US1796717A - Feed-water heater - Google Patents

Description

March 17, 1931. T Q McBRlDE FEED-WATER HEATER 1926 2 Sheets-Sheet l Filed June THoMAs C. MQBRmE.

@e1/1to1 @513 M emo/mag March l?, 1931. T. Q MCBRIDE LYQ? FEED WATER HEATER Filed June 4, 1926 2 Sheets-Sheet 2 A um!!! Patented Mar. 17, 1931 UNITED STATES PATENT oFFlcE THOMAS C. MCBRIDE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO WORTHING- TON PUMP AND MACHINERY CORPORATION, 0F NEW YORK, N. Y., A CORPORATION OF VIRGINIA FEED-WATER HEATER Application, led .Tune 4,

vand to provide a feed water heating apparatus.v which, is compact, light in Weight, and will occupy a small space for installation.

Also in certain types of commercially known heaters, various types of automatic apparatus, floats, etc., for controls, some being dependent upon the water level within the heater, are provided while the present invention comprehends the provision of a feed waterheating apparatus in which the control requires no floats or other automatic apparatus, and one which, owing to the employment of a rotaryor centrifugal hot water or boiler feed pump, will provide a steady iiow in the discharge which will notl interfere with the boiler check, in contradistinction with the intermittent flow as`provided by displacement pumps.

Another object of the present invention is toprovide a ,feed water heating apparatus particularly adaptable for use on locomotives and which is,designed to facilitate the replacement or repair of parts with minimum eifort and without disturbance of the connections between the heater and locomotive parts. The above is accomplished by the provision of a feed Water heating apparatus in which the heating chamber and its closely related parts', in which replacement or repairs are seldom reo'juired, are formed in one casting or unit and attached to the locomotive at any convenient point, while the pumping mechanism is formed in a unit detachably connected, preferably at the bottom of the yheating chamber unit and free from any direct connection With theV locomotive, thereby permitting removal of the pumping unit for replacement or' repair wlthout affecting connections between the locomotive parts andthe heating chamber unit.

- Other features of the present inventionv 1926. Serial No. 113,620.

Water in the heating apparatus for priming the rotary or centrifugal pump which supplies the cold water to the heating chamber, said priming mehanisln also controlling the delivery of operating steam to the engine employed for operating thepumps, whereby in starting, dry running Vof the rotary or 'centrifugal pumps is prevented and their operation is automatically `set up when suflicient water is in the heating apparatus to fill the pumps; and the provision of suitable passageways and means for directing the exhaust steam from the pump operating engine or'turbine into the heating chamber of the feed water heating apparatus.

With these objects in view, the invention consists in various features of construction and combination of parts, which will be first 'described in connection with the accompany- Aing drawings, showing a feed water heater of the preferred form embodying the invention, and the features forming the invention'will be specifically pointed out in the claims. y

In the drawings- Figure l is a vertical section through the improved feed water heater.

Figure 2 is a fragmentary side elevation of the feed water heater taken on the line 2 -2 of Figure l.

Figure 3 is a fragmentary vertical section taken on the line 3 3 of Figure l.

Figure is a horizontal section through the heater on the line 4 4 of Figure l.

Figure 5 is a horizontal section through the heater on the line 5 5 of Figure l.

Figure 6 is a .horizontal section onthe line 6 6 of Figure l. Y

Figure 7 is a vfragmentary vertical section on the line 7 7 of Figure l.

with exhaust steam from locomotive cylinv ders or other suitable source which enters the f chamber 1 through the inlet 3.

The supply of cold water is from the tender (not shown) when the, heater is used on a' locomotive, and otherwise from any suitable source, through the pipe 4 to a 'rotary'pump 5.I The cold water enters the suction 6 of the pump 5 and is forced by the impeller 7 upwardly through the pipe 8 into the priming chamber 9 from which it passes through the passage 10 into the chamber 11 and thence through the spray valve 2 into theheating chamber 1. y

The pump impeller 7 is mounted upon the shaft 12 of the pumping unit 13 which shaft is driven by a turbine 14 mounted thereon.

