Steam pressure reducing and conditioning valve

Information

  • Patent Grant
  • 6742773
  • Patent Number
    6,742,773
  • Date Filed
    Friday, January 4, 2002
    22 years ago
  • Date Issued
    Tuesday, June 1, 2004
    20 years ago
Abstract
A steam pressure reducing and conditioning valve for passing a superheated steam S inflowing from a first port 1 through a pressure reducing section 2, and, supplying subcooled water mist W and discharging desuperheated and depressurized steam S2 from a second port 3, wherein a first nozzle 4 for supplying mist W is provided in proximity to the pressure reducing section 2. The nozzle 4 injects subcooled water mist in a planar pattern r perpendicular to the flow of depressurized steam S1. Said first nozzle 4 is disposed such that there is a predetermined distance L between the jet pattern r of moisture W injected from the nozzle and the pressure reducing section 2.
Description




TECHNICAL FIELD OF THE INVENTION




The present invention concerns a steam pressure reducing and conditioning valve.




BACKGROUND OF THE INVENTION





FIG. 3

illustrates a first embodiment steam pressure reducing and conditioning valve (hereinafter “conditioning valve”)


130


wherein hot and high pressure steam S inflowing from a first port


131


is desuperheated and depressurized by passing through a pressure reducing section


132


having scattered small holes


132




a


, and transformed into a rapid annular flow steam S


1


. The steam S


1


is discharged from a second port


133


as desuperheated and depressurized steam S


2


by supplying the rapid annular flow vapor S


1


with subcooled water mist W in a body


136


.




As shown in

FIG. 4

, the subcooled water mist W is injected from a nozzle


134


, into a moisture jet section


135


, and the jet pattern of this subcooled water mist W is conical. The subcooled water mist W injected from nozzle


134


collides with the steam S


1


, to cool down the steam S


1


.




Referring again to

FIG. 3

, when the subcooled water mist W injected from the nozzle


134


comes into contact with the pressure reducing section


132


in a hot state, the pressure reducing section


132


may crack and break due to an extreme temperature change. To prevent the cracking, the subcooled water mist W from the nozzle


134


should not come into contact with the pressure reducing section


132


.




Consequently, in the prior art, the nozzle


134


is disposed remote from the pressure reducing section


132


so that the subcooled water mist W injected from the nozzle


134


will not come into contact with the pressure reducing section


132


, thereby increasing the size of the body


136


and necessarily resulting in enlargement of the whole valve.




The superheated steam S is cooled by colliding the rapid annular flowing steam S


1


with the subcooled water mist W, and further dispersing the droplets (mist) of subcooled water W.




However, when the nozzle


134


is disposed remote from the pressure reducing section


132


for the aforementioned reason, it is difficult to disperse (subdivide) the subcooled water as the velocity of the annular flowing steam decreases with the distance from the pressure reducing section


132


.











BRIEF DESCRIPTION OF THE DRAWINGS




The disclosed invention will be described with reference to the accompanying drawings, which show important sample embodiments of the invention and which are incorporated in the specification hereof by reference. A more complete understanding of the present invention may be had by reference to the following Detailed Description when taken in conjunction with the accompanying drawings, wherein:





FIG. 1

is a side view of a conditioning valve of the present invention having a portion of the valve cut away to illustrate a partial cross-section view;





FIG. 2

is a perspective view from above illustrating a lower portion of the valve body of the conditioning valve of

FIG. 1

;





FIG. 3

is a side view of a prior art conditioning valve having a portion of the valve cut away to illustrate a partial cross-section view; and





FIG. 4

is a perspective view from above illustrating a lower portion of the prior art valve of FIG.


3


.











DESCRIPTION OF SYMBOLS




L Distance




r Jet pattern




S Vapor




W Subcooled water mist (“moisture”)




SUMMARY OF THE INVENTION




The present invention comprises a conditioning valve


20


for passing a superheated steam S inflowing from a first port


1


through a pressure reducing section


2


, and supplying subcooled water mist W and discharging depressurized and desuperheated steam S


2


from a second port


3


. One or more nozzles


4


for subcooled water W are provided in proximity to said pressure reducing section


2


. A flat nozzle


4




a


injects subcooled water mist W in a planar pattern r. Nozzle


4


is configured so that there is a predetermined distance L between the jet pattern r of moisture W injected from flat nozzle


4




a


and the pressure reducing section


2


.




