US1934072A - Superheater boiler - Google Patents

Description

Nov. 7, 1933. w KEENAN, J 1,934,072

SUPERHEATER BOILER Filed March 22, 1927 3 Sheets-Sheet 1 Z lNVENTOl? Nov. 7, 1933- w. F. KEENAN, -JR 1,934,072

SUPERHEATER BOILER Filed March 22, 1927 3 Sheets-Sheet 2 INVENTOR MTCiNEY Nov. 7, 1933- w. F. KEENAN, JR 11#934,072

SUPERHEATER BOILER Filed March 22, 1927 3 Sheets-Sheet 3 INVENTOR M444 Tie f/zisfA/A Jk M WW ATTORNEY patented Nov. 1933 Y I Y c r I UNETED STATES. PATENT, GFFlCE-lx I v 1 934,672 v I l SU E HEA I E 'Walter F. Keenan,- Jr.,-Pelharn;N. YL, assignor to Foster Wheeler"Corpora.tion, Newf York,

N. Y., a' corporation of New York AppiicatienMarch 2%1927. Serial No.' 1 77,280 1- Clainiu '(Cl. 122481) The general object of the presentinvention is verse passage of the tubes by the heating gases, to provide a boiler furnace with a superheater The boiler shown is. primarily designed to; be arranged to absorb radiant heatfrom'the coin-; heated by the combustion of oil admitted 'to the bustion chamber of the boiler and so located and combustion chamber through the inlets D in the 5 disposed with respect to. the combustion chamber lower portion ofthe front wall of the boiler hous- 60 walls and the fuel burning provisions that. the ing-for the burners-D. Asshown, the masonry superheater may absorb radiant heat from the walls of the boiler housing'are provided with air combustion chamber at a desirably rapid rate, channelsA through which air for combustion and mayv exerta highly beneficialcooling action maybe drawn with the double object of cooling on the combustion chamber walls, and at the the .walls and of preheatingth'e air for combus- 65.

same time the super-heater will not be subjectflto tion, but I have not thought it necessary to illusflame impingement. trate the connections for passing the air or fuel- The various features of novelty which .charto the burners, or the details of construction of acterize my invention are pointed out with par.-; the latter, as such features of constructionsare ticularity in the claim annexed to and formingv not essential features of the present, invention and 70) a part of this specification. For a better undermaybe of well known type. 7 standing of the invention, however, and the ad- The front wall of the combustion chamber vantages possessed by it, reference should be had above the burner inlets D is lined by the radiant to the accompanying drawingsand descriptive heat absorbing elements F of a radiant heat matter, in which I have illustrated and described superheater of known type. V The superheater as Z5 preferred embodiments of my invention. shown comprises vertically disposed inlet and, Of the drawings: Q p outlet headers F and'F between which the Fig. 1 is a section on the line l -1 of Fig. 2; elements F- whichare horizontally disposed, are

- Fig. 2 is a front elevation of a boiler; 7 connected to the headers attheir opposite ends Fig. 3 is a partial section on the'line 3 -3 of by transverse tubes 1. The elements F areshown so Fig. 1 and as of thick walledtubes rectangular in-cross Fig. 4 is a sectional elevation of, a boiler of section and uniting to provide a smooth condifferent type from that shown in 1, 2 and 3. tinuous heat absorbing surface extending from In Figs; 1, 2, and 3 of the drawings, 1 have illus a level just below the bottomof -the front boiler trated the use of my invention in connection with header B to a level somewhat ,abovethat of the 85 a boiler A heated bythe combustion of fuel burnt upper'burnersD. The elements F are supported in suspension as powdered coal, oil or gas is by a metallic supporting framework G which burned. As shown the boilerAis of the horizontal incorporated in and forms a part of the front cross drum type, though it is to be understood wall of the boiler housing and to which the ele-J .35 that the invention is capable of use with other ments F areconnected by pins G and yokesF '90 types of water tube boilers. As shown, the boiler welded to the elements. H represents suitable comprises an upper front box header B and a refractory heat insulating and leakage pre lower rear box header B. The headers B and B venting material interposed between the outer are connected by so-called horizontal water tubes sides of the elements F and a metal plate y se- 40 b slightly inclined to the horizontal, as is usual. cured to and forming a part of the frame work 95,:

The-upper portion of the front header B is con- G. As shown, the radiant heat superheater is nected to the steam and water drum B by horiconnected in series with a convection type superzontal circulator tubes 2), and the header B is heater comprising elements I located between connected to the drum B by nipples b Baiiies .the water tubes b and b, but the use or" a con- C, C, and C may be provided to give the heating vection heated superheater in conjunction with gases rising from the'combustion chamber A, the radiant heat superheater forms no partor" beneath the water tubes a multiplicity ofpasses the present invention. As shown, the elements across the latter before the gases reach the heat- I of the convection hea p at l ar F05 ing gas outlet A The baffles C and C, as shown, 13 elements of the U- type wlme'cted at 50 are arranged to expose the lower rows of water their ends to inlet and-outle h ers? and I tubes for their full length to heat radiation-from J represents a steam p p f r p in st m from the combustion chamber A and to contact with the outlet header 1? of-tht Gimvectiml 'h the heating gases rising from said chamber, and superheater to the inletheader F of the radiant to cause the heating gases to pass across the heat superheater. -Steain passesfrorn the steam ,55 higher ends oi the upper tubes in the first trans and water druin' B tothe inlet header of the 10 convection heated superheater through a pipe K.

The location of the radiant heat superheater as shown in the front wall of the combustion chamberA' above the burner inlets D eliminates practically all possibility of tongues or jets of burning fuel impinging against the face of the superheater. This is highly desirable as flame impingement against the metal walls of a radiant heat superheater is quite injurious, particularly with the high temperatures obtainable in burning oil or the like fuel under efficient combustion conditions and with preheated combustion supporting air. Furthermore, the location of the radiant heat superheater illustrated and described is highly advantageous since'it directly faces the rear wall of the combustion chamber toward which the burning fuel jets are directed and which therefore is adapted to radiate heat at a relatively high rate to the radiant heat superheater. In consequence, the amount of heat absorbing surface'of'the radiant heat superheater required for a given superheating effect ;is minimized, while at the same time the rear wallof the combustion chamber is subjected to a cooling action especially desirable because of the objectionably high temperature which it would otherwise attain. The location of the radiant heat superheater at the front and high end of the boiler above the burners D is convenient and desirable from the construction and maintenance standpoints as -a superheater so located is readily accessible for inspection and repairs, particularly in installations in which burner inlets in some cases, the general advantages of locating the superheaterin a vertically disposed wall of the combustion chamber" way from which the fuel jets extend so as to avoid flame impingement against the superheater, and so as to absorb radiant heat from an opposing wall towards which the burning jets travel, are not dependent on whether the super-' heater is located above the burner inlets, or below the burner inlets, or is divided into sections located oneabove and the other below the inlets.-

'I'he invention may be used, with advantage with boiler furnaces fired by the combustion of coal burned on a grate as shown in Fig. 4, where absorption, and is in a position in which it is to a substantial extent free from exposure to flame impingement as the burning gases are directed away from, rather than toward the wall containing the superheater, as they pass toward the tube bank pass at the right of the lower longitudinal tube bank bafile C In accordance with the provisions of the statutes I have illustrated and described the best form of my invention now known to me, but it willbe apparent to those skilled in the art that cha'ngesmay be made in the form of the apparatus disclosed without departing from the spirit of my invention as set forthin the append ed claim, and that certain features of my invention may sometimes be used to advantage without a corresponding use of other features.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:- 7 i, The combination with a steam generator combustion chamber having a pair of opposed refractory walls and water tubes arranged above said combustion chamber, of a radiant heat absorbingsuperheater lining one of saidrefractory walls and formed bya plurality of channeled metallic elements having one side directly exposed to heat radiation from said chamber and opposed refractory wall, fuel burning means araway from said superheater and towards saidopposed a refractory wall,

thereby minimizing flame impingement against the exposed sides of saidsuperheater elements v I i WALTER F. KEENAN, JR.

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