Live steam, from anv suitable source is provided for operating the turbine 14 and this steam is delivered through a pipe '15 to a valve chamber 16 (see Figs. 1 and 4). The valve cone 17 in the valve chamber 16 is operated through a series of links 18 bv a iioat 19 which vis positioned in the priming chamber 9 so that the delivery of operating steam to the turbine 14 will be controlled by the quantity of water or the water level in the priming chamber 9, and when the heater is invvater-` heating and boiler-feeding operation the steam passes through the valve chamber 16. pipe 20. into the chamber 21 from which it passes into the turbine structure 14 for rotating the runner thereof. to operate the shaft 12 and the pumps mounted thereon.

In starting the heating apparatus or at such times when' the water in the heater is below a pre-determined level. the lowered position of the iioat -19 will position the valve 417 to prevent flow of steam to the. turbine 14' andopen 'the valve 16a to of the check valve, and through the cold water supply pump 5 and pipe 8 into the heating apparatus. When the operation of the iet pump 24 has supplied-suiiicient water to prime the supply. pump and to raise the oat 19, the raising of the float will operate the valve 17 to cut oii the supply of steam to the jet pump and open the passageway of v operating steam to the turbine 14, thus automatically setting up operation ofthe turbine and pumps.

The hot water, that is, the water which is heated in the chamber lpby its Contact with the exhaust steam entering the heating chamber, passes'downwardly through the chamber 1 into the chamber 27 which is an extension rthe first stage of the pump 29 through the passageway 30 into the suction ofthe second or successive stage of the pump 29, being dis` charged from the final stage of the pump through the suitable l'discharge passageway 31 to the boiler or other utilizing apparatus.

To prevent iiooding of the heaterby the varying excess of water dueto steam condensation in the'heater, an over-flow pipe 32 is provided which rises centrally within the chamber 1 a/nd the heightJ of which controls the water level in the heater, yany excess water in the heater iiows into the over-iow pipe 32 and passes downwardly into the chamber 33 of the pumping unit 13. The excess or overflow is taken from the chamber 33 by the return pump 34 which delivers it into the discharge of the cold water supply pump `5, returning it, with the cold water discharged by the pump 5, to the heater.

The cold water supply pum 5 being a centrifugal pump, the amount o water it delivers is largely controlled by the pressure of water discharged by the pump 5. Thus, when there is an over-flow ofl excess water from the chamber 1 through the over-flow .pipe 32 and return l(pump 34, the amount of cold water delivere to the chamber 1 will be in inverse proportion to the quantity of excess water returned to the chamber 1 through thedischar'ge of the pumps 34 and 5,

and when. there is no excesswat'er over-flowing from the chamber 1 the pump 5 will operate at full capacity and compensate for the lack of excess water in the heating chamber. J

Inv the drawings, the return-pump 34 is shown as comprislng vanes on the back of the v impeller 7 of the pump 5, and the chamber 33 is illustrated as having communication with the chamber of the pump 5 through a suitable opening 36.' 4Thus it will be seen that a single impeller or rotary pump 13 provided with multiple'inlets or suctions and a single dischargepermits the return of the excess water from the chamber 1 through theheater, and consequently, eliminates the loss of any heat which this watermight contain.

While inthe drawings the Vreturn of `excess water pump 34 is shown as vanes on the back of the impeller 7 of the pump 5, it is to be understood -that the return pump 34 may be separate and independent of the pump 5, if desired without departing from the spirit of this invention although it is desirable to have its discharge common with that of the pump 5.

If it is so desired, a check valve 37 of any approved construction may be mounted in the 10 delivery or discharge pipe 8 of the cold wa.-

ter supply pump so as to prevent water being forced backwards through the cold water supply pump when the locomotive drivers slip or under other circumstances which might arise, and a check valve 37 is positioned in the connection between the heating chamber 1 and the suction of the return or excess water pump 34, thus water will be prevented from flowing by gravity from high tenders or other high water supply sources, through the heater, which may be positioned at a low elevation, when the pumping unit is not operating.