In one embodiment, vapor change valve


20


includes a pressure reducing section


2


with a bottom and a cylindrical shape. The subcooled water mist W jet pattern r is selected to be substantially parallel to the bottom of the pressure reducing section


2


.




It will be understood by those skilled in the art that one or more of nozzles


4


for injecting moisture W may be juxtaposed in several stages in the moisture jet section


5


of valve


20


. The nozzle


4


disposed in the position nearest to the pressure reducing section


2


is a flat nozzle


4




a


. Other nozzles


4


disposed further away from the pressure reducing section


2


may have jet patterns of either planar or conical shape.




In the present invention, a superheated steam S can be cooled more efficiently than the prior art, by adopting a flat nozzle


4




a


having the subcooled water mist W jet pattern r planar.




To be more specific, the nozzle


4


can be placed as nearest as possible to the pressure reducing section


2


by adopting a flat nozzle


4




a


with a planar jet pattern, and setting the plane direction of the subcooled water mist W to be injected in a direction perpendicular to the steam S


1


flow direction, and thus preventing the moisture W from making contact with the pressure reducing section


2


; whereby the subcooled water mist W can be injected against a high velocity steam S


1


(power most appropriate for dispersing (subdividing) the subcooled water mist W) immediately after passing through the pressure reducing section


2


.




Therefore, the present invention can depressurize and condition superheated steam, and moreover, the size of the valve can be reduced and still avoid cracking and breaking of pressure reducing section


2


.




DETAILED DESCRIPTION




Reference is now made to the Drawings wherein like reference characters denote like or similar parts throughout the Figures.




In the preferred embodiment, a cylindrical body


6


comprising a first port


1


for introducing a superheated steam S and a second port


3


for discharging depressurized and desuperheated steam is provided with a pressure reducing section


2


for cooling and depressurizing the superheated steam S, and a moisture jet section


5


for cooling by injecting a mist of subcooled water W into the steam S


1


having passed through pressure reducing section


2


.




Pressure reducing section


2


comprises, as shown in

FIG. 1

, a vertically movable plug


9


having a small hole section


8


provided with small holes


8




a


scattered around a cylindrical body with an open lower end, and a diffuser


11


fixed to the body


6


at the lower position of this plug


9


in communication with said plug


9


, and having a small hole section


10


provided with small holes


10




a


scattered around a cylindrical body with a bottom and an open upper end, and is configured to depressurize the superheated steam S by passing through the small hole


8




a


of the plug


9


and the small holes


10




a


of the diffuser


11


and transform it into an annular flowing steam S


1


.




The moisture jet section


5


is provided with one or more (preferably at least 3) nozzles


4


disposed annularly and on a same plane for supplying atomized moisture W (subcooled water) to an inner wall face of the body


6


. Subcooled water mist W is supplied to nozzles


4


by water supply pipe


7


. Additional groups of nozzles


4


may be juxtaposed in the longitudinal direction of the body


6


in several stages in the longitudinal direction.




Moreover, in this embodiment, a flat nozzle


4




a


(jet angle 160 degrees or less, nozzle gap 10 mm or less) is adopted having a flat (sector) jet pattern r. The planar orientation of the jet pattern subcooled water mist W from this flat nozzle


4




a


is oriented perpendicular to the flow direction of the annular flow vapor S


1


, and at a predetermined distance L, between the jet pattern r of the subcooled water mist W injected from this flat nozzle


4




a


and the pressure reducing section


2


preventing the subcooled water mist W from making contact with the pressure reducing section


2


.




Also, among these nozzles


4


, at least the nozzle


4


nearest the pressure reducing section


2


should be a flat nozzle


4




a


, and the other nozzles


4


may either be nozzles


4


having a conical jet pattern r of the subcooled water mist W similarly to the conical jets known in the prior art or flat nozzles


4




a.






It will be understood by those skilled in the art that the number of nozzles


4


can be varied to adjust the temperature of the steam S


2


exiting the conditioning valve of the present invention.




