US1647161A - Furnace construction - Google Patents

Description

F. H. WAlTE ET AL.

FURNACE CONSTRUCTION Filed Nov. 2'?, 1925 A TTORNE Y.

Nov. l 1927.

1 647,161 Nov l 1927' F. H. wArrE E'r Al.

FURNACE CONSTRUCTION Filed Nov. 27. 1925 3 Sheets-Sheet2 Nov. 1, 1927.

F. H. WAITE ET Al.`

FURNACE coNs'rRuoTwN Filed Nov. 27, 1925 3 Sheets-Sheet 3 Tr nnkH.Wc1.ic E G E :1 3 EWE mvg] INVENTOR BY @www EL,

dma. ATTORNEY Patented Nov. l, 1927.

UNITED sTATEs FRANK H. WAITE AD GEORGE W. DA'VEY,

Ol' LONG ISLAND CITY, NEW YORK.

FUBNACE CONSTRUCTION.

Application tiled November 27, 1025. Serial No. 71,688.

Our invention relates to furnace wallsiand the circulation of air therein, wherein there are a pluralit of circulations of. air employed in addition to the air su plied by a lower inthe usual way, one o said circulations being through t e front wall directed under the grate of the Stoker and another directed into the smoke box or back of the bridge wall.

Our inventionnot only contemplates the combinations of air circulations by natural or stack draft combined with forced draft,

but a circulation lnduced by an injective action in combination with other circulations directed under the dgrate of a stoker, in addition to ai: supplie by a blower in the usual wa I 'lhis is accomplished by utilizing the heat transfer function of our air cooled furnace blocks, specifically illustrated, described and claimed in our application bear-in Serial Number 55,752, filed September 11t 1925.

We also utilize the horizontal and vertical expansion means illustrated, described and claimed in our pending ap October 15th, 1925, bearing 62630.

One object of our invention is to circulate air in the front wall by stack or natural draft suction in combination with other circulations throughout the side walls and a forced draft means.

Another object of our invention is to circulate air in the front wall by an injcctive action of a forced draft means in combina.

erial Number Vtion with other circulations throughout the side walls and a forced draft means.

Other valuable features of our invention and the unique application of the circulations are described, pointed out and illustrated in the accompanying drawings wherein like numerals indicate like parts, and in which Figure 1 is a longitudinal section ofa water tube boiler stoker furnace.

Figure 2 is a partial front elevation of Fi ure 1.

igurc 3 is a longitudinal section of a water tube boiler stoker furnace illustratingra modification of the invention.

igure 4 is a partial front elevation of Figure 3.

Figure Figure 1.

Figure 6 is a partial plan in section of Figure 3.

5 is a partial plan in section of `driven by the' motor 17 and belt 18 is lication filed Figures 1, 2 and 5 illustrate a water tube boiler furnace consisting of a front wall 1, side walls 2 and 3, bridge wall 4, water tubes 5, a drum 6, an angular balile 7, a vertical baille 8, a gas outlet 9, a clean out o ening 10, a grate 11 the combustion cham er 12, a stoker mechanism 13, a coal hopper 14, a blower or fan 15 and a wind box 16.

There are four separate and distinct circulations of air throughout the furnace, il-

Vlustrated in Figures 1, 2 and 5, two of which circulate through the furnace walls, coolin the interior of the walls or the superimpose broken jointed air cooled blocks that make up the major portion of the furnace lining; and the air preheated in transit throughout the said walls is utilized as a more complete or perfect combustion of the materials of combustion.

In the third or well known forced draft circulation, the air from the blower 15 force into the wind box 16, passes under the ate 11 through the elbow 19, provided with a controlling damper 20, to the combustion chamber 12, through the fuel on the grate 11, thence upwar ly around the tubes 5, drum 6, over bailes 7 downwardly around tubes 5, under baliles 8, upwardly around tubes 5, around drum 6, through the gas outlet 9 to the stack.

In the first circulation illustrated in Fi ures 1, 2 and 5, the air in the front wa baiiied at 25 and 26, enters the horizontal fines 21 of the blocks 22, provided with vertical flues 23, through lnlets 24, each of `which is provided with a' damper 27, having a slide 28 controlling the volume of air entering said inlets.

The air in this front wall 1, preheated .in transit in its downward passage throughout the blocks 22, flowing in a direction oppositeto the flaming gases in the combustlon chamber 12, is directed upwardly under the grate 11 by the elbow 29 and there is a suction induced in this elbow 29 by the forced draft pressure hereinbefore described, which co-operates with the stack ressure or suction in operating this circu ation.

