CN103822417B - Single-stage mixing cryogen natural gas liquefaction flow process cryogen concentration control system - Google Patents
Single-stage mixing cryogen natural gas liquefaction flow process cryogen concentration control system Download PDFInfo
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- CN103822417B CN103822417B CN201410054854.8A CN201410054854A CN103822417B CN 103822417 B CN103822417 B CN 103822417B CN 201410054854 A CN201410054854 A CN 201410054854A CN 103822417 B CN103822417 B CN 103822417B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 239000003345 natural gas Substances 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000008569 process Effects 0.000 title claims abstract description 17
- 238000002156 mixing Methods 0.000 title claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 38
- 239000003507 refrigerant Substances 0.000 claims abstract description 22
- 239000003949 liquefied natural gas Substances 0.000 claims abstract description 19
- 230000008676 import Effects 0.000 claims abstract description 10
- 238000009835 boiling Methods 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 20
- 230000008859 change Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
Classifications
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0211—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle
- F25J1/0212—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a single flow MCR cycle
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0022—Hydrocarbons, e.g. natural gas
-
- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
- F25J1/0052—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream
-
- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0244—Operation; Control and regulation; Instrumentation
-
- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
- F25J1/0291—Refrigerant compression by combined gas compression and liquid pumping
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention discloses a kind of single-stage mixing cryogen natural gas liquefaction flow process cryogen concentration control system, wherein control unit comprises the first controller, second controller, the 3rd controller and the 4th controller; First controller is by gathering the rotating speed of ice chest heat exchange unit temperature end heat transfer temperature difference as feedback signal adjustment first order frequency conversion liquor pump; Second controller is by gathering the rotating speed of ice chest heat exchange unit low-temperature end heat transfer temperature difference as feedback signal adjustment second level frequency conversion liquor pump; 3rd controller regulates the rotating speed of first order frequency-changeable compressor and second level frequency-changeable compressor as feedback signal by the import and export temperature difference that gathers liquefied natural gas dropping valve; 4th controller regulates the aperture of controlled J-T restricting element as feedback signal by collection controlled J-T restricting element outlet refrigerant pressure.Cryogen of the present invention fills concentration can be changed within the specific limits, and this system can regulate the operation concentration of cryogen automatically according to operating condition, ensure that its efficient stable runs.
Description
Technical field
The present invention relates to compression and the liquefaction of gas, be specifically related to single-stage mixing cryogen natural gas liquefaction flow process cryogen concentration control system.
Background technology
Because the liquid phase of non-azeotrope azeotrope is accumulated, the operation cryogen concentration of azeotrope refrigeration system and required filled concentration are differed greatly, how filling cryogen according to the operation concentration optimized is a difficult point in all non-azeotrope refrigeration systems.
Single-stage mixing cryogen (SMR) natural gas liquefaction flow process generally adopts multi-stage compression, five kinds of component mixed working fluid (N
2/ CH
4/ C
2h
4/ C
3h
8/ iC
5h
12) freeze.SMR technological process is simple, is widely used in middle-size and small-size natural gas liquefaction station.
The operation of azeotrope natural gas liquefaction flow process is very complicated, and when the condensation temperature change of azeotrope, for ensureing the safe operation of flow process, the concentration of liquefaction flow path cryogen also should corresponding change.In actual motion, the change of this concentration is very difficult.When needing the concentration increasing a kind of component, except will filling this component cryogen, also should release other component cryogens of part, thus the total amount of cryogen in guarantee system, to keep operating pressure.Therefore this way changing cryogen operation concentration by becoming filled cryogen amount is difficult to realize.During current natural gas liquefaction system runs, under often making the condensation temperature of cryogen remain on a higher temperature, thus ensure the stable operation of system conditions.Such as, when the environment temperature decreases, the cooling water flow in reduction condenser or air mass flow is adopted to make condensation temperature keep constant.But this operating scheme have lost the cooling potentiality of environment, adds a large amount of energy consumption.
