US2564583A - Deaerating feed-water heater - Google Patents

Description

14, 1951 J. F. SEBALD DEAERATING FEEDWATER HEATER 2 Sheets-Sheet 1 Filed Sept. 30, 1948 FIG.

INVENTOR.

JOSEPH F. SEBALD 1951 J. F. SEBALD I 2,564,583

DEAERATING FEEDWATER HEATER Filed Sept. 30, 1948 Sheets-Sheet 2 FIG.2

JOSEPH F'. SEBALD INVENTOR.

3 second chamber 3 wherein the pressure is reduced, resulting in a release of the non-condensible gases.

The steam enters the feedwater heater and degasifier through a steam inlet II into the enclosed conical space I6 formed between the baffies I and I and thus the steam and water are introduced into the mixing apparatus I3 in substantially parallel extending relationship and in a separated but thermal-heat-exchange relationship. The steam passes into the mixing apparatus I3 through the annular space I8 which surrounds the water inlet I2 and from the outlet of the annular space I8 enters the mixing passage where it is thoroughly mixed with the water and discharged into the second or degasifying chambeer 3. r

As clearly shown in Fig. 1 of the drawing, the uppermost portion of the space H formed between the perforated baiile I and the imperforate baffle I0 opens, as shown at I9, into the uppermost portion of the second chamber 3 and thus the residual steam and released non-condensible gases flow from the chamber 3 into the annular space II from whence some of the steam passes through the perforations 8 into the first chamber 2 while the major portion of the steam is directed to the central opening 9 in the perforated bafiie I. By directing the major portion of the steam to the central opening 9 the steam will serve to scrub the water flowing through the perforations 8 into the space II. From the opening 9 the residual steam and released noncondensible gases flow upwardly through the first chamber 2 towards the coldest part of the water being sprayed into the first chamber 2, that is, towards the spray valves 6 in a direction counter-current to the flow of the water sprayed into and through the first chamber 2. The spray valves 6 are so located and their spray pattern is so baffled by means of the centrally disposed annular baffle I9 and the upper baffle as to provide a restriction of the steam flowing toward the spray valves and to force the residual steam through the spray pattern of the incoming cold Water. The centrally disposed annular bafiie I9 encircles the cold water inlet pipe 4 for a portion of its length, as clearly shown in Figure 1 of the drawings, and it serves to assist in maintaining the desired water fiow pattern and to prevent steam from short-eircuiting across the chamber 2. The bafile I9 provides an enclosed downwardly opening space and it is provided with a plurality of perforations 2| near its closed top to permit the escape of any non-condensible gases which might enter the confined space within the baflie.

The upper substantially horizontal baffle 20 which is placed above the spray valves 6 so as to prevent upward fiow of the water is provided with a plurality of perforations 22 to permit the passage of released non-condensible gases and any small quantity of residual steam which is not condensed in the first chamber 2 to pass into the space in the top of the shell or housing I and from this space the released non-condensible gases and the non-condensed residual steam passes through openings 23 in the annular baflie 24 into the space 25. This prevents any pocketing of non-condensible gases in the space between the bafiie 20 and the top of the shell I. Released non-condensibles and remaining noncondensed vapor also pass through the sprays of water and into and through the space 25 around the spray head 5. The space 25 is formed at the top of the shell I and is opened to atmosphere through an atmospheric vent 26 which permits the escape of the released non-condensible gases together with any residual steam which is noncondensed in the first space 2, to atmosphere.

By the arrangement of the spray nozzles and the various baiiies to provide the above described fiow paths of the incoming cold water and the residual steam practically all of the residual steam will be condensed within the shell I of the heater and the use of vent condensers as above referred to in connection with the various patents itemized will be eliminated, thereby materially reducing the weight of the ieedwater heating and degasifying apparatus, as well as reducing its cost without sacrificing any of the advantages.

In the claims, as in the foregoing specification .the term residual steam is used to designate the steam which is not'condensed by its direct heat exchange and degasifying contact with the water in the second or low pressure chamber 3 of the apparatus.

It will be understood that the invention is not to be limited to the specific construction or arrangement of parts shown, but that they may be widely modified within the invention defined by the claims.

What is claimed is:

1. In a water heating and degasifying apparatus, a housing, a pair of operably connectedfirst stage and second stage treatment chambers in said housing, means for introducing water to be heated and degasified into said first stage chamber including a spray head and a plurality of spray nozzles carried thereby, arranged to spray the incoming water into said first stage treatment chamber in downwardly diverging substantially conical fiow patterns composed of broken up diverging fine streams, second means for introducing steam into said second stage chamber, means for introducing water from said first stage chamber into said second stage chamber including an inverted substantially frustrooonicai baflie, means operably associated with both of said second means and said water introducing means for directing water and steam being introduced into said second chamber into direct heat exchange and degasifying relationship with respect to each other, an inclined inverted frustroconical baflle carried within said housing and extending across the upper end of said second stage chamber in spaced relation to the inverted baflie of said water introducing means to provide a transverse passage for non-condensible gases and residual steam from said second stage chamber into said first stage chamber, said inclined baffle having an opening in its lowermost portion opening upwardly into said first stage chamber to direct steam into the first stage chamber in countercurrent direction to the sprayed water and a substantially frustroconical baffle in said first stage chamber and located substantially centrally of the downwardly diverging conical flow pattern of the incoming water.

