US658703A - Smoke-consuming furnace. - Google Patents

Description

Patented Sept. 25, I900.

J. A. CRAWFORD.

SMOKE CUNSUMING FURNAOE.

2 Sheets$heet l.

(No Model.)

(Application filed Nov. 4,1899.)

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| u H z /Z Y3 E WITNESSES No. 658,703. Pa tented Sept. 25, moo;

J. A. CRAWFORD.

SMOKE CONSUMING FURNACE.

(Application filed Nov. 4, 1899.\

2 Sheets-$heet 2.-'

(No Model.)

3440M Foo m: Norms wnzns cu. PNOYO-LITHQ. wAsumumM o c UNITED TATES PATENT OFFICE.

JOHN A. ORAVVFORD, OF ALLEGHENY, PENNSYLVANIA,

SMOKE-CONSUMING FURNACE.

SPECIFICATION forming part of Letters Patent No. 658,703, dated September 25, 1900,

Application filed November 4, 1899. Serial No. 735,786. (No model.)

To all whom it may concern.-

. Be it known that I, JOHN A. CRAWFORD, a citizen of the United States, residing at Allegheny, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Smoke-Consuming Furnaces; and I do hereby declare the following to bea full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has relation to smoke-consuming furnaces; and the objects are, first, to provide a smoke-consuming furnace which is simplified in construction, efficient in operation, and durable in use; second, to provide such a furnace which presents an improved preservative construction, whereby the respective elements are prevented from being destroyed by the caloric effects of the burning gases and flames, and, third, to provide improved means for regulating the drafts to the air-pipes opening from the ash-pit.

With these purposes or objects in view my invention consists in the novel construction of parts and their combination, as will here-' inafter be fully described, and particularly and distinctly pointed out in the claims.

I have fully and clearly illustrated myimprovements in the accompanying drawings, wherein Figure 1 is a vertical section longitudinally through the furnace and inner face of one of the side walls thereof, showing air-intake fiues leading from the ash-pit, the gas-fines leading from the fire-chamber, and the air and gas pipes opening above into the firechamber, also showing the air-intake and gas and air discharge pipe. Fig. 2 is a vertical transverse section through the side Wall, showing the gas channel or chamber, the figure being taken on the line 2 2 of Fig. 1. Fig. 3 is a vertical transverse section taken centrally through the draft-box and vertical flue, as indicated by the line 3 3 of Fig. 1. Fig. 4 is a horizontal section on the line 4 4 of Fig. 1. Fig. 5 is a detail central longitudinal section through one of the draftboxes, showing the rod-to operate the draft slides or damper. Fig. 6 is a similar view to Fig. 5, taken at cross-section thereto.

Referring to the drawings, A A designate the side walls of the furnace; B, the front wall; 0, the grate-bars, and D the bridge-wall.

In the side walls of the furnace leading from the ash-pit E into the side walls are formed air-fines 7, leading into the walls at right angles and then vertically in the walls, as shown in Fig. 3 at 8 and indicated in dotted lines in Fig. 1, and opening at their upper open ends into a horizontal gas chan nel or chamber 9, extending longitudinally in the walls on a plane above the grate-bars, as shown, and leading into this gas channel or chamber are a plurality of oblong narrow fines 10, opening from the fire-chamber into the gaschannel 9. as shown in the drawings.

In the longitudinal portions of the air-intake fiues 7 are arranged and fitted metal boxes F, the bodies of which are of a contour to slide into and fit the front portion of the fines and about their outer edges are formed with grooved flanges 11, in which is slidingly fitted a plate-damper 12, arranged to close the opening 13, leading into the boxes or sleeves F. The opening 13 is preferably smaller in area than the area of the flues and bodies of the boxes. The fines 7 are arranged intermediate of the flues l0 inorder that the draft from fiues 7 will intersect the gas-channel remote from the fiues 10. and the upper gas and air pipes, when the latter are used, will be remote or a sufficient distance to remove them from the direct action of the hot flames and gases when the air and gas pipes or fines are used or brought into requisition.

It will be perceived that, so far as the invention has been described, a complete and efiective combustion and smoke consumer is afforded. The air being taken from the ashpit and delivered to the fire-chamber promotes combustion in the latter to efiectually eliminate the smoke by enhanced caloric effects.

Suitably seated in the walls, with their lower ends opening into the gas-channel and registering with the vertical portions or branches of the flue 7, are air and gas pipes G, extending vertically, as shown in dotted lines, and formed with downwardly-inclined ends g, opening through the face of the wall into the fire-chamber above the gas-channel fines. When these gas and air pipes are used, the operation is as follows: The air from the ash-pit is taken up through the air-intake fines therein and is carried up into the air and gas tines. At the same time a side draft is created from the fire-chamberthrough the fines into the gas-channel, the gases being'led in the channel into the gas and air pipes into the fire-chamber to promote combustion and consume the smoke.

In the bridge-wall is formed a gas-channel 14, which at the ends is in communication with the gas-channels in the side walls, and

leading into this gas-channel 14 are fiues 15, opening from the tire-chamber, and opening from the ash-pit are air-fines 16, which intersect the bridge-wall gas-channel by means of vertical branches 16, as shown in the drawings. At the upper end of these air-fines in the bridge-wall over the gas-channels are placed gas and air pipes 17, similar in construction to the pipes in the side walls, and seated with their bases substantially on a line with the gas-channels and their inclined u pperends directed forward and opening into the fire-chamber at the front of the bridgewall, the object being to provide additional means for promoting combustion in the firechamber. The entrance or flow of air into the fines in the bridge-wall is regulated by means identical to those used for regulating the draftin the fines and pipes in the side walls.

It will be perceived that in the construction and arrangement. of the elements of my improvement or invention I have provided a device which may be efiectively used without or with steam jets to promote the draft and delivery of the gases and air to the fire-chain her. If steam-jets are desired, they can be readily and conveniently applied in any manner within the skill of the mechanic.

What I claim is- 1. In a s|n0l e-consuming furnace the combination of the side walls formed with longitudinal gas-chan nels l cated above the gratebars, gas-fines leading, from the fire-chamber and intersecting the gas-channels, and air- .flnes opening from the ash-pit and intersecting the gas-channels intermediate of the gasflnes, air and gas pipes placed above the gaschannels and opening at their base into the gas-channels and registering with the upper ends of the air-fines, and formed with downwardly-inclined branches opening into the fire-chamber, metal boxes in the months of the air-fines in the ash-pit, and slides to adjustably close the mouths of the metal boxes, substantially as described.

2. The combination with the side walls formed with longitudinal gas-channels and gas-fines opening therein from the fire-chamber, of the bridge-wall formed with a gaschannel communicating at its ends with the gas-channels in the side walls, gas-fines in the bridge-wall opening from the fire-chamber and intersecting the gas-channel, air-tines opening into the bridge-wall from the ash-pit and interseotingthe gas-channel in the bridgewall, air and gas pipes in the bridge-wall having their bases opening into the gas-channel therein and formed Wit-h down wardly-inclined and forwardly-directed ends opening intothe fire-chamber, substantially as described.

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

JOHN A. CRAWFORD.

Witnesses:

CLARENCE GoBIN HEYLMUN, E. H. BATES.

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