US1781836A - Plant for the generation of high-pressure steam - Google Patents

Description

Nov. 18, 1930. F, 'FLATT 1,781,836

PLANT FOR THE GENERATION OF HIGH PRESSURE STEAM Filed July 19, 1926 ter'is possible] On the other handthere is Patented Nov. 18, 1930" (FRITZ FLATT, or RICH-,1swITzERnANnjAssIeNoR Torrie FIRM Ax'rrnivensiiimsonnr'r DER yP Application filed July 19,4926; Serial No Plants are already known for the generation ofhigh pressure steam in whichthe steam, 'generatedin a coil of pipe, is passed directly-to the steam consuming means. In

- 5 such plants only a feed pump-and therefore no circulating pump has to be provided. The

'idisadvantage of plants of this type'is how- .j ever, thatthey do not adapt or accommodate themselves to a su-fficient extent to the fluctuati'ons :in the load on" the steam consuming means as they'possess neither water nor steam accumulators: Consequently when the load;

decreases. suddenly there is great risk of explosion, while if theload increases-suddenly and greatly too little steam is available. There is also risk, when th load increases suddenly and greatly, that too little heat-is" immediately transmittedto'the coil of pipe so that the steam generated carries with it much water in the form ofspray; which'first collectsin the coil of pipe and may passf'afterr wards into the heat consuming 'means'prov- 'ing in many cases injurious thereto. v

Plants are also alreadyknownf-forthe gen-, eration of high pressure steam in which steam is highly superheated in a superheater constructed as a coil ofpipe, part being passed fromlthis superheater directly to the steam consuming means whilethe remainder passes ,toajwater reservoir, where it gives, up its superheating heat to the water contained therein and thereby efiectsa partial evapora-s tion of this latter. 5 The steam thus generated ,in the water reservoir is then forced into the superheater again by v a circulating pump. The advantages of plants of this type are that thesuperheating of the steam in'the *c-oilof pipe is substantially uniform for all loads'on the steam consuming means and that no chilling of the tubes by mixtures of steam and wagreat risk of explosion in plants of this type should the circulating pump fail to act properly. i This latter also requires a great amount of power to operate it as, in order to' 1 overcome the resistance of flow and to produce the necessary high'velocity of flowin the super-heater, the steam drawn from the water reservoir has to be compressed to a comparatively high pressure: 7 Furthermore the i rtAiN'r mama eENERa'rIoN or 'riien rn-nissuan' (123,469) and in Switzerland 1 22, 1925. a

MASCHINENFABRIKEN, scnna wYssv & CIE, or ZURICH, sw rz sacoefficient of heat. transmission on the super-v heater 'lssmall 'as there is only transference great superheatingsurface is necessary; as the otheattothe superheated steam so that the v C011 is sub ected to accumulations of heat and imay veryeasilybe burnt-out. Furthermore whole of the heat=of evaporation and superheatinghas tobe taken up in the superheater.

A further advantage isthat a separate auiriliary boiler has .tobe'. provided for starting.

The object of thefipresent 'finventionis 'thereforeto provide a pla'ntwhich possesses the advantages'of-the plants above described but/not their disadvantages; For this purpose according to this invention the coil of pipe in a plantfor the generation of. high pressure steam iniwhich heat required for:

'evaporationis'taken up in a coil-of pipe, is

fed by means of a'feedpump under high pressure with a fluid taken from' a feed pipe and.

the superheated steam produced in this coil gives ,up its superheating heat in a water reservoir to the water. contained therein,

thereby 'eflecting' a partial evaporation of the latter; -TA' water feed pipev is. also connected tothe water reservoir in addition tothecoil of pipe. 1

' Inthe accompanying'drawing is diagram-.

matically shown, by way .ofexample a con structionaccording to the present invention. In thisdrawi'ng 1 denotesa'feed pump which 1 is supplied with water throu gha feed pipe 2 The pump '1 delivers. waterunder high pressure into a pipe .2, which is provided ''with the coils?) and 4 which are exposedto the hot fire gasesproduced in .a burner 13 and'to the radiant heat of the furnace 14. 'In-these coils 3 and i the heat necessary for evaporation is taken up; and as the pump 1 already delivers ata high pressure into the pipe 2, a comparatively high pressureexists in the coils. The pressure of the steam generated and superheated in the coils3 and't can be=regulatedand throttledby means of devices 5' and the steampasses into a water reservoir '6, where, byadmixture with the I water contained therein and partial evaporation of thelatterflt gives up its superheating heatand isfor thevmost part condensed.

As the steam generated in the coils 3 andeis superheated the thermal content of the steam flowing into the reservoir 6 is so great that even'water can be added to this reservoir 6 through a feed pipe 7 directly connected thereto. The steam generated in the water reservoirpasses through a pipe 8 into a superheater 9 and thence to a steam consuming device (not shown). In the plant herein-described no. great superheating surface is nec- .essary, because in the superheater only the superhea-ting heat has to be taken up which it needs to evaporate the liquid flowing in through the pipe 7."

The feed waterdelivered by the feed pumps 1 and 12 through the pipes 2 and? vmay be previouslyheated. For this purpose gforinstance the waste heat of tlie fiueigases wvoir 6 may be :fed with fresh "water.

