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Патент USA US2122807

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July 5, 1938.
2,122,807
H. c. CARTER
anummous ASH REMOVER FOR UNDERFEED STOKERS
Filed June 18, 1935
2 Sheets-Sheet 1
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2,122,807
Patented July 5, ‘1938
UNITED STATES PATENT OFFICE
2,122,807
BITUMINOUS ASH REMOVER FOR UNDER
‘FEED STOKERS
\\
Haskell C. Carter, Portland, 0reg., assignor to
Iron Fireman Manufacturing Company, Port
‘land, Oreg.
Application June 18, 1935, Serial No. 27,195
7 Claims. (01. 110-.-45)
This invention relates generally to underfeed
stokers, and particularly to bituminous ash re
The main object of this invention is the con
5 struction of an ash remover for bituminous un
derfeed stokers which will so affect the manner
in which the coal is consumed that it will reduce
the tendency to form clinkers, thereby simplify
ing the problem of removing the incombustibles
~~
showing the ash removal worm exposed and the
fuel feed duct broken away in section to dis 5
close the fuel feed worm and showing the outline
of the furnace in dotted lines.
‘
Fig. 2 is a vertical section taken along the line
2-2 in Fig. l.
Fig. 3 isa fragmentary vertical developed sec- 10 '
10 from the combustion zone. -
The second object is to provide an improved
form of ash remover which incorporates a means
for delivering air to a larger/ area of the bum
ingsurface than is ordinarily possible and at the
15 same time make it possible to vary the rate of
flow of said air to various portions of the fuel bed.
The third object is to construct an ash re
mover which makes possible the use of small
discharge openings for the ashes at the same
time eliminating shearing points between the
ash ports and the ash removal arms with the
consequent reduction of noise which accompanies
clinkers crushing and also avoiding the difficulty
of having clinkers wedged between the ash re
25 moval arms and the ash plate.
I The fourth object is to so construct the ash
remover that the coal will be burned over a rela
tively large area at a temperature below the fus
ing point of the incombustibles bringing about a
30 condition which is extremely favorable to- the
mechanical removal of the ashes.
The ?fth object is to construct a retort and
tuyere assembly together with the surrounding
ash rings with a relatively small inside tuyére di
35 ameter where the green coal enters the fuel bed
for the purpose of breaking up any coke columns
which might form and also to increase the active
burning area for the coal.
‘
Fig. 1 is a side elevation of a complete stoker
movers therefor.
20
illustrated in the accompanying drawings, in
which:
_
The sixth object is to provide a special form
40 of ash ring adapted to be selectively rotated to var
ious positions 'for the purpose of varying the ratio
of the air flow to the inner part of the retort with
relation to the‘ flow to an outer portion of the
retort and also to obtaina regulation'for the
45 pressure of the air ?owing toward the outer por
tion 'of' the ‘retort.
The seventh object is to construct the portion
of the tuyére which is subjected to the most
intense heat, aswell as the projecting arms, in
the form of an integral casting of a high alloy
heat resisting steel and to so mount same that it
-may be easily replaced if necessary.
I accomplish these and other objects in the
55 manner set forth in the‘ following speci?cation as
tion taken along the line 3-3 in Fig. 2.
Fig. 4 is a plan of the tuyere and ash remov
ing section with portions broken away in horizon
tal section.
Fig. 5 is a vertical section taken along the line 15
5—5 in Fig. 4 showing the ring in its lowest ad
justed position.
Fig. 6 is a section taken along the line 6—-<6 in
Fig. 5.
Fig. 7 is a section taken along theline 1—-1 in 20
Fig. 2.
Similar numbers of reference refer to similar
parts throughout the several views.
Referring in detail to the drawings, there is
shown a hopper Hi from which coal is conveyed 25
through a coal tube ll by means of a coal feed
ing worm l2 which is driven from a motor l3
through gearing contained within a transmission
casing Id. The coal tube ll terminates in a re~
tort l5 which is surrounded by the plenum cham- 30
her walls‘ IS.
