US1800356A - Jet-type water heater - Google Patents

Description

April 14, 1931. J. A. POWELL 1,800,356

' JET TYPE WATER HEATER Original Filed June 27, 1922 Patented Apr. 14, 1931 Lacasse JAMES A. POWELL, on READING, PEN-rrsYAANiA` JET-TYPE WATER HEATER Original application filed June 27, 1922,k Serial N'o. 571,267; Divided and this application ffled 'February 26,1927.' Serial No".^1'71,161. K t

This invention relates'. to Water heaters, andfparticularly' to heaters of the jet type, and this application is a divisioni of my application liled J une 27, 1922, and serially .V numbered 571,267, Which matured into:

' the increased. volume of 'Water is not heated Patent 1,621,853 on'March 22, 1927.

An object of the invention is -to produce ajet type Water heateiwhich Will operate effectively and efficiently under Widely kvary'- ing conditionsof steam and WaterffloW.

Fig. 1 of the drawing accompanying and forming a part hereof, is a transverse section of a Water heater constituting one Y embodiment of KLmy invention, and Fig. 2 is i5 a vieu7 in section taken on line 11-11 of Fig.

1, of a divided water box.

lIt isl Well established that the over-all efficiency of a :power plant is increased by heating the feed Water before delivering it to the boilers. Toaccomplish this econom-- ically, it is necessary to A avoid a-Waste ofV heat in the operation of withdrawing air or other non-condensable fluids from` the heater. Itis alsofessential to 'avoid the loss of steam particularly on ship-board 'or in localities VWhere Water suitable forlfeed Water purposes is scarce.

An object ofmy invention, therefore, is the `production of'a jet typ'evvater heater .30 Which operates economically undervvidely .varying conditions of steam and Water' flow and Which avoids Waste of heator steam in the operation of withdrawingl the vnoncondensable fluids from the heater.

Itis usual power-house practice to heat the feed Water with steam exhausted froml one or more steam driven auxiliaries.

The feed .Water 1s made up 1n partlof condensate received from the condensers- 10 serving the prime movers and Where jet condensers are'employed itis vmade up inpart of 'raWy Water, consequently, the quan tity` of Water delivered to the -feed Water heater varies With variationsin the loadon the'prime movers, While the flow 'of steam,

from the auxiliaries is more constant. It is, therefore, consideredl best practice to so proportion the` number of 'auxiliaries ex-A hausting into eachf lheater l.that vthe heaters V" Will'. operate.- economically under conditions occasioned by the most normal load on the.- prime-moversA With heatersnovv in.use,a. variation above and below suchfconditi'ons. vvilluoccasiony a. loss in. theeiiiciency of zthe heater. .'Under supennormal load conditions- Water. decreases the capacityv ofsl the heater to .absorb-1 heatl and to condense the steam delivere'dftoit.: The; surplusy steam inthe heater, therefore, jincreases the backpresf` lsurexon the auxiliariesfand this in turn reduces the eiiciency i of the auxiliaries and causes them to demand more steamA in order tol accomplish the Work required of. them. Under such conditions the surplus -v steamso A mustbeI discharged from theheater-and it` is ordinarily vented tov the atmosphere withV a resultant Waste ofv both heat and Water.

While the/jet type/of lheater islsuperiorj to 7other vtypes both from=the standpoint of operation, first lcost and maintenance, the

` difficulties .encountered in'other heatersv are accentuated` in the jettype and .particularly under conditions offlovv ,Water supply. This is'due-.to the fact that ay jetvtype of heater,

such as noW employed Awhen designed for normal load conditions on'the maingenerat-l ing units is. incapable .of occasioningr thev necessary intimate intermingling ofI thev Water andy 'steam lunder :subnormal load .con ditions. As a result, much of the steam deliveredto the heater yis not subjectedtothe cooling-.effect of such Water as is present 'in'.y the heaterfand-.is therefore, (vented to the atmosphere at substantially its incoming temperature, v

In carrying out my invention, I provide a heater in which a number of groups of spray nozzles are employed and Ialso so` locate and arrange the different groups of nozzles that anl effective carrier of water In the drawings I have shown a form of heater embodying the desirable features of the heater illustrated in my above mentioned application, which matured into Patent No. 1,621,853.` As shown, the heater is equipped with a single steam header but is provided with a divided water box so arranged that the water entering the heater will be broken up into a mass of separate drops of spray by 'spray nozzles even under conditions of low water flow. As shown, the casing 30 is provided with an air oitake port 35, a water discharge port 36 and two series of spray nozzles 31v and 32. Heating steam from auxiliaries or any other source of supply is preferably delivered to the upper portion ot the heater through a port 39.

