US2011600A - Feeding water to boilers - Google Patents

Description

ug. 20, 1935. v. v. VEENSCHOTEN FEEDING WATER TO BOILERS Filed Oct. 30, 1953 s Sheets-Sheet 1 Aug. 20, 1935. v. v. VEENSCHOTEN 2,011,600

FEEDING WATER TO BOILERS Filed Oct. 30, 1933 5 Sheets-Sheet 2 Aug. 29, 1935. v. v. VEENSCHOTEN 2,011,600

FEEDING WATER o BOILERS vFiled Oct. 30, 1933 5 Sheets-Sheet 3 Aug. 20, 1935. i v. v. VEENSCHOTEN 2,011,600

FEEDING WATER T0 BOILERS Filed Oct. 30, 19:3 5 Sheets-Sheet 4 Aug. 20, 1935. v. VEENSCHQTEN 2,011,600

FEEDING WATER TO BOILERS Filed Oct. 30, 1933 5 Sheets-Sheet 5 stares PATENT or-Flcs FEEDING WATER- T0 BOILERS VincentV. Veenschoten, Erie, Pa., assignor to Northern Equipment Company, Erie, Pa., a corporation of Pennsylvania Application October 30, 1933, Serial No. 695,726

21 Claims.

This invention relates to the feeding of water to boilers and has for its object providing a suitable method of feeding water to the boilerswhen it is desired to mix therewith a chemical for precipitating or other purposes, and also iorpro- .viding: suitable apparatus for carrying out the method.

In boiler operation, as is well understood, the

continual evaporation of water in the boiler increases the' concentration of soluble and insoluble matter in the water which produces deposits of scale, foaming and priming and caustic embrittlement, and not only necessitates frequent blowing down of the water but is otherwise objectionable. It has been the practice to introduce with the feed water certain chemicals, such as sodium phosphate, usually in solution, to assist in keeping the boiler surface clean. It is also common to pass into the boiler the condensate provided by the condensation of the steam .used for various purposes, or to introduce water without objectionable chemicals therein, in addition to raw water which is provided to make up the deficiency! In any case, it is usually desirable, when introducing the sodium phosphate, to proportion it to the amount of impurities that go in with the feed water rather than in proportion to the total amount of water. Herein, for convenience, I shall refer tothepure water that is introduced as the condensate, and to the impure water as the make-up, and to the liquid which contains the chemical, such as sodium phosphate, as the treatment.

One object of my invention is to provide for supplying to the boiler the treatment in proportion to the make-up, without any reference to the proportion of the make-up to the condensate, it being understood that, in practice, the proportion of the make-up to the condensate varies greatly from time to time, even with the same boiler load.

Of the accompanying drawings, Fig. 1 is a more or less diagrammatic elevation of a boiler system and the means therefor which supply liquids thereto, according to my invention; Fig.

2 is an enlarged plan view of the proportioni'ng valves of Fig. I; Fig. 3 is a sectional view along the line 33 of Fig. 2; Fig. 4 is asectional view along the line 4',' of Fig. 2; Fig. 5 is a diagrammatic elevation oita modified form of apparatus; Fig.6 shows a modification of the system illustrated by Fig. 5; Fig.7 illustrates a further modification; and Figs; 8 and 9 illustrate by enlarged 'drawingsthe proportioning valves of Fig. 7.;

Referring to Figl, the upper portion of the figure represents a battery of boilers in, which are being supplied with treated water through the pipes H, by means of the feed water valves E2, the opening of the valves being controlled by any of the ordinary feed water regulators, such as the thermostats l3. The water is supplied to each boiler through a main M, by means of a pump !5, which draws the treated water from a storage tank I 6.

