US21644A - Improvement in steam-boiler furnaces - Google Patents

Description

` cording to my invention.

NITED STATES PATENT OFFICE.

IMPROVEMENT IN STEAM-BOILER FURNA-CES.

Specification forming part of Letters Patent No. 21,644, dated October 5, 1858.

T0 @ZZ whom t may concern:

Be it known that I, JAMES ALcoEN, J r., of Charlestown, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in BoilerFur naces; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making part of this specification7 in which- Figure l is a central ^longitudinal vertical section of a boiler-furnace constructed ac- Fig. 2 is a transverse vertical section of the same in the plane indicated by the line a: Qc, Fig. l. Fig. 3 is a longitudinal vertical section of the same in the plane indicated by the line y y, Fig. 2. Fig. 4 is a horizontal section of the same in the plane indicated by the line e' ,e of Fig. l.

Similar letters of reference indicate corresponding parts in the several figures.

This invention consists in a novel arrangement of passages for the purpose of causing the return from the back part of the furnace and from the lower part of the smoke-stack to the ash-pit of considerable portions of the smoke and inflammable matters escaping from the fire-box, and the consumption of those matters by causing them to pass through the fire on the grate with the fresh air admitted to produce the combustion of the fuel on the grate.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

K is the boiler, which may be of any construction, butis shown as a plain cylinder.

K is thesetting.

A is the tire-chamber and A3 the grate, with a {ire-bridge A at the back of the grate, and B is an air-tight chamber in rear of the firebridge having no direct communication with the tire-chamber.

C is a false bridge-wall under the rear of the boiler, made with lthree separate cavities C C2 C, the tirstmentioned one C extending all across the bottom of the setting and communicating with the last-mentioned one C3, which is close under the boiler, by means of two upright side passages C4 C4, which are outside of the central cavity C2. The lowest cavity C has an entrance I from the main Iiue U, which extends from the fire-bridge A to the false bridge C,and this entrance I, with the passages C4 C1t and two holes I I in the back of the chamber, constitute the means of direct communication from the fire-chamber to the smoke-stack S. The cavity C2 has an aperture T, communicating with the main Hue U, and furnished with a damper T', operated by a lever T2 outside the furnace, and from the bottom of the said cavity there descend two pipes G G, which are elbowed or bent to run forward and enter the chamberB in rear of the fire-bridge. From the chamber B two pipes E E, doubly elbowed, enter the ash-pit A2.

D is an uprightpipe arranged within the lower part of the smoke-stack, at the bottom of which it connects with ahorizontal pipe H, which runs into the box B. This pipe D, which is open at the top, is contracted in ta perform in a downward direction.

V is a cover placed over the mouth of said pipe D, but a little elevated above the said mouth, so as to leave an entrance thereinto, said cover being made of much larger diameter than said mouth, so as to leave but a small passage outside of itin the smoke-stack, and being made concave on its under side.

The operation is as follows: Fire having been made in the usual wayon the grate and having got well started,there is adirect draft through the main flue U, passages I, C4, and I into the smoke-stack, and the heavier portions of the gases take this course, while the lighter and more combustible gas (carbonio oxide) keeping in the upper part of the main flue U, escapes through the aperture T, chamber C2, and pipes G G to the chamber B, whence it is conveyed to the ash-pit A2 by the pipes E E, and with the air entering the ash-pit passes up through the heated fuel on the grate and is consumed. A portion of the unconsumed gases entering the smoke-stack by the course first described is collected by the cover V of the coue-pipe D and thereby deflected into the said pipe and conveyed into the pipes G, and through it to the chamber B, whence it escapes by the pipes E E to the ash-pit to be supplied to the iire along with that passing through the pipes'G G.

2. The arrangement of the oone pipe D with its delectingcoverV and the pipe I-Lin com.- bination With the chamber B, arranged in rear of and communica-ting with the ash-pit,

substantially as and for the purpose described.

l JAMES ALooRN, JR.

Witnesses:

GEO. P. KETTELL, GEO. B. THOMAS.

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