It is desirable to utilize the heat from the turbine exhaust by delivering the said exhaust into the exhaust steam inlet 3, through the opening 60 as shown in the modified form illustrated in Figure 9, where it will mingle with the exhaust steam entering the heating chamber 1. However; in the preferred form shown in the drawings, the exhaust steam from the turbine 14 is shown passing from the casing 'of the turbine through a suitable outlet or exhaust opening 38 into a chamber 39. The exhaust steam from the turbine passes through a suitable check valve 40 from the chamber 39 into the chamber 40 from which it passes through the passageway 41 into the casing-42 of a jet condenser 4o construction 43. A by-pass 44 is provided in the heater structure which has inlet communication with the priming chamber 9 so that a part of the cold water delivered to the feed water heater by the pump 5 will be di-V 45 verted through the passageway 44, to the passageway 44 and be directed by the nozzle 45 through the tube 46 of the jet condenser 43. The tube 46 is perforated as shown at 47 so as to permit the exhaust steam from the turbine tobe taken up by the water passing `through the tube and condensed and any condensate which settles in the bottom of the condenser or chamber 42 of the jet condenser 43 will be drawn into the open, flared bottom of the tube 46, and will pass through the tube with the water and from the jet condenser structure 43 into the chamber 11 where it mingles with the cold water supplied to the `chamber 11 from lthe priming chamber 9 G0 `through the passageway 10, and will be delivered through a spray valve 2 into the heating chamber 1.

An air vent 49 is provided which has communication with the chamber 50 formed at the top of fthe chamber l so as to permit the escape of any accumulation of air from within the heater and a suitable cone or hood 51 is mounted over the top of the over-flow pipe 32 so as to prevent the cold water or condensed exhaust steam from entering the overflow pipe 32 from above. Movement of the check valve 40 is limited by a suitable stop lever 52 which projects into the chamber 40 in the path of movement of the check valve 40. A safety valve 53 is carried by the casing of the feed water heater and has communication with the exhaust steam Linlet 3.

The feed water heating apparatus herein described is particularly adaptable for use on locomotives, and for purposes of attachment to a locomotive suitable attaching brackets 60 are formed on the casting form` ing the heating chamber and its companion passageway and parts, while the pumping unit 13, which is attached to the lower end of the heating chamber carrying casting (the line of separation of the units being clearly shown at A in Figure 1 of the drawings) i's free from any attachment to the locomotive. This construction permits all of the attaching bolts to be in one casting, and accurately spaced, and permits detachment of the pumping unit 13 containing the more intricate parts of the feed water heating apparat-us, for replacement, repair or for any other purpose, without affecting the attachment of the apparatus to the locomotives and without disturbing connectionsV between the locomotive parts and the heating chamber unit.

The mounting of the various pumps 5, 29 and 34 and the turbine 14 on a single horizontal shaft 12 also facilitates the above advantages and permits the utilizing of smaller space for the heater as well as permitting the turbine and pumps which must have greater dimension than the heating chamber, to be located well down and fit under the curve of a locomotive boiler when the vfeed water heating apparatus is attached to the side of the boiler.

The operation of the improved feed water heater will be apparent from the foregoing description taken in connection with the accompanying drawings.: However, briefly summarizing, the operation is as follows:

rlhe cold or supply water is drawn from a suitable supply source such as a tender of the locomotive (not shown) by the rotary cold water pump 5 and it is delivered through the-v discharge 8 into the priming chamber 9 of the heater. From the priming chamber 9 the cold water is delivered through the passageway 10 to the spray valve 2 and passesthrough the spray valve in a sprayed manner into the chamber 1 where it engages with the exhaust steam from the locomotive cylinders entering the chamber through the exhaust steam inlet 3. .The contact of the cold water with the steam will heat the water and condense the steam and the resulting hot water 'and condensate will pass downwardly into the lower part 27 of the chamber 1- and be drawn therefrom into the initial stageof the multi-stage rotary pump 29. After passmg through the various stages of Nthe pump 29 'it is delivered from the discharge 31 of the pump to the boiler` to supply the necessary water to the boiler at a relatively high temperature. The ejector or jet pump 24 which is brought into operation by the low water level in the control chamber 9 will draw water from the cold water supply source sufficiently to prime thepumpl 5 and operate the float 19 which will voperate the valve 17 to deliver the line or operating steam .to the turbine 14'. .The excess or over-flow water from" the chamber 1 will be returned thereto by the return pump 34 through the discharge of the4 supply pump 5.

From the foregoing description taken in connection with the accompanying drawings, it will be apparent that a compact, efficient and relatively simple feed water heater embodying rotary or centrifugal turbine-operated 4pumps has been provided which willy eectively heat the feed, water and deliver it to the boiler with a minimum loss of heat and of power. By placing the pumping unit which comprises the supply pump, excess water return pump, the boiler feed pump' and turbinev on a single shaft, the weight and size of thefeed water heater will be materially reduced over types of similar heaters now in use and the heater will occupy a' .relatively small amount of space when in-v stalled. l

It will be understood that the invention is not to beJlimited to the 4speciiic construction or arrangement of parts shown but that these may be modified widely within the invention defined by the claims.

