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Патент USA US2135682

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Nov. 8, 1938.
e. A. STEPHENS
STOKER
Filed July 2, 1936
2,135,632
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2 Sheets-Sheet 1
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Nov. 8, 1938.
I
G. A. STEPHENS
STOKER
I
Filed July 2, 1956
29135582
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2 Sheets-Sheet 2
Patented Nov. 8, 1938
2,135,682 *
UNITED STATES ' PATENT OFFICE
Gordon A. Stephens, Long Branch, Ontario, Can
ada, assignor to ‘American Engineering Com
pany, Philadelphia, Pa., a corporation of Penn
sylvania
Application July 2, v1936, Serial No. 88,545
10 Claims.'~ (01. 122-4)
locks l? to protect them against the action of
This invention relates to stokers, and more par
ticularly to ?uid cooled stokers of the multiple; the fuel and ash, if it is so desired.
The stoker 3 in the present instance comprises
retort underf-eed type.
; >
an underfeed section 18 consisting of alternately
One object of the present invention is to pro
vide a simpli?ed and generally improved stoker disposed retorts I9 and tuyere rows 29, and an,
overfeed extension grate section 2i. ‘Fuel is sup
of the stated character.
'
_
Another object is to provide an improved ?uid plied to the stoker from hoppers 22 mounted
cooling system for stokers which insures proper exteriorly of the front wall which empty into
circulation of the ?uid therethrough under all cylinders '23 in line with the retorts, and’ rams
(not shown) operating in said cylinders feed
conditions of operation with the use of a mini~
mum of fluid connections with the source ofv predetermined quantities of fuel to said retorts
upon each reciprocation thereof. Fuel is under;
fed along the retorts [9 by a series of pushers 24.
The rams and pushers are operated by any suit
compactly arranged furnace comprising a con
15 tinuous discharge stoker arranged adjacent the able p'ower mechanism 25, the pushers being con 15?
nected thereto by a link and lever mechanism
boiler and including a novel ?uid system dis
posed in cooling relation with the stoker and the ' indicated at 26. The lower end of each retort
has provided therein a horizontally disposed dead
walls of the furnace.
Other and further objects of the invention will plate 21, which lies in substantially the same
plane as the overfeed section 2!.
' 20
20 become apparent as the description of them
Extending rearwardly from a header 28 dis
vention progresses.
?uid supply.
'
A further object is to provide a simpli?ed and
Of
the
drawings:
' ‘
Fig. 1 is a longitudinal sectional view take
through one of the stoker retorts showing the‘
25 arrangement of the boiler and the stoker of the
furnace, andthe improved ?uid cooling system
associated therewith.
Fig. 2 is a plan view partly in section taken
substantially along line 2-2 of Fig. 1, and
Fig. 3 is a plan view of the ?uid cooling system
30
for the stoker.
-
Referring to the drawings, the numeral I des
ignates generally a furnace comprising a boiler
2 ?red by a multiple retort underfeed stoker 3.
35 The, boiler 2 in the present instance is of the
vertical tube type and consists of a steam drum 4,
a mud drum 5, and a series of substantially ver
tical banks of tubes 6 extending between said
drums. The combustion chamber 1 of the fur
40 nace is bounded at the sides thereof by walls 8
and 9, at the front by a wall ill, at the top by
an upwardly and rearwardly inclined wall I I, and
at the rear by the forwardly disposed bank of
boiler tubes H2. The walls 8, 9, Ill and II may
45 be constructed of any suitable refractory ma
terial.
The side walls 8 and 9 have each provided
therein adjacent stoker 3, a series of inclined
‘tubes l3 and M respectively. Tubes l3 and I4
are connected at the upper ends thereof to head
posed transversely beneath the stoker are a series
of fluid conducting tubes 29. These tubes are
mounted inintimate relation with dead plates
2'! and terminate'in a second transversely dis
25'.
posed header 3!]. As shown more particularly
in Figs. 2 and 3, each dead plate 21 has‘ two
tubes associated therewith, although it is ap
parent that the number of tubes so disposed may
be varied without departure from the invention.
