US1616675A - Furnace apparatus - Google Patents

Description

Elana Patented Feb. 8, 1927.

UNITED STATES 1,616,675 PATENT OFFICE.

JOHN E. BELL, OF BROOKLYN, NEW YORK, ASSIGNOR TO COMBUSTION ENGINEERING CORPORATION, A CORPORATION OF NEW YORK.

FURNACE APPARATUS.

Application filed September This invention relates to furnace apparatus and it is especially useful in connection with stationary boilers burning pulverized fuel.

5 One of the primary objects of my invention is to provide an improved arrangement of cooling screen for preventing the formation of slag, which is simple and efiective in construction, the parts of which are easily l installed and readily accessible, and in which provision is made for contraction and expansion.

The foregoing, together with such other objects as may hereinafter appear or are in 1 cident to my invention, I obtain by means of a construction which I have illustrated in preferred form in the accompanying drawing, wherein:

Fig. 1 is a section through a boiler and furnace embodying my improvements; and Fig. 2 is a section taken on the line 2-2 of Fi 1.

l n the drawing I have shown my improvements in connection with a boiler of substantially the horizontal type, as the invention is particularly useful in combination therewith. This boiler comprises one Or more drums 7 the downcomer header or headers 8; the upcomer header or headers 9; and the connecting bank of tubes 1% such tubes being suitably bafiled one be e, however, 10 IlSIIlg from the bridge wall 20.

The tubes 10 extend over the outlet 11 of the combustion chamber A, such outlet being located in the upper part thereof and the combustion chamber bein of such size that combustion is completed t ierein.

The pulverized fuel is admitted by one or more burners B which may be of any prefer red construction and are located in the top wall 12 of the combustion chamber in a position to discharge the coal vertically downward, adjacent the front wall 13. The fuel and flame stream takes a U-shaped course through the combustion chamber under the influence of the draft creating means, the bend in the stream being substantially above the lgottom 14 of the combustion chamber.

front 1111.13.

5 In the bottom of the combustionchamber I out ten per cent of the air needed for combustion is supplied through the burner 16, 1922. Serial No. 538,565.

provide a water screen C composed of oppositely inclined sets of tubes 16 and 17 which are connected into the header 18 at their forward ends, such header being preferably suitably anchored. The tubes 17 are connected into the header 19 at the rear of the bridge wall 20, and the tubes 16 are similarly connected to the header 21. A plurality of pipes 22 connect the header 21 with the downcomer header 8. These pipes 22 are preferably arranged in two groups of three each at the ends of the header 21, althou h the number thereof ma be varied as t e demands of the particular installation require. The pipes 22 are anchored in the floor 23 and the portions thereabove are bent so as to take care of expansion and contraction. The pipes 16 and 17 expand from the front to the rear.

In operation the screen C absorbs radiant heat from the deposit collecting on the floor 14 so as to maintain the temperature of such deposit below the fusion or slagging point, the deposit remaining in the form of a fine ash which is readily removable.

In order to protect the bridge wall 20 from erosion, I provide a screen D composed of a plurality of pipes 24, such pipes having their lower ends connected into the header 19, the main portion of the tubes lyin within the combustion chamber and exten ing substantially vertically upward along the bridge walli20. The upper ends of the tubes24 extend rearwardly through the brid e wall and are connected into a header 25, w ichtin turn is connected with one or more of the lowermost tubes'lO' of the boiler, the rear of such tubes being downwardly bent, as indicated, for this purpose. The header 25 is anchored, as indicated at 26. Expansion and contraction of the tubes 24 between the headers 19 and 25 is taken care of by virtue of the bends in such pipes.

The screen D o erates to cool the deposit collecting on the ridge wall 20 below the slag forming temperature. This deposit builds out in the form of whiskers or hairlike horns, formed by particles building out in a direction against the flow of the fuel and flame stream, the deposit breaking olf of its own weight.

The space between the tubes 24 is such as to erinit this deposit to fall to the bottom of the combustion chamber. If the deposit on the rear wall were permitted to slag I10 it would, in running down, wash away the bridge wall.

The arrangement and connection for tne screens is simple and efiective, the various parts are easy to install and are readily accessible from the exterior of the combustion chamber.

Other advantages will occur to those skilled in the art.

What I claim is:

1. In a pulverized fuel burning furnace, the combination of a boiler having tubes; a combustion chamber; a cooling screen in the bottom of the chamber marginally of the zone of combustion includin two sets of tubes, a header with which bot sets are connected at one end, and header for each set at the other end; connected to one of said last mentione eaders at one end and anchored at the other end; means connecting said pipes with the downcomer header of the boiler; a second cooling screen marginally of the combustion zone composed of tubes connected with the other of said headers at one end; and a header with which the tubes of the second cooling screen are connected at the other end; said last header being connected with a tube of the boiler.

2.111 a pulverized fuel burning furnace, the combination of a boiler having tubes; a combustion chamber; a cooling screen in the bottom of the chamber marginally of the zone of combustion including two sets of tubes, a header with which both sets are connected at one end, at the other end; pi es connected to one of said last mentioned headers at one end and anchored at the other end; means connecting said pipes with the downcomer header of the boiler; a second cooling screen marginally of the combustion zone composed of tubes connected with the other of said eaders at one end; and a header with whic the tubes of the second cooling screen are connected at the other end; said last header be ing connected with a tube of the boiler and being anchored; and the header common to both of said sets of tubes of the first screen. being anchored.