In operation, the conditioning valve


20


desuperheats and depressurizes the superheated steam S introduced from the first port


1


by passing through the pressure reducing section


2


, transforms it into a high velocity annular flowing depressurized steam S


1


flowing into the moisture jet section


5


from an annular section defined between the body


6


and the pressure reducing section


2


. The mist of subcooled water W is injected from the nozzle


4


and impinges against the annular flowing steam S


1


. The subcooled water mist W is dispersed (subdivided) to cool the depressurized steam S


1


which exits valve


20


as depressurized and desuperheated steam S


2


.




In this embodiment, having flat nozzle


4




a


with a flat jet pattern r, the nozzle


4


can be disposed as near as possible to the pressure reducing section


2


(diffuser


11


). Nozzle


4


can be positioned closer to pressure reducing section


2


than the nozzle


134


of the prior art that injects the chilled water mist W conically. The mist W impinges against the powerful (power most appropriate for subdividing the moisture W) annular flowing steam S


1


immediately after exiting the annular spaces between the body


6


and the pressure reducing section


2


.




In this respect, the Applicant has performed various experiments, confirming the following points:




A nozzle


134


having a conical subcooled water mist W jet pattern r (as in the prior art), cannot be disposed near the pressure reducing section


2


because it is difficult to have sufficient velocity in the annular flowing steam S


1


to disperse (subdivide) the subcooled water mist W. Additionally, the collision angle of the annular flowing steam S


1


varies due to an unstable jet direction. The relative velocity of the annular flowing steam S


1


fluctuates, and the mist diameter after the subdivision by the collision with the annular flowing steam S


1


becomes uneven, reducing the cooling effect (it is important to make the mist diameter after the subdivision by the collision even to achieve effective cooling).




On the contrary, if a flat nozzle


4




a


is adopted as in the present invention, the nozzle


4


can be disposed as near as possible to the pressure reducing section


2


as mentioned before. It is possible to make the annular flowing steam S


1


impinge powerfully against the subcooled water mist W and to subdivide the mist W sufficiently, and moreover, as the annular flowing steam S


1


is injected in a fixed direction perpendicular to the flow direction of the annular flowing steam S


1


, the mist diameter after the subdivision becomes even, increasing the cooling effect dramatically over the prior art.




Moreover, in this embodiment, as the nozzle


4


can be disposed as near as possible to the pressure reducing section


2


, it is possible to reduce the longitudinal length of the lower portion (moisture jet section)


5


in which the mist W is injected, and eventually to reduce the size of the whole valve.




A preferred embodiment of the invention has been illustrated in the accompanying Drawings and described in the foregoing Detailed Description. It will be understood that the invention is not limited to the embodiment disclosed, but is capable of numerous modifications without departing from the scope of the invention as claimed.