The second aforesaid circulation in reference to Figures 1, 2 and 5 is the circulation throughout the su erimposed, broken jointed walls 2 and 3 bui t up 1n art of air cooled refractory blocks 22, an these walls are provided with horizontal expansion means 30 and 31 and vertical expansion means 32 preheated alr for as well as the 33, 34 35 and tively.

horizontal expansion spaces 36 in walls 2 and 3 respec- The air entering the horizontal tlues 21 of the wall 2 through .llues or ducts 37, each provided with 28 controlling thereto, passes and vertical tlues 21 and 23 a damper 27 having a slide the volume of air admitted throughout the horizontal in the wall 2 1U in a substantially horizontal direction, 'llowtransit throughout said ing at right angles to the flow of flaming gases within the combustion chamber 12,

into the expans as a manifold the reheated a manifold 38 by wall 4.

The air circulating ion space 34 which also acts for all the air preheated in wall, from whence ir is directed into a common the flue 39 within the bridge in wall 3 enters the vertical tlues 21 and 23 reugh a multiplicity of ducts 40, each of which is provided with a damper 27, having a slide 28 controlling the volume of air admitted to each of said ducts 40,

passes in a subs at r1ght angles tantially horizontal direction to the flow of flaming gases within the combustion chamber 12, into the expansion space which acts as a common manifold for said air preheated in transit throughout said blocks 22, from whence the preheated air i s directed into the common manifold 38 for both walls 2 and 3 by the duct or Hue 41.

The preheated air thus collected in the manifold 38 common to both walls 2 and 3,

is directed to flow back of the bridge wall 4 by ducts 42 and 43 of equal area in cross section and duct 44 of a. greater area 1n cross section, from whence it passes upwardly around the tubes 5 and the gas outlet 9 drum 6 through into the stack.

The second circulation is within the wall 2. passing thro ughout the wall within the 3, passing` thro ughout the wall within the 5u ducts 2l and 23 into the common manifold 38 and from thence to the stack as hereinbefore described.

In the fourth circulation the air from the blower 15 is forced into the wind box 16 under the grate 11. directed thereto by the elbow 19 having a volume controlling damper 20, into the combustion chamber 12 from whence it passes upwardly around the tubes 5 and drum 6.

downwardly over baille 7,

o around tubes 5, under baille 8,` upwardly around tubes 5, through gas outlet 9 into stack.

Thus the air preheated in transit throughout the front w bined induced a of the stack is combustion of the tion chamber 12.

e air preheated in transit throughout each side wall is directed into the second or third pass behind the bridge wall and is not utilized in the combustion chamber at all.

In Figures 3, 4 and 6, there are illustrated five dilferent and distinct circulations of air within a furnace, four of which circulate throughout the side and front walls, cooling the interior of the walls or the superimposed broken jointed air cooled refractory blocks that make up, in part, the side walls; and the air preheated in transit throughout the said walls is utilized for more complete combustion of the fuel within the combustion chamber 12.

The fifth circulation is precisely the same as the third hereinbefore described, having similar controlling means and flow.

In the first circulation the air from the blower 15 passes into the wind box 16, under the grate 11, through the elbow 19 provided with a volume controlling damper 20 to the duct and into the common manifold 46 of side wall 3, flowing upwardly in a direction parallel to the llow of flaming gases within the combustion chamber 12, and is directed to llow evenly throughout the wall toward the front wall by the baflles 49, and 51 into an expansion space acting as a common manifold 36 from whence the air tlows in a substantially horizontal direction at right angles to the flow of flaming gases within ,the combustion chamber 12 throughout the horizontal and vertical passages 21 and 23 in the front wall 1, and is directed to How evenly throughout the said wall 1 by the baffles 52 and 60 downwardly into a common manifold 54 from whence the air preheated in transit throughout the said wall of air cooled blocksis directed into a conduit or llue 55 terminating in a reduced end 56 which is centrally located within the elbow 19 in parallel relation thereto and to the flow of air under pressure therein froln fuel within the combus- ,the blower 15;

The air thus preheated is circulated by the injective action of the forced draft from the blower upon thereduced conduit in parallel relation to the blower elbow or un equivalent and the flow of air therein.