In this instance, the water consists of the condensate, the make-up water, and the treatment. I'he latter we may consider as a suitable chemical for suitably treating the water in the boilers. The condensate is passed directly into the storage tank IS, in any suitable manner, such as by means of a pipe I l. The make-up water is passed into the tank through a pipe l8, andthe treatment is passed into the tank through a pipe 20. The valve 22 is adapted to control the flow of make-up water into the pipe I8 from any suitable source of supply under pressure through a pipe 23. The valve 24 controls the flow of the treatment from a suitable tank 25 through a pipe 26.

In order to maintain constantly the predetermined relation between the mass of make-up water and treatment, the valves 22 and 24 are operated synchronously and proportionately by common operating means. These means comprise a float 21 mounted in the storage tank l6 and adapted to operate an external arm 28 in an ordinary manner. This arm controls an arm 30, which is arranged to operate simultaneously the plungers- 34 and 35 of the valves 22 and 2 4.

Referring to Figs. 2, 3 and 4, it will be seen that the. valves 22 and 24 are associated by means of a spindle 3|. Each end of the spindle is arranged to pass into one of the valve casings and is operatively fixed to an arm 32 or 33 therein,

and these arms are arranged respectively to opthe tank will be decreased proportionately, if a properly arranged, as the two valves will be closed proportionately the same amount.

As a consequence of this arrangement, the proportionate amounts of treatment and makeup liquids willremain constant,without 'referthe water in the tank i6 will rise sufficiently to entirely close the valves'22 and 2'3, but if, at any time, the condensate is not suif cientfor the a needs, these valves will be opened-more or less to meet, the needs of the boiler. ,But in any, such case, the proportionate amount 46f liquid passed through the valves willremain unchanged.

inlet and outlet.

will vary, changing the pressure in'the inletiof thevalve accordingly. Orfas is"well"understoo'd.

the pressure of the make-up liquid in the pipe 23' may be, varied, or the pressure in the tank 16 may be varied, depending upon; various circu'm. stancesk. T

gI-Ience, to insure v a proportionate: amount of how through" these valves; irrespective of: variationsin theinlet or outlet pressures,1I provide means for maintaining a constant drop inpresmeans is old.- But I prefer forithe purpose the use ofa sylphon bellows iil mountedin the casing of the valveLEZand operatively connected i-with the'o'utl'et of the valve and'with the inner chamber I H; and 1 also operatively connected with the plunger 42, which controls'the flow of liquid i from the pipe 23 into the chamber 4|. As is well 'u'nderstood, this arrangement is such that 'a' constant drop in pressure through: the plunger 34 will be maintainedand, hence, the-flow of watertherethrough will beproportionalto the magnitude of the o-peningof thevalve; Similarly with valve 24. The sylphon bellows 43 "maintains aconstant drop in pressure through the plunger 35, so that the flow of treatment is'al ways'proportional to the opening of the ports therethrough. i Y

While my invention has no particular relation to'the chemicalthat may be used for properly affecting the chemicals in the make-up-water,

I yetit is customary for such purposes to use sodium phosphate, and the introduction of this substance into the make-up water as herein de-' scribed tends to form a coat on the inner surface of the'pipes l9 and lt-throughwhich the liquid passes on its way to theboiler; 'Ihis tendency'to lime up thepip'e's is to be avoided, if pos- I sible,-{and to accomplish this, when sodiu'mph'os phate' or, similar chemicals are used in the q treatment; I'provide a somewhatmodified system,"which is illustrated in'Figfi. "This system isadapted to pass the treatment which may be necessary directly into each of the boilers of the "battery substantially in proportion to the amount of make'upliquid that is: passed in that particu lar-boilen-but to entirely preventany mixing" of thetwo liquids before the boiler is-reachedb I The system'which I provide for this purpose is similar to thatof Fig. 1, except that the pipe 2!] is replacedby'a pipe 50 which passes the treatment from the'proportiohing valve's'into atank 58', instead :of into the storagetank 52which corresponds to thetanklfi of the other system. This treatment is then "forcedyby means of a pump 53, through a pipe 54 to:a main treatment pipe-:55.l'i Themake up liquid passes ,into thetank forced, by. means of a pump through a pipe '58 into the main pipe 60. The pumps 53 and 51 may. be operated by any suitable means. As

