duit 24.
'
As shown, on the suction side of the exhauster
fan 20, feed conduit 19 is provided with an air
opening 25 which is adapted to be closed by a 55
elevational section of .pulverlzing and. feeding
damper 26 secured as shown, at one end thereof '
equipment embodying
to‘ an oscillatable shaft 21 so as to provide for‘
invention;
one form of the present
“
Fig. 2 is a view similar to Fig.‘ 1 showing an
.0 other form of the invention, and
. the movement of the damper into a position to‘
entirely or to substantially entirely close the feed
‘ - conduit l9_ and to open the conduit to the atmos
2
2,116,601
air'may be drawn in through the opening 25 by
acter which is connected to the'damper 26 to
operate the same and thereby move ‘the damper
the fan and forced into the burners 22 and fur
nace 23. Damper 26 is provided with an operat
close the feed conduit l9, at such times as the
- ing lever 28 which is secured at one end to the
pressure‘conditions in the systemrfall belowithel
shaft 21 and which is disposed outside of the feed
conduit I9. A counter-weight 29 (is mounted on
predetermined‘ minimum: 'As shown in(Fig. 1,
phere or other source of clear air, so that fresh
the end of a counter-weight arm 30 which is se
cured to the shaft 21.
to closed position, or to a position wherein it will
the pressure actuated device consists of a cylinder
6|] and a’ piston 6| movable therein.~ Piston rod
The damper 26 during‘ 62 is connected at its outer end to a hand wheel
10 operation of the pulverizing system is normally
or other adjusting device 63- which in turn is con
in the position shown in Fig. 1, that is to say, so
that the feed conduit I9 is entirely open and the
nected through a link 64 to the damper operating
lever 28. The adjusting device 63 serves to ad,
opening 25 is completely closed. However, it
will be understood that the damper 26'may be
15 utilized as a capacity controlling device by caus
just the position of the damper 26 with respect
to the piston 6| so that the damper maybegmain
tained either in fully open position as shown in
ing it to assume any position intermediate its
fully open position shown in Fig. 1 and its fully
Fig. l, or in any intermediate position between its
fully open and fully closed, positions so that it
closed position wherein it entirely cuts o? the
will serve as a capacity control device in addition
to a cut-out or cut-o? device. Any suitable fluid
such as oil, steam, air or gas is supplied to the 20
feed conduit I9.
Means responsive to the pressure conditions
20
existing in the pulverizing system, or more spe
Ci?cally pressure conditions existing in the feed
conduit I9, are utilized for operating the damper
26 at such times as it'becomes necessary to cut
25 o? the mill from the fan and furnace to prevent
the propagation of ?ames back from the furnace
to the mill with resultant danger of an explosion
in the mill;
As shown in Fig. 1, such means con
sists of a pressure responsive device, indicated
30 generally “B” which is responsive to pressure con
ditions existing at spaced points between the fan
I and the furnace and a pressure responsive device
indicated generally “C” which is responsive to the
pressures developed by the exhauster 26 on ‘its
' suction and pressure sides._ Pressure responsive
device “B” as shown consists of a cylindrical cas
ing 4| having a centrally disposed cylindrical re
cess 42in its lower portion thereby providing a
Zcasing having a cross-section in the form of "an
40 inverted U. Casing 4| is partly ?lled with a liq
uid such as mercury, which serves 'to'support .a
bell ?oat 43 in the casing. Bell, ?oat 43 divides
casing 4| into a lower chamber 44 and an upper
chamber 45.
cylinder 60 through a pipe 65 connected to the
source of ?uid pressure. As shown, pipe 65 is
connected with the right hand end of cylinder
66 as viewed in Fig. 1. This pipe is provided
with a valve'66 and with a branch pipe 61 con
25
trolled by a valve 68, through which pipe ?uid is
exhausted from cylinder'60 when damper 26 is
moved to conduit closing position by piston 6|.
