Патент USA US2105821код для вставки
Jan. 18, 1938. 2,105,821l R. M. PARSONS FURNAC E lF‘ilecì Aug. 20, 1936 5 Sheets-Sheet 1 71]l fg' .10 79 \ MÉ \\\\ ` .I 79 74 72 www /\ \ \\ INVENTOR . . `/ïa//f/nï faisons w., BY . I / / / I/v. l ’f ’ RNEY Jan. 18, 1938. R. M. PARSONS 2,105,821 FURNACE Filed Aug. 42O, V1936 3 Sheets-Sheet 2 n. _É _tí y4 7mIR \\/ / / ////// BY Jan. 1s, 193s. ^ R. M. PARSONS 2,105,821 ' _ FÚRNACE Filed Aug». 20, 1936 3 Sheets-Sheet 3 INVENTOR Fal/4h /ï fàravm BY ORNEY Patented Jan. 18, i938 2,105,821 unirse srArE-s . PATENT OFFICE 2,105,821 FUBNAUE' Ralph M. rai-sons, chicago, nl., assignor fo The Ralph M. Parsons Company, Chicago, Ill., a corporation of Delaware Application August 20, 1936, Serial No. 96,939 10 Claims. (Cl. 122-356) This invention relates to furnaces and more particularly `to tube stills for use in oil cracking and reñning plants. In one embodiment, the invention is applied 5 to a furnace having a vertically elongated corn bustion chamber'containing a bank of radiant heat-tubes and a convection chamber disposed above the combustion vchamber in alignment therewith. The burners are located at the bottom 10 of the combustion chamber so that the combus tion gases are caused to pass upwardly over the various tubes in the combustion and convection chambers and are withdrawn from the top of _ the convection chamber. 10 An object of the present invention is to pro vide an improved means for mounting and sup porting the tubes in the combustion and convec tion chambersof a furnace of the above type. Another object is to improve the details of con 20 struction and method of operation of such a furnace. ` I Various other objects and advantages will be apparent as the nature of the invention is more fully disclosed. . Y ` A feature of the invention consists in the pro vision of a supporting frame located outside of i invention a's shown is applied to a furnace hav ing a combustion chamber I0 provided with side ' walls I I and end walls I2, and a convection cham ber I3 of smaller cross section than the combus tion chamber Il) located directly thereover. The convection chamber I3 is provided with side walls Id which may be joined to the side walls II 'by sloping sections I6. A hood I'I is mounted above the convection chamber I3 and is adapted to con duct the exhaust gases to a stack I8. The walls II and I2 may be supported upon side and end foundations 2l and ‘22, respectively. A ñoor 23 may be supported by a plurality of transverse beams 2d resting upon the side foundations 2| and central piers 25. Between the side founda 15 tions 2! and the central piers 25, rows of burners 26 and 27 are provided, which are inclined to ward the side walls so as to direct the ñame against said walls for heating' the same to radi ance. The burners 26 may be provided with a 20 ñared central passage 28 through which gaseous fuel and air for combustion are passed. The burners 2l may have a similar central passage 29 formed therein which communicates with a jet 30 supplied with liquid fuel and air or steam for 25 atomizing from pipes 3l. Air for combustion is the furnace walls and carrying trusses which supplied to the passages 29 from ducts 32, which support the various tubes. Both the convection receive the air from ducts (not shown) extending tubes and the radiant heat tubes are carried in ‘ upwardly along the side walls of the furnace. and terminating at the top of the side walls. It is 30 tube sheets which are hung from the above men to be understood that the burners 2S and 2l tioned trusses. The radiant tube sheets are sus may be used alternately depending upon whether pended below the convection tube sheets and ex tend vertically down the center of the combustion liquid or gaseous fuel is to be employed. The lower part`~ of the side walls II, against chamber to support the radiant heat tubes in a position to receive radiant heat from both of the which the ñame from the burners is directed, muy 35 be thicker than the upper part of said walls which furnace walls. ` y Various other features consist in the details are not required to withstand the same intensity of heat and are not relied upon to absorb the radi of construction and combination of parts, here inafter more fully set forth. 40 ’ ant heat and to re-radiate the same to the radiant ` Although the invention is capable of various uses, it will be understood from the following de scription and the accompanying> drawings, in which one embodiment thereof is set forth for purposes of illustration. us Ll In the drawings: _ Fig. 1 is a vertical, longitudinal section through a furnace embodying the present invention; Fig. 2 is a transverse section taken along the line 2-2 of Fig. 1; 50 ‘ Fig. 3 is 'a transverse section of the furnace taken along the line 3-3 of Fig. l; y v Fig. 4 is a partial section taken along line d-¿I of Fig. l showing details of the anchor for the end tube sheets; Fig. 5 is a section taken along the line 5-.