' coil l, filled for the mostspart. with-super-t .inay be used-as'shown in the figure where '11 denotes a feed-w'aterheaterheated by waste gases. 'In the arrangement shown:an-intermediate superheater 10 is disposed-between :thesuperheaterQ and the feed-water heater l1; Whenever possible ;it is'recommended that condensed water be-used as the liquid to be 'fed tothe coilof;pipje whileithe'reserthe plant described itistquite possible to "so arrange the coils 3, :4 that the hottest fire gases come 'into contact (with the coil *3 first, where an exchange of heat takes'placermuch "more easily than one between; fire gases and .superheatedsteam. "On the other-hand the heatedsteam'can be soarranged that itonly comes into "contact with gases which'arealreadycooledidown, so'ithatzit isfnot exposed to any dangerous accumulations :ofzheat.

The plant'hereindescribed comprises fea i turespersewell kI10WI1;.EJShOTVGVQIIlIIilt all the disadvantageof the'plants' aclmowledged in the introduction to :this specifi'cation 'to-lbe already known do not exist, it constitutes an important improvementasitiipossesses all the wadvantages ofthose plants.

I'claim: ,w 7. H 1'. A plant ifor' the generation of -super-' heated high :pressure'stea'm,zcomprising in combination, ;a furnace, at coilof pipe arranged inthe-streamiothot firesgaseszof the furnace, a feed pumpzto zfeed water under high pressure to said'coilandin which the water is converted into steam and superheated, :a water reservoir into which the superheated steam from-said coil is led to evap: crate a part of the water ins'aid reservoir, zmeansto feed waterdirectlyinto said reservoir, a superheater connected to said reservoir, and means to lead steam from said superheater to a steam consuming device.

2. A plant for the generation of superheated high pressure steam, comprising in combination, a furnace, a COIl'Of pipe arranged in the stream of the hotfire gases of the furnace, a feed pump adapted to feed liquid under high pressure to said coil of pipe the latter, and a ,.conduit'connecting 'said' superheater to a steam consuming device.

3. A plant for the generation 'of superheated high pressure steam, comprislng 1n combination a furnace, a.coil of pipe arranged in the stream of the hotfire gases oi the :furnace, a feed pump-iadapted totfeed liquid under high pressure to. said coil .of pipe in which :the :liquid is lconvertediinto steamand'superheated,a rwaterireservoirzinto whichithe :superheatedsteam from said .coil

"of pipe 'is vled for causing evaporation of .-so1ne of the Water. containedinsaid reservoir, means :adapted to ,feed water (directly .into said reservoira feed water heater arranged -;in the current: ofthe waste-gases of thelur; pace: and 5 connected ;to :said rmeans, a superheater heatedby the waste gasesoitheffarna'ce and connected to saidlwater reservoir for. receiving: the steam generated in the datter, and aconduitconnectingsaidssuperheater toa steam consumingrdevice.

4. A plant afor ithe generation .of :superheated high pressure steam, comprising in combinatlon, a .furnace, alcollwof prpearranged-within the range .of thelhottest ffire gasesbf-the furnace, a feed ,pumpato Sfeed water under ,high ,pressure; to" the ,portion of the coiLnearest the fireuand in which water is convertedinto steamrandithe steam rsuperheatedlinqthe portion otthe coiltherebeyond,

:awater-reservoir into which the super heated ssteamifrom said coilis led: toevaporate apart yofz-the water insaldlreservolr, means to feed water directly into said reservoir, asuperheater, iand-xmeans. to rlead steam generated in the reservoir 'to said .rsupe-rheater and thence tol -a,steamtconsumingidevice. I

' :5. A planttfor the generation (of super- ?heated high ,pressure steam comprising in combination, a furnace, :a coil of pipe arranged within the range of the i hottesti fire gases. oi the furnace,-a feed pumpto feed condensedwater under-high pressureto the P 1- "tion of the coil-nearest thelfire and in which water .is converted into steam .and'the steam superheatedinthe portion of the coil therebeyond,a water reservoir-into whichlthe superheated steanrfro-msaidcoilis ledto evaporateia part of the wateriin said reservo r, meansto .feedfresh water directly into sald reservoir, a superheater lbeyond said coil, *and means to lead steam generatedllnitheressaid superheater. 6. ,A'steamageneratingiplant,

ervoirtoa steam consuming device through comprising a furnace, a coil of pi e arranged within the range of the hottest re gases of the furnace, a feed pump to feed condensed water under high pressure to a portion of said coil nearest the fire and in which the Water is'con-ve'rted into steam and the steam superheated in the coil therebeyond, a Water reservoir into which thesuperheated steam from said coil 7 is directly ledto evaporate part of the Water name to this specification.

thereinby'the superheating heat carriedby the steam hile condensin but a portion of. I

fresh Water direct .ly into said reservoir, a superheater beyond such steam, means to feed said coil andreservoir and connecud to the I latter, and means to conduct steam from the superheater to a steam consuming device.

a In testimony whereof, I have signed my FRITZ FLATT.

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