US469820A - Regenerative hot-blast stove - Google Patents

Description

(No Model.) 2 Sheets-Sheet I.

G. W. MGG'LURE 8; O. AMSLER. REGENERATIVE HOTBLAST STOVE.

No. 469,820. 7 Patented Mar. 1,1892.

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GEORGE MOOLURE AND CARL AMSLER, OF PITTSBURG, PENNSYLVANIA.

REG EN ERATIVE HOT-BLAST STOVE.

SPECIFICATION forming part of Letters Patent No. 469,820, dated March 1, 1892.

Application filed June 5, 1891. Serial No. 395,246. (No model.)

' To all whom it may concern.-

Be it known that we, GEORGE W. MOOLURE and CARL AMSLER, both of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Regenerative Hot-Blast Stoves, of which the following is a full, clear, and exact description, reference being had to the achorizontal sectional view in four difierent sec' tion planesviz., on the planes shown by the lines A A, B B, C C, andD D,respectively. v

The object of ourinvention is to provide a stove having at the top a connection between the vertical fiues and the stack-flue, so constructed that there shall not be that liability to fracture of the'walls by expansion and contraction which has been present in stoves constructed as heretofore. This we effect by constituting the connecting-passage by means of a dome-shell or arch made separate from the crown of the stove and affording an intervening space instead of forming fines in the crown itself.

Our invention also relates to other features of construction of the stove.

Referring now to the drawings, 2 represents the outer cylindrical wall of the stove incased in a suitable jacket. The stove, as shown, is divided into a series of concentric annular fines, though it should be understood that our invention, broadly stated, is not limited to the arrangement of such fiues, since the construction of the top of the stove is claimed by us independently. We intend also to claim these features in combination.

3 is the central flue of the stove, the base of which serves as the combustion-chamber, while the upper part terminates below the stove-crown 4and communicates with an annular fine 5, formed by an outer cylindrical wall 6, which extends from the crown to the stoves base.

7 is an outer flue constituted by the annular space intervening between the walls 6 and 2. The flue 5 is divided into a number of parts by radial partition-walls 8, which serve to increase the heating-surface of the stove, and the flue 7 is also divided by an annular wall 9 and cross-partitions 10. The fines 5 and 7 are connected by ports 11 at the lower part of the stove. These ports 11 enter the middle of the fines, and in addition thereto there are other connecting-ports 11 at the sides of the ports 11, which insure even flow of the gas to all parts of the fiue and prevent unequal distribution of the gas. All the radial walls in the outer fine 7 terminate said fine.

12 is a gas-inlct port opening into the base of the flue 3.

13 is a gas-burner pipe adapted to discharge gas thereinto, and 1a is an air inlet port through which air is admitted to support combustion of the gas.

15 is the hot-blast main provided with a suitable valve 16 and leading from the base of the flue 3. This main is also provided with an air-port 17 for the inlet of air to assist in combustion of the gas.

18 is a dome or arch which surmounts the outer wall 2 and is separate from the crown of the stove, so as to afford an intermediate fine or passage 22, connecting all the divisions of the outer flue 7 with a central stackfiue 19 for the exit of the products of cornbustion.

20 isa valve for closing the stack-fiue,'and

21 is the cold-blast-inlet pipe, which discharges into the stack-fine below said valve and is itself provided with a suitable controlling-valve by which the admission of air may be regulated.

21 21 are holes through which may be drawn chains attached to suitable brushes or scrapers in the fines.

The operation of the stove is as follows: To heat the fines the stack-flue valve 20 is opened, the valve of the hot-blast main is closed, and combustible gas is introduced into the gasinlet 12.- The gas, uniting with air admitted through the air-inlets, burns in the flue 3, ascends through this fiue to the crown of the stove, then descends through the several divisions of the annular fiue 5, and at the base thereof passes through the ports 11 and 11 into the outer flue 7 and ascends through the divisions of this fine, and finally passes through the flue 22 to the stack. When the fines have been heated in this manner to a sufficiently high degree, as in ordinary hotblast stove practice, the gas and air inlets into the base of the fine 3 are closed, the stackvalve is also closed, and the valves of the cold-blast pipe and hot-blast main are opened. I

The air then enters through the cold-blast main, descends through the flue 22, and passes in succession (and in reverse direction to the above-described course of the gases of combustion) through the dues 7, 5, and 3, in which it is heated by the stored heat of the walls, and finally passes off through the hot-blast main to the furnace, at which it is utilized. When the stove has cooled to such extent that the air is no longer efficiently heated, it is again heated by reversal of the valves in the usual way.

It will be noticed from the foregoing description that the arch 18, being not tied to the-inner crown of the stove, is quite free to move vertically with the outer walls in the expansion and contraction caused by variations in temperature of the stove. way we overcome what has been a fruitful structure. from having the flue 22 continuous, or practically so, instead of employing a series of small individual fines traversing the furnacecrown, is that we secure an even draft from all the divisions of the upright fines and thus passages leading into the inner shell, and

valved passages leading from the space be- In this tween the roof and crown, substantially as and for the purposes described.

. 2. A hot-blast stove comprising an outer roofed shell, an inner concentric shell with a crown separated from the outer roof and having apertures in its sides, an open-topped shell within the inner crowned shell, valved passages leading into the innermost shell, and valved passages leading from the space between the roof and crown, substantially as and for the purposes described.

3. A hot-blast stove comprising an outer roofed shell, an inner shell having a crown, a series of apertures in the lower part of the inner shell, a higher series of apertures alternating therewith, valved passages leading into the inner shell, and valved passages leading from the space bctweenthe roofand crown, substantially as and for the purposes described.

4. A hot-blast stove comprising an outer roofed shell, an inner aperturcd shell having a crown separated from the outer roof, partitions in the flue between the shells and terminating above the apertures, valved passages leading into the inner shell, and valved passages leading from the space between the roof and'crown, substantially as and for the purposes described.

5. A hot-blast stove comprising an outer roofed shell, a valved stackaflue leading therefrom,-an inner concentric shell having aseparate crown, apertures inthe wall of the inner shell, a combustion-chamber within the inner shell, a hot-blast o'utlet an inlet for fuel loading thereto, and a cold blast outlet terminating in the space between the crown and roof, substantially as and for the purposes de scribed.

In testimony whereof we have hereunto set our hands this 29th day of May, A. D. 1891.

GEORGE W. MGCLURE. CARL AMSLER. Witnesses:

H. M. CORWIN, THOMAS W. BAKEWELL.

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