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Патент USA US2135698

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J. S.I BENNETT
2,ì35,698
FURNACE STOKER
original Filed oct. 23', 1954
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2 Sheets-Sham’I l
Nov. 8, 1938.
J. S. BENNETT
2,135,698
FURNACE STOKER
Original Filed Oct. 23, 1934
2 Sheets-Sheet 2
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If? @afar
2,135,698
Patented Nov. 8, 1938
_A » v.UNITED STATES PATENT OFFICE
FURNACE STOKER
Joseph S. Bennett, Merion, Pa., assìgnor to Amer
ican Engineering Company, Philadelphia, Pa.,
a corporationrof Pennsylvania
original application october 23, i934, serial No.
749,539. Divided and this application Septem«
ber 22, 1937, serial Np. 165,057
10 Claims.
cally a short distance adjacent the front wall of
ing application Ser. No. 749,539, filed October
23, 1934, and the invention‘here involved relates
to stoker furnaces, and more particularly to stok
the furnace and terminate in a header 26 suitably
supported in said wall. These vertical exten
sions of the tubes cool the portions of the wall
5 ers having fluid cooling means associated there
with for preventing clogging of the tuyère open
ings by slag and clinker formations. The ash
content of certain types of coals, it has been
¢ found, not-only fuses at a comparatively low tem
10 perature, but forms an impervious mass when
adjacent the inlet passages to the retorts and 5
minimize the formation and growth of clinkers
thereon. The lower ends of tubes 25 continue
downwardly at a slightly steeper angle and are
disposed in cooling relation with a series of fixed
cooled which clogs the air openings of the grates
extension grates 31; the movable extension grates 10
9 being in alignment only with the retorts and
as well as impairs the operation of the stoker
thus are not in contact with the tubes.
as a whole.
tubes 25 terminate at the lower ends thereof
in a header 35 supported in any suitable manner
beneath extension grates 9 and 31. Connected 15
In many cases it is necessary to ex
tinguish the ñre at frequent intervals so that
15 the slag and clinker masses adhering to the grates
may be removed.
One object of the present invention is to pro
vide means for preventing such damage to the
grates and to insure'efûcient burning of all fuels.
v20 lAnother object is to provide in an underfeed
Stoker a plurality of fluid conducting tubes >dis
`csed in cooling relation with the tuyère rows
and extension grates to prevent injury thereto
by the furnace heat and clinker formations.
Í25
(Cl. 122-4) '~
This application is a division of my co-pend
A further object is to provide a stoker of the
continuous ash discharge type wherein the en
tire exposed surface thereof is effectively cooled
by fluid conducting means.
Other'and further objects will become appar
-30 ent as Vthe description of the invention progresses.
Of the drawings:
`Fig. 1 is a longitudinal sectional View taken
through a furnace, showing one type of fluid
`cooled stoker of the continuous ash discharge
35 type.
g
Fig. 2 is a plan view taken substantially along
line 2_2 of Fig. 1, and
r
Fig. 3 is a longitudinal sectional View of a stoker
of a modified construction.
40
Referring to the drawings, the numeral l des
ignates a furnace having provided therein an un
derfeed stoker 2, comprising alternately disposed
retorts 3 and tuyère rows 4. Fuel is fed into the
retorts 3 from hoppers 5 by any suitable feeding
1145 mechanism, partially indicated at 6, and operat
ed by any suitable power mechanism (not shown).
The fuel entering the retorts 3 is underfedl over
the length thereof by pushers' 8, and the exten
sion grates 9 provided at the rear end of the
50 sto-ker overfeed the fuel through a discharge
opening â! provided in the rear or bridge wall
i3 of the furnace. As shown in Figs. 1 and 2, a
series of fluid conducting tubes 25 are, mounted
on the tuyere blocks of each of the tuyère rows
l55 ll. The upper ends of tubes 25 extend verti
The
to and extending rearwardly of header 35 are a
series of tubes 38, the substantially horizontal
portions 38’ of which form a shelf which re
ceives the consumed'fuel fed from the extension
grates 9 and 31, while the substantially vertical 20
portions 38” thereof are connected at their
lower ends to a header 39 mounted in any suit
able manner upon a support 49. The bridge wall
13, as shown in Fig. 1’, terminates above the tubes
38 and has provided 'therein a series of fluid con- 25
ducting tubes I4. 'I-'he'lower ends I4’ of these
tubes form the exposed surface of the upper wall
of passage 4l, and terminate in a header I6. The
tubes lll are bent, as shown at 14”, and extend
upwardly and form the exposed surface of bridge 30
wall I3. The upper ends of -these tubes may be
connected to a header, or directly to a boiler
(not shown). Headers E8 and 39 are connected to
the boiler by downcomer connections I6' and 39’
respectively, while header 26 is connected to said 35
boiler by riser connection 2BA.