-5 of Fig. 4; and Fig. 6 is a perspective showing the arrangement of the supporting truss and the means for sus pending the tube sheets therefrom. Referring to the drawings more in detail, the heat tubes, to be described. The side walls It 40 of the convection chamber I 3 may be of still thinner construction as they are subjected only to convection heat. The walls may have an outer covering 35 of impervious material, such as sheet rockor any material which will prevent escape of 45 air' or combustion gases. If desired, the walls may be made of monolithic refractory cement in which case they are substantially air and gas tight ~ and the outer lining may not be required. For supporting the walls Ill and I 6, and the 50 various tube sheets to be described, there is pro-> vided a framework comprising side buck stays 36 and end buck stays 31 which may rest upon the foundations 2l and 22, respectively. The side walls II may be anchored to the side buck stays 55 36 at convenient points' by suitable means not shown. . ' A set of vertical truss members 40' and inclined truss 'members 4I are positioned adjacent the side walls i4 and the sloping walls IG of the fur 60 2 2,105,821 nace. Suitable means, not shown, may be pro vided to secure the walls to these truss members. The vertical truss members 40 form a part of a vertical truss comprising a top plate 42, bottom plate 43 and bracing members 44. The tops of . the buck stays 36 are joined by the cross members 45 to the top plate 42 to form an upper horizontal truss. The upper ends of the inclined members 4| are joined to the side buck stays 36 by hori 10 zontal members 46. Longitudinal member 41 joining the side buck stays 36 at the point of at tachment of the horizontal members 46 forms, in conjunction therewith, a lower horizontal truss. The various truss members are preferably 15 joined together by welding to form a rigid struc ture. End and intermediate convection tube sheets 50, and 50a, respectively, are provided carrying convection tubes 5I and located in the convection chamber I3. These convection tube sheets 50, 56a are provided with hangers 52, 52a, respec tively, which extend over and seat in channels 53 carried by a longitudinal plate 54 secured to the top plate 42. - 25 The lower convection tubes 58 in the convection chamber are carried by end and intermediate lower tube sheets 59 and 59a, respectively, which are provided with hangers 60 and 60a, respec tively, extending through the walls I4 and rest 30 ing between gussets 6| on the ends of the hori zontal members 46 and on the bottom plate 43. Lugs 6 la are formed on the hangers 60 and 60a to engage the ends of the horizontal members 4B for positioning the hangers. The intermediate lower 35 tube sheets 59a carry suspended radiant tube sheets 62 which are formed with brackets 63 projecting alternately on opposite sides of the tube sheets 62 so as to support the two rows of radiant heat tubes 64 in staggered relationship. The end tube sheets 59 carry end radiant tube sheets 65 which are provided with apertures 66 in which the radiant heat tubes 64 are mounted. The end radiant .tube sheets A65 are formed in a plurality of sections which are joined together 45 by links 61. Each section may be provided at its lower end with a flange 68 which engages a yoke 69 carried by an angle iron 10 which ex tends through the end wall i2 and is supported by the end buck stays 31. The lower ends of the 50 radiant tube sheets 62 and 65 are joined by longi tudinal members 12 having forks 13 formed at the ends thereof which are seated over lugs 14 formed on the various tube sheets 62 and 65. The yokes 69 serve to anchor the end tube sheets high temperature to which they are subjected, are preferably made of alloy steel. It is to be , understood that suitable heat insulation may be used over the faces of the various tube sheets, if desired. ' - It will be noted that by suspending the radiant tube sheets from the lower tube sheets 59, all sup ports at the bottom of the furnace are eliminated and the supply of 'radiant heat from the walls of the furnace to the tubes is unimpeded. In this construction the maximum tube area is utilized for heat transferred and a maximum quantity of heat is thus transferred to the oil without caus ing overheating or carbonization thereof. Fur thermore, a substantial saving of weight is effected since the suspended tube sheets can be made lighter than tube sheets which are sup ported only at the bottom. The radiant tube sheets extend from a point near the bottom of the combustion chamber to the convection tube 20 sheets, thereby dividing the combustion chamber into two sections and causing the gases from the two rows of burners to pass upwardly on opposite sides of the radiant heat tubes before the gases are allowed to converge into the convection chain ber. The tubes 58 carried in the lower tube sheets 59 receive both radiant heat and the heat of convection, whereas the radiant heat tubes84 receive principally radiant heat and the convec tion tubes 5l receive principally heat of con vection. 