CN107860171A - A kind of cryogenic liquid expanding machine shutdown system and method - Google Patents
A kind of cryogenic liquid expanding machine shutdown system and method Download PDFInfo
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- CN107860171A CN107860171A CN201711058762.7A CN201711058762A CN107860171A CN 107860171 A CN107860171 A CN 107860171A CN 201711058762 A CN201711058762 A CN 201711058762A CN 107860171 A CN107860171 A CN 107860171A
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- liquid
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- expander
- pipeline
- liquid expander
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
- F25J3/04387—Details relating to the work expansion, e.g. process parameter etc. using liquid or hydraulic turbine expansion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
- F25J3/04381—Details relating to the work expansion, e.g. process parameter etc. using work extraction by mechanical coupling of compression and expansion so-called companders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04812—Different modes, i.e. "runs" of operation
- F25J3/04824—Stopping of the process, e.g. defrosting or deriming; Back-up procedures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J2230/20—Integrated compressor and process expander; Gear box arrangement; Multiple compressors on a common shaft
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2240/00—Processes or apparatus involving steps for expanding of process streams
- F25J2240/30—Dynamic liquid or hydraulic expansion with extraction of work, e.g. single phase or two-phase turbine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2240/00—Processes or apparatus involving steps for expanding of process streams
- F25J2240/40—Expansion without extracting work, i.e. isenthalpic throttling, e.g. JT valve, regulating valve or venturi, or isentropic nozzle, e.g. Laval
Abstract
The invention discloses a kind of cryogenic liquid expanding machine shutdown system and method, turns down liquid expander nozzle aperture first, is at the same time gradually opened liquid choke valve, and both coordinateds make supercharger outlet pressure remain stable；Treat that liquid expander nozzle completely closes, close quick action emergency valve, and then liquid expander is steadily stopped transport；Then, closing liquid expanding machine inlet and outlet stop valve, opens liquid expander inlet pipeline drain valve, outlet conduit tapping valve, blow through valve, discharges liquid in expanding machine and its pipeline；Finally, introducing heating gas makes liquid expander and its pipeline temperature rise to environment temperature.The method can make the liquid expander in existing operation cryogenic air separation plant steadily stop transport and efficiently switch to choke valve decompression；The method can integrate with automated control technology, by realize from liquid expander to choke valve it is more efficient, more accurately switch.
Description
Technical field
The invention belongs to cryogenic air separation technical field, it is related to the shutdown technology of cryogenic air separation key equipment, more particularly to
A kind of cryogenic liquid expanding machine shutdown system and method.
Background technology
Cryogenic liquid expanding machine is the novel energy-saving device in large-scale space division device, for substituting traditional liquid choke valve
Complete the reducing pressure by regulating flow of highly pressurised liquid.Compared with choke valve, cryogenic liquid expanding machine can lift the efficiency of a whole set of air separation unit,
The serious cavitation phenomenons caused also by the throttling of liquid choke valve is effectively suppressed simultaneously.
In the air separation unit of reality, cryogenic liquid expanding machine is mounted in parallel with liquid choke valve, maintains the excessively stream of the two
Amount is the necessary condition of space division flow stable operation.Generally completed in the air separation unit of carrying liqs expanding machine by liquid expander high
The reducing pressure by regulating flow of press liquid medium, and choke valve is in stand-by state.The shutdown of liquid expander in the space division system to put into operation
It is exactly the process that the throttling of liquid choke valve is switched to from liquid expander throttling on process nature.In this handoff procedure, throttling
Valve opening needs gradually increase, and liquid expander nozzle aperture is gradually reduced, and both cooperations could maintain space division stream
Journey is stable, and then ensures air separation unit normal operation.If the imbalance of both adjustment, will influence each core machine of air separation unit
The stable operation of (air compressor machine, gas expander, supercharger), even results in the shutdown of a whole set of air separation unit.
