US1760954A - Feed-water heater - Google Patents

Description

June 3, 1930. D. w. R. MORGAN v FEED WATER HEATER Filed Jan. 18, 1928 INVENTOR D.w,.R.M'orali WITNESS ATTORNEYh DAVTD w.- n. MoEGAmpE swARTnMoEE, HOUSE ELECTRIC .sa ,MANUEACTUEINQ Patented June 3, `193,()-

VANTA `EENNSYLVANTA,Y 'AssIGnon To 'wEfsTING- COMPANY, n CORPORATION v 0E -TENNSYL- f f yFEED-WATER HEATER .l d

Appuaao idfiahhary 1s, 192s. semina-247,662,

My invention relates to feed water'heating systems, and imoref 'particularly "to multi-l stage, progressiveheating of feed water by means of regenerative heaters, and it has for an object, to improve the eciencyof systems of this character. y l y In the usual feed-water heating system, a quantity of motive fluid is withdrawn from Y f the prime mover afterpartial expansion and is passedV to 'a'heater where it is condensedto water at its own temperature,and thus, surrenders itslatent heat tothe feed water. In this way, a relati-velysmall quantity ofmotive huid can' be used to heat the feed water instages, and 'if the drains from the heaters are returned to the feed water, there is, theoy sured forall conditions of peratio'n.l

retically,'no thermal loss. i 1

Of course,^a certa1n additional amount of f fuel is required, tokgenerate lthe motive fluid which'does the actual vhea'timgz; ofthe feed water; and, if even a portion of the heat `for the feed water could be supplied from some source other than the fluid pressure' genera-V tor, it will be clear that a `savinginfuel could be effected. f Y

. It is well known that considerable Qpuantities of heat pass up the stack in thefflue gases Y and are never recovered.,Furthermorepin the feed water heatingsystems 0f the prior art, mechanical energy isy consumed in translating the feed' waterf'-throughy the-heaters.

account, due to the mechanical efliciency being lesskthan lOOVper cent, Hence, a' morev particular object vof my invention is ,tofpro vide a feed water heating system ofthe type described, which shall be adaptedstofac1l1- tate a transfer of heatfrom the lflue gases to the feed vwater-and-,which shall-be. socon-f; structed andrarranged that no mechanicalv energy need be produced .for translating the feed Water between the 'heaters'of thes'ystein,

Apparatus embodying the` features of myV vation of a steam power installation 'eqnippedl with a number of'regenerative,v feed water heaters, the heaters being "shown insection for purposes of illustration. p

- In accordance with'pmy inventiontaseries. f

of-jet heatersof-the barometric-typeare arranged at successively greaterele'vations in'V the'stack of a vpower plant. referably, in. fw.

eachmcase, the barcmetric legs of the respectiveheaters are of suiicient length to balance the pressures between thebleedpoints; and n thus, .no valves lare required.

By virtue ofthe arrangement ofthe lng system in the stack, a considerablequantity of the heat of the'fluegases istransferred to the feed water and in thisfway asaving in fuel is effected.Y Alsofthefbarometric type of heater willl create av suflicient vacuum tor Y.

draw steam from a.turbine,even undververy' light loads, so thateiicient. heating isas- I Referring now t0 the drawings for ai lbiet-vv ter understanding of my invention, I show a prime mover, suc/h asfthebleedertiirb'i'nev V'10, arranged to exhaustftdthe 'surface coni" 'removing condensatefrom v'the latter in'th'e manner well understoodin the'art.y Anon?,

take for flueA gases, such j as theffurnacestack,"

is indicated atj14 and, vin order-1 tojfprovide forirecovering'heat from the jgas'e'sjwhich ,pass `g up the stack'lt, I arrange a suitablepnumber of heaters 16-17'andl8i'within' this oift'ake structurei Y Y v n The heaters 16', 17 andjlSarejpreferably 1j et heaters of thebarometricftype and are `similarin all respects. Each heatefrco'mprgises* heater 17 .bytheltil'iiipe 23g-minnie die.,

charge chamber 22. ofthe heater 17' lis'iconyn'ected to thenoz'zle chamber 19l ofthe *heaterV 18- by the tail pipeQQl.l 1 Likewise, 'the "dis-4 ,Y

extraction pumpf'lQl isfarranged tqdischrge into thel line 28,Vwhch'is connected td the the suction*ofthe'boilerfeeden 111,.,-Qrderwemvideffcrjpssngfaiefei water through these heaters,1ythecondensate;`

nozzle chamber 19 of the uppermost heater 16, and relatively low pressure steam is bled c from the turbine 10, through the connection 29, to the mixing chamber 21 of the heater 16. Likewise, steam at successively higher pressures is bled through the connections 31 and 32 to the v mixing chambers of the heaters 17 and 18, respectively.

