US331277A - Furnace for steam-boilers - Google Patents

Description

(N0 Mudel.) I

R. O. CARPENTER.

. FURNACE FOR STEAM BOILERS.

No. 331,277. Patented Dec. 1, 1885.

UNITED STATES PATENT OFFICE.

ROLLA O. CARPENTER, OF LANSING, MICHIGAN.

FURNACE FOR STEAM-BOILERS.

SPECIFICATION forming part oi Letters Patent No. 331,277, dated December 1, 1885. Application filed July 6, 1885. Serial No. 170,828. (No model.)

To all whom it may concern.-

Be it known that I, ROLLA O. CARPENTER, a citizen of the United States, residing at Lansing, in the county of Ingham and State of Michigan, have invented a new and useful Improvement in Furnaces for Steam-Boilers, of which the following is a specification.

My invention relates to improvements in furnaces which are adapted to the use of coal or coke, and the objects of my improvement are to furnish a supply of air to the unconsumed carbon rising in the form of smoke, soot, and gas from the mass of coal, to deflect the mingled carbons and air from contact with the boiler (which is always at a much lower temperature than that necessary to produce combustion) until the combustion of the carbons shall have been perfected, and to produce a perfect combustion of the gases, smoke, and soot. I attain these results by the device illustrated in the accompanying drawings, in which Figure 1 shows a perpendicular section, and Fig. 2 a horizontal section.

A represents the boiler; B, the outer walls of the furnace. O is a bridge-wall, which is built of refractory material, and is built up close to the boiler, leaving only sufficient space for the expansion of material. Through this bridge-wall are one or more perforations having their combined area equal to or less than the area of the tubes in the boiler above. The bridge-wall I prefer to build quite thick, so as to present a large surface at the apertures. The perforations do not extend to the top of the bridge-wall, but a portion of the solid wall is built above them for the purpose of deflecting the moving air and combustible matter from too near an approach to the body of the boiler. Between the bridge-wall and the front of the furnace-wall I place a grate,G, having an ash-pit below it, as isusual, but so mounted that there is between the front wall of the furnace and the forward end of the grate an open space (shown at S S) having its area about equal to one-half that of the perforations in the bridge-wall. Therequisites of this opening are, that it shall not be clogged by throwing coal or combustibles over it, and that it be constantly kept free for the passage of air; but the opening in whatever form should have an area less than or about equal to one-half the area of the perforations in the bridge-wall, and so constructed that they shall be kept constantly open and free from choking combustibles. A current of air entering through the ordinary damper-openings in the front of the furnace passes in part through the burning coal upon the grate and in part through the aperture S S in front of the grate, and the latter portion, while passing over the coal toward and through the openings in the bridge-wall and there mingling wit-h the unconsumed combustible material rising from the coal, furnishes a fresh supply of oxygen, and promotes complete combustion as the mixed air and combustible material pass through the perforations. The location of the perforations in the wall at a distance below the boiler causes the combustible material to be drawn away from the (comparatively) cool boiler, and prevents the cooling of the gases and their consequent failure to burn. The hot gases, with their combustible material completely burned out, pass on their way to the chimney through the fiues ff, and there part with their heat tothe water surrounding the flues.

The aperture S S can be utilized by the fireman for the ready removal of clinkers, and its presence compels the proper admission of air over the top of the burning coal, in spite of the most careless attention of the fireman.

The grate G may be set either horizontal or raking. I prefer to set it with the rear end lower, as such a setting causes the coal to constantly work backward and away from the aperture S S.

Having thus described my invention and its mode of operation, what I claim as new, and desire to have secured to me by Letters Patent, is

1. In a furnace for steam-boilers, the combination of a grate, set with an aperture between its forward end and the forward end of the furnace-wall, and a bridge-wall of refraetory material, perforated, substantially as bined with a grate set so as to leave an apdescribed. erture at the forward end thereof of a less or 2. In a furnace for steam-boilers, a perfonearly the same area. rated bridge-Wall behind the grate having ROLLA G. CARPENTER. 5 the perforations, substantially as described, In presence ofof an area jointly about equal to two-thirds J. W. MATTHEWS, the area of the fire-flues in the boiler, corn- LUKE O. COLBURN.

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