A portion of this preheated air flows upwardly through the grate 11 into the comb uston chamber 12 around tubes 5 and drum 6, over baille 7, downwardly around tubes 5 under baille 8, upwardly around tubes 5 and drum 6 into the gas outlet 9 to the stack.

Another portion of this air enters the duct 45 and circulates throughout the walls 3 and 1 as hereinbefore described, continues to circulate in this cycle and composee the second circulation..

In the third circulation the air from the blower passes into the wind box 16, under` 'the `grate 11, through the elbow 19 provided 'with a volume controlling 'damper 20 into the commonmanifold 48 of the side wall 2 by the duct 47, flowin upwardly in a d1- rection parallel to theV ow of iaming gases within the combustion chamber 12, and .is directed to flow evenlyl1 throughout the wall toward the front wal by the bafiles 57, 58 yand 59 into an expansion space actin as a common manifold 33 from whence t e air .passages out through the rear of said wall,

flows in a substantially horizontal direction at right angles to the `flow of flaming gases Within the combustion chamber 12 throughout the horizontal and vertical passages 21 and 23 in the front wall 1, and is directed to flow evenly throughoutthe said wall 1 by the baliles 53 and 60, downwardly into a common manifold 54, from whence the air preheated in transit throughout the said Walls of air cooled blocks is directed into a conduit or flue 55, terminating in a reduced end 56 which is centrally located within the elbow 19 in parallel relation thereto and to the ilow of air under pressure therein from the blower 15.

The air thus preheated is circulated by the `injective action as hereinbefore described in the first circulation and likewise a portion of this air passes throughout the furnace in a like manner and this constitutes the third circulation.

TheV fourth circulation is one similar to the second only in wall 2 and 1 entering manifold 48 through the duct 47.

In the fifth circulation the air from the blower passes into the wind box 16 under the grate 11 through the elbow 19 having a volume controlling damper 20, through the rate 11 and the fuel thereon into the comustion chamber 12, upwardly and around tubes 5 and drum 6, downwardly over baf-` fles 7, around tubes 5 under baflies 8, upwardly around tubes 5 and drum 6 into gas outlet 9 to stack.

The side Walls are provided with horizontal expansion means and 3l, vertical expansion means 32 and horizontal expansion spaces 33, 34, 35 and 36.

Having thus described and illustrated the preferred embodiment of our invention we do not (lesite to limit ourselves to the exact subject matter pertaining to the s eciic circulations and combination thereo as modifications may be made without departing from the spirit of the invention or the scope of the claims.

We claim 1. In a furnace structure, the combination ofrefractory front and side walls having air passa es therein, a Stoker grate in the furnace c amber, an outlet for the lproducts of combustion in an upper part of t e chamber,

a bridge `wall having air passages therein,

baille means directingthe products of combustion from the outlet across and back of the bridge wall, ports from the bridge wall air feeding means below the grate, air inlet means to the front wall passa es, air con ducting means leading from sai passages to a point beneath the grate within the influence ofthe air from said feeding means, air mlets for the side wall passages, and a communicating duct between the passages of eacll side wall and the passages of the bridge wa 2. In a furnace structure, the combination of refractory walls composed of blocks havin air assages therein, said walls substantia ly efining the combustion chamber, means for admitting fuel to said chamber, an oii'take for the products of combustion, air inlets to the passages' of a wall, air ports from the passages of another wall into the furnace chamber, and a combined air duct and expansion space for the refractory blocks said slot duct connecting the passages ofthe wall having inlets to the passages of the wall having ports into the chamber.

3. The combination with a furnace having refractory front and side Walls, a grate, means for feeding fuel, air feeder means, and an otake for the products of combustion ;4 of air assages in the walls, baille means in the ront wall dividing said passages nito a plurality of circulatory systems, bales in the side walls spaced to distribute uniformly the' air flowing through said walls, air inlet means to said side wall passages opening under the grate and adapted to receive air from the feeder, and air outlet .means from the front wall passages positioned in the flow of air from the feeder to deliver heated air beneath the grate.

Signed at Long Island City in the count of Queens and State of New York this 24th day of November A. D. 1925.