A floor plate 11 forms the bottom _
of the plenum chamber l8, while the side walls
l6 merge into the horizontal top I9 which extends
into the retort l5.
A circular plate 20 is mounted on the top It
and secured thereto by means of bolts 2!. Open
ings 22 are formed through the top l9 and the
plate 20 for the upward passage of air from the
plenum chamber Hi to which air is supplied
through an air duct 23 by a fan (not shown).
Rotatably mounted on the plate 20 is the outer
tuyere wall 24, whose horizontal flange 25 rotates
upon the plate 20 and extends beyond the‘souter
edge of the plate 20. A toothed ring 26 is secured
to the underside of the extending portion of the
?ange 25 and meshes with the inclined ash re
moving worm 21 which occupies the ash remov
‘ing duct 28 and is driven from its upper end
through a universal joint (not shown) by means
of a sprocket wheel 29 which is connected by the
chain 30 to the power takeoff sprocket wheel 3|
on the side of the transmission casing H. The
“upper side of the end 32 of the ash removing ‘duct
“28 is cut away to expose theworm 21 to the
toothed ring 26 and to the ashes which fall down-
35
40
45
50
55
2.
‘2,122,807 '
wardly around the .outside of the plenum cham~
ber l8.
Projecting inwardly from the outer tuyere wall
24 are the spokes 33 which connect with the cir
cular inner tuyére wall 34, whose lower end _35
extends downwardly into the opening 36 formed
in the center of the plate 20. The interior of
the wall 34 registers with the interior of the re
tort l5. The end 35 preferably does not engage
10 the wall of the opening 36 or the top l9. The
top side 31 of the tuyére wall 34 slopes down
wardly from its outer and inner edges to an in
termediate line 38.
Supported on the top side 31 and on the top
15 of the outer tuyére wall 24 is the element 39,
from the top face of which projects a plurality
of radial arms 40, the underside of each of which
has formed therein a channel 4| through which
air can pass upwardly from the space 42 through
20
the opening 43 and be discharged downwardly
from the arms 40.
Within the wall 34 are
formed the air outlets 45, the top side of which
is formed by the element 39. The outer portion
46 of the element 39 rests upon the wall 24 in
25 whose upper edge are formed the notches 41
through which air can pass from the space 42
to the outer side of the wall 24 without passing
. through the arms 49.
The element 39 is held in position by means of
30 the hooks 48 which engage the lugs 49 formed
on the inner side of the wall 24 when the ele
ments 24,and 39 are rotated with relation to
each other in one direction and are prevented
from becoming disengaged byrotation in an op
3.5 posite direction by means of a headed pin 58
which extends downwardly through the element
39 on the opposite side of the next adjacent
lug 49.
.
Secured to the outer side of the walls l6 are
the upwardly extending brackets 5| whose upper
ends 52 occupy the recesses 53- in the outer rim
54 from which extend inwardly the radial arms
55, whose upper edges 56 are spaced below the
under edges 51 of the arms 40. ~Resting upon
the upper edges 56 of the arms 55 is an annular
outer ash ring 58, whose outermost edge 59 is
spaced from the innermost surface 68 of the
outer rim 54. The edges 59 and 6| of the outer
ash ring 58 are preferably undercut, as shown.
On the underside of the outer ash ring 58
are formed the notches 62 which engage the
arms 55 and serve to prevent the rotation of the
ring 58 as well as to hold same concentric with
relation to the outer portion 46 of the element
55 39. Between the inner edge 6| of the ash ring
to the ?oor line forming an ash well 12 into
which the ash duct end 32 extends.
