US2394975A - Furnace - Google Patents

Description

Feb. 19, 1946:

J v. BOLAND ET AL FURNACE Filed June 1, 1942 Patented Feb. 19, 1946 7 FUnNAoE j Y John ,V..Bol and and nraaieynurton, St.

Louis,

-Mo.; sai d,Burton assignor to said Boland 1 Application June-1, 1942, Serial. No. 445,302

-This:invention relates to, furnaces; and has special reference tothe prevention of the formation of clinkers along the walls of-theflrebox, and to the promotion of combustion.

In coal burning furnaces, irrespective oftlie types of grates that are used, it is common experience that clinkers are formed along and in connection with the side walls within the firebox.

of the furnace. These clinkers along the side walls of'the firebox reduceand restrict the area immediately above the, grates and prevent burning of the coal throughout ;the full width of the grate. "It is necessary to remove these clinkers from time totimeby the use of slice bars or other implements, and such-repeated removal eventually breaks the-faces of the firebrick,,initiates deterioration of the firebrick, and requires frequent and costly repairs. i

Objects of the present invention are to provide an apparatus or equipment for use in coal burning-furnaces'using;different types of grates that will substantially prevent, or largely reduce, the formation of clinkers on and along the side walls of the furnaces, thereby avoiding the necessity of removing clinkers by the use of slice and damage by combustion of the coal in the furnace.

Another. object of the invention is to providean apparatus including pipes arranged in the furnace and having discharge ports for steam admitted into or forced through said pipes, so that the steam will be discharged in jets along and against the side walls of the furnace to prevent the formation of clinkers and substantially pro,- mote combustion of the coal, and also dispense with the use of slice bars and the like for the removal of clinkers, thus preventing damage to the firebrick and other parts of the furnace.

the coal, and generally prolonging the life of the furnace structure; and particularly the metallic parts that are'usually damaged by combustion.

Other objects will be apparent from the follow-.- ing Y description, referencebeing madeto the annexed drawing, in which- .1.

Fig. 1 is a front elevation of a'furnace equipped with the present invention. a

Fig. 2 is a vertical sectional view transversely of the lower portion of the furnace, showing the invention embodied in a furnace having'a grate of the chain type. 1 Fig. 3 is an enlarged fragmentary sectional view; similar to Fig; 2,-but showing more clearly the arrangement of the steam'injection pipe relative tothe chain grate. i The present invention is contained in a furnace having a movable grate H ofthe chain type mounted in a combustion chamber-formed by walls 2 composed of firebrick. Cast'iron plates I [extend along the-sides and across the rea'r of the combustion chamber slightlyabove but approximately in the plane of the upper side of the grate II and at the under side of a ledge l3 extending continuously along the sides and rear of the combustion chamber. This provides spaces l4 along the two sides and along the rear of the combustion chamber in which the pipe [5 is mounted. The spaces M are obtained by spacing the lower portions of the two side walls below the plates l2 a greater distance apart than the upper portions of said side walls, and forming longitudinal inwardly extending ledges at the unions of said lower and upper portions of said walls. The metallic plates I! that are embedded in said side walls extend inwardly beyond the inner surfaces of said lower portions of said side walls and cover the lower sides of said ledges. The pipe I5 is located below the plane of the upper surface of the grate l l, below the ledge l3 and the inwardly extended portion of the plates l2, and above the shaft l6 which extends through leaves the space below the grate H wholly unobstructed, and is formed with a longitudinal series of holes I! through the upper side thereof. Said holes are preferably of uniform size, about one-fourth inch in diameter, and spaced apart I about two inches from center to center. The twoside portions or stretches of the pipe l5 extend through 'the front wall 8 of the furnace and have communication with a source of steam supply, either exhaust steam or live steam, as desired, through pipe connections 9 equipped with valves III to regulate the amount of steam passing to said pipe l5, and to permit or prevent the passage of steam to said pipe as desired. The steam may be generated in a boiler heated by the furnace. The steam jets ejected through the series of holes I! pass upwardly between the inner edges of the plates l2 and the adjacent sides of the grate l l into coal extending laterally from the uppersurfaceof said grate across said spaces l4 tothe plates l2 and to the side walls 2 above the ledges l3. Said steam tempers the coal along the sides of the combustion chamber, thereby promoting combustion of said coal and substantially preventing or largely reducing the formation of clinkers on and along the side wallsv of the combustion chamber. This avoids the I necessity of removing clinkers by'use of slice bars or other implements that. break the faces of the firebrick and cause deterioration of the furnace structure.

The location of the pipe l5 wholly within the spacesl4-and in a position leaving the space below .the grate II wholly unobstructed, provides several advantages. It leaves the grate freely operative and movable without interference by said pipe. The grate may be removed and replaced and repaired more conveniently than if the pipe extended into the space below the grate or into the space between the upper and lower portions of the grate. The pipe may be removed and replaced without interference by the grate and without difficulty in extending the pipe into the space within or below the grate. The holes in the upper side of the pipe are at all times accessible regardless of the grate When the furnace does not contain fuel or the remnants of fuel after combustion.

.Fromthe foregoing, it is apparent that this invention attains all of its intended objectives and purposes efficiently, economically and satisfactorily. The invention may be added in furnaces already constructed, or included in furnaces during their initial construction and as a part of the permanent equipment thereof. The arrangement of the invention may be varied within the scope of equivalent limits Without departure from the nature and principle of the invention as defined by the appended claim.

We claim: In a furnace having a rear wall, a front wall, and two side walls composed of firebrick cooperating with said rear and front walls to form a combustion chamber, said two side walls having lower portions spaced apart a greater dis- 7 tance than the upper portions thereof and having longitudinal inwardly extended ledges at the unionsof said lower and upper portions of said side walls; metallic plates embedded in said side Walls and extending inwardly beyond the inner surfaces of said lower portions of said side walls and forming the under sides of said ledges, a movable chain type grate mounted in said chamber between said lower portions of said side walls and having its upper surface approximately in the same plane with said plates and having its twolongitudinal sides separated from said lower portions of said side walls by intervening spaces, a shaft for operating said grate, and steam pipes extending along and within said spaces between the sides of said grate and said lower portions of said side walls above said shaft and under said ledges and below the plane of the upper surface of said grate and having longitudinal series of holes in their upper sides for discharging steam upwardly between the inner edges of said plates and the adjacent sides of said grate into coal extending laterally from the upper surface of said grate across said spaces to said plates and said side walls above said ledges.

JOHN V. BOLAND. BRADLEY BURTON.

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