CN102563157B - Midstream low-temperature process control pressure reduction throttling valve - Google Patents
Midstream low-temperature process control pressure reduction throttling valve Download PDFInfo
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- CN102563157B CN102563157B CN201110294957.8A CN201110294957A CN102563157B CN 102563157 B CN102563157 B CN 102563157B CN 201110294957 A CN201110294957 A CN 201110294957A CN 102563157 B CN102563157 B CN 102563157B
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Abstract
The invention relates to a -200 DEG C midstream low-temperature process control pressure reduction throttling valve technique. A midstream pipeline valve is used, namely, the valve is designed into a cylindrical structure with a diameter similar to that of a pipeline and is directly mounted in the pipeline through a pipeline flange, the direction of controlled fluids is consistent with that of a pipeline and a throttling direction, and the pressure reduction throttling process of midstream pipeline low-temperature fluids, non-dynamic seal pipeline transport of the low-temperature fluids and process control are realized. The technique solves the problem of pipeline leakage caused by dynamic seal failure due to sudden change of low-temperature high-pressure multiphase flow working condition in the pipeline, decreases kinetic energy loss of the controlled fluids and pipeline flow resistance, saves technical process space, enables field management to be more convenient, is applicable to the pressure reduction throttling refrigeration process and the pressure and temperature control process of the low-temperature fluids in the pipeline, enables a phase change transport process to be more stable, can also be used for solving the technical problem of difficulty in low-temperature multiphase flow dynamic phase change refrigeration, improves phase change refrigeration efficiency of the fluids in the pipeline, and realizes effective management for the low-temperature fluids in the pipeline.
Description
Technical field
The invention belongs to the cryogenic refrigeration fields such as LNG Liquefied natural gas (LNG), gas separation and liquefaction, relate to streaming chilling process control pressure reducing throttle valve technology in one-200 ℃, in employing, streaming pipeline valve is about to the cylindrical structural that valve design one-tenth is close with pipe diameter and is directly installed in pipeline by piping flange, make controlled fluid direction consistent with duct orientation and throttling direction, the decompression throttling process of streaming pipeline cryogen and cryogen stationary seal pipeline transportation and process control object in realization.The invention solves in pipeline the motive sealing causing that suddenlys change of cryogenic high pressure multiphase flow operating mode and destroy the pipe leakage problem causing, controlled fluid kinetic energy rejection and Flows resistance have been reduced, save technological process space, field management is convenient, be applicable to decompression throttling refrigeration and pressure and the temperature controlled processes of pipeline cryogen, make phase transformation transport process relatively stable, also can be used for solving the dynamic phase-change cooling technology difficult problem of low temperature multiphase flow, the freezing by change of state efficiency that improves pipeline fluid, realizes effective management of pipeline cryogen.
Background technique
Conventional process control valve One's name is legion in cryogenic system set technique flow process, there are pressure controlled valve, heat-operated valve, refrigeration throttle valve and a large amount of low-temperature switch valve etc., be indispensable main process control apparatus in set technique equipment, general adopt motive sealing to regulate, flange or be threaded.The dynamic sealing material being connected with pipeline under worst cold case easily occurs that low temperature lost efficacy, and leaking often appears in sealing surface, has very large potential safety hazard, and especially for flammable explosive gas, the danger that leakage causes is larger.Process control is equipped in reducing pressure by regulating flow process can produce strong vibration, very easily causes link motive sealing to leak, and as throttle valve relies on vibration completely, could produce refrigeration effect etc.The cryogen temperature transporting in pipeline and pressure very easily cause overheated boiling and produce multiphase flow, cause temperature and pressure generation drastic change in pipeline, process control equipment must possess the ability of controlling multiphase flow, improve decompression and throttling refrigeration process efficiency and reaction velocity, so the process control valve being connected with pipeline must possess following primary condition: can bear violent pressure and temperature instantaneous variation process; Valve motive sealing is the least possible; Pipeline can bear violent vibration, and link does not come off, and does not leak; Throttle valve for throttling refrigeration and low-temperature liquefaction must produce throttling refrigeration effect, effectively throttling multiphase flow; Reduction valve palpus stable control process pressure can play the effect of safety valve in the situation that of pressure jump; Convenient for installation and maintenance etc.The present invention is directed to the decompression throttle efficiency and the motive sealing leakage problem that in the process control of pipeline cryogen and transport process, exist, streaming chilling process control pressure reducing throttle valve in proposition, reduction process kinetic energy rejection, improve process control reaction velocity, meet cryogenic piping and transport pressure and temperature control requirement, make cryogen transport and process of refrigerastion in stationary seal, reduced due to the outlet of transformation, alternating temperature and the heterogeneous unstable system pressure sudden change causing of fluid, finally realized that cryogen stationary seal transports and process control object.Middle streaming chilling process control pressure reducing throttle valve in cryogen filling or system starting process to excess refrigerant further gasify swell refrigeration, further diffusion keep that overall structure is stable, overall pressure reasonable layout has important function equally.