30 This furnace is particularly adapted for oil cracking, the arrangement of the tubes being such that high temperatures can be employed and maximum heating eiiiciency obtained. The sus pended tube sheets arefree to expand as required, the flanges B8 sliding in the yokes S9 for this purpose. The anchors for the end tube sheets and the members connecting the bottoms of the various tube sheets form a rigid and strong sup 40 porting structure for the tubes which is cheap and convenient to install and repair. It- is to be noted that the tubes 58 are arranged in a bank having inclined sides which are di» rectly in the path of the combustion gases and are also exposed to the radiant heat from the furnace walls. These tubes protect the convection tubes 5| from the intense radiant heat and, be _cause of their independent support, can be re placed without disturbing the convection tubes. The suspended radiant heat tubes are located at the center line of the combustion chamber between the two rows of burners so as to receive heat from both side walls. The burners are in 55 65 in position against the end Walls I2 of the - clined toward the side walls to prevent direct furnace, whereas the longitudinal members 12 impingement of the flame on the above tubes. serve to secure the lower ends of radiant tube The location of the burners and the direction of sheets 62 and thereby form a comparatively rigid the flame can be varied according to the particu supporting structure for the radiant heat tubes 64. lar furnace. In some instances, particularly in It will be noted that the intermediate radiant large furnaces, the burners may direct the flame 60 tube sheets 62 are also formed in a plurality of vertically or somewhat toward the tubes provided sections which are joined together by links 15. the spacing is such as to prevent overheating In the above construction, the radiant tube or burning out of the tubes. sheets are suspended from the lower tube sheets Although a specific embodiment of the inven 59, the latter being hung on the framework of tion has been shown for purposes of illustration, the furnace independently of the upper tube it is to be understood that it is adapted to vari sheets 50. The weight of all of the tubes is ac ous 'uses and changes and modifications may be cordingly carried by the furnace framework in made therein without departing from the scope dependently of the furnace walls. The inde of the invention which is to be limited only in pendent suspension of the upper and lower tube accordance with the following claims when in sheets distributes the weight on the framework terpreted in view of the prior art. and also permits independent removal of the tube What I claim is: sheets for purposes of inspection or repair. The l. In a furnace of the class described, side upper tube sheets 5D may be made of cast iron, Walls defining a combustion chamber, additional whereas the lower tube sheets 59, because of the side walls defining a convection chamber located 75 2,105,821 directly above said combustion chamber, a frame work located entirely outside of said walls, a ~ bank of convection tubes in said convection cham 3. of said tube sheets being located adjacent said end walls and means extending through said end walls to anchor the lower ends of said last tube ber, tube sheets suspended from said framework sheets to said framework. and carrying said tubes, a vertical bank of radi ant heat tubes located at‘the center of said com bustion chamber, tube sheets for said radiant 6. In a furnace ofthe class described, side and end walls forming a vertically elongated combus -tion chamber, a vertically extending bank of horizontal radiant heat tubes located in the cen ter thereof and dividing the combustion chamber heat tubes suspended from said framework inde pendently of said ñrst tube sheets, and rows of 10 burners on opposite sides of said bank of radiant heat tubes to direct a flame upwardly between said bank and said first side walls. 2. In a furnace of the class described, side walls defining a combustion chamber, additional 15 side walls defining a convection chamber located , , ' into two sections, burners located in both sec 10 tions for supplying heat to both sides of said bank of radiant heat tubes, a framework located out >side of the furnace walls, a row of tube sheets carrying said radiant heat tubes, hangers secured to said tube sheets, said hangers extending through said side walls and being secured to work located entirely outside of said walls, a bank ’ said framework to' suspend said bank of radiant of convection tubes in said convection chamber, heat tubes within said combustion chamber, cer directly above said combustion chamber, a frame tube sheets suspended from said framework and 20 carrying said tubes, a vertical bankof radiant heat tubes located at» the center of said combus tion chamber, radiant tube sheets carrying said radiant heat tubes, hangers associated with said radiant tube sheets, said hangers extending 25 through the side walls and .being supported by said framework independently of said` first tube sheets, and rows of burners onv opposite sides of said bank of radiant heat tubes to direct a ñame upwardly between said bank and said iirst side walls. . 