US1282649A - Regenerative furnace. - Google Patents

Description

A. L. STEVENS. REGENERATIVE FURNACE. APPLICATION FILED SEN-25.1916.

Patented Oct. 22, 1918.

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ATTORNEYS A. L. STEVENS.

REGENERATIVE FURNACE.

APPLICATION FILED SEN-25. 191s.

Patented Oct. 22, 1918.

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A. L. STEVENS.

REGENERATIVE FURNACE. APPLICAHON FILED SEN-25,1916.

Patented Oct. 22, 1918.

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ATTORNEYS A. L. STEVENS. REGENERATIVE FURNACE. APPLICAIIQN FILED SEPT-25, 191s.

Patented .Oct. 22, 1918.

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Patented 00t.22,1918.

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A. L. STEVENS. REGENERATIVE FURNACE. APPLICAHON nuzu SEN-25.1916.

Patented Oct. 22, 1918,

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INVENTOR ,4 TTOR/VEVS A. L. STEVENS.

REGENERATIVE FURNACE.

APPLICATION FILED SEPL25, 1916. 1,282,649. Patented Oct. 22, 1918.

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INVENTOR f xx lf Y i aluo 4 ATTORNEYS ARTHUR L. STEVENS, OF CHICAGO, ILLINOIS.

REGENERATIVE FURNACE.

Specification of Letters Patent.

Patented Oct. 22, 1918.

Application filed September 25, 1916. Serial No. 122,110.

To all whom it may concern:

Be it known that I, AR HUR L. STEVENS,

a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Regenerative Furnaces, of which the following is a specification.

My invention relates to the construction of furnaces, more particularly furnaces of the regenerative type, and one of the objects of the invention is to provide certain novel and improved apparatus, inexpensive in its construction and conveniently operated, for controlling the fuel and air supply to the combustion chamber and regenerators, and the outflow of products of combustion from the latter by means of which the flow of gases through the furnace may be periodically reversed, in such manner as to minimize waste of fuel.

A further object is to provide certain improvementsin the construction of the gas and air valves with a view of economical construction and durability.

A further object is to provide im roved means for water cooling the doors of t efurnace.

The invention consists in the new and improved arrangements, constructions and de vices to be hereinafter described and claimed, for carrying out the above stated objects and such other incidental objects as will appear from the following description.

The invention is illustrated as embodied in a furnace of preferred construction, in the accompanying drawings wherein- Figure 1 is a front elevation of the furnace.

Fig. 2 is an elevation, with parts in sec tion, of the back of the furnace.

Fig. S'is a sectional view, on line 3- 3 of Fig. 1.

Fig. 4 is a partial end elevation of the furnace viewing the same from the right hand end as shown in Fig. 1.

Fig. 5 is a longitudinal sectional view taken on line 55 of Fig. 3.

Fig. 6 is a fragmentary view, in perspective, illustrating the reversing valves and their controlling mechanism.

' Fig. 7 is a fragmentary plan view on line 7-7 of Fig. 2. p

Fig. 8 is a fragmentary'longiti-ldinal section taken through one of the gas valves and assoclated mechanisms.

Fig. 9 is a sectional viewon of Fig. 8.

Fig. 10 shows the same parts but in re versed position.

Fig. 11 is a cross sectional view on line 1111' of Fig. 8.

Fig. 12 is a longitudinal section taken through the air valves and their valve cas- Figs. 13 and 14 are sectional views on lines 1313 and 14-14, respectively, of Fig. 12, and

Fig. 15 is a detail view of the driving connection between the operating shaft and the air valve shaft.

Like characters of reference designate like parts in the several figures of the drawings.

Referring to the drawings, 25 designates the combustion chamber of the furnace, and

26, 26 the regenerators arranged at opposite sides of the combustion chamber and communicating herewith by fiues 27, 27 The furnace shown in the drawings is intended to employ gas as a fuel. 28 is the gas supply pipe provided with branches 29. 29 which supply fuel to the burners 30, 30 on opposite sides of the furnace through reversing valves, the construction of which will be referred to presently. The burners communicate with the combustion chamber by means of ducts 31, 31 which open; into the combustion chamber at the places where flues 27, 27 communicate therewith.