A pipe 69 is connected at one end 10 to the pipe
65 and at its other end to the left hand end of 30
cylinder 60, as viewed in Fig. 1. Pipe 69 is pro
vided with a piston valve 1|, the piston 12 of
which is connected through a-link 13 to the outer
end of lever 52 which is actuated by'the bell ?oat
43 in pressure responsive device “B”." As shown 35
pipe 69 is also provided with a valve 14 inter
mediate the valve H and pipe 65 and is further
provided with a branch pipe 15 controlled by
valve 16 adjacent the end of pipe 69 which is con
nected to the cylinder 69. Pipe 15 conducts to 40
the atmosphere any leakage past valves 1| and 19
and ?uid is exhausted through this pipe from
cylinder 60 when the apparatus is reset, or when
The lower chamber 44 is connected
the damper 26 is returned to the position in
which the» conduit I9 is fully open, as shown in
with the feed conduit I9 at a point 48 adjacent Fig. I. _ A pipe 11 is connected‘ at one end 18 to
the pressure side of exhauster fan 20. Theupper ‘ pipe 65 and at the other end to the pipe 69 and is
45 by a tube 46 to a tube 41 which communicates
chamber 45 is connected to the feed conduit l9 controlled by a piston valve 19, the piston 89 of
at a point 49 adjacent the furnace‘23 by the tube which is connected through a link 8| to the outer
50 v5|l. Bell ?oat 43 is connected by a rod 5| secured . end of lever 52’ which is connected to bell ?oat 60
thereto, to the intermediate portion of a lever 43’ of pressure responsive device “0". Pipe 11
52 pivoted at onev end 53 to the casing 4|. A . also has a suitable valve 11' disposed interme
weight 54 is adjustably mounted on the lever 52 diate the valve 19'and pipe 65.
..
adjacent the other end so as to urgethe bell ?oat
55 downwardly as viewed in Fig. 1. The pressure
The operation is as follows: Upon the occur
rence of an accident such as, the plugging up of 55
responsive device “C”'is similar in all respects to the burners 22 or of the feed conduit | 9 or of
the. pressure responsive device “1311, so that it is the mill or of any accident causing a reduction
deemed unnecessary to describe device “0” in in velocity of ?ow of air and fuel through the
detail. The parts thereof are designated by the conduit l9 .to a dangerous degree, the difference
same reference characters which designate the in pressure between points 48 and 49 in conduit 60
corresponding parts of the pressure responsive de- _ l9 will be varied so that a greater pressure than
vice “B” but with the addition of a prime to each ‘normal will exist at-point 49 or a lesser pressure
than normal will exist at point 48, or both, as
character. Chamber 44’ of device “C” is ._con
nected to point 48 in the feed conduit l9 by pipes a result of which bell ?oat 43 will be moved down
65 55 and 41. Chamber 45' of device “C” is in com--.
wardly as seen in Fig. 1, under the‘ action of 65
munication with a point 56 adjacent the suction weight 54 and will move piston 12‘ in valve 1|
side of the exhauster fan 29 through a tube 51. downwardly, thereby opening the valve and per
- It will be ‘understood that any suitable form of mitting the ?uid under pressure from pipe 65 to
enter the left hand end of cylinder 60. It will be
of the ?oating bell device shown in Fig. 1. Such understood that during normal operation of the 70
other devices may be of the diaphragm, sylphon, ‘ system the damper 26 will be either fully closed
with respect to the conduit or in a position inter
piston or other suitable types.
In the form of the invention shown in Fig. 1, mediate its fully open and fully/closed positions
pressure responsive devices “B” and “C” control with respect to the conduit and piston 6| will be
near the left hand end of the cylinder as viewed 15
75 a pressure actuated device of any suitable char
A pressure responsive device may be utilized in lieu
3
' 2,110,601
of the[ actuating ?uid and the damper is
in Fig. 1. It will also be understood that during sure
moved
to its closed position with respect to the
normal operation valves 14 and 11’ in pipes 69
and 11 will be open and valve 16 in branch pipe conduit and the conduit is opened to clear air
the pressure fails or is out off from com
15 will be closed and that valve 66 in pipe 65 will when
munication
withjthe pressure actuated device by
be closed and valve 68 in branch pipe 61 will be the operation
of ‘one or both of the pressure re
opened. When ?uid under pressure is admitted
As shown in Fig. 2,. the pres- ‘
to the left hand end of cylinder 68 through pipe sponsive devices.