Summary of the invention
Fill difficulty to overcome single-stage mixing cryogen natural gas liquefaction system cryogen and determine the large deficiency of operating mode operation energy consumption at present, the invention provides single-stage mixing cryogen natural gas liquefaction flow process cryogen concentration control system.
The present invention adopts following technological means:
A kind of single-stage mixing cryogen natural gas liquefaction flow process cryogen concentration control system, comprises ice chest heat exchange unit, liquefied natural gas dropping valve, controlled J-T restricting element, first order frequency-changeable compressor, first order gas-liquid separator, second level frequency-changeable compressor, second level gas-liquid separator, first order frequency conversion liquor pump, second level frequency conversion liquor pump, surge tank, first order cooler, second-stage cooler and control unit;
Described control unit comprises the first controller, second controller, the 3rd controller and the 4th controller;
Described first controller is by gathering the rotating speed of ice chest heat exchange unit temperature end heat transfer temperature difference as feedback signal adjustment first order frequency conversion liquor pump;
Described second controller is by gathering the rotating speed of ice chest heat exchange unit low-temperature end heat transfer temperature difference as feedback signal adjustment second level frequency conversion liquor pump;
Described 3rd controller regulates the rotating speed of first order frequency-changeable compressor and second level frequency-changeable compressor as feedback signal by the import and export temperature difference that gathers liquefied natural gas dropping valve;
Described 4th controller regulates the aperture of controlled J-T restricting element as feedback signal by collection controlled J-T restricting element outlet refrigerant pressure.
Described first controller is by gathering the rotating speed of ice chest heat exchange unit temperature end heat transfer temperature difference as feedback signal adjustment first order frequency conversion liquor pump, be specially: if ice chest heat exchange unit temperature end heat transfer temperature difference is higher than preset value, then reduce the rotating speed of first order frequency conversion liquor pump, reduce the flow of high boiling component, otherwise, then improve the rotating speed of first order frequency conversion liquor pump, increase the flow of higher boiling refrigerant components.
Described second controller is by gathering the rotating speed of ice chest heat exchange unit low-temperature end heat transfer temperature difference as feedback signal adjustment second level frequency conversion liquor pump, be specially: if ice chest heat exchange unit low-temperature end heat transfer temperature difference is higher than preset value, then improve the rotating speed of second level frequency conversion liquor pump, the flow of warm boiling point refrigerant components in increase, otherwise, then reduce the rotating speed of second level frequency conversion liquor pump, the flow of warm boiling point refrigerant components in minimizing.
Described 3rd controller regulates the rotating speed of first order frequency-changeable compressor and second level frequency-changeable compressor by the import and the outlet temperature difference gathering liquefied natural gas dropping valve as feedback signal; Be specially: if the import and export temperature difference of liquefied natural gas dropping valve is higher than preset value, then improve the rotating speed of first order frequency-changeable compressor and second level frequency-changeable compressor, increase cryogen flow, otherwise, then reduce the rotating speed of first order frequency-changeable compressor and second level frequency-changeable compressor, reduce cryogen flow.
Beneficial effect of the present invention:
Lower to the filled concentration requirement of cryogen, self-checking device can regulate cryogen to run concentration according to the heat transfer temperature difference of its ice chest heat exchange unit temperature end and low-temperature end automatically, ensure that SMR flow process efficient stable under different operating mode runs, and control device is simple, easily realizes.
Accompanying drawing explanation
Fig. 1 is single-stage mixing cryogen natural gas liquefaction flow process cryogen concentration control system structural representation.
