US1753842A - Furnace construction - Google Patents

Description

April 8, 1930. F, wAlTE ET Al.

FURNACE CONSTRUCTION Filed Nov. 13, 1925 4 Sheets-Sheet .dmw, j; and@ 'F'r 5.11.12. H NN'D. jc E EEmLEEVvCDm- Ej IN VEN TORS on 3y M A TTORNE Y April 8, 1930. F. H. wAlTE ET AL 1,753,842

FURNACE CONSTRUCT ION Zwaan/grs M75/m15:

Filed Nov. 13. 1.925 4 sngts-sheet md.. h

EEDYEEWDDN' INVENTORS 'y- CWM ATTORNEY April 8, 193Q. H wAlTE ET AL 1,753,842

FURNACE CONSTRUCTION Filed Nov. 13, 1925 4 Sheets-Sheet 4 i ATTORNEY Patentedv Apr. 8,Y 1930 1 UNITED STATES vPATENT OFFICE FRANK H. AND' GEORGE DAVEY, 0F LONG/ISLAND CITY, NESW 'YORK FURNACE CONSTRUCTION l Application filed November 13, 1925. Serial No. 68,87'8.

Our invention relates to furnace construct1on, and contemplates the provision of simple and efficient means for preheatingair yfor combustion and'delivering it to the furnace,

5 while at the same time protecting the refractories. By our construction there are a plurality of co-oper-ating although separate ,and distinct circulations of air employed in addition to theair supplied by a `blower in the usual way, two of the circulationsbeing directed throughout the side walls into the combustion chamber and a third circulation throughout the air cooledV arch entering the throat of the furnace. Y Y l5 This is accomplished by utilizing the heat transfer function of our air cooled refractory furnace blocks, specifically illustrated, described and claimed in our application bearing Serial Number 55,7 52,l led September 11th, 1925. 1

We also utilize the horizontal and vertical expansion means illustrated, described and claimed in our pending applications, led- September 29th, 1925, bearing Serial Number 59,440 and in the application filed. October 15th, 1925, bearing Serial Number 62,630. One object of our invention is to circulate air under pressure throughout the side walls of a stoker furnaceand force the preheated 30 air into the combustion chamber adjacent to the stoker grate and simultaneously circulate air through an air cooled arch.

Another object of our invention is to cirlculate air under pressure throughout the side walls of a stoker furnace by the suction of al blower or fan and force this preheated' air under the grate of a stoker into and through'- out the combustion chamber,- simultaneously forcing air throughout an arch into the throat 40 of the said furnace.

Other valuable features of our invention and the unique applications of the circula` tions are described, pointed out and illustrated in the accompanying drawings, where- 5 in like numerals indicate like parts, in

which v Figure l'is a longitudinal section of a water tube boiler Stoker furnace.

Figure 2 is a cross section on the line 2-2 5 of Figure 1. f f

vFigure 3 is a typical section of part of the wall adjacent to the grate and taken onthe line 3-3 of Fig. l.

Figure 4 is a longitudinal section of a water tubeboiler stoker furnace illustrating a modication.

Figure 5 is a cross section on the line 5-5 of Figure 4.

Figure 6 is a partial horizontal section 'on line 6-6 of Figure 1. 60 Figure 7 is a partial horizontal section on line 7-7 ofA Figure 4.

Figures 1, 2, 3 and 6 illustratea water tube boiler stoker furnace consisting of a' front wall 1, Side walls 2 and 3, bridge wall 4, water 65 tubes 5, a drum 6, an angular baile 7, a vertical baiiie 8, a gas outlet 9, a clean' out opening 10, a grate 11, a combustion chamber 12,

a Stoker mechanism 13, a coal hopper 14, a blower or fan 15, a wind box 16 and an 70 arch 17.

There are four separate and distinct circulations of air throughout the walls, arch and the furnace, illustrated in Figures 1, 2,

3 and 6, two of which circulate under the 75 pressure of a fan or blower throughout the sidewalls, cooling the interior of the furnace or that portion of'the furnace built up of a seriesk of superimposed, broken jointed air cooled refractory blocks and the air preheatso ed in transit throughout said walls is utilized as preheated air at a part adjacent to the grate, for a more perfect combustion of the fuel. I

In the third circulation the 'air from the 85 blower is forced throughout the air cooled refractory blocks of an arch and injected into the furnace above the arch or into the throat of the furnace.