v
responsive devices “13" and “C” and their
69, piston 6| will be moved toward the right and sure
connections to the pulverizing system, speci?cally
will move damper 26 from its open to its'closed, to the feed conduit l9, are substantially the same 10
as shown in Fig. 1. In the form shown in Fig. 2,
‘cutting off communication between the furnace the damper 26 has its operating lever 28 con
position thereby closing the feed conduit l9 and
and the mill and opening conduit ’ l9 to the
atmosphere or other source of clear air thus pre
venting propagation of ?ames from the furnace
15 to the mill and preventing a possible explosion
in the mill. The movement of the damper to
ward conduit closing position opens opening 25
and permits clear air to be drawn into the con
duit from the atmosphere by the‘fan, if it is
still operating. Upon the occurrence of an acci
dent such as the stalling or stopping of the
means for propelling the exhauster fan, or the
stripping of the blades from the exhauster fan
without stopping the fan, or of a plugging. up of
nected to the piston 82 of thelpressure actuated
device through link 64, adjusting device 63 and
piston rod”. Piston 82 moves in a cylinder 84
and a suitable coil spring 85 is interposed between
the piston and the left hand end 86 of thecylin
d'er so as to normally urge the piston 82 toward
the right, as viewed in Fig. 1, thereby urging the
is
damper toward closed position to close the con
20v
duit. Pipe 81 is connected to a source of fluid
pressure and serves to conduct the actuating ?uid
to the right hand end of cylinder 84. Pipe 8‘! is
provided with a valve 88 and with a branch pipe
25
the exhauster fan, the pressure responsive device 89 controlled by a valve 98. Cylinder Bills pro
vided
with
an
outlet
9|
adjacent
its
left
hand
end.
“C” will be actuated as a result either of an in
crease in pressure at point 56 or a decrease in Pipe 81 is also provided with a piston valve 92,
pressure at" point 48 in conduit i9, or both.‘ Such , the piston 93 of which is connected through its
variations in pressure will cause bell ?oat 43' to rod 94 and through link 13 to lever 52, which is 30
move downwardly, as shown in Fig. 1, which will connected to the bell ?oat ~43 of. pressure respon
sive device “3". Pipe 81. has a pressure release
. move piston 89 of valve 79 downwardly and con
nect. the source of ?uid pressure with the'left' pipe 95having one end 96 connected to pipe 81
hand end of cylinder 60 through pipe 69. The‘ at a point adjacent the valve 92, intermediate
admission of ?uid under pressure to the left hand the latter and cylinder 86, and the other end 35
end of cylinder 68 will move piston H to the connected to a passage 95' in valve 92. Aindis
right as previously described and will move the charged through pipe 95 is conducted to the at
damper 26 to closed position to close the conduit
I9. It will be apparent thatthe operation of either
mosphere through pipe 95" controlled by the pis
ton 93. Pipe 81 is also provided with a‘ piston
valve 91, the piston 98 of which is connected
or both will cause the pressure actuated de- “ through its rod 99 and link 8| to lever 52’ which
405 “C”
vice to move the damper to closed position with , is connected to bell ?oat 43’ of pressure respon
respect to the ‘conduit and open the conduit to sive device "0”. ' A‘ pressure release pipe Hill has
one end i?l connected to pipe 81 adjacent valve
clear. air through opening 25'whenever the pres
the pressure responsive device “3” or the device
sure conditions in the system, or more speci?cally . 91, at a point intermediate valve 91 and the cyl
lnder 84, and has the other ‘end connected to a 45
whenever
the pressure conditions in the feed con
45
duit i9, fall below predetermined minimum values. passage l8l ' in valve 91. Air discharged through
pipe ll'H is conducted to the atmosphere through
During normal operation of the sys
a result of any condition which will tend to stop tem the pistons 93 and 98 of valves 92 and 91
tl'li exhauster fan, the momentum of the fan will respectively, will be in the positions shown in
cause it to run sufficiently long after the damper ' Fig. 2 so that pipe 81 is open and the pressure‘
has movedto closed position with respect to the _ release pipes 95 and I88 are closed and valve 88
conduit, so that the conduit 49 becomes scavenged will be open and valve 90 in branch pipe 89 will
and a hon-combustible atmospheric barrier to be closed.‘ Piston .82 will be approximately in the
position indicatedin Fig. 2 in which position the
55 ?ame propagation is introduced between the
damper is in open position or at some position
damper and the furnace in additipn to the bar
intermediate its open and closed position.
rier of the damper itself.