Disposed between each pair of tubes 29 and'exe
tending forwardly from header 3% is a second
pair of tubes 33. These tubes extend in parallel
relation with tubes 29 between header 3% and
the lower end of tuyere rows 23. Tubes 3! then
incline upwardly and forwardly and make inti
mate contact with said tuyeres, and then are
bent upwardly so as to lie in abutting relation
with wails it and H and terminate at their
upper ends in the steam drum 4 of the boiler.
Thus, tubes 3! not only cool a portion of the
overfeed section 2i and the tuyéres 20, but also‘
cool the front and top Walls of the combustion
chamber '7. As shown in Figs. 1 and 2, headers
28 and 36 are supported on. I beams 32 and 33
respectively, extending transversely of the stoker
3 and supported at the ends thereof in side walls
8 and ii. Header 28 is connected to drum 5 of
the boiler by a pair of downtake connections 3-3 >
and 35, while headers l5 and [6 are connected 50$
to steam drum 4 by risers 36 and 3'1, respectively.
As shown in Figs. 1 and 2, risers 3B and 31 extend
through front wall It] and lie in abutting relation
ers l5 and I6 respectively, disposed outwardly of
front wall it, and at their lower ends to mud
drum 5. Tubes 13 and I4, and the lower por-' with top wall I and thus also serve to cool a por
55 tions of tubes l2 may be covered by protective, tion of said wall. It therefore is seen that ?uid 55.?
2
2,135,682
from boiler 2 flows into header 28 through down
take connections 34 and 35, thence through tubes
29 to header 30, and thence through tubes 3| to
steam drum 4, as indicated by the arrows in Fig.
3. By this construction it is unnecessary to pro
vide additional connections between header 3|]
and the boiler 2.
Mounted on a rod 38, supported in bearings
38’, attached at intervals to header 30, are a
10 series of dump plates 39. A lever 40 secured to
one end of rod 38 and disposed exteriorly of
wall 8 is provided to adjust plates 39 to vary the
size of the discharge opening 4| de?ned by said
plates, the bank of tubes 12, and the rear wall
15 42 of an ash pocket 43, as shown in Fig. 1.
Draft air is supplied to the stoker by any suit
able fan mechanism (not shown) and enters
a plenum chamber 44 disposed beneath the stoker
through a duct 45. This air passes between the
20 grates of the stoker and ?ows through the com
bustion chamber 1 and the various boiler passes,
as indicated by the arrows in Fig. l, and dis
charges to the stack through an opening 46 pro
vided in the rear wall 41 of the furnace.
25. The overfeed grate section 2| in the present
instance consists‘of a series of metallic or refrac
tory blocks 48 secured to the rearwardly disposed
portions of tubes 29 and 3|, and the top surface
of header 30. A slight space is provided between
30 the adjacent edges of these blocks through which
draft air may pass to the fuel bed, overlying the
same. Other forms of grate blocks may also be
employed if it is so desired without departing
from the invention. Draft air is supplied to ex
35 tension grate 2| fr'om plenum chamber 44 through
the connecting passage 49. Dampers 50 may be
provided in this passage to control the ?ow of
air to the overfeed extension section 2|, if it is
so desired. Any siftings passing between blocks
40 48 of the extension grate section gravitate into
a hopper 5| disposed therebeneath. These sift
ings may be removed from the hopper from time
to time by simply opening a closure 52 provided
at the bottom thereof.
From the foregoing description it is seen that
45
a simpli?ed and highly improved stoker has been
provided. The grates, the dead plates and the
overfeed grate section of the stoker, as well as
the walls of the furnace, are effectively cooled by
a simpli?ed, as well as highly e?icient cooling
50
system. Also, by arranging the boiler and stoker
in the manner shown herein intermediate walls
may be dispensed with. The arrangement of the
dump plates in respect to the forwardly disposed
55 bank of boiler tubes further provides a continu
ous ash discharge construction wherein the rate
of ash discharge may be varied to best suit the
operating conditions of the furnace.