What is claimed is: v

1. In a feed water heating apparatus, a heating chamber, a pump for vdelivering water to'said chamber, a steam inlet for said chamber to permit contact of steam and water in the chamber, a pump for removing excess water from said chamber and having its discharge into the discharge of said delivery pump, a pump for delivering heated rwater from said chamber, and means for operating said-pumps. f

2. In a feed water heating apparatus, a heating chamber, a steam inlet for said cha-mber to permit contact of steam and water in the chamber, a pumping unit including a pump for delivering water to said chamber, a pump for delivering heated water from said chamber, an excess water pump for taking excess water fromsaid chamberand returning it-thereto, and means for operating said pumps. I

3. In a feed water heating apparatus, a heating chamber, a rotary pump for supplying cold water to said chamber, a rotary pump for vdelivering heated water from said chamber, and a. turbine for driving said pumps, said pumps and turbine mounted upon asingle shaft.

4. Ina f eed water heater, a heating chamber, av pump for supplying water to said chamber, a pump for delivering heated water from said chamber, and priming means controlled by water in the heating apparatus for priming said supply pump.

5. In a feed water heater, a heating chamber, a pump for supplying water to said chamber, a pump for delivering heated water from said chamber, a turbine for driving said pumps, priming means for priming said supply, and means controlled by water in the heating apparatus for controlling said priming means and controlling the delivery of operating steam to said turbine.

6. In a feed water heating apparatus, a heating chamber. a' pump for supplying wav ter to said chamber, a pump for delivering vheated water from said chamber, a turbine steam to said turbine.

8. In a feed water heating apparatus, a

housing, a heating chamber therein, a pump for supplying water to said chamber, a pump for delivering heated water from said chamber, a turbine for driving said pumps, said housing provided with passageways to lead the exhaust steam from said turbine intosaid heating chamber.

9. In a feed water heating apparatus, a housing, a' heating chamber therein, a pump for supplying water to said chamber, a pump for delivering heated water from said Y chamber, a turbine for driving said pumps, said housing provided with passageways to lead the exhaust steam from said turbine into said heating chamber, said pumps and turbine combined in a unit and mounted upon a single shaft.

10. In a feed water heating apparatus, a heating chamber, a pump for supplying water to said chamber, a pump for delivering heated water from said chamber, a turbine for driving said pumps, said heating apparatus provided with passageways to lead the exhaust steam from said turbine into said heating chamber, said pumps and turbines combined in a unit mounted upon a single water from said chamber, a turbine for oper-l ating said pumps, said heating apparatus provlded with passageways to lead the exhaust steam from said turbine into said heating Y chamber.

l2. In a feed waterheating apparatus, a

heating-chamber, a pump for supplying Water to said chamber, an excess Water pump for taking excess Water from said chamber, said supply pump and excess water pump having a common discharge.

13. In a feed Water heating apparatus, a heating chamber, a rotary pump for supplying water to said chamber,y an excess Water pump for taking excess water from said chamber, said supply pump and excess water pump having a common discharge, aturbine for operating said pumps, said heating apparatus provided with passageways for delivering exhaust steam from said turbine to said heating chamber.

i4. In a feed water heating apparatus, a heating chamber, a rotary pump for supplying Water to said chamber, an excess WaterA pump for taking excess Water from said chamer, said supply pump and excess Water pump having a common discharge, a turbine for operating said pumps, said heating apparatus provided with passageways for delivering exhaust steam from said turbine to said heating chamber, and a priming means controlled by water in the heating apparatus for priming said supply pump.

15. In a feed water heating apparatus, a

' heating chamber, a rotary pump for supplying water to said chamber, an excess Water pump for taking excess Water from said chamber, said supply pump and excess Water pump having a common discharge, and a check valve in the discharge of said umps to prevent backflow of Water from th eating apparatus into the pumps.