shown, they are operated by steam, but the pump 53, for. instance, may be, operated by an electric motor, the controller of which is re- 7 'sponsive to the liquid level in the tank 5|. However, the amount of liquid passing through. 1 either valve is not necessarily proportional "to the opening of the valve, as'the amounts flowing f will'depend also upon the pressures in the valve, Obviously; asthe amount of treatment inv the tank 25 varies, the head thereof In this manner, the make-up and the treatand 52 are always substantially proportional as before, irrespective of the condensate that is passed into the tank 52. It will be understood that the proportioning of the treatment to the boilers or to the tanks may be regulated in various 'mannersysuchas by adjusting the pressuremaintainedby the pressure regulating valves on the treatment lines. I

Inthe branches 6i and 62 are valves 63,.which may be similar to thevalvesEZ and 24, except the boilers lilliquid in proportion to the needs,

in an ordinary manner. The only difference is that there are two pipes 66 and 51 feeding the boiler instead of one, and in each of the pipes is avalve corresponding to the valves 22 and 26.

These valves, however, may be any suitable constant pressure drop valves, such asthe valves of Figs.8and9.'

" It will thus be seen that, mymeansof the valves 22 and 24, in this system the treatment issupplied to the tank 5i in proportion to the 'supplyof the make-up liquid to the taank 52, entirely irrespective of the condensate which is supplied through the pipe 56 in any ordinary manner. At the same time, the two liquids are properly 'distributed tojthe, individual boilers of the battery as thev valves. "open always Proportional; This, however, does not mean that these two valves will pass. proportional amounts of liquid. If such were the case, the amount of 'inent are properly proportioned as before, by means of the valves 22 and 24 operated in the manner'already described, by the float 2'5 in the tank 52, So that the amount of the two liquids 1 whichf'are delivered to the respective tanks El treatmentwould'be proportional to the combined amounts of ..make-up. and condensates The pump 53 being controlled by the elevation of the liquid level in the tank 5 l ,the pressure in the pipe 62 is 'variedacc'ordingly, For :"i'nstanc'e, if the system ,is beingefully supplied by the condensate,- althoughithe'valve in-pipe 62 will be open in the same proportion as the valvein pipe G Lyet there will be no fiow therethrough, as the ValvesBSsupplying steam tothe, pump 53 will be closed by the float 59. Or, in any event, the flow of treatment through the pipe .62 will be proportional to the pressure delivered-by the pump 53, and this in turn will be proportional to the makeupliquid'supplied to the tank 52.

f I have found that it is unnecessary to provide, at. least in .somecases, the treatment tank 5|.

This'may be eliminatedby passing the steam for rectly tromthe: tank25 to the pipe 62 and hence, is delivered to that pipe always-in proportion to aonhoo the-amount of make-pp. liquid. This system is illustratedin Fig- 6.-

1. This systemcomprises the valves '10 and H, whiclrf'mayibe in all respects similar to the valves 22,. and 2G hereinabovedescribed. The make-up water is passed through the'pipe 12 and the valve 'tank [3 through .the' pipe 8!.

i thispump pumps. themixed water fromthe tank into the.- main. pipe 84. p .The remainder of the system haswnot'been: il-

' lustrated, as itmay be in all respects similar through the pipe I83 as .tothe system. illustrated in Fig.3 5; The, treatment and the mixed liquids pass from the main pipes through suitable valves, such as the valves 22 and, 2.4, into the. respective boilers, these valves being controlled bythe feed water regulator as hereinabove described.

. With; this arrangement, the supply of treatment will always be proportional to the supply of make-up, just as with the other systems, irre-v spectiverof the amount of condensate supplied. Ifithe condensate alone is suffi'cient to supply the needs-oh the boilers, the valves. 79 and H will close andno treatment will be supplied by the pump it. As the valves 75 and H open, in case of.;insumcient condensate, the amount of treatment .passedb-y the. pump 75 will always 'be proportional. to the make-up passed intothetank 13...

