US1739907A - Furnace - Google Patents

Description

Dec. 17, 1929. G. A. KoHou'r 1,739,907

rumuncs I Filed Aug. 22. 1925 5 Sheets-Sheet 1 @www Dec. 17, 1929. s. A. Kol-lou'r 1,739,907

FURNACE med Aug. 22, 1925 5 sheets-sheet 2 FURNACE y Filed Aug. 22, 1925 5 Sheets-Sheet 3 y @MHz/72554 Dec. 17, 1929; e. A. KoHou'r FURNAQE Filed Aug. 22, 1925 5 Sheets-Sheet 4 Dec. 17, 1929. G. A. KoHouT FURNACE Filed Aug. 22. 1925 5 Sheets-Sheet 5 Patented Dec, 17, 1929 GEORGE A. KOHOUT, OF CHICAGO, ILLINOIS i FURNACE Application inea August 22, 1525,. Serial No. 51,835.

My invention relates to furnaces and more particularly t-o a furnace provided with a hopper from which a stoker is adapted to convey fuel through theV combustion chamber.

It is a purpose of my invention to provide a furnace that is providedwith an internal hopper and a combustion chamber and which is provided with means for conveying fuel from the hopper to the combustion chamber under a wall that divides the furnace into the hopper and a combustion chamber.

In my application, Serial No. 37,136, filed June l5, 1925, I set forth a furnace having` these above set forthk general characteristics.

- My present invention is an improvement upon a furnace such as above set forth in that I provide additional means for baffling or directing the flow of a certain portion of the gases in such a manner as to lead to more thorough and complete combustion. e

I will describe various forms which my invention may take by referring to the accompanying drawings in which- Fig. l is a longitudinal sectional view of a portion of a furnace and the adjoining portions of a boiler embodying my invention;

Fig. 2 is a similar kind of view of a fire boX boiler embodying a modified form of my invention;

Fig. 3 is a similar view of a return tubular boiler showing my improved invention;

Fig. 4 is a similar view of a return tubular boiler showing a modified form of my invention;

Fig. 5 is a fragmentary sectional view on line 5-5 of Fig, 4;

6 is a view similar to Fig.-2 of a modified form of my invention; and

Fig. 7 is a fragmentary section on line 7 of Fig. 6.

Referring more particularly to Fig. l, I show a furnace having a front wall 20, a boiler 2l, a bridge wall 22 and an ash pit 23. The boiler has a crown sheet 24 which completes the fire box. vA 'stoking door 25 is provided through which fuel may be inserted into the furnace, the boiler having the usual side walls of which one is indicated at 26. Mounted within said furnace is the Stoker grate 27, the form shown being sub-A stantially that of my Patent` No. 1,355,095, in which the individual members or grate bars are, operated to advance the fuel from the upper to the lower end thereof. At the lower or discharge end; of the stoker 27 is provided an` ash dumping section 28 and a fuel retaining member 29jwhich are operated byfmeans of the operating bar 30 provided Y with a handle 31,.the Stoker being operated by means of the handle 32 Which is connected with the stoker grate 27 by means of the bar or link 33.

My improved furnace of the type set, forth in my said copending application contemplates the use of an arch or baffle wall 34 which is mounted in close proximity to the front wall 20. In the operation ofthe furnace, the fuel is introduced through the door 25 and the space between thel arch or baffle wall 34 and the front wall 20forms a hopper where the fuel collects to b e later propelled Vforwardly and downwardlyv underthe arch along the grate into the combustion chamber where it is consumed. There is thus provided a hopper within the furnace itself. The coal which lies within the hopper portion is slowly coked and certain products of distillation are given off which pass either upwardly through the duct 35 provided in the arch 34 or downwardly through the body of the fuel into the combustion ,chamber above the grate. Below l the firing door 25 anV opening in the front wall, which is partially closed by loosely laid brick is shown for instance aty 36, so that fresh air may pass inwardly through the coal in the hopper, some of which may thereupon travel upwardly, and some of which may travel downwardly as the case may bedepending upon the condition of the fire and the thickness of the fuel. i

My improvement in connection with a furnace ofthe character thus far'described consists Yin the provision of an additional arch or baffle wall 37 which extends preferably from one side wall to the other backwardly of the main arch 34; thus to conduct the products of 4distillation which pass through the duct 35 downwardly into the heated zone' above the fuel;,thus to prevent these products of distillation from passing outwardly without being thoroughly combusted.

My invention also contemplates a novel structure for the arch 341-, in that I provide a hollow cast iron girder 8S which is mounted within the side walls of the furnace, which girder has projections or iianges 39 and a flat top 40 so that suitable masonry work of fire resisting characteristics may be mounted in place thereon and suitablyheld in-its al.- lotted position. I preferably use tile, such as the tile 4l, which may be supported from the flanges 89 and then built up the remaining parts of the arch with the brick 42. YIn this way I secure a substantial and satisfactory structure for the arch whichhas a long life.

In order to keep the girder 88 at a low enough temperature so as to insure long life,` I provide means for circulating cooling air through the interior thereof and to this end I provide a pipe L3 which extends from the ash pit upwardly into the interior of the girder .and then provide a second pipe e3 which leads outwardly from the interior of the girder at some point higher than the point at which the pipe 43 is and the free exterior of this pipe 4:3 discharges the heated air from the interior of the girder preferably into the ZoneV above the fuel hopper. This air assists in the process of combustion. y

It will thus be seen I have provided an improved form of furnace construction having an interior hopper in whch the productsof combustion are conducted through the furnace in such a manner as to insure complete combustion, and it will also be apparent that I have provided an arch structure which is very substantial and capable of long life under the exacting conditions required of .hes of this nature.