While the embodiment herein shown and de
60 scribed is admirably adapted to ful?ll the objects
primarily stated, it is to be understood that the
invention is not to be limited thereto, since .it
may be embodied in other forms, all coming with
in the scope of the claims which follow.
65
What is claimed is:
1. In a furnace, the combination’of a stoker,
comprising alternately disposed retorts and tu~
yere rows, substantially horizontally disposed fuel
supporting means provided at the lower end of
70 each of said retorts, means comprising one or
more ?uid conducting tubes disposed longitudi
nally of and in cooling relation with said fuel
supporting means, headers connecting the oppo
site ends of said tubes, a boiler, means connect
Tfl ing one of said headers with said boiler, means
comprising one or more tubes extending from the
other of said headers and disposed in cooling
relation with said tuyere rows, said last men
tioned tubes being connected to said boiler where
by ?uid from said boiler circulates to said ?rst
mentioned header and through said ?rst men
tioned tubes to said second header, thence
through said second mentioned tubes and back to
.the boiler.
, , ,2. In a furnace, the combination of a stoker, 10
comprising alternately disposed retorts and tu
yere rows, a dead plate disposed at the lower
end of each of said retorts and extending between
adjacent tuyere rows, one or more ?uid con
ducting tubes disposed longitudinally of and in 15
cooling relation with each of said dead plates,
front and rear headers connected to said tubes,
a boiler, means connecting said front header to
said boiler, one or more ?uid conducting tubes
extending from said rear header and disposed in 20
cooling relation with each of said tuyere rows, a
combustion chamber disposed above said stoker
having front, side and top walls, said last men
tioned tubes extending upwardly and lying in
substantially abutting relation with said front and
top walls and terminating in said boiler.
3. In a furnace, the combination of a stoker,
comprising alternately disposed retorts and tu
yere rows, a dead plate disposed at the lower end
of each of said retorts, one or more ?uid conduct
301.1
ing tubes mounted in cooling relation with each
of said dead plates, front and rear headers con
nected to said tubes, a boiler, means connecting
said front header to said boiler, one or more ?uid
conducting tubes extending from said rear header
and. disposed in cooling relation with each of said
tuyere rows, a combustion chamber disposed above
said stoker having front, side and top walls, said
last mentioned tubes extending upwardly and
lying in substantially abutting relation with said 40',
front and top walls and terminating in said boiler,
means comprising a series of ?uid conducting
tubes disposed adjacent each of said side walls,
a‘ header connected to one end of each of ‘said
series of tubes, the other end of said tubes being
connected to said boiler, and risers connecting
said headers with said boiler, said risers lying in
substantially abutting relation with said top wall.
4. In a furnace, the combination of a stoker
having an underfeed section and an overfeed sec
tion, said underfeed section consisting of alter
nately'disposed retorts and tuyere rows, fuel sup
porting means‘ disposed at the lower ends of said
retorts and extending between adjacent tuyere
rows, said fuel supporting means being disposed in
substantial alignment with said overfeed section,
?uid conducting means mounted in cooling rela
tion with‘ said fuel supporting means, overfeed
section, and tuyere rows, and means for supply
ing ?uid to said ?uid conducting means.
5. In a furnace, the combination of a stoker
having an underfeed section and an overfeed sec
tion, said underfeed section consisting of alter
nately disposed retorts and tuyere rows, dead
plates disposed at the lower ends of said retorts
and in substantial alignment with said overfeed
section, ?uid conducting means mounted in cool
ing relation with said dead plates, overfeed 'sec
tion, and tuyere rows, and means for supplying
?uid to said ?uid conducting means.
