US172554A - Improvement in reverberatory furnaces - Google Patents

Description

W. cHxsHoLM. @E VERBER'AT'ORY FURNACE.

No.172,554. Patented un. z5, 1876.

N.PE1ERS` FHOTOL\THOGRAPHER. WASHINGTON. n.6.

UNITED VS'I'Atras PATENT FFICE.

WILLIAM oHIsHoLM, or CHIUAGO, ILLINOIS.

IMPROVEMENT IN REVERBERATORvI-'URNACES- Specification forming part of Letters Patent No. 172.5511, dated January 25, 1876; application filed December 2, 187:3.

To all whom lt may concern:

Be it known that I, WILLIAM CHIsHoLM, of Chicago, county of Cook, State of Illinois, have invented or discovered a new and useful Improvement in Metallurgie and Steam-Boiler Furnace 5 and I do hereby declare the following to be a full, clear, concise, and exact description thereof, reference being hadA to the accompanying drawing making a part of this specification, in which-like letters indieatin g like parts- Figure l is a side eleva-tion of my improved metallurgie and boiler furnace. Fig. 2 is a longitudinal vertical section thereof. A Fig. 3 is a transverse vertical section through the line m x, Fig. 2. Fig. 4 is a like section in the line y y, Fig. 2; and Fig. 5 is a perspective view of -one of the perforated bricks employed.

My improvement relates to an improved construction of reverberatory furnace for heating, reheating, or otherwise treating metals at high temperatures, and in connect-ion therewith of a steam-generator, for the generation of steam by the use of the otherwise waste heat and products of combustion from the furnace.

In the accompanying drawing, I have shown two fire-chambers,- A A', and two reverberatory chambers, B B. Beyond these the number may be increased at pleasure by a duplication of the devices shown. The first fire-chamber A is of the usual or any suitable construction, with underlying grate-bars a, ash-pit C, closed by doors c; also, with a bridge-wall, a2, on the other side of which is the reverberatory chamber B of any desired size or construction.

In the use for which I especially design itthat is, for heating or reheating metals preparatory to working orreworking-I prefer to make it of considerable length, and provide a num ber of doors, I), through which the charges of metal may be introduced and removed, whether in the shape of bars, slabs, plates, blooms, ingots, billets, faggots, bundles, Src. At the opposite end of the chamber B, but with an intermediate bridge-wall, b2, I make the sec-v ond lire-chamber A with, by preference, about half the capacity of the rst, more or less, and with like grate-bars al underlying ash-pit C', closed by doors, as before, and a bridge-wall, a3, between it and the next reverberatory chamber B. This has a like series of doors, D', as before described, and the heat, gases, and other product-s of combustion not consumed pass up by and along fines g It in contact With steam-generators H El, one or more, of any desired' construction, and thence to the stack h.

In order Vto facilitate and render more perfeet and complete the combustion of the fuel, particularly where soft or bituminous coal is employed, I introduce heated air at various Y points. Ihis air is driven in by any suitable blast through a trunk-pipe, p. From this a branch, d, leads to the ash-pit G, to furnish under the desired blastepressure the required amount of oxygen to the fire at that point, and another like branch, d1, furnishes a like supply to the ash-pit C. A third branch, d2, leads to a hollow air box or chamber, e, preferably made of cast-iron, and which is arranged directly or nearly over the lire-bridge a2, and in line therewith transversely across the furnace. A fourth branch, d3, leads to a like air box or chamber, e', arranged in like manner over the bridge-Wall a3. The lower side of each chamber e or e' is closed by perforated bricks, tiles, or tuyeres s, one of which is shown in enlarged view in Fig. 5. These bricks are perforated in a diagonal or inclined direction, as shown, and are so set that the holes shall discharge or supply air downward and forward in the direction of the line of draft. As they are exposed to the action of the heat passing over the bridge-wall they are raised to and kept at a high temperature, so that the air becomes heated thereby before it enters the workingchamber. rIhe capacity of the boxes or chambers e e', relatively to the aggregate area of the perforations, is such that the air will be retained or stored therein long enough to be heated, so that, after passing through the perforations, and on entering the working-chambers, it will be at or but a little below furnace-heat. The result of the admission of air at such points and under such conditions,` will be readily understood by those skilled in the art, and need not be further explained. At the second furnace, and intermediate between the bridge-walls b2 and c3, I make the cover of the furnace with an inverted bridge-wall or low arch, n, whereby the gases and other products of combustion which mayl have reached that point unconsumed will be deflected downward to or toward the second fire in the chamber A', so as still further to facilitate and insure their combustion.

In order to secure like useful results in the ue h I carry branch pipes u u', one or more, from the trunk p transversely across beneath such llue h, and make therein a slit, c, so arranged that a thin layer or stratum of air shall be projected therefrom upward and forward in the line of the draft. It will be observed that here, as also in the metallurgie furnace, the direction of the injected blasts is such as not only to increase combustion by direct action, but also such as to deflect the heat, heated gases, &c., to or toward the point, place, or object at or on which the action of the heat is desired.

The improvements herein described, so far las they are applicable to other furnaces, may be used in connection therewith, and the number of the furnaces and working-chambers, with the appliances described as belonging to each, may be increased to any desired practical extent. I thus make a continuous series of furnaces and Working-chambers in the same line of draft, and utilize the othewise waste products of combustion from the last of the series in generating steam as a motive power to drive the mill machinery.

I claim herein as 'my invention-` 1. A series of two or more lire-chambers, A A', in combination with a corresponding number of metallurgie working-chambers, one between each two fire-chambers, and one be' vond the last fire-chamber, with a continuous draft through the series, substantially as and for the purposes set forth. f

Y 2. In combination with the series of alternately arranged fire-chambers and workingchambers, having a continuous draft through all, a series of air-blast pipes for supplying air to each fire-chamber and to each workingchamber, substantially as and for the purposes set forth.

3. The described system of fire-chambers, working-chambers, and air-supply pipes, series of alternately arranged firechambers and Working-chambers, having acontinuous draft through all, a flue, h, arrangedL to conduct the waste productsof combustion from the last working-chamber along in contact with one or more steam-generators, and air-blast pipes to supply additional air in s uch iiue h, substantially as and for the purposes set forth.

4. In combination with the second, or other subsequent tire-chamber, A', in a series of firechambers, an inverted bridge-wall or low arch, n, and side bridge-walls b2 and a3, relatively arranged and operating substantially in the manner and for the purposes set forth.

WILLIAM CHISHOLM.

Witnesses: l

J. B. STUBBS, W. O. RUNYON.

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