US1646944A - Furnace wall - Google Patents

Description

3 Sheets-Sheet 1 BY @M a.. @(5441 ATTORNEY.

F. H. wAlfTE ET AL FURNACE WALL med sept. 29, 1925 Oct.` 25 1927.

Oct. 25,1927. 1,646.944

F. H. WAlTE ET AL FURNACE WALL Filed Sept. 29, 1925 3 Sheets-Sheet 2 1 NV EN TOR- A TT ORN E Y.

v` mmm-Imam Oct. 25,` 1927.

F. H. WAlTE ET AL F FURNACE WALL Filed Sept. 29, 1925 3 Sheets-Sheet 3 ATTORNEY UNITED STATES PATENT OFFICE.

FRANK H. WAITE .AND GEORGE W. DAVEY, OF LONG ISLAND CITY, NEW YORK.

FURNACE WALL.

Application filed September 29, 1925.

Our invention relates to furnace walls and the method of circulating air therein whereby two distinct circulations are employed,

' -iach of which is actuated by the suction, or the pressure, of a blower or fan and the air preheated in transit through the air cooled blocks in the furnace walls is passed under the grate of a Stoker and the invention is particularly useful in connection with stoker furinicef; or their equivalent.

This accomplished by utilizing the heat transfer function of our air cooled furnace blocks specifically illustrated, described and claimed in our application bearing Serial l5 Number 55,752, filed September 11th, 1925.

The object of our invention is to circulate air in the furnace walls horizontally in the front wall and downwardly in the side walls` flowing the air against the flow of flaming gases in the combustion chamber and utilizing this air thus preheated in transit therethrough for making a more perfect combustion of the fuel therein.

Other valuable features of our invention are hereinafter pointed out, described and illustrated in the accompanying drawings, wherein like numerals indicate like parts throughout the several views, in which z- Figure 1 is a horizontal section ofa water tube boiler furnace employing a stoker or the like.

Figure 2 is a front elevation clearly illustrating the circulation and details not shown in Figure 1.

Figure 3 is a longitudinal section of a water tube boiler furnace employing a stoker or the like, illustrating a modification of the invention.

Figure 4 is a front elevation clearly illustrating the circulation and details not shown in Figure 3.

Figure 5 is a plan view in section of a part of the furnace snown in Figure 1 and typical for Figures 1, 2, 3 and 4.

Figure 6 is an enlarged section of a detail of the furnace wall. n Figures 1 and 2 illustrate a water tube boiler furnace consisting of a front wall 1, side walls 2 and 3, bridge wall 4t, water tubes 5, an angular baflie 7, a vertical baffle 8, a gas outlet 9, a clean out opening 10, a. grate 11, a stoker mechanism 13, a coal hopper 14, a blower 15 and a wind box 16.

The air as shown by Figures 1 and 2, is admitted into each half of the front wall 1, which is provided with a vertical baille 17,

Serial No. 59,440.

through a multiple of ducts or flues 18, each provided with a damper 19 and slide 20.

The air then passes into the horizontal iiues 21, and vertical liues 22 of the air cooled blocks 23, flows in a horizontal direction throughout` one half of the front wall toward the side wall 2, into a common duct or header 32, enters the said side wall as shown by Figures 1, 2 and 5 provided with the horizontal baiiles 2st and 25, liows downwardly throughout the side wall into a manifold or header 26, from whence it is drawn or sucked by the blower 15, through' the pipe or conduit 27 into the inlet side of said blower.

This air preheated in transit throughout the walls is forced by the blower into a wind box or air duct 16, passes through a pipe or conduit 28, provided with a regulatmg damper 29, under the grate 11 of the Stoker, flows upwardly through the grate and the products of combustion carried thereon into the combustion chamber 12 where combustion takes place and the gases pass upwardly around the water tubes 5, over baffles 7, downwardly under battles 8, then upwardly into the gas outlet 9 to the stack.

The air on the other half of the front wall l, enters in a similar way as in the opposite half into a common duct or header 33, flows throughout the opposite side wall downwardly into the manifold or header 26 and is finally utilized as hereinbefore mentioned.

