Bar and sheet heating furnace

Abstract

Claims

March 10, 1925- 1,529,617 G. J. HAGAN BAR AND s HEET HEATING FURNACE lfllll 2 7% Z FIG. 2. v March 10, 1925- 1,529,617 G. J. HAGAN BAR AND SHEET HEATING FURNACE Filed April 1'7, 1925 3 Sheets-Sheet 2 1 {L f g I Q a win 14 /I z 1 1+ v 2 1% Z I H 11 :1 INVEN OR ATTORNEY rum: March 10, 1925- 1,529,617 a. J. HAGAN' BAR AND swam HEATING Fumucz: Filed April 1'7, 1923 5 Sheets-Shea} 5 E FIG. 5 m 2* INVENTOR ATTORNEY Patented Mar. 10, 1.925, - UNITED m smmsome; enonen a. HAG-AN, 0F PERRYsVILLE, rENNsYtvANIAjAssrGNoa ToeEo'ReE J4 HAGAN COMPANY, OF PITTSBURGH, PENNSYLVANIA,'A CORPORATION or ram 9 SYLVANIA. I ' HEAR Ann SHEET HnnTrNerUnNAcEQ A lication filed. Apri1 17,- 1923} Serial No. 632352] plane thei-. line To all whom it may concern: Be it known that-I, GEORGE J. HAGAN, residing at Perrys ville, in. thercounty of Allegheny and State of Pennsylvania a citizen of the UnitedYStates, have invented or discovered certainnew' and useful Improvements in Bar and Sheet, Heating Fur v,naces, of ,which improvements the following is a specification. I 'the'manufacture'of metal sheets the steel or iron is reduced to what is known as I sheet bars which are heated and reduced in pairs. After a pair ofbars has been reduced to a certain thickness, a'second and sometimes a'third pair of bars is similarly reduced and the resulting partially formed sheets are arranged in a pack'and raised to a rolling temperature; If light gauges are desired, the sheets are, doubled before being arran ed in packs. Furnaces yhave been built aving separate chambers for heating the bars-and partially reducedsheets, said furnace beingso constructed that the chambeers are heated in sequence from acommon combustion chamber; v'l?hechunbers are so constructed and arranged that there is not sufficient travel of the products'of combus- (ion in contact with the charge therein to efiiciently heat the same,yand hence it has been necessary in the use of such furnaces to maintain a temperature in the first chamber much higher than is desired or required to heat the charge therein to the proper temperature. The object of the invention described herein is to provide'a furnace havlnga plurality of heating chambers, so constructed andconnected that two or more chambers will be heated in sequence and also rproviding for such a long traverse of the products of combustion in the respective chambers as to ensure thent'ilizati'on of a large percentage of the B. t. u.s generated in the combustion of 'thefuel. The invention is hereinafter more fully described and claimed. I In the accompanying drawings forming part of this specification,- Figure'l is i a sectional plan view of a furnace embodying the'improvements claimed'herein; Figure'Z is a sectional elevation on a Figure 8 a sectional'ip'lan view i to Figured, but illustrating a modification}:- ofthe'constructionof the furnace; I i ' ure 3;: and ' I Figures 5 and 6 are'viewssimilartoflFigures 1 and '2 illustrating a moclificatio'nflof h n'that the portionemployed fo -h ting. the bars is preferably i formed by or con- 4 I5 Figure at is a sectional elevation-on a plane indicated by the line IY IV F ig i respectively on' opposite sides of the sheet Figures 1 to 4. 3 Or if desh'ed the bar heathearth '3 may be employed for supportingthe bars to be heated, it is preferred tou-se construction known "in the art as the Allishearth, shown-and'des'cribed in the sundry Letters Patent tot'llhornas VJAllis. The bar orpairheatingchambersj are; so I constructedthat the bars maybe fed into a one end of the furnace by a@ suitable push?" ing mechanism 4' and "discharged from the opposite'end, the openings at the charging heating portion or chamber2, as shown; in end being normally closed by doors 5, and the discharge openings which are preferably in the: front'wall of the chambers are normally closedby doors 6'. As the sheetvbars" nace; considerable time is required for the heating of the same," whereas the-partially reduced sheets have large surfaceareasand can therefore be quickly heated, the sheet heating chambers being formed substanare comparatively thick= and are arranged in piles while being passed through the furitially shorter than the pair heating-sham here. In the construction shown in Figure v1; fL 'GOIDbIlSlZlOIl chamber 71s arranged in the rear of the sheet heatlng chamber and intermediate the rear (portions. of theabar' I heating chambers andf'products of combu's tion may either flow over abridge wall into; sists of two sections or chambers 1 arranged 6 4 the sheet heating chamber or through ports or openings 8 into the rear ends of the pair heating chambers as shown in Fig. 3. lVhile in the construction shown, provision is made for the Combustion of coal fed into the combustion chambers by a stoking mechanism 9, "it will be understood that'other forms of fuel known in the art, both gaseous and liquid, may be employed in heating the furnace. I I I i In, the construction shown in Figures 3 and 4 the products of combustion pass lat-- erally through ports 8 in the side wallslO common to the bar and sheet heating chambers, and also forming the end