It will be understood that when the,damper is
moved to' closed position to close the conduit as I pipe I80".
To resetthe controlling mechanism, valves ‘ll,
The operation of the form of the invention ‘
‘ll’ and 68 are closedand valves 66 and ‘I6 are _ shown in Fig. 2 is as follows: If for any reason
60 opened. This will cause the ?uid under pres
sure to be‘ admitted to the'right‘ hand end of
cylinder 69 and will move piston 6i toward the
left .to its limit of travel thereby moving the
damper 26 to ‘open position with respect to the
65 conduit. When the piston 6| is returned to its
normal position and valves ‘ll ands" are in their
normally closed positions, as shown in Fig- l,
such as set forth in connection with the, descrip
tion of the form of the invention shown in Fig. 1,
the pressure conditions in the system, more spe
ci?cally in the‘ feed conduit l9, or the pressure
differentials between the points in the conduit l9
to which the devices “B” and -“C’? are connected
fall below the predetermined desired minimums,
either bell ?oat 43in pressure ‘responsive device
valves 66 and 16 are closed and valves ‘I8. 11' and . “B” or bell ?oat 43' in pressure responsive device
68 are again opened. Thereafter valve 16 is
70 slightly opened to permit any leakage past valves
'II and 19 to escape through branch pipe15.
15'
‘'C”, or both, will be moved downwardly thereby
moving downwardly either piston 93 of 1valve 92 70
or piston 98 of valve 91, or both.
The movement ‘
In the form ,of the invention shown in Fig. 2, downwardly/‘of either or both of these pistons
the damper 26 is maintained in its open position will close pipe 81 thereby shutting off the supply
of actuating ?uid‘ under pressure to cylinder 84
with respect to the conduit by a ?uid actuated
device when the latter is subjected to the presr‘ and will open one or both of pressure release 15
4
2,116,601 -
pipes 95 and Hill thereby permitting spring 85
to move piston 82 toward the right as viewed in
Fig. 2 and moving damper 26 to its closed posi
tion so as to cut off communication between the
furnace and the mill and open the conduit to
plying fuel and air to the mill, a conduit con
necting the discharge of the mill with the fur
naceymeans operative to remove pulverized fuel
and air from the mill and deliver it to' the furnace
through the conduit, a damper adapted to close
clear air thus preventing the propagation of the conduit, pressure actuated meansjconnected
?ames back from the furnace to the mill with ~ to the damper constructed and arranged tov nor
possible consequent explosion in the mill. In the mally hold the damper in a position so that the
conduit is‘open, and means responsive to pressure
event pressure responsive device “B” only is actu
ated due to the change in pressure conditions‘in conditions at spaced points in the conduit for
the feed conduit l9, piston 93 only will cut 03
or close pipe 81 so that the ?uid forced from
cylinder 84 by the movement of _ the piston 82
controlling the pressure actuated means to cause
under the action of spring 85 will escape through
spaced points therein changes from'a predeter
15 pressure release pipe 95.
If on the other hand
pressure responsive device “0” only is actuated,
piston 98 only will cut off pipe‘ 81 and the ?uid
forced from cylinder 84 will escape through pres
sure release pipe I08.‘ Fluid from cylinder 84 will
also escape from pipe I00 where both pressure
responsive devices are actuated so as to cause
both pistons 93 and 98 to cut off pipe 81.
