US2345217A - Atomizing deaerator - Google Patents

Description

March 28, 1944. V` A ROHLlN' 2,345,217

ATOMI Z ING DEAERATOR File June 1l, 1942 BY g. 1M

1 ATTORNEY Patented Mar. 28, 1944 2,345,217 ATOMIZING DEAERATQR victor A. Rohan, Philadelphia, ra.,as1gpgr to Cochrane Corporation, Philadelphia, Pa., a corporation of Pennsylvania Ammann June 11, 1942, :serial 446,623 3 Claims. ('Cl. 18S-2:5)

Ihe general object ofthe present invention is to provide a water vheating and deaerating device with improved means for moving condensate into the device from its associated vent condenser. More specifically, the object lof the present invention is to provide a two stage atomizing deaerator .of any :of the types new in use, with means for utilizing available energy in the steam to move condensate into the deaerator from its vent condenser when the water level in the condensing space of the vent condenser A is not high enough for the gravitational passage of the condensate into the atomizing Zone of the deaerator. I

The need for the present invention is primarily due to the pressure conditions existing -in two stage atomizing deaerators, and to the' characteristic compactness of design of such deaerators. Those deaerators have found their principal eld :of use in marine service, wherein the avoidance of unnecessary bulk and head room is highly desirable. This has ledy to the'extension of the vent condenser through the side wall of the deaerator tank into the upper initial water heating section of the deaerator, into which the condenser drains so that the condensate may pass from the said section into the atomizing zone along with the water sprayed into and initially heated in said upper section of the deaerator., With such an arrangement under heavy load conditions the water may accumulate in the upper water heating section, to the level of the bottom of the condenser, with the result that the available water head is then `insufficient to move condensate out of the con-r densing space of the condenser at the proper rate. Y

To provide the energy needed to atomize the water the steam used must have its pressurev reduced one pound or so atfull load, as the steam passes from the supply pipe into the deaerating space. To move t'ne steam from the deaerating` section into the primary heating section of the deaerator, and frcm.-the last mentioned section into the condensing space of the vent condenser, requires a reduction in the pressure of the steam which in operation at rated capacity, may amount yt9 a water head of sin or eight inches. The last mentioned pressure loss increases-in proportion to the square of the load, and an atomizing deaerator may be operated from time to time with a load which is loi) per cent greater than the rated capacity or nominall full load of the deaerator.

Some water .head fis also needed to Overcome the -rctcnal resistance to the rapid movement loi the condensate through the condensate discharge Ypipe the condenser, required under lheavy .load conditions.

In accordance with the present invention, proper movement of uthe condensate into the deaerator from the vent condenser is insured by utilizing some of Ithe energy of the ,steam supplied to the deaerator in producing the desired condensate movement.

In -a simple form ci the present invention I provide the vent condenser with a drainage discharge pipe terminating :in an outlet so disposed relative to -ther'path ofthe atomizing jet oi steam discharged into the deaerating section of the deaerator, that Ithe steam will subject the drainage outlet to an ,aspirating or suction eiect. In some cases, however, i1 ,may provide a steam lift or ejector device at Athe drainage end of the drainage pipe, and pass a small portion of the steam supplied to the deaerator directly into said device for impelling fluid use therein.

The present 'invention is well adapted for use in atomizing deaerators of the so called xed orifice type, as well as 4in atomizing deaerators of the type in which the steamvis discharged into the deaerating space by an atomizing valve .loaded to maintain a denite difference between Vthe pressure in the steam .supply pipe and in the deaerating space.

4The various features of novelty which charaeterize'my invention are pointed out with par- .ticularity inthe claims annexed to and forming a'part of this specification. For a better understanding of the invention, `however, its advantages, and'specifie objects attained with its use, reference should be had to the accompanying drawing and descriptive matter in which I have illustrated and described preferred embodiments of the invention.

