US1802138A - Furnace wall - Google Patents

Description

D. CSANDY FURNACE WALL Filed Jan. 28. 1927 April 21, 1931.

INVENTOR v BY Mfw ATroRNEYS e Patented Apr. 21, 1231 UNED STTES raam DEJOE CSAN'DY, OF BROOKLYN, NEW YORK, ASSIGNOR T0 INTERNATIONAL COMBUSTION ENGIN CORPGRATION, OF NEW YORK, N. Y., A. CORPORATION 0F DELAWARE FUBNACE WALL Application filed January 28, 1927. Serial No. 164,193.

rlhis invention relates to furnaces, and more particularly to the wall construction of a furnace in which pulverized fuel is burned under stationary boilers.

One of the principal objects of the invention is the provision in the furnace of an' improved wall, the construction of which per- 'mits combustion air to bc delivered into the combustion chamber in such manner that the refractories are protected against theiscorl ing action of the flames.

eficiencylwith which the wall is protectedl from radiant heat.

A still further object of the invention is 1 vthe provision of a front wall, wherein sheet metal partitions or plates are employed for dividing the wall into a number of horizontal compartments, the compartments being in damper controlled communication with a source of air supply, whereby greater or less uantities of combustion air may be delivered at different elevations into the combustion chamber. y

Other objects of the invention will appear hereinafter.

The invention consists substantially in the construction, combination, location and relative arrangement of parts, all as will be more fully hereinafter set forth, as shown in the accompanying drawings, and finally pointed out in the appended claims.

In the accompanying drawings- Fig. 1 is a sectional plan view of a portion of the furnace taken on the line 1-1 of Fig. 2, and

Fig. 2 is a section of the furnace taken on the line 2--2 of Fig. 1.

Referring more particularly to these drawings, the reference numeral 10 designates the combustion chamber of the furnace, the center line of which is indicated by the line 11. This chamber 10 is'covered at its top by the arch 12, through a suitable opening in' whic the fuel is admitted in a downward direction to a battery of burners 13, the center line of which is indicated ,by the line 14. About twenty to thirty percentof the air for combustion is admitted directly with the fuel and through the burners, the remainder of this air being supplied into the combustion chamber at successive elevations in the manner to be hereinafter described.

The side Walls 15 of the furnace may be composed `of suitable refractory material, and may be covered, on their inner surfaces, by a .water Wall of tubes 16 suitably connected into the circulation of the boiler. The front wall of the boiler comprises an outer section 17 and an inner section 18 composed of re fractory, brick. In this instance, the inner section is longitudinally curved. These front wall sections 17 and 18 are spaced apart to form a hollow wall, for the purpose of permitting the passage therethrough of combustion air, preferably from opposite sides of the furnace, the chamber between these wall sections being in direct communication with the atmosphere or other source of air supply. The air, in its passage through this chamber, becomes heated, thereby insuring greater eiliciency of combustion at t-he same time that it operates to cool the wall, thus extending the life of the refractory material. rI he exterior surfaces of both the side walls 15 and the front wall section 17 are covered With metallic sheathing 19 and 20, respectively.

Extending vertically at the front of the side walls 15, and serving to reinforce the forward edges thereof, are the channel members 20 supported from the buck stays 21. Interconnecting the forward walls of these channel members20', and the side edges of the front wall section 17, are the sheet metal panels 22, the forwardv vertical edges of these panels 22 being reinforced and secured in upper header `24; being suitably strap-suspended below the arch 12, as indicated at 12a. As most clearly appears in Fig. 1,- the brick of the section 18 is provided, on its inner surface, with a plurality of uniformly spaced vertically extending grooves 2? in each of which is seated a vertically extending water tube 28, the opposite ends of these water tubes being connected into the upper and lower headers 24 and 25. Still further, it willfbe seen that each of the tubes 28 are provided with oppositely disposed and longitudinally extending ins 29 overlying the interior surface of the inner section 18. Bolts 30 extend through these fins 29 and the refractories of the inner section, so that the water tubes 28 constitute an eiiicient medium for supporting and maintaining the refractories in position. The tubes 28 are provided with sand joints at the points 31 and 32, thus permitting a certain freedom ofY vertical movement to take care of expansion and contraction of the inner section of the front wall.

Extending inwardly from the outer section 17 of the front wall at successive elevations thereof are a plurality of horizontally extending sheet metal partitions 33. The forward edges of these partitions are supported upon angle members 34 and the rear edges thereof terminate short of the curved inner section 18, these rear edges being longitudinally contoured to conform with the curvature of this section. It will thus be seen that the provision of these sheet metal artitions 33 serves to divide thechamber between the front and rear sections of the wall into a, plurality of horizontal compartments 35, which compartments are in communication with a source of air supply, by means of damper controlled inlets 35 in the side panels 22 (see Fig. 2) By reason of the fact that the panels 33 terminate short of the brick section,.the latter is free to expand and contract. Each of the horizontal compartments 35 are in communication with the combustion chamber 10'through the ports or openings 36 in the brick 18. It is to be noted that these ports or openings 36 are more or less tortuous to prevent radiant heat from reachin the outer section.

Iy reason of the provision of the damper controlledinlets, it is possible to so regulate the admission of air as to supply any desired amount of air into the combustion chamber at any desired elevation. Further, it will be noted that the chamber formed by the inner and outer sections 17 and 18 of the wall is restricted in its central portion, the maximum width being at the opposite ends thereof. This insuresa uniform supply of air through the various ports or inlets 36 at all times, with the result that more perfect and uniform 'combustion is had in the combustion chamber.

1. In a furnace for burning fuel in suspension, a wall construction 'including an outer section, a metallic sheathing for-the spaced finned water tubes adjacent the inner section, and means for supporting said inner section from the fins of said water tubes.

3. In a furnace, a front wall construction including an outer section, a pair of water headers supported respectively adjacent the top and bottom edges of said outer section,

a plurality of longitudinally finned tubes in-V terconnecting said water headers, an inner section of refractory material spaced inwardly from said outer section, bolts passing through the fins of said water tubes and said inner section whereby to support the latter upon said tubes, and means for introducing combustion air between said water tubes into the combustion chamber of the furnace at predetermined elevations thereof.

4. In a furnace, a wall composed of inner and outer sections spaced apart to permit the passage therethrough of air for combustion, said inner section being formed of substantially vertically extending courses of refractory blocks, together with openings between the courses for passage of air from the space between the sections to the combustion space of the furnace and a water tube extending along the inner side of each of said courses having tins extending from the tube on each side thereof to the edges of the openings between the courses.

5. In a furnace, a wall composed of inner and outer sections spaced apart to permit the passage therethrough of air for combustion, said inner section being formed of substantially vertically extending courses of refractory blocks, together with openings be' tween the courses for passage of air from the space between the sections to the combustion space of the furnace and a water tube extending along the inner side of each of said courses having fins extending from the tube on each side thereof to the edges of the openings between the courses, said inner section being supported by said tubes.

In testimony whereof I have hereunto.

signed my name.

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