' Inorder to reset the control mechanism in the'
10
the latter to move the damper ‘to close the con
duit when the pressure difference between said
mined value. '
'
2. In combination with a furnace for burning
pulverized fuel, a pulverizing mill, means for sup
plying fuel and air to the mill, a conduit con
15
necting the discharge of the mill with the fur‘
nace,‘ means operative to remove pulverized fuel 20
and air from ‘the mill and deliver it to the fur
nace through the conduit, a damper adapted
to‘close'the conduit, pressure actuated means
connected to the damper constructed and ar- '
embodiment shown in ‘Fig. 2, it is merely neces
sary to move pistons 93 and 98 to their upper ranged to normally hold the damper in a position
positions as shown in Fig. 2, to open pipe 81 and so that the conduit is open, and means ,respon- '
close pipes 95 and I88,‘ to permit the'actuating sive to differences in pressure at spaced points in
?uid to again move piston 82 toward the left the conduit for controlling the pressure actuated
‘against the action of spring 85 thereby moving ' means to cause the latter to move the damper to '
the damper 26 back to its fully open or normally close the conduit when the difference in‘ pressure
open ‘operative position with the conduit I9 open between the spaced points in the, conduit falls
and the air opening 25 closed.
'
_ Should it be desired to operate damper 26 man
below a predetermined minimum.
'
3. In combination with a furnace for burning
ually insteadof automatically through the cyl-'
pulverized fuel, a pulverizing mill, means for sup- _
inder 84 and piston 82, pipe 81 may be connected
plying fuel and air to the mill, a conduit con- '.
to a source of air or other ?uid supply under
pressure. With valve 88 i open and valve 98
necting the discharge of the} mill with the fur
nace, an exhauster fan in the conduit for remov
ing pulverized fuel and air from the mill and
closed, damper 26 will be maintained in the posi
' 'tlion shown in Fig, 2 with the conduit l9 fully delivering it to the furnace through the‘conduit, '
a damper adapted to close the conduit, pressure
'40 open and the air opening v25 fully closed. To
actuated means. connected to the damper con
‘ move the damper 26 toa position to close conduit
structed and arranged to normally hold the
.l9 and to open air opening 25, it is merely neces
sary to close valve 88 and to open valve 98, which damper in a position so that the conduit is open,
will result in cutting off the supply of ?uid to and means responsive to differences in pressure
at spaced points in the conduit between the‘ fan
cylinder 84 and permitting the ?uid under pres
sure in the cylinder to escape to the atmosphere and the ‘furnace for controlling the pressure
or to any other convenient place through pipe 89. 7 actuated means to cause the latter to move the
When it is desired to return, the damper to a damper to close the conduit when the difference
_in pressure between said spaced points in the
> position wherein conduit I9 is open and air open
ing 25 is closed, it is merely necessary to close conduit falls below a predetermined minimum;
valve 90 and to open valve 88.
'
4. In combination with a‘ furnace-for burning
. It will thus be seen that I have provided a con-. pulverized fuel, a pulverizing mill, means for sup
trol mechanism forcutting oif communication be- ' plying fuel and air to the mill, a conduit con
tween a furnace and a coal 'pulverizing mill and necting the discharge of the mill with the fur
opening the conduit connecting the mill and fur- ‘ nace, an exhauster fan in- the conduit for re
nace to a source of clear air, at such times as it moving pulverized fuel and air from the mill and
becomes necessary to‘ do so due to any cause
which might result in ?ame propagation from the
delivering it to the furnace through the conduit,
a damper adapted to close ‘the conduit, pressure
furnace to the mill and an explosion in the mill. - actuated means connected to the damper .con
Although the introduction of clear air into the structed and arranged to normally hold the 60
damper in a position so that-the conduit is open, conduit connecting the mill and furnace is desir
and means responsive‘ to differences in- pressure
able when the damper is moved toclosed posi
tion, it ~will be understood that under some_con-' at spaced points in the conduit between the suc- ‘
ditioris, satisfactory operation may be- obtained ' tion and pressure sides of the fan for controlling
without it. Inasmuch as many variations in the
forms,or embodimentsyof the invention herein
disclosed or the several parts thereof may be
made without transcending thev principles of the
invention, it will be understood that no intention
is entertained to limit’the scope of the-invention
the pressure actuated means to cause the latter 65
to move the damper to close the conduit when
the difference in pressure between said spaced
points in the conduit falls below a predetermined
minimum.
5.- In combination with a furnace for burning 70
e'xcept by the breadth of thefelmms-appepded rlpulverized fuel, a pulverizing mill, means for sup-
hereto,“
.-
:_
' I What I claim-‘is: '
.
.