It is cryogenic liquid expanding machine skill that the steady shutdown of liquid expander how is realized in the industrial air separation unit to put into operation
The key issue of art popularization and application.At present, open source information in this respect is not found with foreign countries at home.
The content of the invention
It is an object of the invention to provide a kind of cryogenic liquid expanding machine shutdown system and method, this method can make space division
The throttle device of highly pressurised liquid in device is steadily switched to liquid choke valve by liquid expander, is avoided because liquid expander
Shutdown cause the accident of whole air separation unit to stop production.
To achieve the above object, the technical scheme is that being realized by following approach：
A kind of cryogenic liquid expanding machine shutdown system, including liquid expander, liquid choke valve, drain valve, heating gas are cut
Only valve and tapping valve, inlet stop valve and quick action emergency valve, liquid expander are provided with the inlet duct of liquid expander
Outlet conduit on be provided with outlet shutoff valve, be parallel with the inlet duct and outlet conduit of liquid expander liquid throttling
Valve, and the entrance of inlet stop valve and liquid choke valve is connected with liquid input tube road, and liquid choke valve ends with outlet
The outlet of valve is connected with liquid output pipe road；Drain valve passes through the pipeline between pipeline and inlet stop valve and quick action emergency valve
It is connected, heating gas stop valve is connected by pipeline between pipeline and liquid expander and outlet shutoff valve, and tapping valve passes through pipeline
Pipeline is connected between liquid expander and outlet shutoff valve, and liquid expander is also associated with blow through valve.
Further improve of the invention is that liquid expander is directly connected with generator or power-equipment.
Further improve of the invention is that liquid expander is connected through reduction box with generator or power-equipment.
Further improve of the invention is that liquid expander and quick action emergency valve are arranged in ice chest.
A kind of cryogenic liquid expanding machine closing method, liquid expander nozzle aperture is turned down first, while open big liquid section
Valve is flowed, both synergic adjustments maintain the stabilization of supercharger outlet pressure；After liquid expander nozzle completely closes, close urgent
Stop valve, so that liquid expander unit is steadily stopped transport；Liquid expander inlet and outlet stop valve is then switched off, it is swollen to open liquid
Swollen machine inlet pipeline drain valve, outlet conduit tapping valve and blow through valve, exclude expanding machine in and pipeline in liquid；Finally utilize
Liquid expander and its pipeline are heated up to environment temperature by purified air.
Further improve of the invention is, comprises the following steps that：
First, while the nozzle aperture of liquid expander is turned down, the aperture of liquid choke valve is slowly increased, and maintain
The stable outlet pressure of supercharger, makes the load of liquid expander progressively reduce in this way；
Second, as liquid throttle valve opening gradually increases, the nozzle aperture of liquid expander gradually turns down, liquid expansion
The rotating speed of machine gradually reduces, and when liquid expander nozzle completely closes, closes quick action emergency valve, expanding machine unit is steadily stopped
Fortune；
3rd, inlet stop valve and outlet shutoff valve are closed, inlet pipeline liquid is excluded by drain valve；Pass through blowing
Valve and tapping valve, exclude liquid in liquid expander main frame and outlet conduit；
4th, blow through valve and tapping valve are closed, opens heating gas stop valve, liquid expander nozzle and emergency cut-off
Valve, purified gas is introduced into above-mentioned part and discharged by drain valve, until liquid expander inside and its inlet and outlet pipeline approach
Environment temperature, indicate that cryogenic liquid expanding machine is steadily shut down.
Further improve of the invention is, opens heating gas stop valve, quick action emergency valve and drain valve, and purifying is empty
Gas reversely sequentially enters liquid expander diffuser pipe, impeller, nozzle, spiral case and its import component.