Summary of the invention
The present invention is according to pipeline cryogen multiphase flow transport process control technique feature, invented middle streaming chilling process control pressure reducing throttle valve, the cry-fluid flow that is used for the pipeline refrigeration process that solves transformation, alternating temperature, variable-flow transports the technical barrier bringing, reduce kinetic energy rejection and motive sealing leakage problem in cryogen transport process, improve cryogen process control and freezing by change of state efficiency in pipeline, realize the relatively stable of the interior decompression of cryogen pipeline and throttling refrigeration process.
Technical solution of the present invention:
Middle streaming chilling process control pressure reducing throttle valve mainly consists of positioning dowel 1, pipeline 2, spring capping 3, upper flange 4, upper bolt 5, upper cap nut 6, valve body 7, valve seat 8, valve rod 9, lower nut 10, lower bolt 11, pipeline 12, lower flange 13, three-flange seal ring 14, the 4th flange seal ring 15, valve core seal ring 16, lower spring packing ring 17, spring 18, upper spring packing ring 19, the first flange seal ring 20, the second flange seal ring 21, screw 22, lower catch hoop 23, front band 24, it is characterized in that: valve rod 9 screw top connect gland 3; Gland 3 is installed in valve seat 8; Valve seat 8 connects valve body 7 by screw 22; Pin 1 is through gland 3 and valve rod 9 preformed holes; Pin rod front band 24 is installed in gland 3 top draw-in grooves with lower catch hoop 23; Gland 3 and the middle mounting spring 18 of valve seat 8; Spring 18 centers are valve rod 9, and top contacts with Upper gasket 19, and bottom contacts with lower levelling plate 17; The spring 18 pretension valve rod 9 bottom spool conical surfaces and valve body 7 bottom diffusion cover inner surfaces form sealing surface; Valve core seal ring 16 is installed in valve rod 9 bottom spool conical surface seal grooves.
Valve body 7 is the symmetrical hollow cylindrical structure of integral shaft; On valve body 7, lower limb is provided with flange, has the trapezoidal seal groove of twice on flange, and pad is installed in seal groove; Valve body 7 upper flanges are connected with upper cap nut 6 by upper bolt 5 with pipeline 2 upper flanges 4, between by the first flange seal ring 20, the second flange seal ring 21, seal; Valve body 7 lower flanges are connected with lower nut 10 by lower bolt 11 with pipeline 12 lower flanges 13, between by three-flange seal ring 14, the 4th flange seal ring 15, seal; In valve body 7, there are three sections of coaxial non-isometrical cylindrical spaces and a diffusion space, first paragraph cylindrical space is installed valve Cuo 8 flange plate by screw 22, second segment cylindrical space and valve Cuo 8 outer cylinders form annular airflow space, the 3rd section of cylindrical space is before throttling, to adjust section, the 4th section of flaring space is diffuser, and diffuser center is valve rod 9 spools.
Valve seat 8 is the symmetrical hollow cylindrical structure of integral shaft, has inlet hole on flanged surface; Valve seat 8 bottom planes have circular hole, and valve rod 9 can and move up and down through circular hole.