‘
t
‘plying fuel and air to the mill, a conduit con
necting the discharge of the mill with the fur-,
,1.‘ In‘ combination with'va furnace for burning ' nace, means operative to remove pulverized fuel
' pulverized fuel. a puiveri'zing mill, means for sup
and air from the mill and deliver it to the furnace
2,1 18,601
5
through the conduit, a damper adapted to close’ pressure is supplied to the pressure actuated
the conduit, pressure actuated means connected
to the damper constructed and arranged to nor
mally hold the damper in a position so that the
conduit is open, a pressure responsive device in
communication with the conduit at spaced points,
a second pressure responsive device in communi
means for operating the same, a valve in the pipe,
a device responsive to differences in pressure be
tweenlspaced points in the conduit, and means
connecting the valve and the device whereby
when the difference in pressure in the conduit be
tween said spaced points falls below a predeter
cation with the conduit at spaced points one of mined minimum, said device will operate the
which is different from those with which the ?rst ' valve and cause fluid under pressure to be sup
plied to the pressure actuated means and move 10
10 pressure responsive device is in communication,
the damper to close the conduit.
and means connected with each pressure respon
9. In combination with a furnace for burning
sive device for controlling the pressure actuated
pulverized fuel, a pulverizing mill, means for sup
means to cause the latter to move the damper to
close the conduit when the difference in pressure plying fuel and air to the mill, a conduit connect
115 in the conduit between the spaced points with‘ ing the discharge of the mill with the furnace, 15
which either of the pressure responsive devices means operative to remove pulverized fuel and
are in communication, falls below a predeter
mined minimum,
'
6. In combination with a furnace for burning
20 pulverized fuel, a pulverizing mill, means for sup
- plying fuel and air to the mill, a conduit connect
ing the discharge» of the mill with the furnace, an
exhauster fan in the conduit for removing
pulverized fuel and air from the mill and de
air from the mill and deliver it to the furnace
through the conduit, a damper adapted to close
the conduit, pressure actuated means'connected
, to the damper constructed and arranged to nor--, 20
>mally hold the damper in a position so that the
conduit is open, a pipe through which ?uid under
pressure is supplied to the pressure actuated
means for operating the same, a valve in the pipe,
25 livering it to the furnace through the conduit, , a device responsive to differences in pressure be
a damper adapted to close the conduit, pressure
actuated means connected to the damper con
structed and arranged to normally hold the
damper in a position so that the conduit is open,
30 a pressure responsive device in communication
with the conduit at a point adjacent the furnace
and at a point adjacent the pressure side of the
fan, a second pressure responsive device in com.
munication with the conduit at the pressure and
35 suction sides of the fan, and vmeans connected
with each pressure responsive device for con
trolling the pressure actuated means to cause the
latter to move the-damper to close the conduit
when the difference in pressure in the conduit
40 between the spaced points. with which either of
the pressure responsive devices is in communica
tion, falls below a predetermined minimum.
'7. In combination with a furnace for burning
pulverized fuel, a pulverizing mill, means for sup
45 plying fuel and air to the mill, a conduit connect
ing the dischargeof the mill with the furnace,‘
means operative to‘remove pulverized fuel and
air from the mill and deliver it to the furnace
through the conduit, a damper adapted to close
25
tween spaced points in the conduit, a second de
vice responsive to differences in pressure in the
conduit between spaced points one of which is
different from those with which the first. men
tionedidevice is ‘in communication, a connection 30
between 'one of the pressure responsive devices
and said valve, a second pipe through which fluid,
under pressure is supplied to the pressure actu
ated means, a valve in said second pipe, and a
connection between the last mentioned valve and 35
the other pressure responsive device, whereby‘
when the pressure difference between the points
in the conduit to which either pressure responsive
device is’ connected falls below a predetermined
minimum, ?uid under pressure will be admitted 40
to the pressure actuated means and cause the
latter to move the damper to close the conduit.