Compared with prior art, the present invention has the advantages that：
(1) closing method of liquid expander can make liquid expander steady in cryogenic air separation plant described in the invention
While shutdown, choke valve throttling is quickly switched into.Can expand the liquid in existing operation cryogenic air separation plant using the method
Machine is steadily stopped transport and efficiently switches to choke valve decompression, is maintained the stabilization of supercharger outlet pressure, is avoided and expanded by liquid
Resistance of pipe system significant changes caused by machine shutdown and its abnormal shutdown of caused core machine, air separation unit failure are stopped transport
Problem.
(2) present invention can also be implemented with Integration ofTechnologies such as Automated condtrols, realize the automation that liquid expander is shut down
Control, it is more efficient, accurate, be reliably completed from liquid expander be throttled to liquid choke valve throttling switching.
Brief description of the drawings
Fig. 1 is block diagram of the embodiment of the present invention.
In figure：1- liquid choke valves, 2- inlet stop valves, 3- drain valves, 4- quick action emergency valve by-passing valves, 5- emergency cut-offs
Valve, 6- liquid expanders, 7- reduction boxes, 8- generators, 9- blows through valve, 10- heating gas stop valves, 11- tapping valves, 12- outlets
Stop valve, 13- ice chests.
Embodiment
The embodiment of the present invention is described further below in conjunction with the accompanying drawings.
Referring to Fig. 1, cryogenic liquid expanding machine shutdown system of the invention, including liquid expander 6, liquid choke valve 1, row
Valve 3, heating gas stop valve 10 and tapping valve 11 are put, inlet stop valve 2 and tight is provided with the inlet duct of liquid expander 6
Anxious stop valve 5, outlet shutoff valve 12 is provided with the outlet conduit of liquid expander 6, the inlet duct of liquid expander 6 is with going out
Be parallel with liquid choke valve 1 on mouthful pipeline, and the entrance of inlet stop valve 2 and liquid choke valve 1 with liquid input tube road
It is connected, liquid choke valve 1 is connected with the outlet of outlet shutoff valve 12 with liquid output pipe road；Drain valve 3 is by pipeline with entering
Pipeline between mouthful stop valve 2 and quick action emergency valve 5 is connected, and heating gas stop valve 10 is by pipeline and liquid expander 6 and goes out
Pipeline is connected between mouth stop valve 12, and tapping valve 11 passes through pipeline phase between pipeline and liquid expander 6 and outlet shutoff valve 12
Even, liquid expander 6 is also associated with blow through valve 9.The both ends of quick action emergency valve 5 are parallel with quick action emergency valve by-passing valve 4.Liquid is swollen
Swollen machine 6 is connected through reduction box 7 with generator 8 (or power-equipment), or directly (or power is set liquid expander 6 with generator 8
It is standby) it is connected, liquid expander 6 and quick action emergency valve 5 are arranged in ice chest 13.
The closing method of liquid expander in cryogenic air separation plant based on said system, liquid expansion is slowly turned down first
Machine nozzle aperture, while big liquid choke valve is slowly driven, both synergic adjustments maintain the stabilization of supercharger outlet pressure；Treat liquid
After nozzle of expansion machine completely closes, quick action emergency valve is closed, so that liquid expander unit is steadily stopped transport；It is then switched off liquid
Expanding machine imports and exports stop valve, opens liquid expander inlet pipeline drain valve, outlet conduit tapping valve, blow through valve etc., excludes
Liquid in expanding machine and in pipeline；Liquid expander and its pipeline are finally heated up to environment temperature using purified air.Specifically
Operating procedure is as follows：
1) progressively turn down liquid expander nozzle aperture, while open the aperture of big liquid choke valve, both cooperate with
Maintain supercharger final stage outlet pressure stable, the shaft power that liquid expander exports progressively is reduced.
2) while liquid expander nozzle aperture is turned down, big throttle valve opening is opened, makes liquid expander rotating speed gradual
Reduce.After nozzle of expansion machine completely closes, quick action emergency valve is closed, so that expanding machine set steady is stopped transport.
