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Патент USA US2111928

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March 22, 1938.
2,111,928
R. M. HARDGROVE
FU EL BURNER
. Fi'led Aug. 20, 1929
4 Sheets-Sheet 1
FIGl.
t
March 22, 1938.
'
R. M. HARDGROVE
I
FUEL
2,111,928‘
BURNER
Fil-ed Aug. 20, 1929
4 Sheets-Sheet 2
BY
ATTOR N EY
March 22, 1938.
R, M, HARDGROVE
2,111,92@
FUEL BURNER
Filed Aug. 20, 1929
4 Sheets-Sheet Z
March 22, 193%.
'
M. HARDGROVE
2,131,928
FUEL BURNER
Filed Aug. 20, 1929
‘4 sheets-sheet 4
2,111,928
Patented Mar. 22,v 1938
‘UNITED’ STATES
PATENT. OFFICE *
2,111,928
1
FUEL BURNER
. Ralph M. Hardgrove, Bethlehem, Pa., assignor,
by mesne assignments, to ThevBabcock &
Wilcox Company, Newark, N. 3., a corpora
tion of New Jersey
.
I
‘
Application August 20, 1929, Serial No. 387,214 __
24 Claims. (Cl. 122-235)
This [invention relates to a burner that is espe
cially useful for burning’ pulverized coal. The
invention will be understood from the description
in connection with the accompanying drawings,
5 in which Fig. 1 is a vertical section through an
illustrative embodiment of the invention; Fig. 2
is a partial rear view of the structure shown in Fig.
outlet walls 9 to form a series of transversely
spaced‘ vertically elongated nozzles discharging
through the intertube spaces.
Inlets l0 and II are provided above and below
the outlet 8 for secondary or combustion air.
Each air inlet I l is shown ‘to be of greater vertical
cross sectional area and height than the inlet l0
1; Fig. 3 is a plan view, partly in section, showing
the burner; Fig. 4 is a plan view of one of the
10 details; Fig. 5 is a section along the line 5-5 of
Fig. 4; Fig. 6 is a section along the line 6-8 of
Fig. 5; Fig. '7 is a perspective view partly in sec
tion of thefuel burner with the de?ector blocks
and some of the wall tubes omitted; and Fig. 8
15 is a horizontal section showing the relative ar
rangement of the de?ector blocks and tubes. /
In- the drawings, reference character I indi
cates a furnace having vertically disposed spaced
thereabove.
-
.
'
I
Angle-irons‘ I2 and I3 extend along the outside
of the furnace wall and are connected to brackets 10
14 on the burner 5 by means of rods l5 that are
provided with turn buckles l5’.
~
.
.
A row of de?ecting blocks I6 is provided along
the furnace side of the tubes 2 opposite the out
let 8. These blocks l6 may be held in-place 15
against the tubes 2 by means of 'U-bolts H which
?t around the shields 8a. The blocks l6 are prm
vided with curved surfaces l8 to ?t against the
tubes-and with countersunk openings IQ for nuts
on the ends of the U-bolts II. The front sides of 20
the blocks It or the sides toward the burner 5 are
rounded, as indicated at 20, to divide each ver
‘ tubes 2 in its wall. The tubes 2 have their ends
connected to a header 3 outside of the furnace.
20
_ ‘The tubes may have water or other cooling fluid
circulated through them in the well-known way.
The tubes are lined with blocks 4 to provide a tically elongted stream of incoming fuel and pro- 1
ject it in two sheets, one inclined upwardly and.
continuous wall. Some of the blocks 4 are vomit
tedv to provide a location for the fuel burner. The the‘ other downwardly,-so that these sheets of fuel 25
, willbe struck by the air entering through the
fuel burner has a long narrow mouth or exit
opening which extends across a plurality of the ports 10 and II substantially at right-angles.
Plates 2| and 22 are attached to the outlet 8
tubes, so that fuel from the burner passes into
the furnace through a number, of spaces between to de?ne one side of each inlet l0 and II. A
the‘ tubes 2.