16. In a feed water heating apparatus, a heating chamber, a rotary pump for supplying water to said chamber, an excess Water pump for taking excess water from said chamber, said supply pump and excess Water pump having a common discharge, a check valve in thedischarge of said pumps to prevent backflow of water from the heating apparatus into the pumps, and a check valve in the connection between said excess water pump and heating chamber to prevent reverse flow of water into the heating chamber.

l?. In a feed water heating apparatus, a heating chamber, a. rotarypump for supplying water to said chamber, an excess water pump for taking excess Water from said chamber, said supply pump and excess Water pump having a common discharge, and a check valve in the delivery from the heating chamber to the excess Water pump to prevent reverse flow of Water into the heater.

18. In a'feed Water heating apparatus, a heating chamber, a rotary pump for supplying Water t0 said chamber, an excess water pump for taking excess Water from said chamber, said supply pump and excess water pump having a common discharge, and priming means controlled by the Water in the heating ap aratus for priming said supply pump.

19. n a feed water heating apparatus, a heating chamber, a rotary pump for supplying Water to said chamber, an excess Water "pump'for taking excess water from said chamber, said supply pump and excess Water pump having a common discharge, a turbine for operating said pumps, and means controlled by the Water in the heating apparatus for controlling the delivery of operating steam to said turbine.

20. In a feed Water heating apparatus, a housingpa heating chamber therein and having a steam inlet, means for delivering Water t said chamber for contact with said steam, and a rotary pump for delivering hot Water from said chamber, a turbine for driving said rotary pump, said heating apparatus having passageWays for delivering exhaust steam from said turbine to said heating chamber.

2l. In a feed Water heating apparatus, a b

heating chamber having a steam inlet, a spray valve for delivering water in sprays into said heating chamber for contact with the steam, a rotary pump for delivering hot Water from said chamber and means controlled by the Water in the heating apparatus for controlling operation of said pump.

22. In a feed water heating apparatus, a heating chamber, a pumping unit, an engine for operating said pumping unit and a condenser for condensing-the exhaust steam from said engine, said condenser delivering the condensate into said heating chamber.

28. In a feed Water heating apparatus, a heating chamber, a pumping unit, an engine for operating said pumping unit, a jet condenser, means for delivering a partof the supply Water from the pumping unit to said condenser, said condenser receiving the exhaust steamfrom said engine and having its discharge to said heating chamber, whereby the mingled supply Water and condensate will be delivered to said heating chamber.

2e. In a heating apparatus, a heating chamber, a cold Water supply pump, an operating engine therefor, a condenser receiving exhaust steam from said engine, said heating apparatus provided with a by-pass for diverting a part of the supply Water to said condenser.`

25. In a heating apparatus, a heating said condenser, said condenser having its discharge to said heating chamber.

26. In a heating apparatus, a heating chamber, a cold Water supply pump, a turbine for operating said supply pump, a condenser receiving exhaust from said turbine, said heating apparatus provided with a by-pass for diverting a part of the .supply Water to said condenser, said condenser having its discharge to said heating chamber, and a rotary pump for delivering heated Water from said heating chamber. f

27. In a v heating apparatus, a heating chamber, a Coldwater supply pump, a turbine for operating said supply pump, a condenser receiving exhaust from said turbine, said heating apparatus provided with a bypass for diverting a part of the supply Water to said condenser, said condenser having its discharge to said heating chamber, and means controlled by Water in the heating apparatus for controlling the supply of operating stea-mto said turbine.

28. In aheating apparatus, a heating chamber, a cold water supply pump, a turbine for operating said supply pump, a condenser receiving exhaust from said turbine, said heating apparatus provided with' a bypass for divertmg a part of the supply water to said condenser, said condenser having its discharge to said heating chamber, and primingmeans controlled by Water in' the heating apparatus-for priming said Coldwater sup- Ply Puma 29. In a feed water heating apparatus, a heating chamber, a cold water supply pump, a turbine for operating said pump, a condenser receiving exhaust steam from said turbine, said heating apparatus provided withA a by-pass for diverting a part vof the supply Water to said condenser, said condenser having its discharge to said heating chamber, a jet pump and means controlled by water in the heating apparatus for controlling` the operation of said jet pump to prime said supply pump, said means cutting off the delivery of steam to said jet pump and permitting delivery of operating steam to said turbine' upon the delivery of a predetermined quantity of Water into the heating apparatus.