In Fir' I show a boiler practically of the same ty f as the one shown in Fig. l with the exception that I have, to some extent, modi- 'lied the construction and arrangement of the o arches. Inrthis particular illustration,

sonry but is supported by two tubes 45 which are mounted in the side walls 0f the furnace and through which av cooling liquid passes. The arch 44, however, does not extend entirely to the crownl sheet o f the boiler, but is built upwardly a sufficient distance sov as to 'l' Y Athrough which t of dis i may pass from the front of this arch to the rear thereof to be there deflected downwardly by the second arch 47 which is likewise supported by a water carrying pipe 48 suitably mounted within the furnace structure and connected with a source of circulating water supply;

In Fig. 3 I show a boiler of the return tubular ,type having the same internal hopper construction and provided again with two arches, the arch 87 being simi u 4to the arch the forward arch -l-lis made entirely of ma- 37 of Fig. l and extending entirely across the furnace, being built arch fashion, as is indicated by the arched portion at e9. The forward arch 50 occupies approximately the saine space in the furnace that is. occupied by the arch 4.4 of Fig. 2, but the arch instead of boing supported by pipes, is built in arch fashion, the arched portion being indicated at 5l and a suitable opening e6 being left above the top of the arch to permit the flow of the products of distillation therethrough. It will be noted that the forward walls of all of the forward arches are inclined backwardly instead lof being vertical, thus to facilitate the downward passage of the fuel in the hopper.

In Fig. l- I show a boiler similar to the one shown in Fig. 3 but I arrange a sort of grid iron structure consisting of a plurality of pipes 52, as more clearly apparent from Figs. t and 5, which pipes at the opposite extremities connect with'suitable water legsA 53 and 54, which water legs are joined to and connect with the interior of the boiler 21 by pipes 55 and 56 respectively. lThese pipes are connecte-d to the boiler at different levels so as to provide a continuous circulation of cooling water therethrough, thus to prevent overheating of these pipes or tubes. This composite grid iron structure forms the front baille wall 57 the space between the pipes being sufficiently similar so that the fuel within the hopp-er does not fall through these interstices. Baclrwardly of this wall or arch 57, I provide a second arch 37 similar in form to the arch shown in Fig. 3.

In Figs. 6 and 7, I show a further modified form of arch structure, this being illustrated in connection with a fire box boiler such as shown in Figs.' l and 2. In this particular instance the boiler 21 has the downwardly extending side water legs 58 and 59. Between these two I connect two baffle walls, preferably the baffle walls 60 and 61, the baflle wall 60 extending entirely across the boiler from the water leg 58 to the water leg 59 and the same is true of the arch 61. In this way a complete metallic structure is provided. Upwardly of the baffle wall 6() there is the opening 52 to permit passage therethrough of the products of distillation, the two baffle walls being connected with the water supply of the interior of the boiler are thus kept in the same relatively cool condition that the remaining parts of the boiler are kept, thus to prevent deterioration due to the combustion of the fuel. i

In the operation ofthe device, the furnace is suitably provided with fuel and the hopper substantially filled, then as the combustion continues, the grate bars are actuated by means of the handle 32 to advance the fuel, which has already been coked or partially cohed, into the zone of high heat. After 'the fuel has been completely consumed except expected to throw the fuel over the entireI length of such a long grate. In this manner,

larger units may be operated because of thisv human element and one unit of double capacity may take the place of the two units heretofore used with the consequent increase in efficiency. From what has been thus described, my invention will be clear to those skilled in the art.

That I claim as my invention and desire to secure by United States Letters Patent is:

l. In a furnace7 a front wall7 an arch spaced from said front wall to provide a hopper therebetween, a Stoker having a portion eX- tending forwardly beneath said arch to form the bottom of said hopper, said archV having a duct therein leading from the hopper into the space rearwardly of said arch, means for conducting cooling gas into the interior of said arch and means for conducting gas from the interior of said arch into said hopper.

2. In a furnace, a front wall, an arch spaced from said front wall to provide a hopper therebetween, a stoker having a portion eX- tending forwardly beneath said arch to form the bottom of said hopper, said arch having a duct therein leading from the hopper into the space rearwardly of said arch, means for conducting cooling gas into the interior of said arch and means for conducting gas from the interior of said arch into said hopper, and a second arch rearwardly of said first named arch for conducting gas from said duct in a downward path.

3. In a furnace, a front wall, an arch spaced from said wall to form a hopper therebetween, f

a. grate having a portion extending forwardly for conducting air through the fuel bed into the hopper above the fuel bed to mix the same with the gas in the hopper prior to its passage into the combustion chamber.

5.V In a furnace having a frontlwall and a fuel feed inlet in said front wall, a Stoker grate extending rearwardly from said front wall to provide a support for the fuel in said furnace, means comprising a transverse arch adjacent said front wall forming with said front wall a coking chamber between the fuel inlet and the burning fuel on said grate, said arch having ducts leading 4from the upper portion of said colring chamber tothe rear side of said arch and a second arch rearwardly of said first named arch for directing the gases from said coking chamber downwardly over the fuel bed on said grate.

In witness whereof, Ihereunto subscribe my name this 8th day of August, A. D. 1925.

GEORGE A. KOHOUT.

of said arch to form the bottom of said'hopp per, means for conducting gas from the upper portion of said hopper into the space rearwardly of said arch, a second arch rearwardly of said first aforesaid arch for directing the gas from said hopper downwardly between said arches, and means for conducting a cooling gas from outside said furnace through said first named arch and into said hopper.

4. In a furnace, a front wall, an arch spaced from said wall and extending downwardlyto the no-rmal level of the fuel bed to form a hopper between said front wall and said arch, a fuel support formin a bottom for said hopper, means adjacent t e top of said arch for conducting gas arising from the fuel in said

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