US1795357A - Furnace construction - Google Patents

Description

March 10, 1931. ALLEN 1,795,357

FURNACE CONSTRUCTION Filed May 26, 1927 I 3 Sheets-Sheet 1 j INVENTOR FM 6 M ATTORNEYS March 10, 1931 I REALLEN 1,795,357

FURNACE CONSTRUCT I ON Filed May 26, 1927 3 SheetsSheet 2 INVENTOR Fzy - AiTORNEYS March 10, 1931. B, ALLEN 1 ,795 ,3 57- FURNACE CONSTRUCTION Filed May 26, 192? 5 Sheets-Sheet 3 V g IN/ViNTOR ATTO R N EYS Patented Mar. 10, 1931 UNITED .STATES PATENT. OFFICE FRANK B. ALLEN, OF LOWER MARION TOWN SHIP. MONTGOMERY COUNTY, PENNSYL- VANIA, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE ALLEN-SHERMAN-HOFF COMPANY, OF PHILADELPHIA, I PENNSYLVANIA, A CORPORATION OF PENNSYL- VANIA.

FURNACE CONSTRUCTION Application filed May 26, 1927. Serial No. 194,384.

This invention relates to apparatus for handling hot solid materials such as ashes and the like produced upon the combustion of fuel in furnaces.

Heretofore, ashes and other like products, formed upon combustion of fuel in furnaces such as are used in boilers, have been received in ash hoppers or receptacles and discharged therefrom in various ways, the ashes and the walls of the compartments in which they are received being cooled as by being sprayed with water. The ashes contain considerable qualities of heat and in general this has been lost or merely dissipated, not only doing no useful work, but frequently doing considerable damage, particularly to the walls of the receptacle.

By the application of my invention, it is possible to protect the walls of containers from the excessive temperatures to which former types of Walls were subjected by heat from the hot solid material and at the same time to absorb the heat radiated by said material so that this heat may be used to perform useful functions.

The invention will be better understood from the description of two practical embodiments thereof illustrated in the accompanying drawings, in which Fig. 1 is a transverse section of a boiler furnace bottom embodying my invention taken along the line II of Figure 2;

Fig. 2 is a view, partly in longitudinal section, on the line H H of Fig. 1 and partly in elevation; and

Fig. 3 is a transverse section of a modified form of furnace bottom.

In Figs. 1 and 2 the furnace wall is indicated at 1, and the furnace bottom is enclosed by two downwardly converging side walls and vertical ends. One of these walls is of refractory material, indicated at 2, supported upon a metallic frame work 3, there being upwardly extending passages 4 interposed between the refractory material and the metal, through which passages air may be- This air caused to flow to cool the walls. may be caused to move through these passages in any desired manner but is illustrated as being drawn through the same by a vent 5 extending upwardly within the furnace wall. The other wall of the furnace bottom is in the form of a water wall comprising a continuo ns series of inner plates 6 carried upon a series of upwardly extending pipes 7 extending from a header 8 to a second or upper header 9, the p pes being disposed closely together and in mtimate contact with the plates 6 so thatheat reaching these plates is readily transmitted to the pipes and so to the water within the same.

The ends of the bottom are composed of plates 1Q similar to plates 6 above described and carried upon pipes 11 extending upwardly from headers 12.

As shown, the first mentioned wall extends to a considerable distance below the lower edges of the water walls, and walls 13 and 14, composed of metallic frame work and refractory lining, extend upwards from the level of the lower end of the first mentioned wall to the bottom of the water walls.

lhe walls 13 and 14, together with the firstnn-wntnmed walls from an ash receiving hopper wh ch is relatively long and narrow and wlnch 1S overhung by a bend 15 in the side water wall. The bottom of this hopper is divided by crickets 16 into a plurality of discharge openmgs, each of which is provided with a closure or door 17. The doors may be operated by handles 18 and pinions 19 engaging rack-teeth on the doors to control the discharge of ashes from the hoppers.

