VO-ll & VO-76 VARIABLE ORIFICE DESUPERHEATER

Transcription

1 VO-ll & VO-7 VRIL ORIFI SUPRHTR

2 opes-vulcan has been providing control valves and desuperheaters for the power, process and nuclear industries since 90. SPX provides a wide range of valves for the control of pressure, temperature and flow-induced noise in all types of power plants. Products include severe service and general service control valves, variable orifice desuperheaters, Raven, trim and steamconditioning valves and nuclear control valves, as well as custom designed specialty valves. opes-vulcan is recognized worldwide as a leader in valves for severe and critical service Variable Orifice esuperheater opes-vulcan s VO Variable Orifice esuperheater is recognized industry wide as the most versatile desuperheater available. It is easily capable of meeting the most demanding needs for desuperheating in both the power and process industries. The VO offers extremely fine control and exceptional turndown that is limited only by the rangeability of the coolant control valve itself. With excellent mixing of vapor and coolant, control is possible throughout the entire operating range to within2 ± 5 F (± 2.5 ) of the set point which can be as close as F (5 ) above saturation. The coolant pressure which is required at the inlet to the VO need only be 5 psi (5 kpa) above the pressure of the vapor being desuperheated. ecause virtually all of the desuperheating occurs within the VO body itself, the temperature sensing element can be as close as ( m) from the desuperheater outlet. applications. Our strength lies in our ability to provide innovative valve solutions for our customers application needs. Finding innovative ways to help the world meet its ever growing demand for power is a key focus for SPX. SPX provides creative solutions the serve global energy markets in a myriad of ways. Our ideas are description and principle of operation The Variable Orifice esuperheater consists of a body which houses the desuperheater internals. The body incorporates a screwed-in seat over which a cage is located in such a manner that a coolant annulus is created around the seat. The coolant enters this annulus by means of a branch on the desuperheater body. The plug is free floating but incorporates a spring-loaded button which provides stability to the plug under light load conditions. Incorporated in the top of the cage is a plug stop to limit the amount of travel of the plug. In service, incoming vapor acts on the underside of the plug, which is weighted in such a manner that a certain amount of the energy in the vapor is used to lift the plug. helping build more efficient power plants and renovate older existing facilities. SPX supplies a wide range of components - from air preheaters to filter systems for nuclear, coal-fired, combined cycle, solar, thermal and geothermal power plants. With operations in over 5 countries, SPX has the global experience and regional presence, products and powerful ideas it takes to help our customers compete more effectively, and more efficiently deliver power to almost any part of the world. Model VO oolant Inlet onnection Integral Plug Travel Stop Loading Spring ontrolled Temperature Outlet onnection Integral age Plug Seat High Temperature Inlet onnection

3 s more vapor flows through the desuperheater, the higher the plug is lifted, thus creating a variable orifice for the vapor flow. The energy used in lifting the plug creates a pressure drop across the seat which is quite constant regardless of the vapor flow. This pressure drop creates a relatively high velocity across the seat area, and it is at this point of low pressure constant velocity that the coolant is admitted into the vapor flow. oolant enters the annulus under the dictates of a control valve responsive to a temperature controller sensing the downstream vapor temperature. The coolant is admitted into the vapor flow through a peripheral gap between the underside of the cage and the top of the seat. oolant is admitted all around the seat, thus ensuring that unequal cooling does not occur. Typical product applications Power Generation hemical Oil & Gas Pulp & Paper The coolant is picked up by the vapor flow as it discharges from the seat, and the low pressure zone that exists at this point is instrumental in atomizing the coolant into fine particles. In the turbulence which ensues as a result of the change in direction and velocity of the vapor, intimate mixing of the vapor and coolant takes place. bove the plug, as the vapor attempts to return to laminar flow, a vortex is created and any particles of coolant not completely absorbed by the vapor are drawn into this vortex where they suffer a further pressure reduction which again Temperature Sensing Point Temperature ontroller ir Supply speeds up the atomizing process. s virtually all of the desuperheating occurs within the desuperheater Long Radius end body itself, and as no coolant impinges on either the desuperheater or associated piping, no protective thermal liners are required. esuperheated Vapor Outlet Non-Return Valve INSTLLTION The desuperheater is designed for installation in a vertical run of pipe with flow upwards. There are no requirements for straight pipe upstream or downstream of the unit, however, if a bend is located immediately at the outlet, it should be a long radius elbow. Superheated Vapor Inlet oolant ontrol Valve No load: Plug has seated itself on the seat ring. There is no flow of steam and no flow of cooling water into the steam. Light load: Plug opens orifice slightly. ooling water is instantly and intimately thoroughly mixed with the steam. Full load: Orifice fully opened. There is the same pressure drop and high turbulence at all loads over the full range.