Fig. 3 shows a construction somewhat on the
order of that shown in Figs. 1 and 2, except
that the tubes 25' provided on tuyère rows 4' ex
tend rearwardly of the stoker, as shown at 38A,
forming a portion of a shelf which receives the
residue fed from the stoker. lIn this construc
tion the extension grates 9 and 31, shown in Figs.
1 and 2, are dispensed with, and the lower ends
of tubes 25’ terminate in a header 39A supported
at Gil’. A header 35’ is supported in any suit
able manner beneath the lower end of the stoker,
which receives the upper ends of an alternately
disposed series of tubes 42 disposed in substan
tial alignment with the retorts 3’. These tubes
extend in parallel relation with the extended por
tions 39A of tubes 25' and also terminate at their
lower ends in header 39A. In this construction
a series of refractory elements ¿53 are secured to
tubes 25’ and 42, as shown in Fig. 3. These ele-
40
45
50
55
2,135,698
ments are mounted in spaced relation, forming
openings therebetween through which draft air
end of said rear `wall and forming therewith a
passage, said extension comprising a series of
fluid conducting tubes, and means comprising a
series of fluid conducting tubes mounted on the
exposed surfaces of said rear wall.
3. In a furnace, the combination of a rear wall
having a transverse recessprovided at the lower
end thereof, a front wall, a stoker inclining down
may pass, as indicated by the arrows in Fig. 3.
The plenum chamber beneath the stoker is di
vided into compartments 44 and 45 by a wall 46.
Air enters chamber 44 through an inlet passage
41, a portion of Iwhich may pass into chamber
45 through the opening 48 provided in wall 4B.
The amount of air flowing into compartment 45 wardly and rearwardly from said front wall, said
10 may be regulated by a damper 49 operated'wby ‘.stoker consisting of alternately disposed retorts
a rod 50. Under certain conditions it maybe „and tuyère rows, an extension provided at the
desirable to provide pressure means to cause a lower end of said stoker and extending into the
more rapid circulation offluid inthe tubes '25’~ -recess providedin said rear wall, said extension
and 42 of the stoker. To this end a booster pump beingî'disposed in spaced relation with the lower
I0l is provided which, as shown in Fig. 3, is con
end of said rear’wall and forming therewith a
nected to the boiler (not shown) byva-downtake passage,y said extension comprising a series of
connection |02 and feeds fluid underpressure to fluid conducting tubes, means comprising one or
header 39A through pipe |03. Headers V35’ and lmore tubes mounted in cooling relation with said
26’ are connected to the boiler by riser connec
tuyère rows, headers connecting the opposite ends
20 tions 35A and 28B, respectively. The substan
of said tubes, and means comprising a series of
tially horizontal section 38Ais spaced from the fiuidA conductingtubesmounted on the exposed
lower endl of bridge wall I3', thus providing a surface of said rearwall.
passage 4l’ through -which the refuse from ythe
4. In an underfeed stoker, comprising alter
stoker is fed. The exposed surface of bridge nately disposed retorts and tuyère rows,.of al
wall I3’ also has provided thereina series of fluid ternately disposed fixed and moving extension
conducting tubes 14A which extend forwardly and _grates mounted at the rear end of said retorts
upwardlyfrom a header IBA. The upper ends and tuyère rows, fluid conducting tubes mounted
of> tubes UiA may be connected to a header or di
over said tuyère rows and fixed extension grates,
rectly to one of the steam drums ofra boiler (not
upper and lower headers for receivingthe oppo
shown).
site endsv of said tubes, a second series of liuid f
'
The constructions herein shown and described
not only lower the maintenance cost of stokers,
~but permit furnaces to operate for long-periods
ofk time without interruption.
These construc
' tions are especially desirable when the fuels
burned are ofthe type wherein the ash content
thereof fuses -at low temperatures.Y This molten
vash has a tendency to clog-the tuyère openings,
and thus prevents the proper amount of air to
~1 410 enter the fuel bed.
This also-causes-considerable
damage to the grates with the result that the
maintenance cost is not only high, but-a consid
erable loss is experienced in taking the boilers off
the line to make the necessary repairs. The con
.structions herein shown havelargely eliminated
these undesirable conditions andfhave also in
creased the efficiency of the units as well.
-While the invention is shown applied to stokers
ofthe underfeed type, it is believed tobe appar
entthat it is equally adaptable for use in other
types of stokers as well. The invention there
fore is not to be limited to the embodiments here
in shown since it may be embodied in other forms,
all coming within the scope Aof claims which
follow.
What is claimed is:
l. In a furnace, the combination of :a rear'wall
having a transverse recess provided at the lower
. end thereof, a front wall, a stoker inclining down
wardly and rearwardly from said front wall, a
longitudinal extension provided at the rearwardly
disposed end of said Stoker, said extension ex
tending into the recess provided in said rear wall
and forming with the lower end of the latter a
65 passage, and means for fluid cooling said stoker
and rear wall.