3) stop valve on closing liquid expanding machine inlet and outlet pipeline, opens inlet pipeline drain valve, outlet conduit discharge opeing
Valve and blow through valve, exclude in liquid expander and its import and export liquid in pipeline.
It is described in detail with reference to Fig. 1.Fig. 1 be the present invention a kind of cryogenic air separation plant in liquid expander stop
Machine embodiment of the method block diagram.Liquid expander closing method disclosed by the invention, the nozzle of liquid expander 6 is gradually turned down first
Aperture, while on the premise of maintaining supercharger outlet pressure stable, the aperture of liquid choke valve 1 is slowly opened greatly, until liquid
The nozzle of expanding machine 6 completely closes, and closes quick action emergency valve 5 immediately, liquid expander unit is steadily stopped transport；Then, close
The inlet stop valve 2 and outlet shutoff valve 12 of liquid expander, drain valve 3, tapping valve 11 and blow through valve 9 etc. are opened, excluded
Residual liquid in liquid expander 6 and its pipeline；Finally, heating gas stop valve 10 is opened, is expanded liquid using purified air
Machine 6 and its pipeline are heated up to environment temperature.Concrete operation step is as follows：
First, it is gradually reduced the load of liquid expander 6.While the nozzle aperture of liquid expander 6 is turned down, slowly increase
The aperture of liquid feeding body choke valve 1, and maintain the stable outlet pressure of supercharger.Make the load of liquid expander 6 in this way (i.e.
The shaft power of output) progressively reduce.
Second, close quick action emergency valve 5.As the aperture of liquid choke valve 1 gradually increases, the nozzle of liquid expander 6 is opened
Degree gradually turns down, and the rotating speed of liquid expander 6 gradually reduces, and when the nozzle of liquid expander 6 completely closes, closes emergency cut-off
Valve 5, expanding machine unit is set steadily to stop transport.
3rd, liquid expander 6 and inlet and outlet pipeline discharge opeing.Inlet stop valve 2 and outlet shutoff valve 12 are closed, is passed through
Drain valve 3 excludes inlet pipeline liquid；By blow through valve 9 and tapping valve 11, exclude in the main frame of liquid expander 6 and outlet conduit
Liquid.
4th, heated liquid expanding machine 6 to environment temperature.Blow through valve 9 and tapping valve 11 are closed, opens heating gas stop valve
10th, the nozzle of liquid expander 6 and quick action emergency valve 5, purified gas is introduced into above-mentioned part makes purified air reversely sequentially enter
The diffuser pipe of liquid expander 6, impeller, nozzle, spiral case and its import component are simultaneously discharged by drain valve 3, until liquid expander 6
Internal and its inlet and outlet pipeline indicates that cryogenic liquid expanding machine is steadily shut down close to environment temperature.
5th, the automation of stopping process is implemented.By Integration ofTechnologies such as said process and Automated condtrols, it is possible to achieve liquid
Volume expansion machine shut down Automated condtrol, efficiently, precisely, smoothly complete whole handoff procedure.
Above-described embodiment is merely to illustrate the present invention without limiting the scope of the invention, all according to patent institute of the present invention
The modification of content improvements introduced and the equivalent form of value is stated, should not be excluded outside the scope of patent protection of the present invention.