Claims
  • 1. A steam pressure reducing and conditioning valve for passing a superheated steam inflowing from a first port through a pressure reducing section, and supplying a mist of subcooled water and discharging cooled and decompressed vapor from a second port, wherein a nozzle for supplying said mist is provided in the proximity to said pressure reducing section, a flat nozzle injecting said mist in a planar pattern whereby the planar orientation is perpendicular to the direction of steam flows, and it is disposed a predetermined distance from said pressure reducing section.
  • 2. The valve of claim 1, wherein the pressure reducing section has a bottom and a cylindrical form, and the mist pattern is substantially parallel to the bottom of the pressure reducing section.
  • 3. The vapor change valve of claim 1, wherein nozzles for supplying said mist are juxtaposed longitudinally in several stages in the flow direction of steam oriented towards the second port and at least the nozzle disposed at the position nearest to the pressure reducing section is a flat nozzle.
  • 4. A conditioning valve for desuperheating and depressurizing superheated steam, the valve comprising:a pressure reducing section for reducing the pressure of the steam; and a moisture jet section downstream of the pressure reducing section, wherein the moisture jet section comprises: one or more flat nozzles for injecting one or more respective planar patterns of water into a flow of the steam exiting the pressure reducing section.
  • 5. The valve of claim 4, wherein at least one of the one or more flat nozzles are positioned upstream of an upstream-most position at which a conical pattern forming nozzle can be positioned without injecting a conical pattern of water that impacts the pressure reducing section.
  • 6. The valve of claim 4, wherein the one or more flat nozzles are oriented to inject the planar patterns of water perpendicular to the flow of steam.
  • 7. The valve of claim 6, wherein the one or more flat nozzles are positioned annular about the moisture jet section.
  • 8. The valve of claim 4, comprising a plurality of nozzles spaced longitudinally in stages downstream from the one or more flat nozzles.
  • 9. The valve of claim 8, wherein the plurality of nozzles comprises groups of nozzles in the stages.
  • 10. A conditioning valve for desuperheating and depressuring superheated steam, the valve comprising:a pressure reducing section comprising: a plug having a small-hole section comprising: a cylindrical body having a bottom, a plurality of small holes scattered about the cylindrical body proximate the bottom, wherein steam exits the pressure section in rapid annular flow; and a moisture jet section downstream of the pressure reducing section, the moisture jet section comprising one or more flat nozzles for injecting one or more respective planar patterns of water into the flow of steam exiting the pressure reducing section.
  • 11. The valve of claim 10, wherein the flat nozzles are oriented to inject the planar patterns of water perpendicular to the flow of steam.
  • 12. The valve of claim 11, wherein the fiat nozzles are annularly spaced about the moisture jet section.
  • 13. A method of desuperheating and depressuring superheated steam, the method comprising:depressuring superheated steam; transforming the steam into rapid annular flow; and injecting one or more planar patterns of water into the rapid annular flow.
  • 14. The method of claim 13, comprising:positioning nozzle jets for forming the one or more planar patterns of water proximate to structure for depressurizing the steam while avoiding contacting the structure with the planar patterns of water.
  • 15. The method of claim 14, wherein positioning the nozzles comprises positioning at least one nozzle for forming a planar pattern of water at an upstream position to inject water into the flow while the flow is uniform and rapid and orienting the at least one nozzle to avoid contacting the structure with water from the nozzle.
  • 16. The method of claim 13, comprising injecting the one or more planar patterns of water from positions spaced annularly about the annular flow of steam.
  • 17. The method of claim 16, comprising injecting the one or more planar patterns of water into the annular flow prior to the flow substantially decreasing in speed or becoming substantially non-uniform.
RELATED APPLICATION

The present invention includes common subject matter disclosed in U.S. application Ser. No. 10/038,985 entitled Steam Pressure Reducing and Conditioning Valve by the same inventor Hiroyuki Higuchi filed concurrently on Jan. 4, 2003, the disclosure of which is incorporated herein by reference.

