US1635939A - Apparatus for reversing and controlling regenerative furnaces - Google Patents

Description

Jul 12 1927.

y e. H. ISLEY APPARATUS FOR REVERSING AND CONTROLLING REGENEHATIVE FURNACES Filed Feb. 15. 1923 2 Sheets-Sheet l eKJESLe llrar-nejl 152887222? fear all,

Jul 12 1927.

y G. H. ISLEY APPARATUS FOR REVERSING AND CONTROLLING REGENERATIVE FURNACES Filed Feb. 15, 1923 2 Sheets-Sheet 2 6 I 4 3 E W i I, .& /M/ 9 1 n l 1 Q a 7 r J a Z r \fl v m 5 95 H if U y fizz 2722 02: $2 0; 6% sLe Patented July 12, 1927.

UNITED, STATES PATENT OFFICE.

GEORGE E. ISLEY, OF WORCESTER, MASSACHUSETTS, ASSIGNOB TO IOBGAN COE- STBUCTION COMPANY, OE WORCESTER, MASSACHUSETTS, ACOBPOEATION OF HAS- SACHUSETTS.

APPARATUS FOR BEVEBSING AND CONTROLLING EEGENEBATIVE FURNACES.

Application fled February 15, 1923. Serial 110. 619,184.

The present'invention relates to the reversal and control of regenerative furnaces, with particular reference to the regenerative heating of the air used for supporting com- 6 bustion of the fuel employed, such asproducer gas, oil, coke oven gas, powdered coal, and the like. The invention utilizes, in part, the principles of operation which characterize the apparatus shown and described in my United States Letters Patent No. 1,464,002, dated August 7, 1923,all as more fully hereinafter described with reference to the accompanying drawings, wherein Fig. 1 is a diagrammatic plan view of the invention as applied to a conventional type of regenerative furnace.

Fig. 2 is a sectional view of the reversing apparatus shown in Fi 1.

Fig. 3 is an enlarged sectional view illustrating a detail of construction.

Fig. 4 is a sectional view illustrating a modification of the reversing apparatus.

Fig. 5 is an enlarged detail sectional view of 1parts shown in Fig. 4.

ig. 6 isa sectional view further modification of the reversing apparatus.

Like reference characters refer to like parts in the different figures.

As shown in Figs. 1 and 2, the invention is applicable, in general, to any type of regenerative furnace, irrespective of the fuel used therein. In connection with the use of oil, coke oven gas, tar, powdered coal, and the like, as fuel, involving the employment of suitable burners 1, 1' therefor at each end of the furnace, the invention is applicable to the regenerative heating of the air used to support combustion of such fuel, said air being admitted alternately to the furnace by way of suitable regenerator passages 2, 2'. In Fig. 1 the burner 1 is shown in operative position, and the burner 1 in inoperative position; as will be well understood, upon reversal' of the furnace, the burner 1 is moved into operative position and the burner 1 intoinoperative position.

As shown in Fig. 2, said air regenerator passages 2 and 2 are connected respectively to open ended ducts 3 and 3, each referably in the form, substantially, of a enturi tube, and equipped at or near its throat portion with a pan of oppositely directed enillustrating a training nozzles, designated 4 and 5, the former adapted to induce a gaseous flow through the associated duct 3 or 3 into the furnace, and the latter adapted to induce a gaseous flow in the opposite direction from the furnace. The several nozzles 4 and 5 are all preferably connected by suitable pipes or ducts 6, 6 to a common air chamber 7, the connection in each case being controlled by suitable valves or dampers, designated 8", 8 8 and 8, of the construction, for exam le, shown in Fig. 3. The chamber 7 is supp ied with air under pressure from a suitable blower 9, here shown as driven by a motor, or in any other suitable manner, and having an inlet control damper 10 to vary theair supply.