Claims (7)
- A kind of 1. cryogenic liquid expanding machine shutdown system, it is characterised in that including liquid expander (6), liquid choke valve (1), Drain valve (3), gas stop valve (10) and tapping valve (11) are heated, entrance is provided with the inlet duct of liquid expander (6) Stop valve (2) and quick action emergency valve (5), outlet shutoff valve (12) are provided with the outlet conduit of liquid expander (6), liquid is swollen Liquid choke valve (1), and inlet stop valve (2) and liquid throttling are parallel with the inlet duct and outlet conduit of swollen machine (6) The entrance of valve (1) is connected with liquid input tube road, and the outlet of liquid choke valve (1) and outlet shutoff valve (12) is defeated with liquid Go out pipeline to be connected；Drain valve (3) is connected by the pipeline between pipeline and inlet stop valve (2) and quick action emergency valve (5), heating Gas stop valve (10) is connected by pipeline between pipeline and liquid expander (6) and outlet shutoff valve (12), and tapping valve (11) is logical Pipeline is connected between piping and liquid expander (6) and outlet shutoff valve (12), and liquid expander (6) is also associated with blow through valve (9)。
- A kind of 2. cryogenic liquid expanding machine shutdown system according to claim 1, it is characterised in that liquid expander (6) Directly it is connected with generator (8) or power-equipment.
- A kind of 3. cryogenic liquid expanding machine shutdown system according to claim 1, it is characterised in that liquid expander (6) It is connected through reduction box (7) with generator (8) or power-equipment.
- A kind of 4. cryogenic liquid expanding machine shutdown system according to claim 1, it is characterised in that liquid expander (6) It is arranged at quick action emergency valve (5) in ice chest (13).
- 5. a kind of cryogenic liquid expanding machine closing method based on system described in claim 1, it is characterised in that turn down liquid first Volume expansion machine nozzle aperture, while big liquid choke valve is driven, both synergic adjustments maintain the stabilization of supercharger outlet pressure；Treat liquid After volume expansion machine nozzle completely closes, quick action emergency valve is closed, so that liquid expander unit is steadily stopped transport；It is then switched off liquid Volume expansion machine imports and exports stop valve, opens liquid expander inlet pipeline drain valve, outlet conduit tapping valve and blow through valve, row Except liquid in expanding machine and in pipeline；Liquid expander and its pipeline are finally heated up to environment temperature using purified air.
- 6. cryogenic liquid expanding machine closing method according to claim 5, it is characterised in that comprise the following steps that：First, while the nozzle aperture of liquid expander (6) is turned down, the aperture of liquid choke valve (1) is slowly increased, and tie up The stable outlet pressure of supercharger is held, the load of liquid expander (6) is progressively reduced in this way；Second, as liquid choke valve (1) aperture gradually increases, the nozzle aperture of liquid expander (6) gradually turns down, liquid is swollen The rotating speed of swollen machine (6) gradually reduces, and when liquid expander (6) nozzle completely closes, closes quick action emergency valve (5), makes expansion Machine unit is steadily stopped transport；3rd, inlet stop valve (2) and outlet shutoff valve (12) are closed, inlet pipeline liquid is excluded by drain valve (3)；It is logical Blow through valve (9) and tapping valve (11) are crossed, excludes liquid in liquid expander main frame and outlet conduit；4th, blow through valve (9) and tapping valve (11) is closed, opens heating gas stop valve (10), liquid expander nozzle and tightly Anxious stop valve (5), purified gas is introduced into above-mentioned part and discharged by drain valve (3), until inside liquid expander and its entering Outlet conduit indicates that cryogenic liquid expanding machine is steadily shut down close to environment temperature.
- 7. cryogenic liquid expanding machine closing method according to claim 6, it is characterised in that open heating gas stop valve (10), quick action emergency valve (5) and drain valve (3), purified air is reversely sequentially entered liquid expander diffuser pipe, impeller, Nozzle, spiral case and its import component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711058762.7A CN107860171A (en) | 2017-11-01 | 2017-11-01 | A kind of cryogenic liquid expanding machine shutdown system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711058762.7A CN107860171A (en) | 2017-11-01 | 2017-11-01 | A kind of cryogenic liquid expanding machine shutdown system and method |
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| CN107860171A true CN107860171A (en) | 2018-03-30 |
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| CN201711058762.7A Pending CN107860171A (en) | 2017-11-01 | 2017-11-01 | A kind of cryogenic liquid expanding machine shutdown system and method |
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2017
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Application publication date: 20180330 |