Figs. 7 to 9- illustrate'a system somewhat similarv to that shown in Fig. 5.. In, this case,'however, the method of providing constant pressure drop through the valves corresponding to valves 22 and 2 5 is materially diiiferent... To accomplish I provide constant liquid heads above the valves, For this purpose,I provide tanks 95 and 91 which, by means of floats 92 and 93, maintain at, a, constant elevation thelevel of. the liquid therein. These vfioatseontrol valves 94 and 95, which control the flow of. make-up liquid through 'thepipe iifiandatreatment through the pipe 91.

Fromthesetanks, themakeup flows through the pipe 98 and valve 99=-to thesto-rage tank I66, and the treatment flows through the pipe NH and valve. 02 to'thegtank' N33. The" valves 99 and H32 are operated by the float substantially as described with reference to the valves 22 and 24, so that these valves open simultaneously and proportionally at all times and, hence, pass proportional amounts of liquids therethrough. The pumps I04 and H25 pass the liquids to the mains I06 and I91, as hereinabove described. The condensate may be passed to the storage tank with the system of Figs. 5 and 6. i

The valve system for passing the liquids from the mains to the boilers is in general the same as has been described with reference to Fig. 5.

But in this case I prefer to position the valves and to connect them up somewhat differently. The pipe H0 conveys the make-up liquid to the boiler through the valve l l l which is substantially the same as the valve 22 illustrated in Fig. 3. The valves H2 and H3 convey the treatment to the boiler through the pipe H4, and these valves are substantially the same as the valves 24 illustrated in Fig. 4. In each case, the valve systern provides a constant pressure drop therethrough.

Each feed Water regulator H5 operates the tively,

valve' lever H6 ma well known mannenland this lever operatessimultaneously and proportionally the plungers. H and H8 of the valves M l. and H3. This is accomplished by. means of the arms I23 and 24 and the adjustable connectboiler, the aggregate amount of water passed to i the boiler will be substantially proportional to the load on the boiler. However, any ordinary or suitable means for regulating the flow directly responsive' to. the load itself could be introduced in these systems, as is done in otherfeed water systems: 1

It maybe desired to feed the treatment to the boilers in proportion to the total amount of water fed thereto. This may be accomplished in case of the system of Fig. '7 by passing the condensate into the tank 98, by means of the pipe 20.. Byclosing the valve iii and opening the valve I22, andwith a suitable source of supply of condensate, the condensate would pass into the tank an instead ofthe tank 480 and, hence, the tank 90 would become a storage tank and the valves 99 and I02 would pass the treatmentproportional to the total amount of water which passed to the boiler. In case of Fig. 5, this same process would be carried out by passing the condensate together with the make-up liquid through the pipe 23, instead of passing the condensate through the pipe 56.

I claim as my invention:'

1. A boiler feed water system comprising three independent pipes for transmitting, respectively, a treatment, a make up, and acondensate liquid, a valve in each of the treatment and the make up pipes, a tank, means responsive to the liquid level elevationin the tank for operating simultaneously and proportionally said valves, each of the three pipes communicating with the tank, andmeans for forcing liquid from the tankinto the boiler.

2. A boilerfeed water system comprising three independent pipes for transmitting respectively, treatment, make up and condensate. liquids, a valve in each of two of the pipes, means for operating simultaneously and proportionally said valves, a tank, each of the three pipes communicating with the tank, and means for forcing liquid from the tank into the boiler, the said operating means comprising a float mounted in the tank and operatively associated with each of the valves.

3. A boiler feed water system comprising a first, a second and a third pipe for transmitting respec-' treatment, make up and condensate liq-1 uids, a valve in the first and the second pipes, a tank for containing liquids, the third pipe and second pipe communicating with the tank, means responsive to the liquid level elevation in the tank for operating said valves, means for passing liquid from the tank to the boiler, and means for passing a liquid from the outlet of the first valve to the boiler.