Air under pressure is supplied to the combustion chamber through the regenerators from air supply pipe 32, branch pipes '33, 33, headers 34, 34", and nozzles 3.5, 35* which latter extend through the side walls 36, 36 into the spaces 37, 37 under the checkerwork of the regenerators. Reversing valves, to be hereinafter described, are arranged between air supply pipe 32 and the branchpipes 33, 33.

The products of combustion are discharged from the regenerators through Hues 38, 38 adaptedto be closed by slide valves 39, 39, these flues leading to a common discharge flue 40 communicating with the stack he course of the gases throughthe furnace will be apparent from inspection of Fig. 5. This figure shows the furnace being i h zll fired from the left hand side. The gas is introduced into the combustion chamber from burners through ducts 31 and air is introduced into regenerator 26 from branch pipe 33, and after being heated by passing through the checkerwork of the regenerator, is mixed with the gas at the place that the two fluids enter the combustion chamber. The products of combustion. flow out through flue 27 regenerator 26 flue 38*, valve 39 being raised, flue 40 and stack draft fiue 41.

By reversing the fuel, air and discharge valves the drafts through the furnace are reversed. The reversible valve apparatus will now be described.

The reversing calves for the fueZ.-There are two gas valves, one in branch pipe 29 and the other in branch pipe 29 These valves are alike in construction so that it will suffice if the left hand valve (Figs. 2, 6 and 8) be described in detail. In the drawing the corresponding parts of the other valve are connected by corresponding reference numerals. The valve casin connected with pipe 29 is made up prefera 1y of two flanged, tapered, commercial pipe sections 42, 43 suitably clamped together, between which is arranged an apertured'diaphragm 44. The valve 45 is of the revoluble damper type-and is mounted upon one section 46 of a telescopic shaft, the other sections being indi--' cated by 47, 48. The diaphragm plate has a boss 49 to provide a bearing for the shaft section 46, and the latter is provided with a collar 50 between which and the boss is interposed a coiled spring 51 which serves to keep the valve, hub 52 of which is pinned to shaft 46, pressed against the diaphragm plate. The shaft section 46 extends through a T pipe section 53 to which is secured a pipe 54 which connects with the pipe 55 in which the burners 30 are set. The shaft 46 has its outer end squared, as indicated at 56, a d the squared end of the shaft enters a similarly shaped socket in the connecting member 57 pinned to the shaft section 47,

the latter being similarly connected withshaft section 48 which is revolubly mounted in bearings formed on a bracket member 58 which is secured to the back wall of the furnace. 59 is an operating shaft, preferably of the same telescopic construction as the gas valve shaft just .described. .This shaft is mounted in bearings in bracket 58 and a similar bracket 58 at the other end of the furnace, and is provided with ahand wheel 60. Keyed toshaft 48 is the rocking member 61 of a mechanical movement similar to a Geneva movement, the revoluble member 62 of which is fast to shaft 59. The rocking member is formed with two arcuate surfaces 63 separated by a slot 64, the arcuate surfaces having the same radius as the revoluble member 62 which is cut away at 65 to allow nasaeae the slotted projecting portion of the rocking member to passthe revoluble member. The revoluble member carries a crank 66 pro vided with a pin 67 which enters the slot 64 of the rocking member. 68 is a stop on shaft 59 which, by engagement with a fixed stop member 68 limits the rotational movement of the shaft to approximately 300 degrees.

