US335715A - Fire-box for boilers - Google Patents

Description

(No Model.)

T. POORE. FIRE BOX FOR BOILERS.

510.335,?15. V Patented'Feb. 9, 1886.

. [7;ent0w: -Wl'tzwssas: 2; H 4. W v

UNITED STATES PATENT OFFICE,

TOlVNSEND POORE, OF SGRANTON, PENNSYLVANIA.

FIRE-BOX FOR BOILERS.

5PECIPICATION forming part of Letters Patent lN'o. 335,715, dated February 9, 1886.

Application filed April 15, 1885.

To aZZ whom it may concern.-

Be it known that I, TOWNSEND PooRE, a citizen of the United States, residing at Scranton, in the county of Lackawanna and State of Pennsylvania, have invented a new and useful Improvement in Combined Fire-Box and Endless-Chain Grate for Boiler and other Furnaces, of which the following is a specifb cation.

My invention consists, first, in a'fire-box having a feed archway or channel beneath the boilers extending from side to side of the furnace-wall in rear of the ash-pit chamber and in communication therewith; second, in an endless grate supported at its feed end in said archway or channel, passed through the ash-pit chamber, and suitably supported and driven at its discharging end near the front of the said chamber; third, in an endless-chain grate constructed and arranged to move in a direction toward the front of the fire-box; and, fourth, in the combination of the several parts, as will be hereinafter described and claimed.

My invention is designed especially for burning culm or anthracite dust, and it is found that this object can be more effectually accomplished by feeding the fuel upon the grate at the rear of the ash-pit chamber and moving it toward the front of the same in a direction the reverse of the draft of the furnace-and when the grate is thus arranged the archway affords great convenience for the dumping of the fuel in the proper position for handling when the fires require .replenishment, While by having the ashes discharged at the front of the fire-box into a chute every facility for ready handling and removal by barrows or carts is secured.

In the drawings, Figure 1 is a longitudinal section of a boiler and furnace or fire-box with my invention; Fig. 2, a vertical cross-section of the same, and Fig. 3 a front View.

A is a boiler-furnace comprising a steamboiler, B, a fire-chamber, C, and an ash-pit, D. The products of combustion under this construction will pass from the fire-chamber beneath the boiler to the rear of the boiler or boilers and be drawn through a return flue or fines, B, of the boiler or boilers to the front of the furnace by the draft of the stack or chimney A, which is at the front of the fur Serial No. 102,220. (No modelJ nace, and all communication with the stack or chimney cut off during the general operation of the furnace, except through the flue or flues of the boiler or boilers.

The'fire-bridge wall a is formed with a passage, b, of a width and height suitable for the travel through it of an endless-chain grate, E, and in rear of this fire-bridge wall an archway or channel, F, is constructed extending from side to side of furnace-wall and affording entrance back of the bridge-wall a on either side of the furnace; The top or upper exposed portion of this archway is formed of fire-brick and united with the furnace-foundation and the fire-bridge wall in the manner shown, or in any other suitable manner, and is strengthened and sustained by iron girders c, or otherwise properly, as shown.

At the front of the ash-pit chamber a brick extension is made for supporting the shafts of the endless-chain grate, and for forming an ash-chute, G, and in the front wall of the ashpit chamber an opening, d, of a width and height suitable for the travel of the endlesschaiu grate E is formed, as shown, and pendent from the wall of the archway and Wall of the ash-chute are two pivoted self opening and closing doors or plates, 6 f, as shown. The grate B may be a single broad-surfaced endless chain, or it may be composed of a series of endless chains moving independently of one another and together, as may be found most desirable. This endless-chain grate, if a single chain, is supported at its feeding end by a plain drum, H, and at its discharging end by a driving-spider, I, and the shaft of this spider may be extended enough beyond the end of the spider and the outer side of the ash-chute to receive a Oltllkdlitlldl for revolving the spider, and thereby moving theendless chain in the direction of the arrow.

The links of the chain may be provided with ribs 011 their upper surfaces, and also suitably notched or shaped on their under surfaces to insure the wings of the spider taking a firm hold upon them and causing the chain to move, as set forth in my application No. 162,319, filed April 15, 1885, now pending before the United States Patent Office. If the grate is formed of several endless chains, so as to move longitudinally independently of one another, and together, when desi red ,the spider and plain drum will be made in sections and provided with toothed wheels 9, and into the wheels 9 sliding shifting pinions h on a square or other suitable shaped shaft, J, provided with crankhandles, will gear, so as to move either all of the sections together, or any one or any number of them, as circumstances may require, in the same manner as set forth in my aforesaid pending application No. 162,319, filed April 15, 1 885. In either form of the endless grate that portion which supports the fuel will rest upon either rollers 13, as shown, or upon 1ongitudinal fiat-surfaced bars, applied and sus tained by cross-girders let into the furnacewalls, as set forth in my aforesaid pending application. Beneath the upper part of the endless chain aplatform or screen, K, supported by crOssgirders, is applied, so that ashes and live coals may be caught and pre- .above the platform K, in the side of the furnace, doors are provided for admission of air and also implements for cleaning ashes from the platform. The pivoted doors or plates 6 f serve for keeping closed the spaces provided above the grate as the grate with ignited fuel upon it travels in the direction of the arrow. The draft of the furnace is directly opposite to that indicated by the arrow, and hence the new or fresh fuel passing in the direction of the arrow is subjected to the flame drawn by the draft from a bed of red-hot fuel forward of the new or fresh fuel, and a very rapid ignition of the new fuel is insured, and this result is increased by setting the grate so that the fuel will be moved on an upward-m cline plane,as shown. The fuel to be supplied to the furnace is dumped into the archway-of the furnace and supplied upon the rearend of the grate, and as the grate is slowly revolved by the spider and additional fuel fed upon it the fuel first fed upon the grate is carried along chute, and simultaneously therewith fuel is fed upon the grate as in the first instance until a proper quantity of the spent products is discharged and of new fuel is supplied. By this mode the fires are kept going Without raking, an operation which tends to deaden and put out culm fires, and if necessarythe side draftdoors are opened to any extent desired for the admission of air, and at periods these doors are opened and implements are inserted for the purpose of removing ashes and other matters from the platform or screen.

While I have set forth that I contemplate using a series of endless chains forming a grate and moving separately and together, I do not claim under this application such series of endless chains forming a grate and moved separately and together, as that is claimed under my pending application, No. 162,319, filed April '15, 1885; nor do I intend to claim under this application anything claimed in said application.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. A furnace provided with a feed archway or channel beneath the boilers from side to side of the furnace-wall, in rear of the ash-pit chamber and in communication with said chamber, substantially as described.

2. An endless-chain grate supported at its feed end in a feed archway or channel, passed through the ash-pit chamber, and supported and driven atits discharging end near the front of.said chamber, substantially as described.

3. The combination, with a fire-box having a feed-archway in rear of its ash-pitchamber, of an endless-chain grate moving toward the front of the fire-box,an ash platform and screen, K, and side doors, I I, for admission of draft and cleaning implements, substantially as described.

4. The combination of the endless chain grate moving against the draft of the fire-box, the fire-chamber provided with the pivoted doors or plates e f, and the feed archway or channel, substantially as described.

TO\VN SEND POORE.

Witnesses:

JQHN F. SNYDER, HENRY JIFKINs.

Images