Shown in figure:
1-ice chest heat exchange unit, 2-controlled J-T restricting element, 3-surge tank, 4-first order frequency-changeable compressor, 5-first order cooler, 6-first order gas-liquid separator, 7-second level frequency-changeable compressor, 8-second-stage cooler, 9-second level gas-liquid separator, 10-first order frequency conversion liquor pump, 11-second level frequency conversion liquor pump, 12-liquefied natural gas dropping valve, 13-control unit, 14-first controller, 15-second controller, 16-the 3rd controller, the 17-the four controller;
Wherein, straight line represents the stream of cryogen and natural gas working medium, and dotted line represents that signal inputs, and chain-dotted line represents that control instruction exports.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, the present invention includes surge tank 3, first order cooler 5, second-stage cooler 8, ice chest heat exchange unit 1, liquefied natural gas dropping valve 12, controlled J-T restricting element 2, first order frequency-changeable compressor 4, first order gas-liquid separator 6, second level frequency-changeable compressor 7, second level gas-liquid separator 9, first order frequency conversion liquor pump 10, second level frequency conversion liquor pump 11 and control unit 13.
Liquid in described first order gas-liquid separator 6 is rich in higher boiling refrigerant components; The liquid that second level gas-liquid separator 9 is separated is rich in middle temperature boiling point refrigerant components, and the content of low boiling refrigerant components is higher in its gas be separated, the first order, second level frequency conversion liquor pump 10 are set at the bottom of two gas-liquid separator stills, 11, by regulating the liquid phase stream flow of its correspondence of rotational speed regulation of first, second grade of frequency conversion liquor pump 10,11 thus the operation concentration of cryogen in regulating system.
Described control unit 13 comprises the first controller 14, second controller 15, the 3rd controller 16 and the 4th controller 17;
Described first controller 14 is by gathering the rotating speed of ice chest heat exchange unit 1 temperature end heat transfer temperature difference as feedback signal adjustment first order frequency conversion liquor pump 10;
Described second controller 15 is by gathering the rotating speed of ice chest heat exchange unit 1 low-temperature end heat transfer temperature difference as feedback signal adjustment second level frequency conversion liquor pump 11;
The import and export temperature difference that described 3rd controller 16 passes through to gather liquefied natural gas dropping valve 12 regulates the rotating speed of first order frequency-changeable compressor 4 and second level frequency-changeable compressor 7 as feedback signal;
Described 4th controller 17 exports by gathering controlled J-T restricting element 2 refrigerant pressure regulates controlled J-T restricting element 2 aperture as feedback signal.
In SMR flow process, first arrange the control temperature difference of ice chest heat exchange unit 1 temperature end, as 5 DEG C, the control temperature difference of low-temperature end, as 7 DEG C, controls the temperature difference before and after liquefied natural gas dropping valve 12, and as 5 DEG C, the outlet refrigerant pressure of controlled J-T restricting element 2, as 3bar.
After system is normally run, cryogen enters first order frequency-changeable compressor 4 by surge tank 3, after first order compression, pressure, temperature raise, enter first order cooler 5, after cooling, its temperature is close to environment temperature, higher boiling refrigerant components is condensed into liquid, enters first order gas-liquid separator 6, and the liquid separated squeezes into ice chest heat exchange unit 1 by first order frequency conversion liquor pump 10, gas fraction enters second level frequency-changeable compressor 7 and continues compression, pressure, temperature raises once again, enter second-stage cooler 8, after cooling, refrigerant temperature is close to environment temperature, wherein mid-boiling point refrigerant components is condensed into liquid, cryogen enters second level gas-liquid separator 9, the liquid separated squeezes into ice chest heat exchange unit 1 through second level frequency conversion liquor pump 11, gas fraction then directly enters ice chest heat exchange unit 1, the further condensation of cryogen in ice chest heat exchange unit 1 is also excessively cold, then through controlled J-T restricting element 2 reducing pressure by regulating flow, cooling, its pressure, temperature enters the cold junction of ice chest heat exchange unit after reducing, it is overheated to evaporate after absorbing heat, return in surge tank 3, complete a circulation.
High-pressure natural gas CNG directly enters ice chest heat exchange unit 1, cross wherein cold after enter liquefied natural gas dropping valve 12 step-down, Pressure Drop is to preserving close to entering in LNG fluid reservoir after an atmospheric pressure.