In the fourth circulation, illustrated in Figures 1, 2, 3 and 6, the air from the blower enters-the wind box, passes under the stoker grate, through an elbow provided with a regulating damper, flows upwardly through the grate and fuel bed into the combustion chainber, through the throat around the tubes, drum and baffles to the gas outlet and stack.

In the first circulation throughout wall 3, illustrated in Figures 1,-2, 3 and 6, the air from the blower 15 driven by the motor 19 100 and belt 18 passes through a pipe or conduit 27 into the Wind box 16, from whence it flows into the duct 22 provided with a volumetrically controllable damper 67 within the wall 3, enters the duct 23, flows horizontally at right angles to the flow of aming gasses within the combustion chamber 12, throughout the wall 3 (which is provided with horizontal bafiies 28 and 29, vertical expansion means 30, horizontal expansion means 31 and 32), thence downwardly and then laterally through interstices 33 in the brick work of the wall under the air cooled refractory blocks 24, adjacent to the grate 11, into the combustion chamber 12, as clearly shown in Figures 1, 2, 3 and 6. l

The wall 3 as well as the wall 2 isbuilt up of a series of superimposed, broken jointed air cooled refractory blocks 24, illustrated in Fi ures 2 and 6.

n the second circulation, throughout wall 2, illustrated by Figures 2, 3 and 6, the airv from the blower 15,' driven by the motor' 19 and belt 18, passes through the pipe or conduit 27, into the wind box 16, from whence it flows into the duct 34 provided with a volumetrically controllable damper 68, within the wall 2, enters the duct 35, flows in a horizontal direction throughout the wall 2, directed by the horizontal bales 36 and 37, flowing at right angles to the flow of aming gases within the combustion chamber 12, and

finally enters the combustion chamber 12 at a point adjacent to the grate 11 through the interstices 33 in the brick workconstituting part of the wall 2 and supporting the air,

cooled blocks 24.

In the thir'd circulation illustrated in Figures 1, 2, 3 and 6, the air from the blower 15 passes into the conduit or pipe 27, enters the conduit or pipe 38 flowing upwardly into the manifold 40 through the elbow 39, the Volume of air being controlled or regulated byfthe damper 54 in pipe or conduit 38.

From this manifold 40, theair under pressure of theblower 15 passes throughout the arc 17 which is made up of a series ofv unit blocks 53, each having a flue 41 therein, into another manifold 42, common to all the lues 41, from whence it passes, preheated, after cooling the arch in transit therethrough, into another manifold 44, through the flue 43.

The lpreheated air thus collected by the manifold 44 is directed into the throat 46 of the furnace by a multiplicity of iu'es, ducts or passages 45;

In the fourth circulation as illustrated by Figures 1, 2, 3 and 6, the air from the blower or fan 15 passes into the wind box 16 through the conduit or flue 27 under the grate 11, through the elbow 20, provided with a damper, valve or'equivalent 21'controlling the volume of air from the wind box 16.

The air thus forced under the grate '11 passes upwardly through the grate and fuel thereon, into the combustion chamber 12, up-

wardly through the lthroat 46, around tubes 5, and drum 6, over baille 7, downwardly around tubes 5 under bale 8, upwardly around tubes 5 and drum 6 to gas outlet 9 from whence it goes to the stack.

. Figures 4, 5 and 7 illustrate modified circulations of air as applied to a water tube boiler stoker furnace, one circulation passing throughout one side wall to the inlet side of the blower, one circulation passing throughout the other side wall to the inlet side of the blower, the third passing from the blower throughout the arch into the throat of the furnace while the first and second circulations pass through the-blower and throughout the furnace as hereinafter more fully described. The greater part of the air the blower sucks in, preheated in transit throughout each side wall is forced under the grate into the combustion chamber throughout the furnace, while the lesser part is forced throughout the arch into the throat of the furnace.

In the first circulation illustrated by Figures 4, 5, and 7, the air enters the side wall 3, composed of a. series of superimposed, broken jointed air cooled refractory blocks 24, having horizontal flue 25 and vertical flues 26 therein, through a multiplicityl of lues each provided with a damper 69 and slide 70 into the u per horizontal flue, passes downwardly in a irection opposite to the flow of flaming gases within the combustion chamber 12, into a common manifold 57, from whence the air preheated in transit throughout the wall 3 enters the inlet side of the blower 15 being directed by the conduits 58, 59 and 60, elbowsl 61, 62 and 63 and T 65, the greater part of the air from the wall 3 thus preheated being forced through the duct 27 into the wind box umetrically regulatable damper 21, under the grate 11, upwardy into thel combustion chamber 12, through the throat 46, upwardly around the tubes 5 and drum 6, over baffle 7, downwardly around tubes 6 under baffle 8, upwardly around tubes 5 and drum 6 through the gas outlet 9, to the stack.