10. In combination with a furnace for burn
ing pulverizedfuel, a pulverizing mill, means for
supplying fuel and air to the mill, a conduit con
necting the discharge of the mill with the fur
nace, an exhauster' fan in the conduit for re- '
moving pulverized fuel and air from the mill and
delivering it to the furnace through the conduit,
a damper adapted to close the conduit, pressure 50
50 the conduit, pressure actuated means connected‘ ‘actuated means connected to the damper con
to the damper constructed and arranged to nor
mally hold the damper in a position so that the structed and arranged to normally hold the
conduit is open, a pipe through which ?uid under damper in a position so that the conduit is open,
pressure is supplied to the pressure actuated a pressure responsive device in communication
' , with the conduit at a point adjacent the furnace 65
55 means for operating the same, a valve in the pipe, and at a point adjacent the pressure side of the
a device responsive to pressure conditions existing
fan, a second pressure responsive device in com
at spaced points in the conduit, ‘and means con
necting the valve and said device whereby when munication with the conduit at the pressure and
the pressure differences between said spaced suction sides of the fan, a pipe through which
?uid under pressure is conducted to the pressure 60
60 points in the conduit falls below a predetermined actuated means, a valve in said pipe connected to
minimum, said device will operate the valve and
cause fluid under pressure to be ‘supplied to the one of the pressure‘responsive devices, a second
pressure actuated means and move the damper to pipe through which ?uid underpressure is sup
plied to the pressure actuated means, a valve in
close the conduit.
1
_
said second pipe, and a connection between the
8.
In
‘combination
with
a
furnace
for
burning
65
pulverized fuel, a pulverizing mill, means for last mentioned valve and the other pressure 1
supplying fuel and air to the mill, a conduit con , sponsive device, whereby when the pressure dif
ference between the points in the conduit; to
necting the discharge 'of the mill with the fur
nace, means operative to remove pulverized fuel which either pressure ‘responsive device is con
and air from the mill and deliver it to the furnace ' nect'ed falls below a predetermined minimum, 70
70 through
the conduit, a damper adapted Lto close ?uid under pressure will be admitted to the
the conduit, pressure actuated means connected
to the damper constructed and arranged to nor
mally hold the damper in a position so that the
- pressure actuated means andcause the latter to
move the damper to close the conduit.
.
11. In combination with a furnace for burning ‘
pulverized fuel, a pulverizing mill, means for sup- ~75
75 conduit is 0pen,,a pipe through which fluid under }
'
6
2,1°1e,eo1
,
plying fuel and air to the mill, a conduit connect
mit ?uid to escape from the cylinder wheneither.
ing the ‘discharge of the mill with the furnace,. of the valves is moved to cut o? the supply of
means operative to remove pulverized fuel and air ?uid to the cylinder, whereby when the‘pressure _
from ‘the mill and deliver it to the furnace difference between the points with which either 4'
through the conduit, a damper adapted to close of the pressure responsive devices are in com
the conduit, 9. cylinder having a piston connected ,munication falls below a predetermined mini
‘to the damper, means urging the piston in a di ~ mum. the ?uid in the cylinder will be permitted
rection to move the damper to close the conduit, to escape and the damper will be moved to. close
a pipe for supplying ?uidunder pressure to the the conduit.
'
14. In combination with a furnace for burn-‘ 10
10 cylinder to move the piston to cause the damper
to open the conduit and to maintain the damper ing pulverized fuel, a pulverizing mill, means for
in open position, a valve in the pipe and normally supplying fuel and air to the mill. a conduit con
in a position so thatthe pipe is open, a pressure necting the discharge of the mill with the fur
responsive device in communication with spaced
15 points in the‘ conduit, 8; connection between the
valve and the pressure responsive device, and
mean; permitting ?uid to escape from the .cyl
inder when the valve is moved to close the pipe
to cut off the flow of ?uid to the cylinder, where
by when the pressure diiference in the conduit
between said spaced points fallsbelow a pre
determined minimum, the damper will be moved
' to close the conduit.