The various heaters are arranged respec- V tively at successivelygreater elevations and it Will `be observed that the tailY pipes 23 and 24 between the respective heaters are'of unequal lengths. The tail pipe 23 is made of'suiiicient length to maintain an adequate column of v points which are served by the connections liquid `to balance the .pressuresbetween :the bleed points of the turbine which serve the connections 29 and 31, respectively, 4while the tail pipe 24 is made of suf'icient vlength to provide lacolumn of liquid of proper height to balance the pressures-between the bleed 31v and32, respectively. In a similar manner, thei'tail pipe 26 ofthe heater 18`may be of suicient length to maintain the proper pressure at the suctionof the boilerfeed pump 27,or i'fthe space is not available to permit this, the pump 427 may be a" booster pump which merely takes the feed water 'from the tail pipe 26 and passes it onto the boiler feed pump. u

lIhe various heaters are preferably supported from the stack 14by means of suitable brackets or the like 33. rIhs is a desirable feature, inasmuch as where relatively high pressures are encountered a system of this'kind may attain a considerable height,

and the stack 14 provides an economical arrangement for supporting the variousheaters and, at the same time, some of the heat of the flue gases may be Vrecovered 'by vthe feed water.

In order to preclude the possibility of having the heaters become air bound, each ofthe higher pressure heaters is vented to the heaterV having the next lower pressure, and the lowest pressure heater is vented to the condenser. 1 The low pressure heater 16 is vented by means ofthe vent pipe'34, which is connected to the discharge chamber of this heater, through 4the angle T 36 and the conneca simple and eficient arrangement for effecting a transfer of heat from the iiue gases to the'feed Water and thus, for effecting a saving Vin Jfuel. By arranging the heaters at successively greater elevations, it is possible to avoid the use of valves and thus, to eifect an economy in this respect. It will also be observed that due to the arrangement of the heaters that the feed water may gravitate through the various heaters of its own accord and that jet heaters of this type are capable of withdrawing steam from the turbine under various conditions of load so that it is assured that .proper 'heating .of the feed water will take place. ,during conditions .of light, .as well as of heavy load onthe turbine. WhileIhave shown my invention in but one form, it will be obvious that it is not so limited, but-issusceptible of various changes and mo dilications without vdeparting from the sp'irit'thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are imposed by the priorart or-as are specifically set forth in the appended claims.

What I claim is 1. 'lfhepcombination with a stack for combustion gases, of jet heaters disposed at different elevations and at least one of said heaters being arranged in the stack, each heater including a heatingmedium'inlet, water supply inlet, and a heated water'outlet; means providing for the supply of heating media at diierent pressures to said heating medium inlets, the pressures varying inversely with the elevations of tlie'heaters; a tail. pipe connecting the outlet of each heater Vexcept the last to the water `inlet of the succeeding heater, said tail pipebeing of sufcient length to `provide a barometric column producing flow of water fromone heater to the succeeding heater, said succeeding heater Vbeing at a higher pressure; and means providingfor the withdrawal of heated water from the lowermost heater.

2. The combination with a stack forcembustionV gases, of supporting means arranged interiorly of the stack; a pluralityv of jet heaters, at least one of which is arranged interiorly of the stack and carried by said suportinfr means each heater including a heating medium inlet', a water-supply inlet, and a heated water outlet; means Vproviding for the supply of heating medium at di'erent pressures to said-heating medium inlets, the

pressures of theheating medium varying inversely with thek elevationsof theheaters;

and tail pipes Vfor connecting the heated water outlet of the preceding relatively low pressure heater to the inlet of the succeeding relatively high pressure heater, said tail pipe being of sufficient Vheight to effect circulation of water between the heaters.

Y In testimony whereof, I have hereuntosubscribed my name this A17th dayofJa-nuary, 1928. i Y Y Y DAVID W. R. `MORGAN-

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