30. In-a feed water heating apparatus, a cold Water supply pump, a jet pump for priming said cold Water supply pump, an engine for operating said pump and means controlled by water in the heating apparatus for permitting operation of saidjet pump 'and for cutting olf operation of the jet pump and permitting passage of operatin steam to the engine upon the delivery o a pre-` determined quantity of water to the heating apparatus. 4

31. In a feed water heating apparatus, a cold Water supply pump, a jet pump, an engine for operating said pump for priming said cold Water supply pump and means controlled by Water in the heating apparatus for permitting operation of said jet pump and for cutting oft' operation of the jetpump and permitting passage of operating steam to the engine upon thedelivery of a predetermined quantity of Water to the heating apparatus, and a rotary pump for delivering heated Water from said heated chamber.

32. In a feed water heating apparatus, a heating chamber, a centrifugal pump for supplying cold Water to the chamber, a return pump for taking excess water from the heating chamber, said return pump dis; charging into the discharge of said cold Water supplying pump whereby the discharging capacity of said cold Water supply pump will be regulated bythe quantity of excess water pumped from the heatmg chamber.

38. In a feed Water heating apparatus, a casting containing a heating chamber, attaching brackets on said casting to permit its attachment to a support, a second casting detachably connected to the bottom of said first casting and supported wholly by said first casting, a shaft carried by said second casting, a plurality of pumps mounted upon said shaft and a prime mover for operating said pumps mounted on said shaft.

34. In a feed water heatingapparatus', a casting containing a heating chamber, attaching brackets on said casting to permit its attachment' lto a support, a second casting detachably connected to the bottom. of said first casting and supported wholly by said first casting, a shaft carried by said second casting, a cold water supply pump mounted on said shaft, a return pump for drawing oil' excess-Water from the heatingchamber and returning it thereto mounted on said shaft, a` hot Water discharge pump mounted y on said shaft,.and a turbine for operating said pumps mounted on said shaft.

35. In a feed Water heating apparatus, a heating chamber, a pump for supplying Water to said chamber,'a jet pump for priming said supply pump, and means controlled by Water in the. heating apparatus for controlling operation of said Jet pump.'

from said turbine into said heating chamber. chamber to the discharge of the said pump 381 In a feed Water heating apparatus, a whereby thequantity of Water d1schargedby housing, a heating chamber therein, a cen- 'the pump will be reduced 1n accordance with trifugal pump for supplying water to said the excess water dellvered'to lts dlscharge.

5 chamber, a hot water pump for withdrawing ln testlmony whereof I aix my s1gnature. 70

hot Water from said chamber, steam actuated THOMAS C. MGBRIDE. means for operating said hot water pump, said housing provided with passage Ways to lead exhaust steam from said steam actuated u', means into said heating chamber. 75

39. In a feed .water heating'apparatus, a heating chamber, a pump for delivering Water to said chamber, said chamber having an inlet for steam, means for removing excess Water from said chamber, said means con- 80 nected to the discharge of said pump for delivering the excess Water into the pump dis` charge for return to the chamber.

40. In a feed Water heating apparatus, a

heating chamber, a ,pump for delivering e5 Water to said chamber, said chamber having an inlet for steam, means for removing excess' water from said chamber, said means connected to the discharge of said pump for delivering the excess Water into the pump dis- 90 charge for return to the chamber, and a check valve in the discharge of said pump to prevent back ow of water into the, pump.

41.`In a feed water heating apparatus, a

heating chamber, a centrifugal pump for sup- 95 plyingwater to said chamber, said chamber having an inlet for steam, means for remov ing excess water from said chamber, said means connected to the discharge of said centrifugal pump for delivering the excess Water 10 into the pump discharge for return to the chamber, a turbine for operating said pump, and means controlled by the Water in the heating apparatus for controlling the delivery of operating steam to said turbine. 105

42. In a feed vvater heating apparatus, a heating chamber having a steam inlet, a spray valve for delivering water in sprays f into said heating chamber for contact with the steam, a centrifugal pump for delivering 110 water to said spray valve, a turbine for operating said pump, and means controlled by cthe Water in the heatin apparatus for controlling the delivery ofg operating steam to said turbine. 115

43. In a feed water heating apparatus, a

heating chamber, means for spraying water into the heating chamber, -a pump for deliv- 5', ering water to said spraying means, and

quantity Iin said heating chamber will proportionately reduce the discharge of said pump. f"

o 44. In a feed water heating apparatus, a

12s heating chamber, means for spraying water into the heating chamber, a pump for delivering water to said `spraying, means, and means for delivering excess water above a .predetermined quantity in said heating 130 means whereby water above a predetermined y

Images