‘ 6. In a furnace, the combination of a stoker
having an underfeed section and an overfeed sec
tion, said underfeed section consisting of alter
nately disposed retorts and tuyére rows, fuel sup
porting means disposed at the lower ends of said
70,
2,185,682
retorts and extending between adjacent tuyere
3
one or more ?uid conducting tubes mounted in
rows, and means for supplying ?uid to said ?uid
conducting means.
9. In a furnace, the combination of a stoker
having an underfeed section, and an extension
cooling relation with said fuel supporting means
and portions of said overfeed section, front and
grate section, said underfeed section consisting
of alternately disposed retorts and tuyére rows,
rear headers connected to the opposite ends of
said tubes, one or'more ?uid conducting tubes ex
fuel supporting means disposed at the lower ends
of said retorts and extending between adjacent
tuyere rows, said fuel supporting means being dis
posed in substantial alignment with said exten 10
sion grate section, one or more ?uid conducting
tubes mounted in cooling relation with said fuel
supporting means and portions of said extension
grate section, front and rear headers connected to
the opposite ends of said tubes, one or more ?uid 15
conducting tubes extending forwardly of said rear
header, a portion of each of said last mentioned
tubes lying in substantially the same plane as said
?rst mentioned tubes and in cooling relation with
rows, said fuel supporting means being disposed in
substantial alignment with said overfeed section,
tending forwardly of said rear header and in cool
10 ing relation with other portions of said overfeed
section, and means for supplying ?uid to said
front header.
7. In a furnace, the combination of a stoker
having an underfeed section and an overfeed sec
tion, said underfeed section consisting of alter
nately disposed retorts and tuyére rows, fuel sup
porting means disposed at the lower ends of said
retorts and extending between adjacent tuyere
rows, said fuel supporting means being disposed
20 in substantial alignment with said overfeed sec
tion, one or more ?uid conducting tubes mounted
in cooling relation with said fuel supporting
means and portions of said overfeed section, front
and rear headers connected to the opposite ends
25 of said tubes, one or more ?uid conducting tubes
extending forwardly of said rear header, a por
tion of each of said last mentioned tubes lying in
substantially the same plane as said ?rst men
tioned tubes and in cooling relation with other
30 portions of said overfeed section, and a portion of
said last mentioned tubes lying in cooling relation
with said tuyere rows, and means for circulating
a cooling medium through said tubes and headers.
8. In a furnace, the combination of a stoker
35
having an underfeed section, and an extension
grate section, said underfeed section consisting
of alternately disposed retorts and tuyére rows,
fuel supporting means disposed at the lower end
of each of said retorts and extending between ad
jacent tuyere rows, said fuel supporting means
being disposed in substantial alignment with said
extension grate section, ?uid conducting means
mounted in cooling relation with said fuel sup
45 porting means, extension grate section, and tuyére
other portions of said extension grate section, and 20
a portion of said last mentioned tubes lying in
cooling relation with said tuyere rows, and means
for circulating a cdoling medium through said
tubes and headers.
_
10. In a furnace, the combination with a boiler 25
having a plurality of banks of substantially ver
tical tubes, of a stoker comprising an underfeed
section and an overfeed section for firing said
boiler, said underfeed section consisting of alter
nately disposed retorts and tuyére rows, a dead
plate disposed at the lower end of each of said
retorts and lying in substantially the same plane
as said overfeed section, means for feeding fuel
to and along said stoker, means comprising a
series of ?uid conducting tubes mounted in cool 35
ing relation with said dead plates, overfeed sec
tion, and tuyere rows, means connecting said tubes
to said boiler, adjustable dump plates disposed
at one end of said stoker for supporting the
residue fed from the latter, said dump plates being 40
spaced from one of the banks of tubes of said
boiler forming a discharge opening for said resi
due, and means for adjusting said plates to vary
the size of said discharge opening.
GORDON A. STEPHENS.
45
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