US380706A - Limekiln - Google Patents

Description

(No Model.)

J. H' WALLSTROM. 2 Sheets Sheet 1.

LIMEKILN.

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J. H. WALLSTROM.

l LIMEKILN. No.7380,706. Patented Apr. 10, 1888..

n AQ* w VW" 1 Invanvr UNITED STATES PATENT OFFICE.

JOHN H. VALLSTROM, OF ROCKFORD, ILLINOIS.

LIMEKILN.

SPECIFICATION-forming part of Letters Patent No. 380,706, dated April 10, 1888.

Application tiled August 1B, 1887.

.T0 @ZZ whom it may concern.-

Be it known that I, lJol-1N H. WALLsTEoM, a subject of the King of Sweden, and residing in the city of Itockforthcouuty of Vinnebago, and State of Illinois, have invented certain new and useful Improvements in Limekilns, of which the following is a specilication.

This invention relates to a class of limeburning kilns known as the perpetual kiln,77 and it is of a variety in which the fuel-combustion chamber is separated from the chamber containing the limestone to be burned, and in which the gases produced in the fuelcombustion chamber pass through iues into the chamber containing the limestone, and in connection therewith is ignited to burn the 'stone to linie.

The object of this invention is to improve this class of kilns to render them more eflicient, and to this end I have designed and constructed the kiln represented in the accompanying drawings, which I now proceed t0 describe, and in which-- Figure 1 is an elevation of a kiln. embodying my invention. Fig. 2 is avertical central section on dotted line a on Fig. 5. Fig. 3 is a vertical section on dotted line b on Fig. 9. Fig. 4 is an end elevation of the fuel-combustion chamber. Fig. 5 is a horizontal section on dotted line c on Fig. 2. Fig. 6 is a horizontal section on dotted line d on Fig. 2. Fig. 7 is a horizontal section on dotted line e on Fig. 2. Fig. S is a horizontal section on dotted linef on Fig. 2, and Fig. 9 is a horizontal section on dotted line y on Fig. 2.

The kiln-stack is preferably of circular form in plan, with lateral projections l, extending on opposite sides of its base portion, forming the fuel-combustion ch ambers 2, each of which is provided with an inclined fire grate, 3, in mill-stair form,the several grate-bars ofwhich are provided centrally with vertical supports. The'outer portions of the lateral projections 1 are supported on the several sides of their external angles by vertical clamping bars 4, held in place in the usual manner by means of holding-bolts 5, built in the walls ofthe l chambers.

Serial No. 247,260. (No model.)

covers to admit the fuel which is dropped through the ports onto the fire-grates, and the covers put in place prevent the escape of gas through the ports.

Gas fines 7 rise from the inner end' of the combustionchambers and connect with annular gas-fines 8, which extend around or nearly around the furnace-chamber 9 of the kiln 6o within thefurnace-walls, and vertical gas-lines 10 connect the annular fines with a series of radialgas-flues, 11, which extend through the furnace-walls and open upward into the furnace. A series of radial air-fines, 12, extend through the furnace-walls above the gas-fines 11 and open upward into the furnace above the inner openings of the gas-fines.

Metallic bands 13 surround the furnacewalls above and below the outer end openings 7o mix with the gases rising from the combustion-chambers through the flues into the furnace, to insure the most perfect combustion of the gases within the furnace.

The radial iues also serve to permit the inspection of the interior of the furnace at 8o the points of greatest combustion of the gases, and permit the attendant to stir the contents of the furnace by means of suitable stirring implements passed through the radial iiues.