3.A In a furnace of theclass described, side and end walls forming a vertically elongated combus tion chamber, a vertically extending bank of horizontal radiant heat tubes located in the cen 35 ter thereof and dividing the combustion cham ber into two sections, burners located in both sec tions for supplying heat to both sides of said bank of radiant heat tubes, a framework located outside of the furnace walls, hangers extending 40 through said side walls and secured to said frame work and tube sheets carried by said hangers to suspend said radiant heat tubes within said com bustion chamber. ` ` - „ 4. In a furnace of the class described, side and 15à tain of said tube sheets being located adjacent said end walls, flanges formed at the lower ends 20 . of said last mentioned tube sheets and anchor ' ' means secured to said framework to slidably en gage said ñanges whereby expansion of said tube sheets is permitted. ’7. In a furnace of the class described, side and 25 end walls forming a vertically elongated combus tion chamber, a vertically extending bank of horizontal radiant heat tubes located in the cen ter thereof and dividing the combustion chamber into two sections, burners located in both sec 30 tions for supplying heat to both sides of said bank of radiant heat tubes, a framework located outside of the furnace walls, a row of tube sheets carrying said radiant heat tubes, hangers se cured to said tube sheets, said hangers extend,~ ing through said side walls and'being secure'd to said framework to suspend said bank of ra diant heat tubes within said combustion cham. ber, certain of said tube sheets being ~located adjacent said end walls, said last mentioned tube sheets `comprising a plurality of vertically dis placed sections serially joined together and means extending through said end walls to anchor each` section of said framework. , 8. A sectional suspended tube sheet comprising 45 end walls forming a vertically elongated combus a plurality of vertically displaced plates serially tion chamber, a vertically extending bank of hor izontal radiant heat tubes located in the center . joined together, a supporting framework, a hang thereof and dividing the combustion chamber er attached to the top section to suspend the same into two sections, burners located in both sections 50 for supplying heat to both s_ides of said bank of from said framework, yokes attached to said framework and vertical ñanges carried by each 50 section engaging said yokes to anchor the sec radiant heat tubes, a framework located outside of the furnace walls, a row of tube sheets carry 4tions to said framework. ing said radiant heat tubes, hangers secured to-said tube sheets, said hangers extending through bustion chamber, a supporting truss on opposite 55 said side walls and being secured to said frame work to suspend said bank of radiant heat tubes within said combustion chamber, and means ex tending through said end walls to anchor the lower ends of said tube sheets to said framework. 60 5. In a furnace of the class described, side and end walls forming a vertically elongated combus tion chamber, a vertically extending bank' of hor izontal radiant heat tubes located in the center thereof and dividing the combustion chamber 65 into two sections, burners located in both sec tions for supplying heat to both sides of said bank of radiant heat tubes, a framework located outside of the furnace walls, a row of tube sheets carrying said radiant heat tubes, hangers se 70 cured to said tube sheets, said hangers extending through‘said side walls and being secured to said framework to suspend said bank of radiant heat tubes within said combustion chamber, certain 9. In a furnace of the class described, a corn sides thereof, a tube sheet carrying a bank of 55 tubes, hangers on opposite sides of said tube sheetengaging said trusses to suspend the tube sheet therefrom, and an additional tube sheet hung from said first tube sheet and carrying a bank of radiant heat tubes located at the center 60 of said combustion chamber to receive heat equally from both side walls thereof. 10. A suspended tube sheet comprising an elongated plate having tube-carrying means, a supporting framework, a hanger attached at the top of `the tube sheet to suspend the same from said supporting framework, a vertical flange at the lower end of said plate'and a yoke perma nently secured to said framework and having a flange engaging behind said first flange to slid 70. ably anchor the lower part of said tube sheet to the framework. ' . RALPH M. PARSONS.