2. A water heating and degasifying apparatus as claimed in claim 1 wherein said shell has an accumulation space for non-condensible gases and non-condensed vapor therein said space being located about and above said spray head, and

a vent in said accumulation space to vent thev non-condensible gases and residual steam to ats h r said spray nozzles 5, 3. A water heating-and 'degasify'ing apparatus as claimedin claim 1 wherein said shell has an accumulation space for non-condensible gases and non-condensed vapor therein said space being located about and above said spray head, a vent in said accumulation space to vent the noncondensible gases and residual steam to atmosphere, an inclined baffle in said housing extending into said first stage chamber in spaced relation to said second water introducing means to provide a prolonged inlet passage for incoming residual steam and non-condensible gases;

4. A water heating and degasifying apparatus as claimed in claim 1 wherein said shell has an accumulation space for non-condensible gases and non-condensed vapor therein said space being located about and above said spray head, and a vent in said accumulation space to vent the non-condensible gases and residual steam to atmosphere, a bafiie about the inlet to said accumulation space to prevent by-passing of residual steam and non-condensible gases to said accumulation space, said baffle provided with perforations to prevent pocketing of non-condensibles in the space between the baifie and shell.

5. In a water heating and degasifying apparatus, a housing, a pair of operably connected stage treatment chambers in said housing, means for introducing water to be heated and degasified into the first of said chambers, means for introducing steam into the second of said chambers, means for introducing water from said first chamber into said second chamber, means for directing water and steam being introduced into said second chamber into a direct heat exchange and degasifying relationship with respect to each other, said means for introducing water from said first chamber into said second chamber comprising upper and lower parallel baffles forming an annular space between them which is open at its perimeter to said second chamber to permit residual steam and released gases to pass from the second chamber into the first chamber, said baflies being provided with openings at their centers to allow Water to pass from the first chamber to the second chamber, said uppermost of said parallel baiiies being provided with a plurality of perforations to permit water and some residual steam to pass therethrough in countercurrent directions.

6. Water heating and degasifying apparatus as claimed in claim 5 wherein the central opening in said upper bairie is relatively large to permit the major portion of the steam to pass into the first chamber through said large central opening and effect a scrubbing action on such matter as passes through said perforations.

7. In a water heating and degasifying apparatus, a housing, a pair of operably connected stage treatment chambers in said housing, a Pinrality of spray valves for spray water into the first of said chambers, means for introducing steam into the second of said chambers, means for introducing water from said first chamber into said second chamber, both of said means being arranged to maintain the water and steam in a separated but thermal heat exchange relationship, means operably associated with said steam and water introducing means for directing water and steam being introduced into said second chamber into a direct heat exchange and degasifying relationship with respect to each other, means for delivering residual steam from said second chamber to said first chamber, said water introducing means and said residual steam delivering means so constructed and arranged that the residual steam entering the first chamber will flow towards the cold water in a countercurrent direction with respect to the flow path of the water in said chamber, baffles in said first chamber, said spray valves and said bafiles being arranged so as to provide a restriction to the fiow of residual steam flowing through said first chamber, said means for introducing water from said first chamber into said second chamber comprising upper and lower parallel bafiies forming an annular space between them which is open at its perimeter to said second chamber to permit residual steam and released gases to pass from the second chamber into the first chamber, said upper bafiie being provided with a plurality of perforations to permit water and some steam to pass therethrough in countercurrent direction.

8. In a water heating and degasifying apparatus, a housing, a pair of operably connected stage treatment chambers in said housing, a plurality of spray valves for spraying water into the first of said chambers, means for introducing steam into the second of said chambers, means for introducing water from said first chamber into said second chamber, both of said means being arranged to maintain the water and steam in a separated but thermal heat exchange relationship, means operably associated with said; steam and water introducing means for direct-- ing water and steam being introduced into said. second chamber into a direct heat exchange and degasifying relationship with respect to each. other, means for delivering residual steam from said second chamber to said first chamber, said: water introducing means and said residual steam delivering means so constructed and arranged. that the residual steam entering the first cham-- ber will flow towards the cold water in a countercurrent direction with respect to the flow path of water in said chamber, bafiles in said first chamber, said spray valves and said baflies being arranged so as to provide a restriction to the flow of residual steam flowing through said first chamber, said means for introducing water from said first chamber into said second chamber comprising upper and lower parallel baflies forming an annular space between them which is open at its perimeter to said second chamber to permit residual steam and released gases to pass from the second chamber into the first chamber, said upper bafile provided with a relatively large opening at its center for the passage of residual steam therethrough into the first chamber.

9. In a water heating and degasifying apparatus, a housing, a pair of operably connected first stage and second stage treatment chambers in said housing, means for introducing water to be heated and degasified into said first stage chamber including a spray head and a plurality of spray valves carried thereby, said spray valves arranged to spray the incoming water into said first stage treatment chamber in downwardly diverging substantiaily conical flow patterns composed of broken-up diverging fine streams, means for introducing steam into said second stage chamber, means for introducing steam from said second stage chamber into said first stage chamber including a baffle having a centrally disposed opening for directing steam into the first stage chamber in countercurrent flow direction to the flow direction of the incoming sprayed water, and a centrally disposed annular baflie in said first stage chamber substantially in line with said opening to provide a restriction for steam flowin towards said spray valves and to force the major part of such steam through the sprays of water, a substantially horizontal baflle in said housin above said spray valves to prevent upward flow of incoming water, said substantially horizontal baffle having an annular extension baflle connected thereto and forming a confined non-condensible collection space above said spray head, said annular baflle provided with openings to permit passage of non-condensibles into said collection space, and said housing provided with a vent opening into said collection space.

JOSEPH F. SEBALD.

.REFERENCES CITED UNITED STATES PATENTS Number Name 7 Date 695,320 Matthews Mar. 11, 1902 899,063 Mueller Sept. 22, 1908 1,792,164 Holland Feb. 10, 1931 2,308,721 Sebald Jan. 19, 1943 2,344,554 McDermet Mar. 21, 1944 Rohlin Mar. 28, 1944

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