When pipeline inner high voltage hydrodynamic pressure is greater than spring 18 pretightening force, fluid enters annular space between valve seat 8 and valve body 7 through valve seat 8 inlet holes, and flow downward to valve seat 8 bottoms, compressing valve rod 9 drives gland 3 Compress Springs 18 and moves downward, after valve rod 9 bottom spools and valve body 7 diffusion cover reducing pressure by regulating flows, leave valve, realize throttling refrigeration and antihypertensive effect in cryogen pipeline.
The Principle Problems that scheme is related:
Under-200 ℃ of worst cold cases, due to atmosphere environment not section heat is provided, in low temperature conveying pipe, cryogen is in saturated or superheat state, very easily produce multiphase flow, multiphase flow very easily causes overheated boiling or subcooled boiling, make cryogen in fierce phase transition process and be attended by pressure and temperature jump, constantly producing a large amount of saturated vapors, superheated vapor, saturated liquids, super-heated liquid etc.Cryogen is in pipeline transportation process, system pressure and difficult control of temperature, freezing by change of state process is complicated and changeable, cryogen temperature and pressure acute variation in pipeline, joint flange seal part or the spiral seal material of pipeline and process control valve are very easily destroyed, cause cryogen in pipeline to be leaked, produce great potential safety hazard.General pressure reducing throttle valve mainly adopts the throttle style perpendicular to pipeline, often with controlling device manually or automatically, in throttling or decompression process, because fluid will change direction completely, the kinetic energy rejection of convection cell is larger, long flow path, easily produce and rub and produce thermal effect, restriction effect is poor, and control valve stem part is direct and extraneous contact, easily causes leaking.Owing to adopting vertical arrangement, when flow increases, the volume of general expenditure and pressure valve often increases, and seems and protrude very much in pipeline, has brought many space troubles to complicated technological process pipeline management.Pressure and temperature in general large-scale low-temperature pipeline all need the stabilization process that remains long-term, often there is multiphase flow process, so control procedure flexibility is large, pressure jump is large, and changes in flow rate is large, temperature variation is large, need valve to have wider throttling space, can throttling saturated vapor, superheated vapor, gas-liquid two-phase, overcooled liquid etc., there is expenditure and pressure and Safety function, expenditure and pressure process resistance is little, and reaction is fast.During the present invention applies emphatically, streaming pipeline valve principle, throttling differential refrigeration effect, prestressing force equilibrium principle etc. realize effective management process of cryogen.First, application numerical simulation calculation process, calculate in detail uninterrupted and pressure size when pipeline is interior produces multiphase flow, determine the through-flow size of minimum of valve, the minimum through-flow size of foundation is by the valve global design one-tenth cylindrical structure consistent with pipe diameter again, and apply piping flange and be connected in pipeline, outside without projection, fluid pressure throttling direction is consistent with flow direction, valve rod 9 directions are consistent with duct orientation, realize streaming decompression throttling process in cryogen, reduce the kinetic energy rejection of fluid, save technological process space, improve valve process control reaction velocity.Because Subzero valve is installed in pipeline, stationary seal, integrated piping does not interrupt continuously, thereby cryogen pipe joint motive sealing destructible, the easy leakage problem of system have been solved, meanwhile, pipeline connects for flange outward, and appearance is without protrusion, make process control technological process simpler, external device management is convenient.Secondly, application throttling differential effect, by built in pipeline throttle valve control pipeline cryogenic system temperature, can produce throttling refrigeration effect and export cold, and making fluid temperature (F.T.) is required control temperature.Then, application prestressing force equilibrium principle, make working pressure in the prestressing force of spring under worst cold case and pipeline reach balance, valve open expenditure and pressure when pipeline pressure reaches spring prestressing force, pipeline pressure reduces late gate closes automatically, realizes cryogen without sealing nothing, leak throttling refrigeration and step-down object with this in pipeline.Finally, can be the required pilot pressure of fluid by low pressure in mechanism of decompressor control cryogenic system, when manifold pressure reaches system allowable pressure, reduction valve can fast automaticly be opened, while being less than allowable pressure, valve closing, realizes level pressure control object with this, and this technology also can be applicable to the gasification peak regulation pressurization of decompression process and the cryogenic liquide of pressurized gas under normal temperature.