0f the drawing:

Fig. 1 is a somewhat diagrammatic elevation Aof an atomizing deaerator including a loadedY atomizing valve;

Fig. 2 is an elevation taken similarly to Fig. 1, and showing yan atomzing deaerator of the fixed orifice type; and

Fig. 3 illustrates the use of a drainage discharge device of the steam lift of the ejector type.

The deaerator A shown somewhat diagrammatically -in Fig. l, is of a type which is now in extensive 4use on steamships, and which is also passage of steam from the deaerating spaceB` 1 into the initial water heating space C. The water treated in the apparatus is sprayed into the upper portion of the space C by spraying means F, to which Water is supplied under suitv.

able pressure through the tubes G of a vent condenser G having a water inlet, G2 and having l a condensing space G3.

The air and gases separated from the water y' I in the spaces B and C pass from the latter along with some steam into the condensing space G3 through a port G4. Much of the steam in theA mixture entering the condensing space 'G3 4vis condensed therein, and

of said mixture is discharged through an" outlet G5. The outlet G5 may open directly into the atmosphere when the normal pressureV Vinfthe condenser is not less than the pressure of the atmosphere, and may be connected to a vacuum l pump when the pressure in the space C is'subatmospheric. A drainage pipe G6 serves to pass condensate forming in the condensing space G3 into the deaerating space B.

The steam used in heating and deaerating the Water treated is supplied by a pipe H, which customarily extends, as shown, horizontally through the shell of the deaerator into the central portion cf the space C, and comprises a depending discharge end portion H'. The latter is'smaller in diameter than, and extends coaxially down through the spout D', thereby providing an annular passage for the downflow of the water from the space C into the space B.

The atomizer shown in Fig. 1 is of the loaded valve type, and the lower end edge of the pipe portion H1 forms a horizontal valve seat, towards which a subjacent vertically movable valve member I is biased by means shown as comprising a horizontal rock shaft I extending through the wall of the tank and having its inner end link connected to the valve member I and having its outer end connected -to a suitable spring or weight loading means which need not be illus- 5 trated Vand described, as they are well known,

one form being illustrated, for example, in Pati ent 1,943,890, granted January 16, 1934, onv an application tiled by George H. Gibson and-me.;

as joint inventors.

With the atomizing valve I and' its seat H formed and disposed in the general manner illustrated in Fig. 1, steam is discharged in the form of a. hollow conical jet/moving upwardly the uncondensed residue fixed oriiice type. which differs from the de- Y aerator of Fig. 1, essentially, and as shown, only in that the valve I of Fig. 1 is replaced in Fig. 2 by a similarly shaped member H5, which is spaced a iixed distance away from the lower edge of the steam pipe portion H'. As shown in Fig. 2 the pipe portion H' is provided at its lower end with an uprising conical flange or baille portion H6, spaced away from the uprising conical outer portion of the part H5, and curved .vanes H7 are placed between the parts H5 and H5, to provide channels leading from the bore of the pipe H to the periphery of the part H6 and curved to elTect tangential discharge of the water.

vIn operation under normal load conditions,

"the pressure drop between the steam pipe H 'and the deaerating space B of the deaerator AB is about the same in the xed orifice deaerator AB-.vin the deaerator A of Fig. 1. When the load is high enough to make its condensate moving effect desirable the drainage pipe outlet G" will be subjected to substantially the same drainage moving effect in apparatus of the type shown in f Fig. 2, as in apparatus of the type shown in"- Fig. l

In Fig. 3 I have illustrated a form of the invention differing from those shown in Figs. l' and 2, in that the condensate drainage pipe Gs is provided at its discharge end with an ejector G10 including an axial nozzle H1o receiving steam from the pipe H through a branch H9, and disand outwardly from the valve axis, and in accordance with the present invention Athe ldischarge end G7 of the condenser drainage pipe G6 is disposed adjacent the discharge edgeof the valve, so that the jet of steamV discharged will impress a substantial suction or aspirating eiect on the drainage pipe.