The operation of the device is as follows:
Assume that the stoker is being operated and
that coal is being fed through the fuel feed duct
H by the worm l2 into the retort I5 from whence
it passes upwardly within the walls 34 of the
tuyere element. As the fuel passes the outlets
45 and receives air therefrom in the presence of
the heat being generated about same, combus
tion begins fairly close to the center of the
retort and as the burning coals are moved out
wardly by the upwardly fed stream of green
coal, the partially burned coal passes over the 15
element 39 across the intervening space 13 be
tween the elements 39 and 63 which is negligi
bleand across the space 14, which is variable
depending upon the position in which the ele
ment 63 is placed upon the arms 55, after which 20
the almost completely burned fuel moves out;
wardly to the space 15 between the outer ash
ring 58 and the rim 54.
It will be borne in mind that while this is
taking place, the element 39 with its supporting 25
wall 34 and radiating arms 40 are all rotating
due‘ to the action‘ of the worm 21 upon the wheel
26, and that during this rotation, air is passing
to the arms 40 cooling and protecting same and
at the same time affording additional combus 30
tion air to material resting on the ash rings 58
and 63. Obviously, the proportion of air being
delivered through the outlets 45 in relation to
the amount and pressure of air delivered through
the spaces 14 and 15 will vary according to the 35
position of the inner adjustable ash ring 63.
In‘ other words, air is supplied to the burning
fuel close to the center of the combustion zone
and is delivered in annular rings of increasing
diameter toward the outer edge of the combus 40
tion zone, and the amount and pressure of the
air thus delivered may be easily adjusted to suit
the operating conditions.
“
It will also be noted that by providing this >
large burning area, it is less necessary to force
the ?re and it is therefore possible to )avoid tem-' 45
peratures which would otherwise fuse the in
combustibles and thereby produce clinkers which
must either be broken up mechanically or re
moved manually. By the construction above de 50
scribed, clinkers are not formed and the result
ing ash
possible
through
the aid
is of a very fragile nature making it
for it to easily escape downwardly
the spaces 14 and 15 by gravity or with
of the air blown through the arms 48
58 and theouter pqrtion 46 of the element 39
or by an agitation set up through the move- .
and also resting upon the arms 55 is an inner
ment of the arms themselves.
I claim:
1. An underfeed stoker having in combination
adjustable ash ring 63, whose innermost edge
64 is parallel with the outer surface of the por
tion 46 and'is vertically slidable with relation
‘so thereto.
The underside of the ring 63 is provided with
a series of notches 65, 66, 61, 68 and 69 of in
creasing depth making it possible to secure var
65 ious adjustments for the elevation of the inner
a revolvable tuyére section comprising spaced
60
circular inner and outer walls, a retort includ
ing means for discharging fuel upwardly through
the retort into the tuyere section, means for ad
mitting air to the space between the tuyére walls,
the outer tuyere wall having air discharge open 65
ring 63, whose outermost edge 10 is undercut.
ings therein, said revolvable tuyére section hav
The ring- 63 may be adjusted vertically by ro
ing radial arms projecting horizontally from the
top edgethereof, each of said arms having an
air passage communicating with the interior of
the tuyére section and having a discharge open 70
tating same circumferentially until one of the
desired notches 65 to 69 engages its respective
arm 55. It will be noted that the inner edge
64 of the ring 63 extends downwardly sufficiently
far when the ring 63 is in its lowermost posi
15
refractory material ‘II which extends downwardly
tion to coverthe ports formed by the notches 41
and the tuyére wall 24.
vIt is desirable to surround the rim 54 with a
ing on the under side thereof, a stationary ash
ring concentrically spaced from said tuyere sec
tion, a vertically adjustable ash ring disposed
within the space between the tuyere section and
the stationary ash ring, said vertically adjust
3
2,122,807
able ash ring constituting a means for control
ling the flow of air through the outermost tuyere
openings and through the annular space between
said ash rings.