30
v
.
p
>
The burner 5 is connected to a ?aring connec
tion 6, which is in turn connected with a fuel
'delivery pipe 6“. The burner 5 is disposed at an
angle to the fuel delivery pipe 6“, and the ?aring
connection joining the burner and the fuel de
livery pipe is provided with a sloping wall 1
against which the mixture of air and powdered
damper 23, somewhat conventionally shown in
Fig. l of the drawings, is pivoted at 24 to the
bracket 25 above the plate 21 and a loose damper
26 is pivotally attached at 21 to a bell crank 28
pivoted at 29. The damper 2,6 in its full open
position rests upon a supporting plate 25“, against '
which thelower portion ofthe damper continu
ously contacts when the damper is turned by the
fuel from any-convenient source impinges so that bell crank 28. ‘Rods 30 are provided for operating
the mixture will spread out laterally substantially . the dampers 23 and, 26, so that the inlets Ill and
40
uniformly in the horizontally extending portion
of the burner 5. The sloping wall 1 stands at an
angle to- the axes of the fuel delivery pipe and the
burner, as will be realized upon. examination of '
Figure -1. An’ outlet 8 is connected to the exit end
of the burner 5 and may be attached to the tubes
40
H can be partially or entirely closed.
casing 3| surrounds the burner and dampers
.and may be supplied with air under pressure in
any convenient way. A port 32 for a lighter may
extend through the casing 3| into proximity to‘
the outlet 8 for lighting‘- the fuel.
45.
The burner extends laterally and converges in
a vertical plane and ?are_s,_-horizontally toward
across a numberof the tubes and is provided‘ with ' ' the
outlet 8, thus causing the-incoming mixture
outwardly ?aring upper and lower walls 9. Each
'of
air-and
fuel to spread out horizontally in a
vof ‘the tubes 2 has itsouter side contacting with
thin
sheet.
’ The sheet is divided by the fuel
the concave side of a crescent shaped shield 8*, ’ nozzles formed
in the outlet section 8 into a row
as shown in Fig. 3, the upper and lower edges of
which fit into recesses formed in the upper and of horizontally spaced vertically‘ elongated fuel
'1 lower walls 9 of the burner outlett, as shown in streams, each of which strikes‘a corresponding
Fig. 1. With this arrangement-‘of the shields 8‘ vde?ector block l8 and passes in twoportions in
in the burner outlet 8, the shields unite with‘ the such directions that the streams of air entering
‘ 2 in any convenient manner. The outlet 8 extends
‘
I
_
_ 55
2
2,111,928
through the inlets I0 and II are struck substan
tially at right-angles, thus intimately mixing the
fuel and combustion air. In this way, prac
tically the entire volume of the furnace can be
8. In a furnace, a wall, vertically disposed cool
ing tubes in said wall, a horizontally elongated
fuel nozzle extending across a plurality of said
tubes and a de?ector block mounted on two ad—
.iacent tubes on the furnace side of said fuel u
. A series of blocks 33 form a drip ledge posi
tioned above the upper secondary air inlet in, 1 nozzle.
that is to say, over the secondary air-ports and
9. In combination, a pulverized‘ fuel and air de
fuel outlets. The blocks 33 are held in place livery pipe, a fuel burner nozzle arranged at an
by being fastened to the cooling tubes 2 in the , angle to said delivery pipe, a conduit section con
utilized very effectively for combustion.
wall. The function of this drip ledge is to pre
vent clogging of the ports by liquid ash or slag
which may ?ow down the wall from above the
ports.
15
I claim:
1. In combination, a furnace having vertically
disposed tubes along a wall thereof, a burner
having a narrow exit opening extending across
20 a plurality of said tubes, and a de?ector in
front of said opening, said de?ector being at
tached to said tubes.
‘
‘
>
‘
2. In combination. a furnace having vertically
disposed tubes along a wall thereof, a burner hav
25 ing an exit opening extending across a plurality
of the wall tubes, a secondary air conduit also
extending across a plurality of the wall tubes, and
a de?ector in front of the exit opening of said
burner, said de?ector being attached to the wall
necting said delivery pipe and nozzle and. com
prising a fuel distributing plate arranged at an 10
angle to the axes of said delivery pipe and nozzle
to receive the impact of the fuel from said deliv
ery pipe and distribute the fuel therefrom
throughout said nozzle, said nozzle having an
outer section progressively ?aring in one direc
tion and progressively tapering in a transverse
directionfrom the discharge end of said con~
necting conduit section, and a nozzle discharge
section ?aring towards its discharge end in a 20
direction transverse to the direction of ?are of
said outer nozzle section.