I customarily maintains to insure the desired Y Water atomizing effect, the aspirating action of the steam jet on the drainage pipe G6 may' amount to a Water head of a foot or more.

With the steamA pressure drop of a pound or so whichthe valve @unavailable for atomization charging the steam in a jet coaxial with and directed toward the discharge tor G10.

As those skilled in the art will understand,` the ejector G10 may be so shaped to act as a steam jet ejector or exhauster, or to act as a steam lift pumping device. In either case, effective use is made of the steam diverted from the atomizing jet through the pipe H9, and in Fig. 3 the device G10 takes full advantage of the difference between the pressure in the pipe H and the pressure inthe deaerating space B.

'I'he deaerator AC shown in Fig. 3 is like the deaerator AB shown in Fig. 2, in having a fixed orifice, but the device Gr1o shown in Fig. 3 may be used equally Well in a deaerator of the loaded valve type shown in Fig. 1.

While the use of the present invention theo-` retically reduces the amount of atomizing energy available from a given amount of steam sup- 1 plied to a deaerator operating under given pressure conditions, the amount of energy thus made purposes, is relatively small and inconsequential.

use in heating the Water passing through the apparatus, will be the samelfor the steam discharged into the space B of Fig. 3 through the condensate discharger G10, as for the steam discharged through the fixed orifice between the parts A and A6.

While in accordance with the provisions of the pended claims and that in some cases certain features of my invention may be used to advantage without a corresponding use of other fea- ;tures.

outlet G of the ejecl Moreover, the heat units per pound of steam which are available ,for l Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. An atomizing deaerator comprising a water heating section, a deaerating section in communication with said heating section to receive water therefrom and to discharge steam thereinto, a vent condenser having a condensing space in communication with said heating space to receive a steam and gaseous mixture therefrom and having an outlet for the discharge of uncondensed residue, means for supplying Water to be heated and deaerated to said heating section, conduit means for passing water from said heating section into said deaerating section, a water of condensate discharge connection to said vent condenser havingits discharge end in a portion of said deaeratingsection displaced from said conduit means, means for discharging heated and deaerated water from said deaerating section, means supplying steam to said deaerator at a pressure above the steam pressure in said deaerating section and means for utilizing a portion of the energy of the steam supplied in atomizing the water passing into the deaerating section from the heating section and for utilizing another portion of the energy of the steam supplied in moving a jet of steam past the discharge edge of said discharge connection and thereby impressing a suction on said discharge connection and atomizing the condensate discharged.

2. An atomizing deaerator comprising a Water heating section, a deaerating section in communication with said heating section to receive water therefrom and to discharge steam thereinto, a vent condenser having a condensing space in communication with said heating space to receive a steam and gaseous mixture therefrom and having an outlet for the discharge of uncondensed residue, means for supplying water to be heated and deaerated to said heating section, conduit means for passing Water from said heating section into said deaerating section, a water of condensate discharge connection to said vent condenser having its discharge end in a portion of said deaerating section displaced from said conduit means, means for discharging heated and deaerated water from said deaerating section, and means supplying steam to said deaerating section in the form of a jet atomizing the water received in said section and impressing a suction on the discharge end of said condensate discharge connection and atomizing the condensate discharged.

3. An atomizing deaerator comprising a Water heating section, a deaerating section in communication with said heating section to receive Water therefrom and to discharge steam thereinto, a vent condenser having a condensing space in communication with said heating space to receive a steam and gaseous mixture from the latter and having an outlet for the discharge of uncondensed residue and having a Water of condensate discharge connection with its discharge end in said deaerating section, means for supplying Water to be heated and deaerated to said heating section, means for discharging heated and deaerated Water from said deaerating section, means supplying steam to said deaerator comprising a supply conduit, an orifice through which an atomizing jet of steam is discharged into said deaerating section from said conduit and means connected to said conduit and actuated by steam received from said conduit to impress a suction on the discharge end of said condensate discharge connection and to atomize the condensate discharged.

VICTOR A. ROHLIN.

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