3. In combination, a combustion chamber for burning fuel in $11 nsion having an outlet in its u per part or the products of combustion, a oiler over said outlet, a cooling stream above the floor of the chamber and mar 'nal of the zone of combustion and comp of tubes spaced apart to permit refuse-particles to pass freely therebetween to the said floor, said screen tubes being arranged in two rows in substantially V-form, a header at the apex of the V common to both rows, a header for each row into which the opposite ends of the tubes of the respective row are connected, said headers bein exterior of the chamber, a downcomer lea ing from the boiler to the lower of said last the boiler, and means and header for each set two headers, a second substantially upright screen within the chamber marginal o the zone of combustion and composed of a row of tubes, the lower ends of which are connected with the upper of said last two headers, a header exterior of the chamber with which the upper ends of said tubes of the upright screen are connected, means connecting said last header into the circulation of for introducing the fuel to be burned in suspension.

4. In combination, a combustion chamber for burning fuel in suspension having an outlet in its u per part for the products of combustion, a oiler over said outlet, a cooling screen above the floor of the chamber and mar 'nal of the zone of combustion and compose of tubes spaced apart to permit refuse particles to pass freely therebetween to the said floor, said screen tubes being arranged in two rows in substantially V form, an anchored header at the apex o the V common to both rows, a header for each row into which the opposite ends of the respective row are connected, said headers being exterior of the chamber, a downcomer leading from the boiler to the lower of said last two headers, means for anchoring said downcomer, a second substantially upright screen within the chamber marginal of the zone of combustion andcomposed of a-row of tubes, the lower ends of which are connected with the upper of said last two headers, an anchored header exterior of the chamber with which the upper ends of said tubes of the upright screen are connected, means connecting said last header into the circulation of the boiler and means for introducing the fuel to be burned in sus ension.

5. In combination, a com ustion chamber for burning fuel in sus nsion having an outlet in its u per part or the products of combustion, a oiler over said outlet, a cooling screen above the floor of the chamber and mar inal of the zone of combustion and compose of tubes spaced apart to permit refuse particles-to pass freely therebetween to the said floor, said screen tubes bein arranged in two rows in substantially V cm an anchored header at the apex of the \i common to both rows, a header for each row into which the opposite ends of the respective row are connected, said headers being exterior of the chamber, a downcomer leading from the boiler to the lower of said last two headers, a second substantially upright screen within the chamber marginal of the zone of combustion and composed of a row of tubes, nected with the, u per of said last two headers, an anchore header exterior of the chamber with which the upper ends of said tubes of the upright screen are connected. means connecting said last header into the circulation of the boiler, and means for inthe lower ends of which are con-J troducing the fuel to be burned in suspension.

6. In a pulverized fuel burning furnace, the combination of a boiler having tubes; a combustion chamber; a cooling screen in the bottom of the chamber marginal of the zone of combustion composed of a row of tubes, a. header into which one end, of the tubes of the screen are connected, means'for anchorinfi said header, a header into which the ot er end of the tubes of the screen are connected, a second substantially upright screen within the chamber marginal of the zone of combustion and com sed of a row of tubes, the lower ends of w ic are connected with said last header, an anchored header exterior of the chamber with which the upper ends of said tubes of the upright screen are connected, means connecting said last header into the circulation of the boiler and means for introducing fuel to be burned in suspen- 51011.

In testimony whereof, I have hereunto signed my name.

J OHN E. BELL.

troducing the fuel to be burned in suspen sion.

6. In a pulverized fuel burning furnace, the combination of a boiler having tubes; at

b combustion chamber; a cooling screen in the bottom of the chamber marginal of the zone of combustion composed of a row of tubes, a. header into which one end of the tubes of the screen are connected, means for anchormg said header, a header into which the ot er end of the tubes of the screen are connected, a second substantially upright screen within the chamber marginal of the zone of JOHN E. BELL.

CERTIFICATE OF CORRECTION.

Patent No. l, 616, 675,

granted February 8, 1927.

to JOHN E. BELL.

It is hereby certified that error appears in the above mentioned patent requiring correction as follows:

"and" claims 1 and 2 respectively, for the word printed specification of the Page 2, lines 17 and 35, read "a", and line 54, claim 3,

for the word "stream" read "screen"; and that the said Letters Patent should be read with these corrections therein that t the case in the Patent Office.

he same may conform to the record of Signed and sealed this 1st day of March, A. D. 1-927.

Seal.

M. J. Moore, Acting-Commissioner of Patents.

CERTIFICATE or connection.

Patent No. 1,616,675, granted February 8, 1927.

10 JOHN 1:. am.

It is hereby certified that error appears in the printed specification of the lbove mentioned patent requiring correction as follows: Page 2. lines [7 and 35, claims 1 and 2 respectively, for the word "and" read "a", and line 54, clalm 3, for the word "stream" read "screen"; and that the aaidLettera Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 1st day of March, A. .D. 192?.

M. J. Moore, Seal. ActinpGonmiaaiooer of Palm.

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