10. In combination, a furnace wall having a
fuel burner port formed therein, a fuel burner
nozzle arranged to discharge fuel through said 25
burner port in a series of streams extending
transversely of the direction of fuel discharge,
means at the inner side of said furnace wall and
tubes, and serving to direct the fuel into the
30 secondary
air.
immediately beyond the discharge end of said
3. In combination, a furnace having vertically
disposed tubes along a wall thereof, a burner
nozzle for dividing each fuel stream into a plu
rality of streams diverging in a plane transverse
ly of theseries of fuel streams, and means for
35 rality of wall tubes, means to cause streams of
discharging a stream of ‘combustion air through
said burner port into each of said diverging fuel
streams.
air to enter said furnace along opposite sides of
said burner in angular‘ relation thereto,‘ and
40
angle to said air streams.
4. In combination, a furnace having vertically
11. In combination, a furnace wall having a
fuel burner port formed therein and spaced cool
ing tubes extending across said burner port, a
fuel burner nozzle arranged to discharge a fuel
?aring in a horizontal plane toward its exit end
extending across a plurality of the wall tubes and
versely of the length of said cooling tubes, de?ec
tors mounted on‘ and extending across the spaces
35
disposed cooling tubes in a wall thereof, a burner _ stream through said burner port elongated trans
between said/ tubes and immediately beyond the
discharge end of said nozzle for dividing the fuel
being mounted on and in ther
mal contact with said tubes.
5. In combination, a furnace having vertically
disposed cooling tubes in a wall thereof, a burner
?aring in a horizontal plane toward its exit end,
agsecondary air conduit having an opening ad
jacent the exit end of said burner, and means for
‘stream passing through the intertube spaces into
a plurality of streams diverging in a plane trans
versely of the direction of elongation of the main
fuel stream, and means for discharging‘streams
of combustion air through each of said intertube
spaces into said diverging fuel streams.
12. In a furnace, a substantially vertical wall
50
having a fuel burner
over a plurality of
being mounted on
the tubes.
60
6. In combination, a furnace having vertically
a wall‘v thereof, a
said burner port and fuel burner by solid deposits
from above.
60
13. In combination
tubes, and means to cause secondary combustion
air to mix with material from said burner after
it has struck said de?ector.
7. In a furnace, a wall, vertically disposed cool
ing tubes in said wall, a horizontally elongated
fuel nozzle extending across a plurality of said
tubes, a secondary air-port adjacent said fuel
65
70
nozzle vsubstantially‘ coextensive therewith, and a
drip ledge block in said wall over said fuel nozzle
75 and saidlsecondary air-port. _
75
8,111,928
14. In a burner for pulverized fuel, a single
fuel distribution conduit terminating in a plu
rality of fuel nozzles spaced along a furnace wall.
means forming a plurality of downwardly in
clined ainpassages located above said nozzles
and means forming‘ a plurality of upwardly in
clined air passages located below said nozzles
stream closely adjacent its; point of entry into
the furnace.
'
I \ '
_'
'
V
- ‘19. In combination, a furnace wall including
a series of transversely spaced wall tubes, a series
of transversely spaced pulverized fuel nozzles
adjacent said wall tubes and constructedv to dis
charge a plurality of fuel-streams through sep
whereby the air jets‘ discharged therefrom are arate intertube spaces at an oblique angle to said
caused to impinge upon the fuel Jets discharged ‘furnace wall, and means for directing streams of
combustion air through said intertube spaces at
10 from said nozzles, and means at the discharge an oblique angle to said furnace wall and in a
end of said air passages for selectively controlling
I‘ the velocity of air discharged ‘from said upper direction to impinge upon corresponding fuel
streams adjacent said furnace wall.
and lower air passages without changing the ini
20. In combination, a vertically extending fur;
tial point ofimpingement of said air. streams on '
nace- wall having a burner'port formed therein 15
~
.
,
I
15 said fueljets'. ,_
15. In combination, a furnace wall comprising and a series ‘of transversely spaced wall tubes
extending across said burner port, a combustion
air casing at the outer side of said furnace wall
wall and comprising a ?ared fuel conduit having and surrounding said burner port, a series of
transversely spaced pulverized fuel nozzles ‘ad
20 its discharge end extending transversely across jacent said wall tubes and constructed to dis
the outer side of a plurality of said wall tubes
charge a plurality of fuel streams through sep
and terminating in a series of separate fuel noz
zles, said nozzles being spaced apart and ar - arate intertube spaces, and means for directing
streams of combustion air from said casing
ranged to discharge‘ fuel through separate inter
through said intertube spaces at an oblique an 25
tube
spaces
at‘
an-oblique
angle
to
said
furnace
25
wall, and means forming an air passage through gle to said furnace wall and in a direction to im
each of said intertube spaces directed towards pinge upon corresponding fuel streams adjacent
said furnace wall.