Fig. 9 illustrates the position of the parts of the Geneva movement when valve 45 is open. Vhen the hand wheel is turned in the direction indicated by the arrows in Figs. 6 and 9, pin 67 of the revoluble member of the Geneva movement enters slot 64 of the rocking member and rocks the latter and turns shaft 48, 47, 46 sutliciently to close valve 45. It will be understood that valve 45 is closed at this time. The parts of the Geneva movement which operate the shaft to which valve 45 is fixed (the right-hand end of Fig. 6) are so positioned that the revoluble member 62 will make a partial revolution after valve 45 has been closed before its pin 67 enters the slot 64 in the rocking member 61 When this occurs the further turning of the operating shaft 59 opens gas valve 45. An appreciable interval of time intervenes, however, between the closing of valve 45 and the opening of valve 45. During this interval the draft through the furnace is reversed, as will be next described. If the reversal of the draft took place while either set of gas burners was open, a certain amount of gas would be wasted. By the arrangement above described this waste is prevented.

Air valves, (Figs. 6 and 12 to 15, inclusive.)The valve casing for the air valves consists preferably of a T pipe section 69 communicating with air supply pipe 32 and conical pipe sections 70, 70*, to the former ofwhich is connected the branch air pipe 33 and to the latter is secured a T pipe section 71 to which branch pipe 33* is connected. Between pipe sections 69 and 70, 7 0 respectively, are clamped apertured diaphragms 72, 72 against the inner sides of which bear valves 73, 73 74 is a shaft upon which valve 73 is splined and to which valve 73 is pinned. This shaft is mounted in bearings 75 formed on the diaphragm plates and in a bearing 7 6 formed on the'end cap 77 of the T section 71. 7 8 is a collar pinned to shaft 74 and formed with a spring seat 79 for a coil spring 80 which bears against the hub 81 of valve 73, thereby keeping both valves pressed closely against their respective diaphragm plates. On the end of shaft 74 is a sector gear 82 which mesheswith a pinion 83 on the operating shaft 59. As shown in Figs. 12, 13' and 14, the air valve 73 is open and air valve 7 3 closed. The air, therefore,

enters the furnace through regenerator 26 and flue 27 as shown by the arrows in Figs. 2 and 5. When the operating shaft is re fineness volved ta the gas valves the position of the air valves is also reversed so that the air is shut ofi from regenerator 26 and admitted to regenerator 26*, causing a reversal of the draft through the furnace. The air valves are moved simultaneously, one beginning to open and the other beginning to close as soon as the operating shaft 59 is revolved. The reversal of the air, therefore, is practically complete before gas valve has begun to open, effecting the economy in fuel above noted.

The valves 39, 39 controlling the discharge of products of combustion from the regenerators are also preferably operated from shaft 59 which is provided with drums 84, 84?, upon which are Wound the cables 85, 85 attached, respectively, to valves 39, 39 'With the furnace firing from the left hand side, as shown in the drawings, valve 39 will be closed and valve 39 opened. The position of the valves is reversed when the shaft 59 is turned-to reverse the gas and air valves.

D00rs.-The front wall 86 of the furnace is formed with a plurality of door openings 87 which are closed by doors 88 each of which is supported by a cable 89 attached to a sector 90 pivoted at 91 to a bar 92 extending across the front of the furnace. The

sector has a rigid arm 93 connected by a.

cable 94 with one arm 95 of a bell crank pivotally mounted on a bracket 96, the other arm 97 of which is considerably longer than arm 95 and has connected thereto by cable 98 a counterweight 99. The doorin closed position rests upon a casting 100 on the front of the furnace.

Each door is formed with a water space 101 intowhich' projects,

slidably, a water feed pipe 102 connected with a water supply chamber 103 on the front of the furnace which is kept constantly supplied with water through pipe 104. The doors are provided with water outlet pipes 105 which extend, slidably, into vertically disposed branch pipes 106 connected with a discharge pipe 107 on the front of the furnace which runs to any suitable drain. It will be observed that the water pipes, by means of which circulation is maintained through the water spaces of the doors, serve also to guide the doors when they are raised and lowered.