The spray nozzles 31 communicate with a water box 34: which receives its supply of water through a pipe 16. This water box preferably extends half way around the casing 30 and the nozzles are preferably of less capacitythan the nozzles32 so that they will break the water up into spray even under conditions of low water flow. The nozzles 32 communicate with a water box 36 which is, in elect, a continuation of the water box 34 except that its water distributeV ing space is partitioned od from that of the box 311-, `Water box 36 is in effect a continuation of water box 24 because box 36 receives water supply through a pipe or passage 17', which communicates with or is tapped oil the pipe 16, as shown by the broken pipe connections in the drawings. Under such conditions, the nozzles 32 only receive water after the supply is in excess of that which can be delivered through the nozzles 31 and as a result the nozzles 31 receive a substantially constant iiow of water, even under varying water flow orlow head conditions,

whereas the nozzles 32 receivek water only under conditions of full iowor high head. I have also shown combining cone 19 which corresponds in function, location and arrangement, to thecombining cone 19 of said application. In addition, I have illus-v trated an upwardly projecting annular flange 37, notched at its upper edges and so arranged as to segregate a water receiving channel 38 which is located immediately below the spray nozzles 31 and 32 and sur rounds the interior of the casing 30. Under such conditions, such water as is delivered to the interior ot the heater by either the spray nozzles 31 or 32 without being broken up into spray, collects in the channel 38 and overflows over thenotched edge of the liange 37. This water is therefore broken up into separate streams by the notches and is turther broken up into drops as ity falls through the interior of the heater. may be subdivided by partitions so that each subdivision receives water from one series of nozzles.

The channel 38 which is formed in part by the notched flange may be considered.

flow into a mass of spray even under widely,

varying conditions of water flow.

It is preterable to employ an airpump or air ejector for withdrawing the non-con` densable vapors, air or other non-condensable iiuids through the port 35. The water disch. rge ports 36 may communicate with ay storage tank or it may communicate with a tail pipe or with the intake port of a pump fordelivering the heater water to a storage tanl; or other suitable receptacle.

While I have described an embodiment of my invention, it will beapparent to those skilled in the art that variousV changes, modilications, substitutions,additions and omissions may be made in the apparatus illustrated, without departing from the spirit and scope of thel invention, as set forth .by the appended claims. Y

I claim: l. In combination in a jet typewater heater, a shell, a dividedwater box, a separate water delivery port communicating with each division of the water box, a separate series of spray nozzles communicating with each division of the waterbox, each series of nozzles being of different capacity from the other series, a steam inlet port located above the water box, an air oiiitalre portlocated below the water box and a water collecting channel located Vbetween the spray` 'nozzles communicating with each division of said water box and receiving water therefrom, each series of nozzles being ofl differi ent capacity from the otherfseries, a converging cone extending' downwardly below saidwater box and a water receiving channel located between said cone andsaid spray' vinlet port and said air off-take port, a parti-k tion dividing said box intofcompartments, a separate series of spray nozzles communicating with eachcompartment of said box, one

series of said nozzles being of greater water delivering capacity than the other, a converging water collecting passage extending downwardly within said shell from a point adjacent said water box to a point below said air off-takeport and an independentA water supply communicating with yeach compartment of said water box.

4. In combination in va jet type water heater, a shell provided with a'steam inlet port, a water discharge port and an airofftake port located between said first mentioned ports, a divided water box extending around said shell and located between said inlet port and said air offtake port and having a separate series of spray nozzles communicating with each division of said box, an annular water collecting channel located below said nozzles and above said offtake port and a downwardly converging combining cone below said channel and between it and said oiftake port.

5. In combination in a jet type water heater, avshell provided with a steam inlet port, a water discharge port and an air offtake port located between said first mentioned ports, a divided water box located between said inlet port and said air oiftake port, each division thereof provided with a series of water discharge nozzles of different capacity from the water discharge nozzles of other divisions, an annular water collecting channel between said nozzles and said air oftake portand a downwardly converging combining cone between said channel and said air offtake port.

-6. In combination in a jet type water heater, a shell having a steam inlet port at the top thereof,` a vwater discharge port atv the bottom thereof andan air ofi'take port intermediate said first mentioned ports, a divided water box between said. inlet port each other, and a separate water supply communicating with each division of said water box.

7 i In combination in a jet type water heater, a` shell provided with a steam inlet eport, a water discharge port and an air off'- take portV located between said first. mentioned ports, a divided water box surrounding said heater and located between said ins letport andy said air offtake port, eachy division of which is provided with'a series of water discharge nozzles of different capacity from the nozzles of the other division, an annular water collecting channel located immediately lbelow said nozzles and provided with a notched overflow flange, 'and a downwardly converging combining cone located within said heater and immediately below said channel.

8. In combination in a feed water heating system, a jet type heater comprisinga shell having a steam inlet port and a water inlet port and provided with av series of -spray plane and arranged to deliver water to be heated in intersectingstreams to the interior thereof, anl annular V-notch weir located within said heater and immediately below said nozzles, and means for maintaining a vacuum in said heater.

In testimony'whereof, I have hereunto set my hand this 24th day of February, 1927. JAMES A. POWELL.

nozzles located in substantially the same Y io;

and said air offtake port having a series of discharge nozzles communicating with each division thereof and of different capacity from the supply nozzles of other divisions,

the nozzles of each division being located in substantially the same plane and arranged to discharge Huid in streams intersecting

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