In connection with the passage of gases through the furnace from right to left, as shown in Fig. 1, (the left hand burner 1 being retracted or inoperative) the dampers 8 and 8 are left open and the dampers 8 and 8 are closed. .This results inthe operation of the ingoing nozzle 4 associated with right hand duct 3, and the outgoing nozzle 5 associated with left hand duct 3, the other nozzles being inoperative. As a consequence, air is drawn in through the upper open end of duct 3, and passes along with the air under pressure dischar ed by right hand nozzle 4 to the furnace, eing regeneratively heated on its way in the passage 2', while at the same time the burned gases pass from the other end of the furnace through the regenerator passage 2 under theinfluence of. the entraining action of the jet or jets of air under pressure discharged by the left hand nozzle 5. 4

The reversal of the furnace is effected by simply closin the two dampers 8 and 8 and opening t e two dam ers 8 and 8, and by causing the fuel supp y to be furnished by burner 1 instead of burner 1'. Under these conditions, the left hand nozzle 4 and the right hand nozzle 5 become operative, the other two nozzles being rendered inoperative. The supply of air to the furnace is that drawn in or entrained through the upper open end of duct 3, in conjunction with the air under pressure discharged by left hand nozzle 4, said air being heated by passage throu h the regenerator passage 2, while the pro ucts of' 'combustion drawn out through passage 2, by the entraining action of nozzle 5, are enabled to impart their heat to the walls of said assage preparatory to the subsequent intro uction of air through said passage at the next reversal of the furnace.

It is to be noted that the apparatus as above described afi'ords positive control both of ingoing and outgoing gases, owing to the fact that the draft in either case may be varied at will, by manipulation of any one or all of the dampers 8, 8", 8 and 8 and also the damper 10. This gives the apparatus the widest possible latitude and flexibility in meeting all of the various conditions of furnace o eration. For instance, under normal con itions of operation, a greater volume of ases must be handled on the outgoing side t an on the ingoing side, due to the increase in volume under high temperature; this is made possible by the independent control of the nozzles, which permits one to be 0 erated so as to entrain a larger volume 0 gases than the other. If it be desired to cool the regenerator passages for repairs or otherwise, this can be accomplished in one-half the time ordinarily required by operating both nozzles 4, 4, so as to blow cool air into both passages at the same time; the effect of this is tohold the heat in the furnace chamber, away from the regenerator passages, while repairs are being made. To cool the furnace proper for purposes of repair, both nozzles 5, 5 may be operated, to draw out all the gaseous products through the regenerator passages 2 and 2; the present invention permits of this cooling in much less time than that required when the usual types of reversing apparatus are employed.

In the apparatus shown in Figs. 4 and 5, the arrangement of the regenerator passages 2, 2' and associated open-ended ducts 3, 3' is the same as above described. The air under pressure is supplied by blower 9 to a supply chamber 7 as before, but in this instance there is but a single connection from said supply chamber to each duct 3 or 3, namely b way of pipes 11, 11. These pipes, provide with suitable dampers or va ves 12 and 12", each terminate, as shown in Fig. 5, in a thimble 13, the latter serving for the rotative support of nozzle elements 14, 14, in the respective ducts 3 and 3'. Said nozzle elements 14, 14 have spindles 15, 15 suitably journalled in the opposite walls of the ducts and provided exterlorly with operating handles 16, 16.

In connection with the passage of gases through the furnace from right to left, as indicated in Fig. 4, the right hand nozzle 14 is turned downwardly, so as to entrain air through the upper open end of duct 3 for passage, along with the air discharged by said nozzle, through the re enerator 2, while at the same time the urned gases from the other end of the furnace are drawn out through regenerator 2 by the entrainin action of left hand nozzle 14 which is turn upwardly for this purpose. The reversal of the furnace is efiected .by simply reversing the positions of the two nozzles 14, 14,

1. e., by turning up the right hand nozzle and turning down the left hand nozzle,- this being effected in conjunction, of course, with the reversal of the fuel supply. This arrangement of apparatus affords the same advantages and the same flexibility of furnace control as afforded by the arrangement of apparatus shown in Figs. 1, 2 and 3.

