US290573A - Chimney for furnaces - Google Patents

Description

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D. MGB. GRAHAM'.

UHIMNE'Y FOR PURNACBS'.

No. 290,573. Patented Dec. 18, 1883.

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n.M GRAHAM.

CHIMNBY POR FURNAGBS.

No. 290,573. l Patented Deo. 18, 1883..

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'Unteren Sterns PATENT @erica DAXIEL MCBRIDE GRAHAM, OF CHICAGO, ILLIXOIS.

CHHVINEY FOR FURNACES.

SPECIFICATION forming part oi' Letters Patent No. 290,573, dated December 18, 1883.

ApplicationiledMay1,1883. (No model.) y

To @ZZ whom t mtl/ zj concern:

Be it known that I, DANIEL MoBRiDE GRA- HAM, of Chicago, in the county of Cook, ofthe State of Illinois, have invented a new and useful Improvement in Chimneys for Furnaces, Sac.; and I do hereby declare the same to be described in the following specification and represented in the accompanying drawings, of which- Figure I is a Vertical section of a chimney and a tire-place thereoi` provided with my invention, the nature of which is defined in the claim hereinafter presented. 2 is a like section, exhibiting the chimney and fireplace and their adjuncts as applied to an upright multitubular boiler, as will be hereinafter explained.

The obj ect of the said adj uncts is to abstract by means of air the heat of the smoke and spent Volatile products arising from the com bustion of the fuel, and to introduce such air in its heated state int-o the {fire-place, and to do this either above or below the fuel, or both above and below it, so as to promote combustion of such fuel and the smoke and gases arising therefrom.

The chimney is double walled. In other words, it has an inner wall, b, and an outer wall, a, and between them a space, c, which encompasses the said inner wall, and also extends down alongside of or about the fire-place or chamber of combustion d. This space, by means of a cross-partition, e, arranged just above the fireplace, is divided into two separate chambers, c and c', the upper of Vwhich is closed nea-r or at the top of the chimney.

In thefpart of the chimney which is above the fire-place d isatubular air-heater, A,Which is a drum having tubes f f f, extending up through it from end to end and opening through such ends. In the lower head of the drum is a series of holes, g, for discharge of air into the upper part of theire-place. There is also in the lower part of the air-heater one or more openings, h, leading from the air-receiving space of the drum into the chamber c'. There is also in the lower part of the chamber c one or more openings, t, to allow air to pass into the chamber c. Furthermore, there is also in the upper part of the chamber c one or more openings, it, to lead air therefrom into the drum of the air-heater. There is also one or more openings, Z, leading from the chamber c into the ash-chamber below the grate m ofthe fireplace. In each opening h there should be a damper, o, for closing it, and there may or should be to the opening t a damper or air-register.

4In the operation of the above described chimney and rire-place, the smoke and heated gases proceeding from the fire, when in the chamber d, pass upward through the tubes f of the air-heater to and out of the head of the chimney. In their passage heat is abstracted from them by the said pipes and radiatedinto the drum, whereby the air therein will be raised in temperature, and by the draft upward through the said pipes will be caused to flow downward through the openings g into the upper part of the chamber of combustion, air in the meantime rushing into the hole or -holes t, and upward in the space c, and thence through the hole or holes l; and into the drum.

To the holes g there should be a valve to close them entirely or partially, as occasion may require, such valve being shown at o. On closing the said Valve, in whole or in part, and opening the damper of the hole h, heated air from the drum may be caused to pass into the space c', and thence into the ash-chamber and upward through the grate and fuel, the said air being further raised in temperature by the heat radiated from the walls of the lire-place.

vThe heated air may be let into the upper part of the chamber of combustion, and into the ash-chamber at one and the same time, or into either, as circumstances may require, for the purpose of facilitating combustion ofthe fuel and the smoke and gases arising therefrom.

In Fig. 2 an upright multitubular boiler or steam-generator is shown at B, as disposed within the fuel and smoke chamber d directly over the grate m, there being over this boiler a smoke space or chamber, s, into which the smoke and unburned gases from the fuel pass space c at the sides of or about the lire-place, I such chambers c and c and air-heater being 1c provided with the openings i, 7c, g, h, and l, arranged as and for the purposes speoied. DANIEL MCBRIDE GRAHAM.

Witnesses:

R. H. EDDY, E. B. PRATT.

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