4 Model VO-II The basic design of the pressure retaining part of the VO-II is in accordance with NSI (.S.50). Sizes The VO-II is currently available in sizes (80mm) through (500mm). Materials of onstruction arbon steel STM 2-W Low allow steel STM 27-W Other castable materials available on request. Pressure Ratings VO-II desuperheaters are available in NS pressure classes,, and. For additional sizes, pressure classes, and configurations, refer to Model VO-7. nd onnections VO-II desuperheaters are normally supplied with flanged connections to NSI (S 50) IN (S 50) or S. For additional sizes, end connections, and configurations, refer to Model VO-7. Sizing/Selection The VO-II and all opes-vulcan desuperheaters can be sized by opes-vulcan or an authorized Sales Representative to assure correct application. Typical information required to size: Process steam flow rates Process steam pressure Process steam temperature (superheated) esired process steam temperature (desuperheated) vailable cooling water pressure vailable cooling water temperature Process steam line size and schedule VO-II imensions / lass Rating UNIT SIZ NORM. OR / RTING RTING RTING (80) (80) (25) (0) 7 (78) 5 (27).75 (9) 7.25 (8) 5.8 (7).25 (2) 7. (9) 5. () (0) (0) (25) (5) 7.5 (9) 5 (27) 5 (8) 7.75 (97) 5.5 (0) 5.5 (9) 8. () 5.75 () () () (25) 8 (57) 9. (2) (52) 9.25 (89) 9.88 (25). (8) (508).25 (20) 7 (78) 8 (0) 8 (0) (25) 22 (559).5 (5) 2.75 (0) (279) 7.8 (87) 2.25 ().8 (289) 7. (9) (250) (250) (0) (705) 2.75 (2) 7.75 (97) 29.5 (79) (0) 8. (29) 0 (72).8 (0) 8.88 (225) 2 () 2 () (0) (8) 5 (8) 8.75 (222) 5.75 (908) 5.25 (87) 9. (2).75 (9) 5. (97). (257) (50) (50) (0) 9.5 (0) 7 (2) 9 (229).25 (8) 7.25 (8) 9.88 (25) 2.5 (79) 7. (8).5 (27) () () (0) (92) (508) (25).5 () (5) (8). (52) (292) 8 (50) 8 (50) (0) 50 (22) 2 (5) (279) (80) 2.25 (50) 2. (0) (58) 2. (59) 2.88 (27) (500) (500) 2 (50) Inch (millimeter)

5 Model VO-7 While virtually identical in operation and performance to the VO- II, the VO-7 is offered by opes-vulcan as an alternate when existing piping requires a custom fit, where pressure ratings exceed class, or where size requirements exceed those offered in the VO-II. s rrangement #, the VO-7 housing is supplied as a cast unit with integral inlet flange and butt weld outlet. rrangement #2 welds a reducer to the above description. The standard reducer results in a butt weld outlet the same nominal size as the flanged inlet, but non-standard sizes are also available. s rrangement #, a weld neck flange is added to the combination of housing and reducer. gain, the standard arrangement has the same size inlet and outlet flanges. y using various sized reducers/expanders and/or flanges, an almost endless variation of dimensions and end connections can be achieved. The VO-7 is also available with a housing fabricated from forged and wrought piping components when technical specifications and/ or N..T. requirements preclude the use of castings. gain, reducers and flanges can be added as required, but unlike the cast VO-7, this applies to both inlet and outlet on the fabricated version of the VO-7. rrangement # rrangement #2 rrangement # 5