Below each pair of discharge openings are downwardly converging feed plates 20 upon which the ashes are discharged upon the openmg of the doors and down which they are conveyeidbylwater fiozln nozzles 21 to a central or s uice iopper 1.2 iavin a rating or 1'' 23 n the bottomthereof: below which is sluiceway 24 along which the ashes are conveyed by a stream of water from nozzles, such as 25, to a point of disposal. Access doors are provided 1n the sides of the sluice hopper so that large SOllCl pieces of material may be remgyeld from the grid or broken thereon.

sles are received into the ho) er below the bend 15 of the water wall arid the heat radiated from the ashes is absorbed by the water walland caused to perform useful work in heating the water therein, which may be the feed-water for the boiler, or the like. The heat which reaches the refractory lining 2 of the long inclined wall is reflected therefrom and also reaches the plates 6 and 10 of water walls, and is absorbed by the water. This absorption of the heat reaching the plates 6 and 10 and the refractory lining 2 keeps these sufficiently cool that they will not deteriorate rapidly, at the same time utilizing the heat for useful work.

It is apparent that the ash receiving hopper is defined by the lower portion of the inclined wall 2, together with the vertically disposed wall 13, and the side walls. This hopper is partially covered by the overhung portion 15 of the furnace bottom which is defined by the inclined wall 6 together with the upper portion of the wall 2 and the side walls.

In the modification shown in Fig. 3, two opposed water walls, composed of plates 30 and 31, and tubes 32 and 33, are used instead of using a wall with refractory lining as shown in the first modification. Ihe ashes are received below the bends 34 and 35 of these water walls in hoppers formed by vertical walls 36 and 37, each consisting of a metal frame work of refractory lining, and a central cricket 38.- The hoppers terminate at their bottoms in discharge openings closed by doors 39 and 40, through which openings the ashes may be discharged upon feed plates 41, down which they may be conveyed by streams of water from jets 42 to a central or sluice hopper 43. The bottom of this hopper is provided with a grid 44 above a sluice 45, by means of which sluice the ashes are conveyed to a point of disposal. Doors 46 are provided in the walls of the compartment formed to enclose the feed plates and sluice hopper to provideeccess to the grids and permit large solid pieces of material to be removed therefrom or broken thereon.

In this modification the heat radiated from the ashes is, of course, absorbed by the bends 34 and 35 of the water walls and in a manner similar to that described in connection with the first modification, these walls are kept sufficiently cool to prevent rapid deterioration while the heat absorbed is used for some useful purpose.

While I have described the illustrated embodiments of my invention in some particularity, these embodiments are shown by way of illustration only and not by way of limitation, and I do not, therefore, limit myself to the precise details shown and described but claim as my invention all modifications thereof coming within the scope of the appended claims.

Claims:

1. Inafurnace, a hopper having a discharge opening, a closure therefor, a furnace bottom, a side wall of the hopper being inclined to the horizontal at an angle greater than the angle of repose of combustion residues and extending upwardly to form a wall of the furnace bottom,'the opposed wall of the furnace bottom being inclined downwardly toward the first mentioned wall and overhanging the hopper.

2. In a furnace, a hopper having a dis charge opening, a closure therefor, a furnace bottom, a side wall of the hopper being inclined to the horizontal at an angle greater than the angle of repose of combustion residues and extending upwardly to form a wall of the furnace bottom, the opposed wall of the furnace bottom being inclined downwardly toward the first mentioned wall and bulging inwardly at its base over the hopper.

3. In a furnace, a hopper having a discharge opening, a closure therefor, a furnace bottom,aside wall of the hopper being formed of refractory material provided with pas sages therein adapted to receive cooling fluid and inclined tov the horizontal at an angle greater than the angle of repose of combustion residues and extending upwardly to form a wall of the furnace bottom, the opposed wall of the furnace bottom being inclined downwardly toward the first mentioned wall and overhanging the hopper and provided with passages therein adapted to receive cooling fluid.

4. In a furnace, a hopper'having a discharge opening, a closure therefor, a furnace bottom, a side wall of the hopper being formed of refractory material and inclined to the horizontal at an angle greater than the angle of repose of combustion residues and extending upwardly to form a wall of the furnace bottom, the opposed wall of the furnace bottom being inclined downwardly toward the first mentioned wall and bulging inwardly at its base over the hopper and provided with passages therein adapted to receive fluid to be heated.

In testimony whereof I hereunto afiix my signature this 25th day of May, 1927.

FRANK B. ALLEN.

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