The reversal of the furnace shown in Fig. 4 can also be eii'ected by means of dam ers 3" and 3" provided in the ducts 3 an 3 respectively, these dampers being similar in construction to the dampers 8, 8 etc. When utilizing the duct dampers to obtain passage of the gases through the furnace from right to left, the right hand nozzle 14 is turned upwardly, asindicatedin dotted lines, in the same direction as the left hand nozzle 14, and theduct damper 3" isclosed. The blast from the right hand nozzle 14 is then deflected downwardly by the damper 3" through the regenerator assage 2, while at the same time the burn other end of the furnace are drawn out through the regenerator passage 2 by the action of the left hand nozzle .14.- The reversal of the furnace may then be effected by simply opening the damper 3" and closing the damper 3", whereupon the blast from the left hand nozzle 14 is deflected downwardly by the damper 3" into the regenerator passage 2, while the burned are drawn out through the regenerator passage 2 b the right hand nozzle 14.

O viously, the furnace shown in Fig. 2 can also be controlled and reversed by employing the duct dampers 3 and 3" in connection with onl the upwardly extending nozzles 5, 5. With both of the dampers 8" and 8 open, and with the dampers 8 and 8' closed to prevent discharge throu h the nozzles 4, 4, the passage of gases t rough the furnace can be controlled by'mani ulating the duct dampers 3 and 3' just as escribe with reference to Fig. 4.

In a third form of the invention, shown in Fig. 6, the opposite air regenerators 17 and 17 of the furnace terminate respectively in upwardly directed extensions 18 and 18 the latter mer ing into a common horizontal chamber 19, fiaving a single air inlet 20, and a single dischar e duct 21. Nozzles 22 and 23 are respective y dis osed in said inlet- 20 and in said discharge uct 21, these nozzles being supplied with air under pressure from a blower 9 by pipe connections 24, 24, equipped with the usual control valves or dampers 25, 25. A swinging butterfly valve 26 is disposed in the chamber 19 and, in the gases from the accuse full line position thereof, allows the passage of gases through the furnace from right to left, as shown y the arrows in Fig. ,6, the nozzle 22 operating to entrain the air through inlet 20 to force it along with the air discharged by said nozzle, into the right hand end of the furnace through regenerator passage 17, and the nozzle 23 serving to entrain the waste gases from re erator passage 17, and to cause their ischarge through the upper open end of discharge duct 21. The reversal of the furnace is effected by shifting the butterfly valve 26 into the dotted line position, thereby causing the entering air, entrained b nozzle 22, to pass into re enerator 17, an the waste gases, entraine by nozzle 23 to be .discharged from re enerator 17' through the duct 21. It is to e noted in this connection that one side of the butterfly valve 26 is always exposed to the cool entering air; the other side, which is exposed to the hot gases discharged from the furnace, may be suib ably protected b the use of a heat resistin surface of fire rick, or the like, as indicated at 27.

I claim, 1. Apparatus of the class described, comprising an outwardly opening duct leading rom each end of a regenerative furnace, an air supply means having branches opening into both of said ducts and means selectively operable on said air supply means and its branches for discharging air into each of said ducts in an inwardly directed or. in an outwardly directed jet, the first named jet of air with the air entrained by it constituting the air supply throu h one of said ducts for the sup ort of com ustion within the furnace, an the last named jet of air serving for the entrainment in the other of said ducts of the waste gases from the furnace lfior discharge through the open end, of said not. 2. Apparatus of the class described, comprising an outwardly opening duct leading rom each end of a regenerative furnace, an air nozzle in each of said ducts, and means for supplying air to said nozzles for. the creation m one of said ducts of an inwardly directed air-entraining jet of air, and in the other of said ducts of an outwardly directed air jet for entraining and discharging waste gases from said furnace.

3. Apparatus of the class described, comprising an outwardly opening duct leading rom each end of a regenerative furnace, an air nozzle for the delivery of air under pressure in each of said ducts, means for supplying air to each-*of said nozzles, and means for selectively procuring, in each duct, a jet discharge of air from said nozzles in an mward or an outward direction, said inward jet, with the air entrained by it, constituting theair supply for the support of combustion in the furnace, and said outward jet serving for the entrainment of the waste furnace gases and their discharge to the atmosphere.

GEORGE H. ISLEY.

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