5
nace, means operative to‘ remove. pulverized fuel“
and air from the mill and deliver it to the furnace 15
through the conduit, a. damperadapted to closev
,the onduit, a cylinder having a piston connected
to t e damper, means urging the piston in a di
rection to move the damper to close the conduit.
a pipe forsupplying ?uid under pressure to the
cylinder to move the piston to cause the damper
to open the conduit and maintain the damper
in .open position, and means responsive to pres
12. In combination with a furnace for burning ' sure conditions at spaced points in the conduit
~pulverized fuel, a pulverizing mill, means for sup
for cutting off the supply of ?uid under pressure
plying fuel and air to the mill, a conduit con
to the cylinder, whereby when the pressure dif
necting the discharge of the mill with the fur
ference in the conduit between said spaced points
nace, means operative to remove pulverized fuel falls below a predetermined minimum the means
and air from the mill and deliver it to the furnace in‘ging the piston in a direction to move the
through the conduit, a damper adapted to close damper to closed position will operate to close
the conduit, a cylinder having a piston connected the damper.
\
,
to the damper, means urging the piston in a di
15. In combination with a furnace for burning
rection to move the damper to close the conduit. pulverized fuel, a pulverizing mill, meansv for sup
a pipe for supplying ?uid under pressure to the plying fuel and air to the mill, a conduit ‘con
cylinder to' move the piston to cause the damper necting the discharge of the mill with the fur 85
‘to open the conduit'and to maintain the damper nace, means operative to remove pulverized fuel
in open position, a valve in the pipe and nor
and air from the mill and deliver it to the fur- '
mally in a position so that the pipe is open, a _ *nace through the conduit, a damper adapted to
pressure responsive device in communication with close the conduit, the conduit having an opening
spaced points in the conduit, a connection be- - to clear air, pressure actuated means connected
tween the valve and the pressure responsive de
vice,<»and means permitting ?uid to escape from
to the damper and arranged‘to normally’ hold
the ?ow of ?uid to the cylinder whereby when
the pressure diiference between'said spaced points
means responsive to differences in pressure at
in theiconduit falls below a predetermined mini
plying fuel and air to the mill,,,a conduit cone
necting the discharge of the mill with the fur
pressure actuated means to cause the latter to
move the damper to close the conduit and to per
mit the introduction of clear air/into the conduit
when the difference in pressure between the
spaced points in the conduit falls below a pre
determined minimum.
16, In combination with a furnace for burning Y
nace, anexhauster fan in the conduit for re
pulverized fuel, ' a pulverizin'g mill, means for
moving pulverized fuel and air from the mill
and delivering it to the furnace through the con?
duit, a‘damper adapted to close the ‘conduit, a
necting the discharge of the mill with the fur
the damper in a position so that the conduit is
the cylinder when the valve is moved to cut‘ off - open and said opening to‘ clear air is closed, and
mumathe damper will be moved to ‘close the
conduit.
.
~
'
13. In combination with a furnace for burning
pulverized fuel, a pulverizing mill, means for sup
‘_ cylinder having a piston connected to the damper,
means
the piston'in a direction to move
‘the damper-‘to close the conduit, a pipe for sup
plying ?uid§ under-pressure to the cylinder to
spaced points in the conduit for controlling the 46
supplying fuel and air to the mill, a conduit con
65
nace, means operative to remove pulverized fuel -
and air from the mill and deliver it to the furnace
through‘ the conduit, a damper adapted to close .
' the conduit,‘ the conduit having an opening‘ to
clear air on the suction side of the fan, said open .60
move the piston to cause the damper to open the a ing 'being disposed in the conduit so that the
conduit and t'o/maintain the damper in openpo
sition, a valve in the pipe and normally in a
position so that the pipe is open, a pressure re
sponsive device in communicatioifwith the con
duit at a point adjacent the furnace and at a
damper closes the opening'when the conduit is
open, pressure actuated means connected to the
. damper and‘ arranged to' normally hold the damp
er in a position so that the conduit is open and
said opening is closed, and means responsive to
point adjacent the pressure side of the fan, a - pressure conditions at spaced points in the con
second pressure responsive device in communica
duit'for controlling the pressure actuated means
tion1with the conduit at the suction and pressure -to cause the latter to move the damper to close
sides of the fan, said valve being connected ‘to one the conduit and open said opening and permit "70
of the pressure responsive devices, another valve clear air. to be drawn into the conduit when the .
in the pipe normally in open position and con
pressure difference between > said 'spaced points
nected to the other pressure responsive device
and a_ pressure release pipe controlled by each
of :the valves and connected to said pipe to per
therein falls below a predetermined minimum. '
15
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