The two distinct and separate circulations of air, as aforesaid, flowing through the front wall 1, at right angles to the flaming gases in the combustion chamber, and through the side walls 2 and 3, in a direction opposite to the flow of said gases, enters into the common header 26, after having cooled the air cooled blocks 23, is preheated in transit and the preheated air thus obtained is sucked or drawn by the blower 15, driven by the belt 30 and motor 31, blown or forced under the grate of the Stoker or any equivalent and utilized for making a more complete combustion of the products of combustion in the combustion chamber 12 of the furnace.

Figures 3 and 4 illustrate two different circulations of air actuated by the pressure of a blower 15. rThe air from the blower 15 passes into the wind box 16, to the conduit or pipe 34 where it divides at 38, one crculation passing into the common duct or manifold 36, enters into the multiplicity of ducts 18, each of the inlets to said ducts being provided with a controlling damper 20, passes horizontally throughout the front wall, is directed toward the side wall 2 into a common duct 32, shown in Figure 5, from whence it passes downwardly throughout the side wall 2, provided with horizontal baiiles 24, 25 and 35, passes under the grate ll, through a multiplicity of flues or inlets 39, through the grate l1 with the products of combustion thereon, into the' combustion chamber l2 where combustion takes place, and as hereinbefore mentioned, to the stack. The other circulation starting from the blower l5, passes under pressure of the blower into the wind box 16, to the conduit 34, the Y 38, common manifold 37, throughout the opposite half of the front wall in a horizontal direction into the common header or duct 33, shown in Figure 5, throughout the side wall 3, provided with similar bailes 24, 25-and 35 as shown by Figure 3, through fines 39, under grate ll, through the products of combustion thereon into the combustion chamber l2 and finally to the stack 'as hereinbefore mentioned. A

As there is considerable difference in the expansion of iirebrick and the air cooled blocks, means are provided to take care of this difference, clearly shown in Figures l, 2 3', 4. 5 and 6.

rlhe front walls are provided with eXpansion space at 32 and 33, special air cooled expansion blocks, indicatedin Figures 2 and 4 at 39 and 40, which take care of the horizontal expansion, and a space 4l preferably filled with asbestos or an equivalent to take care of the vertical difference of expansion.

'lhe'side walls are provided with eXpansion spaces at 42 clearly shown in Figure 5, special air cooled expansion blocks indicated in Figures l and 3 at 43 which take care of the horizontal expansion, and a space 44 preferably filled with asbestos or an equivalent to take care ofthe vertical expansion.

Either or both the front and sidewalls may be built up as shown in Figure 6, wherein the air cooled blocks 23, with the horizontal lines 2l and vertical flues 22 are bonded into the wall, assumed for the sake of illustration to be front wall l, by the bonding bricks 45 which are integral with the wall l, or built up either of red or tirebrick 462 or both.

The spaces between the iirebrick 46 may be filled with cement as shown in Figure 6 by 47, and the space between the air cooled locks 23 by the cement 43 to take care of the vertical difference in expansion between the tirebrick 46 and the air cooled blocks 23, the air cooled blocks being moulded, to form upon the completion of the wall, an expansion space 4l) which is filled with asbestos or an equivalent.

Having thus described and illustrated the preferred embodiment of our invention, we de not desire to limit ourselves to the exact subject matter pertaining to the specilic circulations and construction disclosed herein, as modifications may be made without departing from the spirit of the invention or the scope of the claim.

`We claim A. furnace construction including, in combination, a front wall, side walls and a rear wall, substantially defining the combustion space; a grate and stoker mechanism therebelow; blower means for forcing a draft through said grate; an oil'take at the top of the chamber for the products of combustion; intersecting horizontal and vertical air passages in said front wall with a substantially vertical baille therein dividing said passages into two circulating systems; intersecting horizontal and vertical air passages in the side walls, each of said walls having a plurality of vertically spaced substantially horizontal battles therein extending rearwardly, the baf'les being progressively longer towards the top of the wall; air inlets to the passages of the front wall on each side of the vertical battle; ducts connecting the passages of each system in the front wall to the passages in the respective side walls; means connecting the blower with the passages in the walls to cause a current of air to How therethrough; and air conducting means conveying the heated air underneath the grate, for admission therethrough into the fuel bed.

Signed at Long Island City in the county of Queens and State of New York this 28th day of September, A. D. 1925.

FRANK H. VVAITE. GEORGE lV. DAVEY.

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