While I have described my invention in certain preferred embodiments, it will be understood that changes in the design and arrangement of the parts might be made without departure from the principles of the invention. Therefore I do not wish to be understood as limiting the invention to the precise constructions, arrangements and devices shown anddescribed except so far as the claims are specifically so limited.

I have referred to the burners 30 and 30 as constituting two sets of burners, as ordinarily there will be more than one burner on each side of the furnace. i do not wish to imply, however, that it is necessary in carrying out my invention to have a plurality of separate burners in each so-called set.

ll claim:

1. YA valve reversing system for regenerative furnaces comprising fuel valves for controlling the fuel supply to alternately utilized sets of burners, and mechanism for operating said valves consisting of a shaft and Geneva movements associated with said shaft and with the valves, respectivel ,timed so as to shift said valves one a er the other. r

2. A valve reversing system for re enerative furnaces comprising fuel valves or controlling the fuel supply to alternately utilized sets of burners, and mechanism for operating said valves consisting of a shaft and Geneva movements associated with said shaft and with the valves, respectively, timed so that the closed valve is not opened until an appreciable period of time after the open valve is closed.

3. A valve reversing system for a regenerative furnace having regenerators, a combustion chamber communicating with said regenerators, and a fuel supply pipe having branches entering the combustion chamber at difierent points comprising valve casings associated with said branch'pipes provided with apertured diaphragms, revoluble damper valves which bear against said plates and close said apertures, telescopic shafts to which said valves are fixed, an operating shaft, and driving connections between said operating shaft and the shafts to which the valves are fixed.

4:. A valve reversing system for a regenerative furnace having regenerators, a combustion chamber communicating with. said regenerators, and a fuel supply pipe having branches leading to the combustion chamber comprising valve casings associated with said branch pipes provided with apertured diaphragms, revoluble damper valves which bear against said plates and close said apertures. telescopic shafts to which said valves are fixed, an operating shaft, and drivin connections between said operating she and the shafts to which the valves are fixed disposed so that an appreciable period of time elapses after the open valve has been closed before the closed valve is opened.

5. A valve reversing system for a regeneratiye furnace havingregenerators, a combustion chamber communicating with said regenerators, and a fuel supply'pipe having branches leading to the 'combustion chamber comprising valve casings associated with said branch pipes provided with apertured diaphragms, revoluble damper valves which be 1' against said plates and close said apertu es, telescopic shafts to which said valves are fixed, an operating shaft, and Geneva ion movements associated with said shaft and with said valves, respectively, timed so that an appreciable interval of time elapses after the open valve is closed before the closed valve is opened.

6. In a regenerative furnace, the combination with the regenerators, a combustion chamber communicating with said regenerators, two sets of alternately utilized fuel burners to supply fuel to the combustion chamber, a fuel supply pipe and air pipes leading to said regenerators, respectively; of reversing valve apparatus comprising fuel valves for controlling the fuel supply to the burners, valves for controlling the supply of air to the regenerators, and mechanism for operating said valves whereby the flow of fuel is shut off from the furnace while the draft through the combustion chamber is being reversed.

7. In a regenerative furnace, the combination with the r'egenerators, a combustion chamber communicating with said regenerators, two sets of alternately utilized fuel burners located to supply fuel to the combustion chamber, a fuel supply pipe and air pipes leading to said regenerators, respectively; of reversing valve apparatus comprising fuel valves for controlling the fuel supply to the burners, valves for controlling the supply of air to the regenerators, and mechanism for operating said valves whereby the initial movement of such mechanism closes the open fuel valve, the continued movement thereof closes one air valve and opens the other, and the completion of said movement opens the other fuel valve.

8. In a regenerative furnace, the combination with the regenerators, a combustion chamber communicating with said regenerators, two sets of alternately utilized fuel burners located to supply fuel to the combustiou'chamber, a fuel supply pipe, and aiil pipes leading to said regenerators, respectively; of reversing valve apparatus comprising fuel valves for controlling the supply of fuel to the burners, air valves for controlling the flow of air to the regenerators, and mechanism for moving said valves which operates continuously on the air valves to open one and close the other but intermittently on the fuel valves so that an appreciable period of time elapses after the open fuel valve is closed before the pther fuel valve is opened.