2. In a furnace, the combination of a rear wall
having a transverse recessprovided at the lower
end thereof, a front wall, a stoker inclining down
70 wardly and rearwardly from said front wall, said
AStoker consisting of alternately >disposed retorts
and tuyère rows, an extension provided at the
lower end of said Stoker and extending into the
recess provided in said rear wall, said extension
10
15
20
25
conducting tubes connected to and extending
rearwardly of said lowerheader forming a` shelf
for supporting the fuel fed by said extension
grates, and a series of fluid conducting tubes pro
vided above and in spaced relation with said shelf 5
forming therewith a passage through which .the
fuel discharging from said` Stoker may pass.
5. `In an underfeed` stoker, comprising alter
nately disposed retorts and tuyère rows, of means
for feeding fuel to said retorts and tuyère rows,
one or more fluid conducting tubes mounted over
each tuyèreV row, the lower ends of said tubes ex
tending rearwardly forming a support for the fuel
fed from said stoker, said tubes terminating at
their' lower ends in a header, a second header for ;_
the upper ends of >said tubes, a third header dis
posed near the lower end of said retorts and
tuyère rows, a series -_of tubes extending rear
wardly of said header and inparallel relation
with theV extensions ofv said first mentioned. tubes, .i
and terminating in said header first named, and a
series of fluid cooled tubes mounted above and in
spaced relation with said support and forming
therewith a discharge passage for ther fuel dis
charging from the stoker.
6.„In an underfeed stoker, comprising alter
nately disposed retorts and tuyère rows, of means
for feeding fuel to said retorts-and rows of tu
yères, one or more fluid connecting tubes mounted
in `cooling relation with the tuyères of each of '00
said rows, the lower ends of said tubes extending
>rearwardly and forming a support for. the fuel
fed from said stoker, said tubes terminating at
ytheir lower ends in a header, a second header for
the upper ends of said tubes, a third header dis
posed near the lower end of said retorts `and
tuyère rows, a series of tubes extending rear
wardly of said header and in parallel relation
with the extensions of said first mentioned tubes
and terminating in said header ñrst named, and
means for supplying fluid to at least one of said
headers.
'1. In an underfeed stoker, comprising alter
Vnately disposed retorts and rows of tuyère
75 being disposed in spaced relation with the lower .blocks„ of means for feeding fuel to said re
3
2,135,698
torts and rows of tuyère blocks, one or more
fluid conducting tubes mounted in cooling rela
tion with the tuyère blocks of each of said rows,
the lower ends of said tubes extending rearward
ly, forming a support for the fuel fed from said
stoker, said tubes terminating at their lower
ends in a header, a second header for the upper
ends of said tubes, a third header disposed near
the lower ends of said retorts and tuyère rows,
a series of tubes extending rearwardly of said
header and in parallel relation with the exten
sions of said first mentioned tubes- and termi
nating in said header ñrst named, a boiler,
means for connecting said headers to said boiler,
and a booster pump for feeding fluid under pres
sure from said boiler to one of said headers.
8. In an underfeed stoker, comprising alter
tubes, and means for supplying fluid to said
last mentioned header.
9. In an underfeed Stoker, comprising alter
nately disposed retorts and rows of tuyère blocks,
of alternately disposed ñxed and movable ex
tension grates mounted at the rear end of said
retorts and rows of tuyère blocks, one or more
íiuid conducting tubes mounted in cooling re
lation with the tuyère blocks of each of said rows
and. said ñxed extension grates, upper and lower 10
headers for receiving the opposite ends of said
tubes, a series of fluid conducting tubes con
nected to and extending rearwardly of Isaid lower
header forming a shelf for supporting the fuel
fed by said extension grates, and a series of 15
iluid conducting tubes provided above and in
spaced relation with said shelf forming there
nately disposed retorts and rows of tuyère blocks,
of alternately disposed, fixed and movable ex
tension grates mounted at the rear end of said
with a passage through which the fuel discharg
ing from said stoker may pass.
retorts and rows of tuyère blocks, one or more
wall having a transverse recess provided at the
lower end thereof, a front wall, a stoker inclin
fluid conducting tubes mounted in cooling re
lation with the tuyère blocks of each of said rows
and said fixed extension grates, upper and lower
headers connecting the opposite ends of said
tubes, a second series of fluid conducting tubes
connected to and extending rearwardly of said
lower header forming a shelf for supporting the
fuel fed by said extension grates, a header con
30 necting the other end of last last mentioned
10. In a furnace, the combination of a rear
ing downwardly and rearwardly from said front
wall, a longitudinal extension provided at the
rearwardly disposed end of said Stoker, said ex
tension being disposed beneath the lower end
of said rear wall and forming therewith a pas
sage, and means for ñuid cooling said Stoker.
JOSEPH S. BENNET’I’.
30
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