Described first controller 14 is by gathering the rotating speed of ice chest heat exchange unit 1 temperature end heat transfer temperature difference as feedback signal adjustment first order frequency conversion liquor pump 10, be specially: if ice chest heat exchange unit temperature end heat transfer temperature difference is higher than preset value, then reduce the rotating speed of first order frequency conversion liquor pump 10, reduce the flow of high boiling component, otherwise, then improve the rotating speed of first order frequency conversion liquor pump 10, increase the flow of higher boiling refrigerant components.
Described second controller 15 is by gathering the rotating speed of ice chest heat exchange unit 1 low-temperature end heat transfer temperature difference as feedback signal adjustment second level frequency conversion liquor pump 11, be specially: if ice chest heat exchange unit low-temperature end heat transfer temperature difference is higher than preset value, then improve the rotating speed of second level frequency conversion liquor pump 11, the flow of warm boiling point refrigerant components in increase, otherwise, then reduce the rotating speed of second level frequency conversion liquor pump 11, the flow of warm boiling point refrigerant components in minimizing.
Described 3rd controller 16 regulates the rotating speed of first order frequency-changeable compressor 4 and second level frequency-changeable compressor 7 by the import and the outlet temperature difference gathering liquefied natural gas dropping valve 12 as feedback signal, be specially: if the import and export temperature difference of liquefied natural gas dropping valve 12 is higher than preset value, then improve the rotating speed of first order frequency-changeable compressor 4 and second level frequency-changeable compressor 7, increase cryogen flow, otherwise, then reduce the rotating speed of first order frequency-changeable compressor 4 and second level frequency-changeable compressor 7, reduce cryogen flow.
Described 4th controller 17 exports by gathering controlled J-T restricting element 2 refrigerant pressure regulates controlled J-T restricting element 2 aperture as feedback signal, be specially: when controlled J-T restricting element 2 exports refrigerant pressure higher than preset value, then reduce its aperture, otherwise, then increase its aperture.
In whole system is run, the temperature drop of liquefied natural gas before and after liquefied natural gas dropping valve 12 can not be too large, otherwise after its cooling, the amount of flashed vapour is comparatively large, and for reaching this effect, natural gas must be down to certain temperature (generally below-155 DEG C) in ice chest heat exchange unit; In addition, in ice chest heat exchange unit, heat transfer temperature difference can not be too large, otherwise the loss of system is large, and energy consumption increases; Adopt the present invention can overcome above-mentioned defect.
The present invention chooses the two-stage in the multi-stage compression cooling unit of cryogen, after its cooler, arrange gas-liquid separator, cryogen is separated into two stocks and is not rich in the liquid phase stream of high boiling component and mid-boiling point component and is rich in the vapor phase stream of low boiling component; On regulative mode, 1) change cryogen by adjustment two strands of liquid phase stream flows and run concentration thus the heat transfer temperature difference ensureing ice chest heat exchange unit hot junction and cold junction, 2) by regulating compressor rotary speed to change refrigerating capacity thus ensureing that variable load rate runs, 3) by regulating cryogen JT throttle valve opening to keep low pressure to stablize.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not limited by the examples; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (4)
1. a single-stage mixing cryogen natural gas liquefaction flow process cryogen concentration control system, it is characterized in that, comprise ice chest heat exchange unit, liquefied natural gas dropping valve, controlled J-T restricting element, first order frequency-changeable compressor, first order gas-liquid separator, second level frequency-changeable compressor, second level gas-liquid separator, first order frequency conversion liquor pump, second level frequency conversion liquor pump, surge tank, first order cooler, second-stage cooler and control unit;
Described control unit comprises the first controller, second controller, the 3rd controller and the 4th controller;
Described first controller is by gathering the rotating speed of ice chest heat exchange unit temperature end heat transfer temperature difference as feedback signal adjustment first order frequency conversion liquor pump;
Described second controller is by gathering the rotating speed of ice chest heat exchange unit low-temperature end heat transfer temperature difference as feedback signal adjustment second level frequency conversion liquor pump;
Described 3rd controller regulates the rotating speed of first order frequency-changeable compressor and second level frequency-changeable compressor as feedback signal by the import and export temperature difference that gathers liquefied natural gas dropping valve;
Described 4th controller regulates the aperture of controlled J-T restricting element as feedback signal by collection controlled J-T restricting element outlet refrigerant pressure.