Technical characterstic of the present invention:
For cryogen process control problem in pipeline, middle streaming chilling process control pressure reducing throttle valve can meet pipeline cryogenic fluid pressure and temperature control requirement, realize stationary seal transport process in cryogen pipeline, can make full use of throttling cold in pipeline, realize cryogen high low pressure control object in pipeline, and decompression and throttling refrigeration double utility; Valve has broader throttling space, and low temperature multiphase flow that can throttling complexity, has throttling and decompression and Safety function; Fluid pressure throttling direction is consistent with flow direction, and expenditure and pressure process resistance is little, and reaction is fast; Built in pipeline pressure reducing throttle valve is throttling saturated vapour, saturated fluid, overcooled liquid, super-cooled steam and multiphase flow effectively, makes the system can safety relief throttling refrigeration, finally realizes effective management of pipeline cryogen; Adopt the column valve design consistent with duct orientation, easy for installation, save material and reduced again loaded down with trivial details installation process, effectively saved technological process space, for site technique workflow management has brought convenience.
Accompanying drawing explanation
Figure 1 shows that critical piece and the mounting point relation of middle streaming chilling process control pressure reducing throttle valve.
Embodiment
Correcting spring 3 prestressing force under worst cold case, adjusting pipeline low voltage control pressure is corresponding fluid operating pressure, makes spring 3 prestressing force consistent with pipeline working pressure; Valve good manufacturing is connected in process pipe by piping flange; If internal pressure exceedes working pressure, pressure reducing throttle valve low voltage terminal is automatically opened with throttle style pressure release and is produced throttling refrigeration effect, and when system pressure is during lower than working pressure, pressure reducing throttle valve is closed automatically.
Detailed process is as described below:
Slowly open cryogenic piping 2 main switch mechanisms, apply a small amount of cryogen precooling pressure reducing throttle valve critical piece, after precooling completes, system pressure increases, cryogen enters annular space between pressure reducing throttle valve valve body 7 and valve seat 8, when pressure reaches and is greater than spring 18 pretightening force, compressing valve rod 9 drives gland 3 Compress Springs 18 and moves downward, after valve rod 9 bottom spools and valve body 7 diffuser reducing pressure by regulating flows, leave valve, realize the interior stationary seal step-down of streaming pipeline and throttling refrigeration effect in cryogen.
Claims (2)
1. streaming chilling process control pressure reducing throttle valve in a kind, comprise positioning dowel (1), pipeline (2), spring capping (3), upper flange (4), upper bolt (5), upper cap nut (6), valve body (7), valve seat (8), valve rod (9), lower nut (10), lower bolt (11), pipeline (12), lower flange (13), three-flange seal ring (14), the 4th flange seal ring (15), valve core seal ring (16), lower spring packing ring (17), spring (18), upper spring packing ring (19), the first flange seal ring (20), the second flange seal ring (21), screw (22), lower catch hoop (23), front band (24), it is characterized in that: valve rod (9) screw top connects gland (3), gland (3) is installed in valve seat (8), valve seat (8) connects valve body (7) by screw (22), pin (1) is through gland (3) and valve rod (9) preformed hole, pin rod front band (24) is installed in the draw-in groove of gland (3) top with lower catch hoop (23), gland (3) and the middle mounting spring of valve seat (8) (18), spring (18) center is valve rod (9), and top contacts with Upper gasket (19), and bottom contacts with lower levelling plate (17), spring (18) pretension valve rod (9) the bottom spool conical surface and valve body (7) bottom diffusion cover inner surface form sealing surface, valve core seal ring (16) is installed in the spool conical surface seal groove of valve rod (9) bottom, valve body (7) is the symmetrical hollow cylindrical structure of integral shaft, the upper lower limb of valve body (7) is provided with flange, has the trapezoidal seal groove of twice on flange, and pad is installed in seal groove, valve body (7) upper flange is connected with upper cap nut (6) by upper bolt (5) with pipeline (2) upper flange (4), between by the sealing of the first flange seal ring (20), the second flange seal ring (21), valve body (7) lower flange is connected with lower nut (10) by lower bolt (11) with pipeline (12) lower flange (13), between by three-flange seal ring (14), the 4th flange seal ring (15) sealing, in valve body (7), there are three sections of coaxial non-isometrical cylindrical spaces and a diffusion space, first paragraph cylindrical space is installed valve seat (8) flange plate by screw (22), second segment cylindrical space and valve seat (8) outer cylinder forms annular airflow space, the 3rd section of cylindrical space is before throttling, to adjust section, the 4th section of flaring space is diffuser, and diffuser center is valve rod (9) spool, valve seat (8) is the symmetrical hollow cylindrical structure of integral shaft, has inlet hole on flanged surface, valve seat (8) bottom plane has circular hole, and valve rod (9) can and move up and down through circular hole.