-}
2. An underfeed stoker having in combination
a revolvabletuyere section having a toothed ring
attached thereto, an ash removing worm mesh
ing with said toothed ring, means for driving
said worm, the upper portion of said tuyere sec
10 tion having a cylindrical exterior provided with
air outlets, a vertically adjustable ash ring dis
posed around said cylindrical tuyére portion
adapted in control the flow of air through said
outlets, r. stationary ash ring disposed outside of
15 said vertically adjustable ash ring, the adjacent
edges of said ash rings being beveled in a manner
to vary the clearance between same when said
‘adjustable ring is moved vertically and a retort
disposed under said tuyere section having means
20 for discharging coal upwardly therethrough.
3. An underfeed stoker having in combination
a revolvable tuyére section comprising concentric
spaced inner and outer walls, said tuyere section
having a toothed ring attached thereto, an ash
removing worm meshing with said toothed ring,
means for driving said worm, the upper portion
of said tuyére portion having a cylindrical ex
terior provided with air outlets, a vertically ad
justable ash ring disposed around said cylindrical
30 tuyere portion adapted to control the flow of air
through said outlets, a stationary ash ring dis
posed outside of saidv vertically adjustable ash
ring, the adjacent edges of said ash rings being
4
provided with channels communicating with the
interior of the tuyere section and discharging
downwardly upon said ash rings.
5. A stoker having a retort and means for feed
ing fuel upwardly therethrough, a revolvable cir
cular tuyere section comprising concentrically
spaced inner and outer walls disposed immediately
above the level of the discharge opening of said
retort, the outer side of said tuyere section being
cylindrical and perforated, an annular adjustable 10
ash ring disposed around the cylindrical portion
of said tuyére section constituting a means for
varying the ?ow of air through its perforations, a
stationary ash ring disposed around the adjust
able ash ring and spaced therefrom, a rim sup 15
porting said stationary ash ring and projecting
upwardly therefrom, a toothed ring attached to
said tuyere section and an inclined ash removing
worm meshing with said toothed ring.
6. A stoker having in combination a tuyere sec 20
tion comprising spaced circular inner and outer
walls, the inner walls constituting the upper por
tion of aretort andthe space between the inner
and outer walls constituting an air supply cham
her, said outer ‘wall having air outlets therein, 25
an adjustable ash ring disposed around said outer
wall adapted to be adjusted vertically for the
purpose of controlling the flow of air through
said outlets and means for rotating said inner
and outer walls.
30
7. An underfeed stoker having in combination
a circular revolvable tuyere section having spaced
inner and outer walls, said tuyére section having
beveled in a manner to vary the clearance be
an open underside for the admission of air to the
tween said ash rings when said adjustable ring
is moved vertically and a retort discharging up
wardly into said tuyére section.
4. An underfeed stoker having in combination
a revolvable tuyere section comprising spaced cir
cular inner and outer walls, said tuyere section
having a toothed ring attached thereto, an ash
removing ring meshing with said toothed ring,
means for driving said worm, the upper portion
of said tuyere section having a cylindrical exterior
provided with air outlets, a vertically adjustable
ash ring disposed around said cylindrical tuyere
portion adapted to control the flow of air through
said outlets, a stationary ash ring disposed outside
of said vertical adjustable ash ring, the adjacent
edges of said ash rings being beveled and a plu
space between said walls, said tuyere section hav
ing air discharge openings in its inner and outer
walls, said tuyere section having radial arms pro
jecting horizontally outward from the top edge
rality of radial arms projecting outwardly from
the inner upper edge oi.‘ said tuyere section and
thereof, each of said arms having an air passage
communicating with the interior of the tuyere
section and having a discharge opening on the
underside thereof, a retort discharging upwardly
into said tuyere section, means for feeding fuel
upwardly through the retort, a stationary ash ring
concentrically spaced from said tuyere section
and a vertically adjustable ash ring disposed
within the space between said tuyere section and'
stationary ash ring, said vertically adjustable ash
ring constituting a' means for controlling the ?ow
or air through, the outermost tuyere openings and
through the annular space between said ash rings.
‘
HASKELL C. CARTER.
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