2. a kind of single-stage mixing cryogen natural gas liquefaction flow process cryogen concentration control system according to claim 1, it is characterized in that, described first controller is by gathering the rotating speed of ice chest heat exchange unit temperature end heat transfer temperature difference as feedback signal adjustment first order frequency conversion liquor pump, be specially: if ice chest heat exchange unit temperature end heat transfer temperature difference is higher than preset value, then reduce the rotating speed of first order frequency conversion liquor pump, reduce the flow of high boiling component, otherwise, then improve the rotating speed of first order frequency conversion liquor pump, increase the flow of higher boiling refrigerant components.
3. a kind of single-stage mixing cryogen natural gas liquefaction flow process cryogen concentration control system according to claim 1, it is characterized in that, described second controller is by gathering the rotating speed of ice chest heat exchange unit low-temperature end heat transfer temperature difference as feedback signal adjustment second level frequency conversion liquor pump, be specially: if ice chest heat exchange unit low-temperature end heat transfer temperature difference is higher than preset value, then improve the rotating speed of second level frequency conversion liquor pump, the flow of warm boiling point refrigerant components in increase, otherwise, then reduce the rotating speed of second level frequency conversion liquor pump, the flow of warm boiling point refrigerant components in minimizing.
4. a kind of single-stage mixing cryogen natural gas liquefaction flow process cryogen concentration control system according to claim 1, it is characterized in that, described 3rd controller regulates the rotating speed of first order frequency-changeable compressor and second level frequency-changeable compressor by the import and the outlet temperature difference gathering liquefied natural gas dropping valve as feedback signal; Be specially: if the import and export temperature difference of liquefied natural gas dropping valve is higher than preset value, then improve the rotating speed of first order frequency-changeable compressor and second level frequency-changeable compressor, increase cryogen flow, otherwise, then reduce the rotating speed of first order frequency-changeable compressor and second level frequency-changeable compressor, reduce cryogen flow.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410054854.8A CN103822417B (en) | 2014-02-18 | 2014-02-18 | Single-stage mixing cryogen natural gas liquefaction flow process cryogen concentration control system |
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| CN201410054854.8A CN103822417B (en) | 2014-02-18 | 2014-02-18 | Single-stage mixing cryogen natural gas liquefaction flow process cryogen concentration control system |
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| CN103822417B true CN103822417B (en) | 2015-12-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6530240B1 (en) * | 2001-12-10 | 2003-03-11 | Gas Technology Institute | Control method for mixed refrigerant based natural gas liquefier |
| WO2012016166A1 (en) * | 2010-07-29 | 2012-02-02 | Fluor Technologies Corporation | Configurations and methods for small scale lng production |
| CN103162511B (en) * | 2013-01-27 | 2015-10-21 | 南京瑞柯徕姆环保科技有限公司 | A kind of natural gas constant-pressure liquefaction device |
| CN103245149A (en) * | 2013-05-23 | 2013-08-14 | 重庆耐德能源装备集成有限公司 | Mixed refrigerant circulation liquefied natural gas device and mixed refrigerant recovery device |
| CN203364521U (en) * | 2013-05-23 | 2013-12-25 | 重庆耐德能源装备集成有限公司 | Mixed refrigerant circulation liquefied natural gas device and mixed refrigerant recovery device |
| CN203824189U (en) * | 2014-02-18 | 2014-09-10 | 华南理工大学 | Refrigerant concentration control system for single-stage mixed refrigerant natural gas liquefaction process |
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