US1170301A - Valve mechanism for regenerative furnaces. - Google Patents

Description

L. N. MCDONALD.

VALVE MECHANISM Eon REGENERATIVE FURNACES.

APPLICATION FILED JULYIZ. 1915. V v 1,170,301, I Patented Feb. 1, 1916.

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WITNESSES: INVENTOR- y I I f I I V E v I ATTORNEY THE COLUMBIA PLANOGRAPH co WASHINGTON, D. c. I

L. N. McDONALD.

VALVE MECHANISM FOR REGENERATIVE FURNACES.

APPLICATION FILED JULY 12. I915.

1,170,301. l Patented Feb. 1, 1916.

2 SHEETS-SHEET 2.

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THE OLUMBIA PLANOGRAPH cm, WASHINGTON. D. c. v

LOUIS N. MoDONALD,-OF YOUNGSTOWN, OHIO.

VALVE MECHANISM FORREGENERATIVE FURNACES.

Specification of Letters Patent.

Application filed July 12, 1915. Serial No. 39,295.

To all whom it may concern Be it known that 1, Louis N. MCDONALD,

a citizen of the United States, resident of Youngstown, in the county of 'Mahoning and State of Ohio, have invented certain new and useful Improvements in Valve; Mechanism for Regenerative Furnaces, of which the following is a specification.

The primary object of the present invention is to provide an improved arrangement of valve mechanism for regenerative furnaces for preventing the discharge of gas from the gas flue when the furnace is being reversed, and may be embodied in apparatus of the general character disclosed in Patent No. 987,73, granted to me March 28, 1911. In the arrangement shown in that patent provision is had for closing the stack flue when the reversing valve is raised or opened for reversing its position. Vhile the location of the shut-off valve shown in that patent possesses marked advantages,

there are certain other advantages which result from placing a similarly operating valve in the unburned gas or fuel supply flue. With the gas flow uninterrupted, considerable gas passes into the chamber during the reversing operation which escapes unconsumed to the stack as soon as the valve has been completely reversed. With the gas flow shut off during the reversing operation this waste is prevented. Also, with the gas flow stopped while the reversing valve is being adjusted, the resulting head or accumulation of pressure in the gas flue has the effect of more rapidly filling the checker chamber when the gas is released, thereby more quickly establishing normal conditions within the chamber after each reversing operation.

In the accompanying drawings, Figure 1 is a sectional elevation showing a reversing valve of the Dyblie type applied to the flues of a regenerative furnace. Fig. 2 is a sectional plan on line 2-2 of Fig. 1, showing the arrangement and relative location of the several flues of a regenerative furnace.

Referring to the drawings, 2 designates a main gas flue leading from the gas producer or other source of gas supply, and 3 is the flue connection leading from a reversing valve 1 to a stack flue 5. A flue connection 6 is provided leading from the stack flue which connects to the air valves of the regenerative furnace. The reversing valve 1 is employed to connect the gas regenerator flues 7 and 8 with the gas flue 2 and inlet 3 leading to stack flue 5. Flues 9 and 10 which lead, respectively, to the air regenerators located at opposite ends of regenerative furnaces are provided with connecting flues 11 and 12 which are arranged in a suitable location relative to the air inlet 6 leading into the stack flue. A valve, usually of the Siemens butterfly type, is employed to connect the flues 9 and 10 from the air regenerators with the inlet 6 leading to stack flue 5. i

As illustrated in my former patent, a shutter or damper valve 13 is located in the stack-connecting flue 3, the valve being mounted in suitable recesses or grooves in the opposite side walls of the flue so asto be slidalole in a vertical direction for opening and closing or shutting off the flue connection 3 from the flue 5.

The rotary reversing valve 1' of the Dyblie type is here shown employed to connect the gas and stack flues with'the gas regenerator 'flues. A suitable turning mechanism is provided in which the first movementin the reversing operation is to lift the casing of the valve vertically in order to raise the bottom marginal edge 4* of the partition in the valve above the upper marginal edge of the water seal 14, the latter being supported by.

the masonry in which the vertically extending flue outlets are formed.

As here shown, a stemor rod 15 connects the casing of valve 4 with'a chain or other flexible suspending means 16 secured to a lever 17 the latter being pivoted intermediate its ends to any suitable overhead'support such as bracket 19 depending from a floor 20, the latter usually covering the valve pit commonly employed in connection with regenerative furnaces. The side of lever 17 to which'the reversing valve is connected has its extremity counterweighted at 23, and also flexibly connected to that side of the lever is one end of the lever 17 the latter suitably supported by bracket 19 depending from floor 20. Suspended from the free end of lever 17', as by chain 21 and rod 22, is valve 13.

Similarly suspended from the free end of lever 17 by chain 21' and rod 22 is valve 13 for the live gas flue 2. Valve 13 may be of the same construction and mounted for vertical movement for closing and opening flue Patented-Feel, 1916.

2 in the same manner as valve 13 for the outlet flue. I

From the foregoing it will be seen that valves 13 and 13 close their respective flues simultaneously with the raising and opening of reversing valve 4, and after the latter has been turned as required for properly directing the live and burned gases it is lowered and simultaneously therewith valves 13 and 13 are raised, thereby restoring the several valves to position for maintaining normal working conditions.

l/Vith the Dyblie valve 4; raised and opened as in Fig. 1, its position when being rotated for the reversing operation, valve 13 is closed and the flow of fresh gas from fiue 2 is stopped. After valve 4; has been turned sufliciently to reverse its position, and thereby reverse the connection between the gas flue 2 and regenerator flues 7 and 8, all as described in my former patent, it is lowered, and by the same movement valves 13 and 13 are raised and opened, thereby admitting fresh gas into the new path established by the reversing valve and opening the new path established by said valveto the stack. The coursing of the gases and products through the several flues is described in my former patent, and need not be here repeated.

\Vith the flow of fresh gas shut off by valve 13 during the reversing operation, there is no waste of fuel such as might otherwise ensue, for in the absence of such valve a considerable volume of gas might accumulate in the checker work that would pass unconsumed to the stack upon opening valve 18. WVithboth the gas inlet flue and the stack flue closed, the gas remaining in the checker chamber will flow into the furnace during the reversing of valve 41 and no waste will result, there being no opportunity of short circuiting to the stack, the stack draft being effective through the checker chamber for thus drawing the gas into the furnace, thereby completely emptying the chamber and consuming and obtaining the benefit of the last portion of the gas flow which otherwise would be wasted.

A further advantage of gas flue valve 13 results from the accumulated head or pressure of gas behind said valve which when the latter is opened immediately fills the checker chamber with which it is in communication, thereby quickly restoring the gas flow and gas consumption to normal conditions.

I claim:

In a regenerative furnace, valve mechanism comprising a reversing valve adapted to operatively connect the stack and gas fines with the regenerator flues, a valve for the gas flue, a valve for the stack flue, and means operatively connecting all of said valves and constructed and arranged to close the gas flue valve and the stack flue valve while the reversing valve is being operated to reverse the direction of flow of gases.

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

LOUIS N. MCDONALD.

Witnesses WARREN F. PERRY, XW'ILLIAM C. DAMMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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