2. middle streaming chilling process control pressure reducing throttle valve according to claim 1, it is characterized in that: when pipeline inner high voltage hydrodynamic pressure is greater than spring (18) pretightening force, fluid enters annular space between valve seat (8) and valve body (7) through valve seat (8) inlet hole, and flow downward to bottom valve seat (8), compressing valve rod (9) drives gland (3) Compress Spring (18) and moves downward, after valve rod (9) bottom spool and valve body (7) diffusion cover reducing pressure by regulating flow, leave valve, realize throttling refrigeration and antihypertensive effect in cryogen pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110294957.8A CN102563157B (en) | 2011-10-08 | 2011-10-08 | Midstream low-temperature process control pressure reduction throttling valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110294957.8A CN102563157B (en) | 2011-10-08 | 2011-10-08 | Midstream low-temperature process control pressure reduction throttling valve |
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| Publication Number | Publication Date |
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| CN102563157A CN102563157A (en) | 2012-07-11 |
| CN102563157B true CN102563157B (en) | 2014-04-16 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102853080A (en) * | 2012-09-27 | 2013-01-02 | 天津振兴水泥有限公司 | Buffering bolt sealing device for ball milling machine |
| CN104776256B (en) * | 2015-03-23 | 2017-04-12 | 山东省天安矿业集团有限公司 | Mine high-flow-rate high-pressure water depressurization device |
| CN106123484A (en) * | 2015-05-09 | 2016-11-16 | 张周卫 | Cold three stream plate-fin heat exchanger of LNG low-temperature liquefaction three tier structure |
| CN106090403B (en) * | 2016-08-30 | 2018-08-10 | 常德翔宇设备制造有限公司 | Large-traffic gas accuse bellows type relief pressure valve |
| CN108662221A (en) * | 2018-07-24 | 2018-10-16 | 周玉翔 | A kind of metallurgical furnace automatic exhaust device being conveniently replaceable pipeline |
| CN114562825A (en) * | 2022-02-28 | 2022-05-31 | 武汉高芯科技有限公司 | High-overload-resistant throttling refrigerator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1471358A (en) * | 1973-08-10 | 1977-04-27 | Drori M | Fluid flow control devices and pressure regulated water sprink lers including same |
| US5372157A (en) * | 1993-06-15 | 1994-12-13 | P.A. S.R.L. | Automatic bypass valve |
| CN101836020A (en) * | 2008-03-27 | 2010-09-15 | 艾拉斯科普库空气动力股份有限公司 | Minimum pressure valve |
-
2011
- 2011-10-08 CN CN201110294957.8A patent/CN102563157B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1471358A (en) * | 1973-08-10 | 1977-04-27 | Drori M | Fluid flow control devices and pressure regulated water sprink lers including same |
| US5372157A (en) * | 1993-06-15 | 1994-12-13 | P.A. S.R.L. | Automatic bypass valve |
| CN101836020A (en) * | 2008-03-27 | 2010-09-15 | 艾拉斯科普库空气动力股份有限公司 | Minimum pressure valve |
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