FRANK H. WAITE. GEORGE W. DAVEY.

i -common manifold 33 the 'grate 11,

'and 23 in the front wall- 1,

nemici In the'third circulation'the air from the .blower 15 passes into the wind box 16, under,v

'with a volume controlling 'damper 20 into the common, manifo1d48`ofthe side wall 2 by the duct 47, ilowin upwardly in a d1- rectionparallel to the, ow of flaming gases within the' combustion, chamber 12, .and .1s directed to flow 'everlly throughout the wall toward the front w by the bailile's 57, 58 and59 into an expansion space 'actin as a from whence ows in a substantially horizontal direction at right angles to the 'flow of ilaminggases within the co bustion chamber 12 throughout the horizontal and vertical passages 21 and is 'directed to flow evenly throughout-the said wall 1 by the baiiies 53 and 6O-downwardlyr into a common ymanifold 54, from whence the air preheated in transit .throughout the said walls ofair cooled-'blocks is directed into a conduit or flue 55, terminating in a reduced end 56'which is centrally located within the elbow 19 in parallel relation thereto and to the flow of airunder pressure therein from the blower 15.- 4

The air thus preheated is circulated by the injective action as the irstl circulation and likewise a portion of this air passes throughout the furnace in a like mannerandthis constitutes the third circulation..

The fourth circulation lis one similar -to the second only in wall 2 'and 1 entering manifold 48- through the duct'li'?.

In the fifth circulation the air from the blowerpasses nto`the wind box, 16 under the grate 11 through the elbow 19 having a volume controlling damper 20, through the rate 11 and the fuel thereon into the comustion chamber 12, upwardly and around tubes 5 and drum 6, downwardly over baffles 7, around tubes 5 under baies 8, upwardly around tubes 5 and drum 6 into gas outlet 9 to stack. i

The side wallsl are provided with horizontal expansion means and 31, vertical Pexpension means 32 and horizontal expansion spaces 33, 34, 35 and 36.

Having thus described and illustratedthe preferred embodiment 'of our invention we do not desire vto limit ourselves to theiexact subject matter pertaining to the s eciic circulations and combination thereo as modifications may be made without departing through the. elbow 19 provided,

. passa nace c amber,

e air .passages o ut through the rear o'f said wall,

hereinbefore described in 1. In a Vfurnace structure, the combination ofrefractory front and side walls having air es therein, ,a stoker grate in'the furau outlet for the lproducts of combustion in an upper part of t e chamber,

,a bridgewall having air lpassages therein,

baemeans directing theproducts of combustion from the outlet across and back of the bridge wall, ports fromthe bridge wall air feeding means below the grate,v air inlet means to the frontwall passa es, air conducting means leading4 from sai passages to a point beneath Y ence ofthe air from saidfeeding means, air inlets for 'the side wall passages, and a communicating 'duct between the passages of eacll side wall and the passages of the bridge wa l 2. In a furnace structure, the combination of refractory walls composed of blocks having air assages therein, said walls substantially efining the combustion chamber, means for admittingdfuel to said chamber, an oitake for the pro ucts of combustion, air inlets to the passages' of a wall, air ports 4from the passages of another -wall into the means inthe ront wall dividing said passages ii'ito a plurality of circulatory systems, badles 1n the side walls spaced to distribute un1formly the' airy flowing through said walls, air inlet means to said 'side wall passages opening u'nderthe grate and adapted to receive air 'from' the feeder, and air outlet :means from the front wall passages positioned 1n the iiow of air from the feeder to deliver heated air beneath thegrate.

Signed at Long Island City in the count `of Queens and State of New York this 24h 4day of November A. D. 1925.

' FRANK H. WAITE..

GEORGE W. DAVEY.

Certillcate of Correction.

Patent N o. 1,647,161.

Granted November 1, 1927, to

FRANK H. WAITE ET AL.

lt is hereby certified that error` appears in the numbered patent requiring correction as follows:

said Letters Patent should bere-ad with this co1'- {Iirnted specification of the abovea e 3, line 89, claim 2, strike out rection therein that the'same vmay conform to the record of the case in the Patent Oiiice.

Signed and sealed this 6th l'snAnl day of December, A. D. 1927.

M. J. MOORE,

i from the spirit4 of the invention or the scope of the claims.4 We claim the grate within'ithe inilu- Certicate of Correction.

Patent No. 1,647,161. Granted November l, 1927, to FRANK H. VVAITE ET AL.

It, is hereby certified that error appears in the grim-ed specification of the abovenumbered patent requiring correction as follows: age 3, line 89, claim 2, strike out the wurd slot"; and that the said Letters Patent should be read with this correction therein that thesame may conform to the record of the case in the Patent Office.

Signed and sealed this 6th day of December, A. D. 1927.

[smh] M. J. MOORE,

Acting Commissioner of Patents.

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