A central core, 15, is built in the base portion of the furnace, and in this instance the core rises to about the height of the air-fines to narrow the space for the passage of the limestone between the inner walls of the furnace and the core at the point of greatest com- 9o bustion of the gases, which isafavorable construction when the limestone to be burned is broken quite line; but when it is desirablel to burn the lime in larger stones I prefer that the core shall not rise above the under face of the air-lines, as represented in the dotted lilies in Figs.2 and 3, to enable the attendant to stir the contents of the furnace above the core. The portion 16 of the combustion-chamber under the grate-bars forms the ashpit, and Ico the external openings provided with doors 17 permits the attendant to stir or rake the lire through the grate-bars and remove the ashes from the pit, and by means of registers in the doors to the ash-pit the admission of air to the combustion-chamber under the gratebars may be regulated to produce the greatest amount of gas to be ignited in its passage to the furnace.

Draw-openings 18 are formed in the base portion of the kiln on opposite sides thereof, through which the burned lime is drawn from the kiln, and doors 19 are provided to close their external openings.

The central section, 20, of the kiln is preferably built in hexagonal form in section, and is bound at proper intervals by beams 2l,ship lapped and bolted at their crossings.

The upper section, 22, of the kiln is a truncated hexagonal pyramid in outline, and is provided at its base with a door, 23, through which the limestone to be burned is fed into the kiln.

rlhe walls of the kiln may be made of any suitable material, such as stone or brick, but preferably of stone and brick; and the inner surfaces of all parts of the kiln exposed to great heat are lined with fire-proof brick, and such linings are mainly represented in the drawings in the black shadings.

Non-conducting chambers 24, surrounding the furnace, are formed in the vertical Walls of the lower and middle sections, and these chambers are filled with sand or other suitable material, and serve to obstruct Vradiation and also to prevent bursting of the Walls.

In the use of my improved kiln the lime stone to be burned is first broken to a size that will prevent clogging or choking in its passage over the center core, 15, and is then passed through the door 23 in the upper section into the kiln. The fuel, if not previously placed, is then dropped through the induction-ports 6 onto the inclined re-grates, andis then burned in a manner to produce the greatest amount of gas, which passes through the liues as indicated by the arrows, and in its passage to the furnaceis ignited, and is supplied with the requisite amount of atmospheric air to insure complete combustion, to produce the greatest amount of heat in its passage through the stone in the furnace, which will be rapidly converted into lime, to be Withdrawn from the kiln through the draw holes.

rllhe Withdrawal of the lime permits the contents of the furnace to settle, to carry the burned stone or lime to the bottom of thekiln and the unburned stone to a position in the furnace where the heat produced by the combustion of the gases is most intense.

In this construction of kiln the lime, ashes, and cinders of the fuel are separated, by which a much purer article of limeis produced, and the labor of separating the ashes and cinders from the lime is avoided.

In the use of my improved kiln any of the ordinary fuels may be used; but fuels which will produce the greatest amount of gas-such as bituminous coals, peat, or gas-producing varieties of wood, either separately or combinedare preferred.

I claim as my invention- 1. In a limekiln, the combination of a furnace, a central core in the base of the furnace, combustion-chambers, an annular gas-flue, fines connecting the combustion -chambers and annular gas-flue, radial fiues to the furnace, and iiues connecting the annular iiue and radial dues, substantially as and for the purpose set forth.

2. The combination of the furnace, combustion-chambers, a system of tlues consisting of an annular flue, radial flues to the furnace, and fines connecting the annular fiue with the radial dues and with the combustion-chambers, and a series of radial airliucs to the furnace above the gas-fines, opening into the furnace, substantially as and for the purpose set forth.

3. The combination of a furnace, combustion-chambers, a system of gas-fines consisting of an annular gas-iiue, radial fiues to the furnace, and flues connecting the annular flue With the radial flues and With the combustionchambers, and draw-openings, substantially as and for the purpose set forth.

4. The combination of a furnace, combustion-chambers, a system of gas-dues, substantially as shown and described, between the combustion-chambers and furnace, and nonconducting chambers surrounding the furnace Within the furnace-Walls, substantially as and for the purpose set forth.

JOHN H. VALLSTROM.

lVitnesses:

A. W. BERGMAN, JACOB BEHEL.

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