In the second circulation illustrated in Fi ures 4, 5 and 7the air enters the side wa 2, of similar construction as hereinbefore de- 16, through the elbow 20, provided with a vols into the'wind box 16 throu h the conduit or 'i flue 27 under the grate 11, t ough thev elbow 20, provided with a volumetrically regulatable damper 21, passes upwardly into the combustion chamber 12, through thel throat 46 around the tubes 5 and drum 6, over bales 7, downwardly around tubes 5, under baiile 8, upwardly around tubes 5 and drum 6, through the gas inlet 9 to the stack.

In the third circulation a portion of the air from the blower 15, which is sucked in and throughout the walls 2 and 3 is forced upwardly in the conduit 38, having a volumetrically controllable damper 54, through elbow 39, into manifold 40, throughout the arch 17, composed of a series of unit air cooled refractory blocks each having a iiue 41 therein, to a manifold 42, which like manifold 40 is common to all the flues 41, from whence the air preheated in transit is directed to manifold 44 through the duct 43, from whence the air is directed into the throat 46 of the furnace through a multiplicity of ducts, flues or let 9 to the stack.

In Figures 1, 2, 3,14, 5, 6 and 7 the preheated air from the walls is utilized for a more complete combustion of the products of combustion in the combustion chamber and the preheated air for the arch is utilized in the throat of the furnace above the combustion chamber.

Having thus described and illustrated the preferred embodiment of our-invention we do not desire to limitourselves to the exact subject matter pertaining to the specific circulations and combinations thereof disclosed herein, as modifications may be made Without departing from the spirit of the invention or the scope of the claims.

We claim 1. A furnace construction comprising, in combination, channelled refractory walls and a channelled refractory roof forming a comf bustion chamber, means for admittingfuel to,

l no

Athe chamber, an oiftake therefrom, a forced draft creating means, air inlet means and outlet means for the channel system of said roof, separate air inlet and outlet means for said wall channels, direct air delivery means from said drafter to said chamber, and means connecting said roof'and wallchannel systems with said drafter forming indirect air delivery means whereby air from the inlets is forced through said systems, for preheating it and cooling .the refractories,'and by way of said outlets to the chamber.

combination, .channeled refractory walls and roof, separate air inlet and outlet means for said wall channels, direct air delivery means from said drafter to said chamber, and means connecting said roof andl wall channel systems with said drafter forming indirect air delivery means whereby air from the inlets is forced through said systems, for preheating it and cooling the refractories, and by way of said outlets to the chamber, together with independent air control valves for the direct delivery means and the channel systems.

3. A furnace construction comprising, in combination, channelled refractory Walls and a channelled refractory roof forming a combustion chamber, means for admitting fuel to the chamber, an oiftake therefrom, a forced draft creating means, air inlet means and outlet means for the channel system of said roof, separate air inlet and outlet means for said wall channels, direct air delivery means from said drafter to said chamber, and means conn ecting said roof and wall channel systems with said drafter forming indirect air delivery means whereby air from the inlets is forced through said systems, for preheating it and cooling the refractories, and by way of `said outlets to the chamber, together with independent air control valves for the direct delivery means' and for each of the channel systems.

4. A furnace construction comprising, in combination, channelled refractory walls and a channelled refractory roof forming a combustion chamber, means for admitting fuel to the chamber, an oftake therefrom, a forced draft creating means, air inlet means and outlet means for the channel system of said roof, separate air inlet and outlet means for said wall channels, direct air delivery means from said drafter to said chamber, and means connecting said roofand wall channel systems with said drafter forming indirect air delivery means whereby air from the inlets is forced through said systems, for preheating it and Acooling the refractories, and by way of said outlets to the chamber, the air from said roof system being delivered adjacent the oil"- take, and the other air being delivered adjacent the center of combustion.

Signed at Long Island City,in the county of Queens and State of New York, this 12th day of November, A. D. 1925.

FRANK H. WAITE. GEORGE W. DAVEY.

a channelled refractory roof forming a com bustion chamber, means for admitting fuel to the chamber, an oiftake therefrom, a forced draft creating means, air inlet means and outlet means for the channel system of said

Images