'
and adjacent to the discharge end of the corre
21. In combination, a vertically extending fur
sponding fuel nozzle.
,
_
nace wall having a burner port formed therein 30'
16. In combination, a vertically extending fur
30
nace wall having a series of horizontally spaced and a series of transversely spaced wail tubes
cooling tubes extending along its inner side, a extending across said burner port, a combus
pulverized fuel burner adapted to discharge tion air casing ‘at the outer side ‘of said furnace
through said wall and comprising a ?ared fuel wall and surrounding said ‘burner port, a pul
verized fuel conduit extending through said cas :35
35 conduit having its discharge end extending trans
versely across a plurality of said wall tubes and ing and having its discharge endv extending trans
terminating in a series of separate vertically versely across the outer side of a plurality of _
said wall tubes, said conduit terminating in a
elongated fuel nozzles, said nozzles being hori
a series of horizontally spaced cooling tubes, a
fuel burner adapted .to\ discharge through said
zontally spaced apart and arranged to discharge
series of transversely spaced fuel nozzles adja
‘ wall tubes and constructed to discharge a plu
fuel conduit extending through said casing and
having its discharge end extending transversely
cent said wall tubes and constructed to discharge 40.
40 a mixture of pulverized fuel and primary air
through separate intertube spaces, and means a plurality of fuel streams through separate 'in
for directing a stream of secondary air through tertube spaces, and means for directing streams
each of said intertube spaces at an angle to ‘ of combustion air from said casing through said
wards and impinging on, the corresponding fuel intertube spaces in a direction‘ to impinge upon
and primary ‘air stream adjacent said furnace corresponding fuel streams adjacent said furnace
wall.
'
wall.
22. In, combination, a vertically extending fur- v
1'7; In combination, a vertically extending fur
nace wall having a series of horizontally spaced nace wall having a burner port formed therein
vertically arranged cooling tubes, a fuel burner and a series of transversely spaced wall tubes
extending across said burner port, a combustion so
adapted to discharge through said wall and com
air casing at the outer side of said furnace wall
' prising a fuel conduit having its discharge end
and
surrounding said burner port, a pulverized
extending transversely across a plurality of said
rality of fuel streams through separate intertube
spaces at an oblique angle to said furnace wall,
across the outer side of a plurality of said wall 55
tubes, said conduit terminating in a series of
and means for directing a stream of air through '
each of said intertube spaces at an oblique angle
to said furnace wall and in a direction to im
pinge upon the corresponding fuel stream.
18. In combination, a furnace wall having a
‘ so
series of horizontally spaced cooling tubes asso
ciated therewith, a fuel burner adapted to dis
charge through said wall and comprising a fuel
‘conduit having its discharge end extending trans
versely across a'plurality of said wall tubes and
constructed to‘ discharge a plurality of separate
fuel streams through separate intertube spaces
with some of saidvfuel streams directed at one
oblique angle .to said wall and other, fuel streams
at a substantially opposite oblique angle to said
wall, and means for directing a stream of air
1
transversely spaced fuel nozzles adjacent said
wall tubes and constructed to discharge a-plu
rality of fuel streams through separate intertubev
spaces at an oblique angle to said furnace wall,
so
and means for directing streams of combustion
air from said casing through said intertube spaces
in a direction to impinge upon corresponding
fuel streams adjacent said furnace wall.
23. In'combination, a furnace having a verti~~ 65
cally extending wall, a series of pulverized fuel
nozzles constructed to discharge a plurality of
fuel streams through said wall with some of
said fuel streams entering the furnace at an'
upward inclination to said wall and other-fuel 70
streams at a downward inclination to said wall,
means forming a plurality of downwardly ‘in-.
through each of said intertube spaces at an clined air passages located above ‘said nozzles '
,. oblique angle to said furnace wall and ina direc- - and arranged to direct streams of combustion air '
' 75
tion to, impinge upon the corresponding fuel
to impinge upon corresponding upwardly inclined
4
9,11 1,988
fuel streems, and means forming a plurality of
' upwardly inclined air passages located below said
nozzles and arranged to direct stre ams of com-'
bustion air to impinge upon corresponding down
Cl wardly inclined fuel streams.
'
2%. In a furnaoe, a, wall, vertically‘ disposed
cooling tubes in said well, a honzontally elon
'
gated fuel nozzle extending across a plurality
of said tubes and air-ports aboveand below said
fuel nozzle, the air-port below said fuel nozzle
being of greater area than that above said, fuel
nozzle.
RALPH m HARDGROVE.
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