US339143A - Steam-boiler furnace - Google Patents

Description

2 Sheets-Sheet 2.

(No Model.)

J. GANNAN. STEAM BOILER FURNACE. No. 339,143. Pa't'ented Apr. 6, 1886 Jinesaes. Irv-u .16 M. W M

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llhvrrnn STATES PATENT OFFIoE.

.TAllIE-S GANNAN, OF FLGIN, ILLINOIS.

STEAM-BOILER FURNACE.

SPECIFICATION forming part of Letters Patent No. 339,143, dated April 6, 1886.

App ication filed November 21. 1885. Serial No. 183,516. (X0 model.)

To (LZZ whom it may concern:

Be itk n own that I, JAMES OANNAN, of Elgin, in the county of Kane and State of Illinois, haveinvented certain new and useful Improveinentsin Steam-BoilerFurnaces; and Idohereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, and to the figures and letters of reference marked thereon.

My invention has for its object to further utilize theheat and the products of combustion from the fires employed to heat gas-retorts in the manufacture of illuminating gas; and it consists in a certain arrangement of devices whereby the heat and products passing around the retorts are conveyed to a steam-boiler or other suitable furnace and there used again for generating steam, and also in certain improved devices for maintaining a constant flow of the heated airand products of combustion, all as will be hereinafter described.

In the accompanying drawings, Figure l is a cross sectional view of an ordinary gasgenerating furnace, showing a portion of my invention. Fig. 2 is a longitudinal sectional view of the same, taken on the line a m of Fi 1. Fig. 3 is an end, and Fig. 4. a longitudinal sectional, view of a steamboilcr furnace provided with my improvements.

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

Referring to Figs. 1. and 2, A represents the hot-air chamber of the generatingfurnace, and B B I; the retorts placed therein and preferably over the fire, as shown. The heated air and products of combustion, rising, pass over and around the retorts to the back end of the chamber A, and then return to the front end in the lines (I) beneath the two lower retorts, then pass backward in the flue D to the chimney or stack 1), where they are usually discharged into the open air. The temperature of the heated air and products when discharged into the chimney is veryhigh, havingbeen lowered very little, if any, by their passage through the several flues, as the walls of the latter are highly heated, and they have heretofore been discharged into the open air without being utilized in any manner; but by my invention, instead of allowing this heat to pass up the chimney,I provide a flue or conduit,F,and a damper,

E, pivoted to the back of the chimney, adapted when moved to the position shown in full lines in Fig. 1, to cause thehot airand products from the furnace to pass downward into the flue or conduit F, extending, preferably, beneath the surface of the ground to a steamboiler or other suitable furnace, constructed as shown in Figs. 3 and 4. From the horizontal fine or conduit F there rises a fine, G, extending up into the space H beneath the boiler (in the furnace shown in Figs. 3 and 4) just back of the grate I. The upper end of this flue G is adapted to be closed, when desired, by a tile dooror damper, J, operated by means of a rod, j extending through a tube, j, preferably placed between the grate-bars of the furnace. At the back end of the grate is provided a tile partition, K, which is removable, and is for the purpose of preventing the admittance beneath the boiler of cold air through the fire'chamber. The heat enteringthe space H from the flue passes backward beneath the boiler X and forward again through the tubes of the same to the front of the furnace, where it enters the chamber Y and is discharged into the chimney or stack L.

The object in placing the rod for operating the damper J in the tube between the gratebars, and in providing the removable partition K,is to admit of a fire in the grate of the furnace while repairing the conduit F, for instance, or any other purpose, and all that is necessary to fit it for operation is to close the damper J and remove the partition K, as will be readily understood.

In order to assist in maintaining a draft through the conduit F from the generator toward the furnace, and also to provide for the generation of a highly-combustible gas, I place in the lower flue, D, of the generator a tile pipe or conduit, M, extending from the front of the furnace to the rear and downward a short distance into the flueF, having a flaring mouth, M, and place a small steamjet, N, therein for drawing in through the flaring mouth the cold external air and discharging it, together with the superheated steam and gases,into the conduit F at the rear of the generator. An opening having asuitable damper, 01.,is provided in the pipe for admitting asuitable quantity of the heated air and products of combustion to combinewith the external air and form a highly-combustible gas, which will burn with intense heat at the end of thetube, thus not only assisting the draft, but also adding to the heat in the conduit F.

The operation of the device will now be apparent. When the fire in the gas-generatoris first started, or it is not desirable or necessary to have the boiler-furnace heated from it, the damper E is turned to the position shown in dotted lines in Fig. 2, and the heat and products allowed to pass up the chimney D; but when it is desired to heat the boiler-furnace the damper is turned to the position shown in full lines, and, if desired, the steam-jet N is opened, forcing in air and steam through the highly-heated pipe and generating a combustible gas, which burns in the conduit F. The valve J at the end of the conduit being open, the heat and products pass up under the boiler and back through the tubes thereof, and are finally discharged into the stack L.

The advantages gained by the employment of my invention are numerous and will be readily understood. For instance, I am enabled to utilize heat and gases heretofore wasted, and to produce a higher degree of heat than can be produced with a bed of coals directly under the boiler.

I claim as my invention 1. The combination, with a gas-generating apparatus and the furnace thereof, of a conduit leading from said furnace to the combustionchamber of a steam-boiler, and a supplemental conduit within the first-mentioned conduit and communicating therewith, into which a portion of the gases are diverted and mingled with air, steam, or other material, wherebya combustible gas will be generated and a more perfect combustion of the gases and products from the gas-generating furnace will be secured, substantially as described.

2. The combination, with a gas-generating apparatus and the furnace thereof, of a conduit leading from said furnace to the combustion-chamber of a steam-boiler or other furnace, a supplemental conduit placed within the former and communicating therewith and with the external air, and having a steam-jet therein,and a damper for regulating the amount of hot air and gases admitted to said supplemen tal conduit, substantially as described.

3. The combination, with the furnace, of a gas-generator, the conduit F, the supplemental conduittherein communicating with the external air, and the steam-jet, substantially as described.

4. The combination, wit-h the furnace, of a gas-generator, the conduit connecting it with a steam-boiler or other furnace, the damper J, having the operating-rod extending to the outside of the furnace,and the removable partition K, substantially as described.

- JAMES CANNAN.

\Vitnesses:

EZRA RUE, F. J. FOSTER.

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