US312655A

US312655A - Nathaniel w

Info

Publication number: US312655A
Authority: US
Publication date: 1885-02-24
Anticipated expiration: 1902-02-24

Description

(No Model.) N. W. PRATTKE G. E. PALMER.

1 FURNACE FOR THE COMBUSTION 0P BITUMINOUS GOAL.

No. 312,655. Patented Feb. 24, 1885.

W NESSES: INVENTORS W W 2 r I BY "WWW W W ATTORNEY Nrrn STATES. PATENT NATHANIEL W. PRATT, OF BROOKLYN, NEWV YORK, AND GEORGE E. PAL- MER, OF CHICAGO, ILLINOIS, ASSIGNORS TO THE BABGOOK & \VILOOX COMPANY, OF NEW JERSEY.

FURNACE FOR THE COMBUSTION OF BlTUMlNOUS COAL.

SPECIFICATION forming part of Letters Patent No. 312,655, dated February 24, 1885.

(No model.)

To aZZ whom it may; concern:

Be it known that we, NATHANIEL W. PRATT, of Brooklyn, in the county of Kings and State of New York, and GEORGE E. PALMER, of Ohicago, in the county of Cook and State of Illinois, have made a joint invention of certain new and useful improvements in furnaces for the combustion of bituminous coal or fuel having similar characteristics; and we do hereby 1Q declare that the following is a full, clear, and

exact description and specification of the same.

Our invention is especially applicable to furnaces where such fuel is used for the generation of steam; and its object is to secure as much as possible of the heating value of the fuel by retarding the escape of the hot products of combustion, and securing their proper application to the surfaces tobe heated, and their even distribution over such surfaces. In order to fully and clearly illustrate our plan of construction, and as our invention includes also an advantageous method of applying it to water-tube boilers, we have shown it in the accompanying drawings, and will pro- 2 5 ceed to describe it in connection with so much of such a boiler as is necessary to illustrate the manner of so applying and distributing th heat.

In said drawings, Figurel showsa sectional side elevation of said furnace, and Fig. 2 a front sectional elevation, showing a single and double furnace.

Ais the combustionchamber,into which the fuel is fed in the usual manner, and is formed 3 5 by the grate G and the side walls supporting an arch, J. This grate G is preferably dropped at the rear end for the purposes of facilitating combustion and also obtaining an enlarged furnace-area without increasing the grate-surface. 0 From this combustion-chamber A a contracted opening, H, leads into the retarding-chamber B, the rear wall, L, of which forms the base of a bridgewall, (separating the water-tubes,) and the crown D,which is in this case formed 5 of brick, as shown at N, surrounding and supported by the. water tubes. From the retarding chamber a contracted opening, I, smaller than the opening H, leads between the arch J and the crown D into the distributingchamber 0, where the furnace products, after having ample time for combustion and combination, and having therefore passed only over fire-brick surfaces, are finally distributed over the surfaces upon which they are to act.

It is very desirable in the case of furnaces of great Width,frequently used for boilers of large capacity, to avoid cooling of the whole of the furnace at once by opening a firedoor, and it is alsodesirable to gain strength and durability by making the arches J J as narrow as pos- 6o sible. WVe accomplish both these results by the means of double furnace, (shown in Fig. 2,) where M is a mid-- wall running parallel with the grates, and dividing the furnace into two portions covered by two arches abutting against said mid-wall. Both divisions connect with a common retarding-chamber constructed as already described, the said retardingchamber opening into the distributing-chamber.

By arranging the combustion and distributing chambers separatedby a solid or imperforate arch or arches in the same vertical plane, and by placing the retarding-chamber at the rear of the combustion and distributing cham- 7 5 bers, partly above the one and partly below the other, so as to communicate with both,we secure compactness with excellent results, the opening from the retarding-chamber into the distributing-chamber being preferably smaller than the opening from the combustion-chamber into the retarding-chamber to impede the passage of the gases somewhat, and thus insure more perfect combustion.

\Ve claim as our invention 1. In a boiler-furnace, the combination of combustion and distributing chambers, both arranged in the same vertical plane, an arch separating said chambers, a retarding-chamber arranged entirely rearwardly of the said-con1- o bnstion and distributing chambers, and having at its top a fire-brick crown sustained by the lower heating-surfaces of the boilers, the passage-way between the distributing-chamber and the retarding-chamber being smaller than the passage-way between the latter chamher and the combustion chamber, substantially as set forth.

ber, and a distributing chamber arranged above the said combustion-chamber, said re tarding and distributing chambers being both 15 common to the several compartments of the combustion chamber, substantially as set forth.

NAT. WV. PRATT. GEORGE E. PALMER.

Witnesses:

J OHN E. EUsTIs, Gno. A. HOWELL, JOHN W. PAGE, MILTON THOMAS.