4. A boiler feed water system as claimed in claim 3, the latter means comprising a second tank, and a pump, and means responsive to the liquid level elevation l in the v second, tank. for passingliquid from the secondtank to the boiler.

1 513A boiler 'feed vwater'system asclaimed in claim '3, .each of said passing means comprisin'g a valve-and means responsive to the liquidlevelelevation in the, boiler forksir'nultaneously and proportionally operating the two' valves of the passing. means. i I 4' I s 6. "A boiler feed water. system as ciaimdrm 1 [boilerfor simultaneously and proportionally operating the two valves of the passingjmeans.

. 2 8.-'In a boiler gfeed water: system, meansfor claim 3 comprising means for producing. equal passing-into the boiler variable amounts'of a condensate' liquid, {and means for passing to. the

boiler proportionalamountsof mak'e-uptwater.

and a liquid treatment, said latter means .arranged to pass amounts of the make-up and the treatm'entinversely proportionalgto the amount 7 of condensate passed to the boiler.

9. Ina boiler system as claimed in claim 8, in'

which. said lattermeans comprises two pipes, a valve ,in each pipe, means for operating simul- 1 taneously and-proportionallysaidvalves, one of the-pipes being 'adapted'to transmit the make-up i water, and the other pipe adaptedtotran'smit the treatment." .7 10. In a boiler feed water system as claimed in claim 8, [said latter means comprising two valves and means for operating said valves simul--' taneously and 'proportional1y,uthe amount of make-up water and treatment passedto the boiler being;respectivelyresponsive to the opening of i the valves.

11. In a boiler feed water system a first," a

second,and ;a third pipe for transmitting, respectively, ;a, treatment, amake upyand a .condensate liquid, a valve inthe first and'in the second pipe, a tank for containing liquids, the secondand the third pipeadapted to pass liquids inthe tank,- means responsive to the, liquid level V in the tank for operating the two valves, means for passing liquid from the tank to the boiler,

. 1 and means responsive to the opening of thevalve I in the first pipe for passing a third liquid into the boiler.. u

. of make-up water passed thereto.

12. In a boiler feed. water. system as'claimed in claim 11, said latter means comprising a pipe for transmitting the third-liquid, a pump operatively connected tothe latter pipe,.apipe connecting the pumpwith the boiler, said first pipe 1 being connected to the pump .and'adapted to convey: a'power fluidvto said pump. f 13.;In a'boiler feed'water system, means for passing into the boiler variable'amounts of make-up water and means forgpassing' intothe boiler, .continuously and automatically, amounts of'a liquid treatment proportional to theaino-unts .14. Aiboilerieed water system'as claimediin claim 3, comprising two tanks mounted above the valves, the first and the second pipes :communi- 'cating with the: respective tanks, and means for passing arliquid 'intoeach of .the latter tanks;

' 15. A boilerfeed water system as claimedin liquidpressures at the inlets of the two 'valvesn 16. A boiler. feed water system. as claimed in claim 1, comprising means for providing. constant liquid pressuredrops througheach of the valves.

4 19. A method of feeding water to boilers consisting in passing to the boiler under: constant loadvariable amounts of condensate, in feeding to" the boiler at the same time aggregate amounts of makeup water and treatment inversely equal to the amount of change of condensate, and in feeding the treatment proportion to the amount-of make-up water.

20. A method of feeding water to a battery of boilers, consisting in passingto each of the boilers a mixture of make upand' condensate water, and in simultaneously passing to the boiler an-amount of treatment liquid proportional to the amount of make-up in the'mixture. I V

21.'A method of feeding water as claimed in claim 20, the treatment being passed to the'b'oiler independently of the mixture. i

VINCENT v.--vEENsoHoTEN.

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