walls of the combustion chamber 7, and flowing along the bar pair heating chambers towards the discharge end thereof" and pass through ports 11 communicating with the front or ing chamber. charging, end of the sheet heating chamber 2. The" flow; of products of combustion through these ports 11 into the. sheet heating chamber is controlled by dampers 12 which in theconst'ru'ction shown consists of. tiles movable transversely of the ports 11. The products of combustion in the sheet, heating chamber flow'to the rear thereof and escape through ports1'3' into fiu'esM leading to the stack, said flues being formed in a wall 15 intermediate the sheet heating chamber and the combustion chamber 7 As in somecases the gases, etc., escaping from the bar or pair heatingf chambers 1 into the sheet heating chambers may not have sufficient thermal units to properly heat the sheets in the chamber 2, provision is made for the introduction of an auxiliary heating means which in the construction shown, consists of a pipe. 16 for supplying liquid or gaseousfuel and burners 17 pro jecting into the front endof the sheet heat- In the construction shown in Figures 1 and 2, the wall 15 intern1ediate the combustion chamber 7' and the sheet heating chamber 2 does not extend to the top of the heating chamber but is made in the form of a bridge wall15 so that products oficombus tion. will flow "direct from the combustion chamber into and along the chamber 2 outthrough ports 11 in the side. walls of the sheet heating cl'iamber into the front end of the bar or pa ir heating chambers 1, along these chambers into fines or passages 18 con- I nected as shown in- Figure 2 to the stack; The flow of products of combustion through the several chambers to; stack is controlled by dampersQO- arranged in the fines. 18. I In this construction a relatively small percentage of the thermal units will be taken up in thesheetheating chamber and by reason of the long travel of; the products ofcombustion, etc., through the bar heating chambers, the lat-terwillj be raised tothe desired temperature. While the products of comheating chamber be reduced in temperature, the heat thereof will be above the temperature to which the bars must be raised for rolling, provided the bars are more or less heated when they reach the point where the products of combustion enter the chambers 1. In order to ensure this preheating, thechamhere 1 should be made of considerable length or substantially longer than would benecessary in the form or construction shown in Figure, 3. Incase it is found necessary, auxiliary heating means in the form .of a burner 1.9 for the combustion of liquid or gaseous fuel may be connected to the bar heating chamber 1 adjacent to the discharge ends; As shown in Figures 5 and 6 the furnace may be constructed with only one pair-heating portion or chamberl in which case such portion or chamber is preferably made of such width as to have a heating capacity sub- 'stantially equal to united capacities of the two chambers in the constructions shown in Figures 1 to 4. f It is characteristic of the improvedfurnace that the products of combustion flow in substantially parallel lines but in opposite directions in the respective chambers. I clalm herein as my 1nvent1on: v 1. A furnace having in combination independent sheet and pair heating po-rtions extending side by, side, a combustion chamber connected to one of said'heating portions, a stack connected to the other heating portion, said portionsbeing so connected that prodnets of combustion will traverse substair tialrly the entire lengths of said chambers. 2.;A furnace having in combination a sheet heating p.ortion,-a pair heating portion consisting of sections arranged on opposite sides of the sheet heatingportion, a-c'ombus- 3. A furnace having in combination a sheet heating portion, a pair heating portion conslstmg of sections arranged on opposite sides of the sheetheating portion, a-c'ombu-s tion chamber connected to--the sheet heating port1on,a stack connected to the rear end of the pair heatmgportion, and ports or openings connecting the front end of the pair heating portion with the front end of the sheet heating chamber. 1 i. A furnace having in combination a sheet heating portion, a pair heating chamber consisting of sections arranged on opposite sides of the sheet heating portion and extending beyond the rear end of thesheet heatingportion, a combustion chamber arranged 1n the rear of the sheet heating portion andv intermediate the pair heating por-v from their points of connection with the combustion chamber and stack. 5. A furnace having 1n combination a sheet heating portion, a pair heating portion extending alongside of and "parallel with the sheet heating portion, a combustion chamber arranged in the rear of 'the' sheet 10 MI heating portion and connected With the sheet heating portion adjacent to its rear end, a stack connected to therear; end of :the pair heating portion, said portions being-connected adjacent to their front, ends. In testimony whereof; have hereunto set I my hand. a v a ,1 . GEORGE JQHAGAN.

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