6 VO-7 imensions NSI Pressure lasses -0 SIZ NSI LSS HOUSING HOUSING W/ HOUSING W/ & OUTLT FLNG HOUSING & I.. OOLNT FLNG SIZ F & G 5.75 () 8.25 () (292) (292) 5.75 () 5.75 () 5.75 () 8.5 (70) 8.88 (79) 8.88 (79).75 (527).75 (527) 5 (27).75 (9) Flange size per NSI.25 () 9 (8).25 ().25 () 9.8 (92) 9.75 (502) G () (5) (5) (5) (5) (5).5 (8) 5.5 (9).25 ().25 () 7.88 (5) 9.5 (95) 2 (5) 2 (5) 2 (5) 2 (5) 2 (5) 22.5 (57) 2.5 (22) 2.5 (22) 2.5 (22) 2.5 (22) 9.75 (502).5 (52) (578) 2.8 (70) 2 () 2.8 (9) 2.75 (29) () 2.25 (7) 27. (702) 28 (7) 28.8 (72) 28.8 (72) 29.8 (7) (52) (25) 2 (05).75 (9) (25.) (8.) Please contact opes-vulcan for F and G dimensions. Typical Fabricated rrangement VO-7 typically will be one nominal size smaller than the equivalent VO-II. oth will have the same size plug and F 2.5 (22) 0.25 (78) internal components (89) (58) (5) (92) 0.88 (78) 29.8 (7).25 (870) 9.9 (995).8 (88) Request available pressure/ temperature ratings and dimensions. (5) 29.8 (7).75 (857) (5) (5) (5) 2.25 (59) 29.9 (75) 29.9 (75) 29. (752).8 (88).5 (878) 5.9 (89).25 (92) 2 (9) (5) 2 (50.8) Note: ll dimensions are subject to change without notice. Request certified drawings. Inch (millimeter)

7 VO-7 imensions (ont.) NSI Pressure lasses -0 SIZ NSI LSS HOUSING HOUSING W/ HOUSING W/ & OUTLT FLNG HOUSING & I.. OOLNT FLNG SIZ F & G () 5.9 (89) 9.9 (995) (250) 2 () () () () (759) (759) (759) 5.9 (89) 5. (905) 5. (905) 2.9 (7) 2.9 (7) 2.9 (8) 9.8 () 0.75 (5).88 ().75 (87) 7.8 () 8.8 (229) (0) (508) 2.5 (.5) (7.2) Flange size per NSI (759). (87) 2.9 (8) 7.8 (2) 9. (28) 52.8 () G (50) () 8 (50) (500). (87). (87). (87) 7. (95) 7. (95) 7. (95) 7. (95) 8. (98).75 (9) (9).75 (9) 8. (98) 8. (98) 8. (98) 7.8 (2) 8.9 (27) 9. (25) 52.9 () 5.25 (52) 5.5 (59) 5.5 (59) (0) 5. (9) 5. (9) 5.75 (5) 5.75 (9) 5. (87) 55.8 (0) 5. (25) 5. (57) 55.5 () 5.9 (27) 57.9 (72) 59 (99) (58) 0.75 (5) (2) 58. (89) 59.8 (8) 0.5 (57) 2.25 (58) 0. (52).75 (58) () 2 () 2 (0) 28 (7) 0 (72) (7.2).5 (88.9) (.) (.) (.) Please contact opes-vulcan for F and G dimensions. Typical Fabricated rrangement VO-7 typically will be one nominal size smaller than the equivalent VO-II. oth will have the same size plug and internal components. F 2 () 8. (98) 0.8 (2). (57).5 (5) 5.9 (89) (52) 2.5 (587) 5 (5) 2. (58) 5.88 (7) 9. (75) 72. (82) (9) (7.2) Request available pressure/ temperature ratings and dimensions. Inch (millimeter).75 (7).25 (8) 7.5 (892) Note: ll dimensions are subject to change without notice. Request certified drawings. 7

8 VO-ll & V0-7 variable orifice esuperheater Global locations SPX Flow Technology SPX Flow Technology SPX Flow technology SPX Flow technology 5 West Road Road Two, Industrial state 25 International usiness Park F Treasury uilding McKean, P 2 Winsford, heshire W7 QL #0-0/2 German entre 58 Hua Shan Road United States of merica ngland Singapore 099 Shanghai PR hina ased in harlotte, North arolina, SPX orporation (NYS: SPW) is a global Fortune 500 multi-industry manufacturing leader. For more information, please visit SPX Flow Technology 5 West Rd. McKean, P 2 P: (8) F: (8)7-585 : cv@spx.com SPX reserves the right to incorporate our latest design and material changes without notice or obligation. esign features, materials of construction and dimensional data, as described in this bulletin, are provided for your information only and should not be relied upon unless confirmed in writing. Please contact your local sales representative for product availability in your region. For more information visit The green > is a trademark of SPX orporation, Inc. ISSU 0/2 V-7-US OPYRIGHT 2 SPX orporation