US Referenced Citations (90)
Number Name Date Kind
1152176 Hennebohle Aug 1915 A
1307986 Randall et al. Jun 1919 A
1832652 Peebles Nov 1931 A
2095263 Moss Oct 1937 A
2207646 Van Der Ploeg Jul 1940 A
2354842 Spence Aug 1944 A
2421761 Rowand et al. Jun 1947 A
2924424 Titterington Feb 1960 A
2984468 Kuhner May 1961 A
3034771 Marris May 1962 A
3050262 Curtis Aug 1962 A
3207492 Zikesch Sep 1965 A
3219323 Spence Nov 1965 A
3220708 Matsui Nov 1965 A
3318321 Odendahl May 1967 A
3331590 Battenfeld et al. Jul 1967 A
3496724 Wilson Feb 1970 A
3648714 Laveau Mar 1972 A
3709245 O'Connor, Jr. Jan 1973 A
3719524 Ripley et al. Mar 1973 A
3722854 Parola Mar 1973 A
3732851 Self May 1973 A
3735778 Garnier May 1973 A
3746049 O'Connor, Jr. Jul 1973 A
3750698 Walchle et al. Aug 1973 A
3776278 Allen Dec 1973 A
3813079 Baumann et al. May 1974 A
3856049 Scull Dec 1974 A
3904722 Onodo et al. Sep 1975 A
3931371 Maurer et al. Jan 1976 A
3941350 Kluczynski Mar 1976 A
3978891 Vick Sep 1976 A
3981946 Soya et al. Sep 1976 A
3990475 Myers Nov 1976 A
4011287 Markey Mar 1977 A
4022423 O'Connor et al. May 1977 A
4068683 Self Jan 1978 A
RE29714 Hayner et al. Aug 1978 E
4105048 Self Aug 1978 A
4128109 Chervenak et al. Dec 1978 A
4149563 Seger Apr 1979 A
4243203 Mack Jan 1981 A
4249574 Schnall et al. Feb 1981 A
4267045 Hoof May 1981 A
4270559 Wallberg Jun 1981 A
4278619 Tiefenthaler Jul 1981 A
4279274 Seger Jul 1981 A
4352373 Kay et al. Oct 1982 A
4383553 Platt May 1983 A
4387732 Hetz Jun 1983 A
4397331 Medlar Aug 1983 A
4407327 Hanson et al. Oct 1983 A
4413646 Platt et al. Nov 1983 A
4427030 Jouwsma Jan 1984 A
4442047 Johnson Apr 1984 A
4505865 Wullenkord Mar 1985 A
4567915 Bates et al. Feb 1986 A
4593446 Hayner Jun 1986 A
RE32197 Self Jul 1986 E
4619436 Bonzer et al. Oct 1986 A
4624442 Duffy et al. Nov 1986 A
4671321 Paetzel et al. Jun 1987 A
4688472 Inglis Aug 1987 A
4718456 Schoonover Jan 1988 A
4739795 Ewbank et al. Apr 1988 A
4887431 Peet Dec 1989 A
4909445 Schoonover Mar 1990 A
4941502 Loos et al. Jul 1990 A
4967998 Donahue Nov 1990 A
5005605 Kueffer et al. Apr 1991 A
5012841 Kueffer May 1991 A
5156680 Orzechowski Oct 1992 A
5336451 Lovick Aug 1994 A
5380470 Jacobsson Jan 1995 A
5385121 Feiss Jan 1995 A
5390896 Smirl Feb 1995 A
5427147 Henriksson Jun 1995 A
5672821 Suzuki Sep 1997 A
5730416 Welker Mar 1998 A
5762102 Rimboym Jun 1998 A
5765814 Dvorak et al. Jun 1998 A
5769388 Welker Jun 1998 A
5819803 Lebo et al. Oct 1998 A
5924673 Welker Jul 1999 A
5931445 Dvorak et al. Aug 1999 A
6003551 Wears Dec 1999 A
6105614 Bohaychuk et al. Aug 2000 A
6250330 Welker Jun 2001 B1
6289934 Welker Sep 2001 B1
20020960552 Higuchi Jul 2002
Foreign Referenced Citations (9)
Number Date Country
37 17 128 Dec 1988 DE
298 01 762 Apr 1998 DE
595499 Oct 1925 FR
2082083 Nov 1971 FR
772058 Apr 1957 GB
2019532 Oct 1979 GB
61153082 Jul 1986 JP
WO 9100971 Jan 1991 WO
WO 97 03313 Jan 1997 WO
Non-Patent Literature Citations (11)
Entry
Patent application Ser. No. 10/082,620, filed Feb. 22, 2002.
Stares, Gober and Robert; “4100 Series Control Valves”; Masoneilan; May 1997; 6 pages.
SteamForm Conditioning Valves, Yarway Tyco Corporation 1981.
Copes-Vulcon; SA-35 Steam Atomizing Desuperheater, White; Consolidated Industries, Bulletin 1164; May 1; 5 pages.
Patent application Ser. No. 10/039,345, filed Jan. 4, 2002.
Patent application Ser. No. 10/038,985, filed Jan. 4, 2002.
Hiroyuki Higuchi, Steam Pressure Reducing and Conditioning System, U.S. patent application Ser. No. 10/039,343, filed Jan. 4, 2002.
European Search report for Application 02007252 dated Apr. 3, 2003.
European Search report for Application 02007253.4 completed Jul. 24, 2002.
Product Brochure titled “Masonelian Steam Form II” printed Oct. 12, 2001 and distributed at Power Generation Show held in Las Vegas, Nevada on Dec. 11-13, 2001 and at Power Generation Show in Milan, Italy Jun. 11-13, 2002.
European Patent Office Search Report signed by Girbes Fontana, completed Sep. 8, 2003.