9."In a regenerative furnace, the combination with the regenerators, a combustion chamber communicating with said regenerators, two sets of alternately utilized fuel burners, a fuel supply pipe, and air pipes leading to said regenerators, respectively; of reversing valve apparatus comprising fuel valves for controlling the supply of fuel to the burners, air valves for controlling the air to the regenerators, respectively, an

leading let ports, a

operating shaft, driving connections between the operating shaft and the air valves whereby one valve is opened and the other closed simultaneously, and driving connections between the operating shaft and the fuel valves timed so that an is closed before the'closed valve is opened.

10. In a. regenerative furnace, the combination with the regenerators, a combustion chamber communicating with said regenerators, two sets of alternately utilized fuel burners to supply fuel to the combustion chamber, a fuel supply pipe, and air pipes to said regenerators, respectively, of reversely valve apparatus comprising fuel valves for controlling the supply of fuel to the burners, air valves for controlling the air to the regenerators, respectively, an operating shaft, driving connections between the operating shaft. and the air valves whereby one valve is opened and the other closed simultaneously, and Geneva movements associated with said op erating shaft and with the fuel valve respectively, timed so that the closed valve is not opened until after the open valve is closed.

11. In a regenerative furnace, the combination with the regenerators, a combustion chamber communicating with said regenerators, a fuel supply pipe having branches leading to the combustion chamber, an air supply pipe having branches leading to the regenerators respectively; of reversing va lye apparatus comprising fuel and air. valves to control the flow of fuel and airthrough said branch pipes respectively, and mechanism, for operates toreverse the draft through the furnace while the gas is shut off therefrom.

12. In a regenerative furnace, the combination with the 'regenerators having outcombustion chamber communicating with said .regenerators, two

appreciable period of time elapses after the open'valve shifting said valves which sets of alternately utilized fuel burners to supply fuel to the combustion chamber, a fuel supply pipe, and air pipes leading to said regenerators respectively; of reversing valve apparatus comprising fuel valves for controlling the fuel supply to the burners, valves for controlling the supply of air to the regenerators, valves for opening and closing said outlet ports, and mechanism for operating said valves whereby the flow of fuel is shut off from the furnace while the draft through the combustion chamber is being reversed.

13. In a regenerative furnace, the combination with the regenerators formed with outlet ports, a combustion chamber communicating with said regenerators, a fuel supply pipe having branches leading to the combustion chamber, an air supply pipe having branches leading to the regenerators respecii sly mesh Whisk @3333 21 Iurmcs 9.51 the sombus a furnace selynrising reveair Yalves, hcah l movabie 00mm parts an ops/mt i-011s between csmbinatien with "12 valves, an spam c pvsmsms Fran sald valves aims-c1 s0 said valves is clsssd after all clabls ntsr'm the other valve is mansfi.

36c ins combination 9. a

:mrnase having ssparst-e fuel 2111 air supsims leading; the regam;

erefor, 01-

i'cr "5sair ihrmagh f1 1 valves 23s close a Hive g ens1 21.30 rs. embust-wn 1'; sass 0; aitsmabeiy utilize parts entering; the combusztlon chamber mats s .1 i at 'clmeisnis palms, um. supply ipes leadsaid ports air p5. as leading said Tsgsnerbtors, valves for eontl Qihnp; the fuel fuel wives are dsssvlo 18. In combination, a regenerative furnace hzwmg regsnsmtors, a combustion chamber, two seis of alternately utilized fuel ports entering the combustion chamber difi'ersnt points, ills supply pipes leading to said ports, air pipes Keading to said regensmtm s, valves 1E0 csntmliing sh-s fuel and air sup cdy and mechanism for missing iwbh the 5511s vsivss duymg z'eversai 01' the L, STEVENS"

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