USRE10639E - Franklin b - Google Patents

Description

P. B. GIESLER.

Assignor of one-half to A. LDGEMANN.

SMOKE OONSUMING FURNACE.v

No. 10,639. Reissued Aug. 25, 1885.

U ITED STATEs PATENT OFFICE.

FRANKLIN B. GIESLER, OF MILWAUKEE, WISCONSIN, ASSIGNOR OF ONE- HALF TO ADOLPH L'OGEMANN.

SMOKE-CONSUMING FURNACE.

SPECIFIC A TION forming part of Reissued Letters Patent No. 10,639 dated AugustZS, 1885.

Original No. 313,011. dated March 3, 1885. Application for reissue filed July 16, 1885.

figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in smoke-consuming furnaces; and it pertains to that class in which an exhaust-fan or other ar-' tificial draft is used to return the smoke and other products of combustion which would otherwise escape through the smoke stack back to the eombustionrchamber'.

Heretofore it has been common to connect the return-pipe of an exhaustfa-n with the combustion-chamber of the furnace, whereby all the products of combustion have been re peatedly and continuously passed around the circuit from the furnace to the exhaust-fan and from the exhaust-fan back to the furnace, thereby affording no means for the escape 'of the gradnally-accumulating heavy non-combustible gases, which gases 'as they accumiflate displace and prevent the admission of therequired quantity of oxygen to maintain combustion.

The object of, my present invention is to provide a device for carrying off the surplus accumulation of heavy or lessconibustible gas and other products of combustion thus. accusired object is not necessarily. limited to the precise form and arrangement of elements or devices shown. My invention is, however,cx-

plained by reference to the accompanying drawings, in which- Figure 1 is a front elevation of a furnace embodying my invention. Fig. 2 isa vertical 1ongitudinal section through the center of the furnace, and Figs. 3 and 4 are details.

A is the furnace, having the usual boiler, B.

O G are doors that open in the combustionchamber, and O O are doors that give access to the draft chamber beneath the grate, and from this draft-chamber one or more short flues, D, lead into a horizontal flue, D, which latter is connected atone end with a blower, E, or other artificial draft, and, at the other has an exhaust-pipe, E, leading down into it. A flue, D, is preferably provided as a separation-chamber, into which all the products of combustion exhausted from the furnace aredischarged, and in which the heavier or less combustible products of combustion are separated from the lighter. The precise form or location of the chamber or flue D is not material. It is, however, preferably made of considerable depth, so that the separation of the light and heavy gases may be more perfectly V accomplished. As shown in .Fig- 1, the exhaust-pipe E,through which the gases escape, has its mouth preferably near the bottom of said due or chamber, so that thevheavier gas will escape through it, while the lines D D, leading to the combustion-chamber, have their mouths preferably near its upper extremity, so as to conduct the lighter gas only therefrom. It is obvious that as the exhaust-pipe E is connected with the smoke-stack abovea closed damper, it is impossible-for the gas thus conducted away to be again returned to the furnace. It is in material,'however, whether the pipe E is connected with the smoke stack or terminates directly in the open air.

F is a smoke-chamber, which is connected with the furnace by a due, F, and with the artificial draft or blower E by a pipe, F.

G is the smoke-stack, which is provided close to its point of connection with the smokechamber with-the damper g, a slight distance above which the exhaust-pipe E enters t c said smokestack. Another damper, f, is ii ted .in the pipe F closcto the smoke-,cham ber. Also connected with the exhaust side of said fan is a duct or passage, F, to admit fresh air through a regulating-valve, f, and from thence to the combustion-chamber. The short flues D D, which connect the horizontal flue ries an adjustable weight, e, and is projected far enough toward the furnace to come in the line of travel of a plate or rod, a, that is freely connected to the crank a of the shaft A, carrying the cone-pulley a, mounted with its companion pulley, aflin any suitable form-of hanger on the corresponding side of the furnace.

The cone-pulleya is connected in any suitable manner with the driving mechanism.

, In the. center of the combustion-chamber I provide a flue, H, of any suitable form, but

I preferably of the shape shown in Figs. 3 and 4. This flue extends the whole length of the firebed, its closed bottom resting .on'top of the grate-bars h h. In the upper part of this on each side. A passage, H is formed in the front of the furnace, between the doors O, to adinitf fresh air from the outside to said flue H through a corresponding opening, H in the end wall of the flue, and this passage has a trapdoonH, which maybe kept more or less open by means of any form of adjustable latch in use.

anism. I a v The operation of my device is as follows: \Vhen the furnace-fire is. first lighted, the damper g in the smoke-stack G is opened-and the smoke passes out in it until sufficient steam has been raised to operate the blower; but when this occursthe damper g -is-closed, and the dampers f of pipe F, as well as the dampersf f in the short flues D, being'open,

theblower will draw the smoke from the chamber F and force it through the fluelD and its branches 1) and into the combustion-chamber,

' together with acertain quantity of fresh air that isinduced in the same time through the small flue F the amount of air thus admitted being regulated by means of the valve f.

The valvee in the lower end of the eXhaust pipe E is lifted at intervals, determined by the position of the belt thatcon nects the cone-pul leys a. and a,andthis intermitting opening will .pe rmit the oarbonicacid gas and surplus smoke to pass out and away. This valve may, moreover, be set so as always to be partly open, so that there may be a constant draft that will carry off the carbonic-acid gas in flue D, while the smoke is' forced through the fire box to-form part of the fuel. As; the fresh air admitted through the door H and opening or passage 5 H into the flue H becomes sufiieiently heated,

flue a series of perforations, h-h' h h, are made Patent, is- TheblowerEis belted in any suitable man- 5 nor, as at pulley, E, with the driving mechupper portion of t-l1e"said-' flue,'and, besides producing a current that powerfully induces. the return-smokethrough the fire-bed, it contributes it's additional volume of oxygento [it rushes? up through the perforation inthe materially aid the combustion of of the gases.

If, asabove stated, the damper eis adjusted partially open, so that the heavier gas can escape, the damper-operating mechanism a may under suchcir'cumstanccs be. dispensed with.

I am aware that an exhaust-pipe located in a smoke-receiving chamber between the furmace and the inlet or exhaust side of the exhaust-fan has previously been made, as shown in Patent No. 16,317, of December 23, 1856, and I therefore make no claim -to anexhaus't so" located,--but, instead, only as located between the outlet or return side of the fanv and the combustion-chamber, as shown and described inmy specification. I Havingthusdescribedmy invention, what I claim as new, and desire to secure by Letters 1. The combination, in a smoke-consuming furnace having an exhaust-fan or artificial draft, of an exhaust-pipe communicating from the furnace with the exhaust-side of said fan or artificial draft, and both a return and an es- 1 cape pipe communicating from the return side of said fan or artificial draft, respectively, one

withthe furnace and the other with the ante rior air, substautially'as-and for the purpose specified.

2. The combination, with a furnace, 'of pipes D,'D, F, F, and F, the reservoir and blower-" .pipe E, and its valve, and mechanism for lifting the latter at intervals, substantially as described.

' 3. In a smoke-consumer, the combination,

with the furnace A, the horizontal flue D, and

' its branches D D, of achamoer or fine formed above the grate-bars in the center and the whole-length'of the furnace, and having its closed bottom resting on the grate-bars, suit able perforations on each side, near its top,

and an'adj ustabl'e door opening in the furnace front, substantially as and for, the purpose set forth.

In testimony whereof I affix my signature in j presence of two witnesses.

FRANKLIN B. GI'ESLER.

Witnesses:

ADOLF Hnnnnenu, HARRY M. WORK.

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