CN103822417A - Refrigerant concentration control system for single-stage mixed refrigerant natural gas liquefaction processes - Google Patents
Refrigerant concentration control system for single-stage mixed refrigerant natural gas liquefaction processes Download PDFInfo
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- CN103822417A CN103822417A CN201410054854.8A CN201410054854A CN103822417A CN 103822417 A CN103822417 A CN 103822417A CN 201410054854 A CN201410054854 A CN 201410054854A CN 103822417 A CN103822417 A CN 103822417A
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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
- 239000003507 refrigerant Substances 0.000 title abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 239000003949 liquefied natural gas Substances 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims description 36
- 238000009835 boiling Methods 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 11
- 230000008676 import Effects 0.000 claims description 9
- 230000006837 decompression Effects 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 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
- 238000013459 approach Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000498 cooling water Substances 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
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000926 separation method Methods 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
-
- 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
Landscapes
- 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 refrigerant concentration control system for single-stage mixed refrigerant natural gas liquefaction processes. The refrigerant concentration control system is characterized in that a control unit of the refrigerant concentration control system comprises a first controller, a second controller, a third controller and a fourth controller; heat exchange temperature difference of high-temperature ends of a cold box heat exchange unit is acquired by the first controller and is used as a feedback signal for adjusting the rotational speed of a primary variable-frequency liquid pump; heat exchange temperature difference of low-temperature ends of the cold box heat exchange unit is acquired by the second controller and is used as a feedback signal for adjusting the rotational speed of a secondary variable-frequency liquid pump; inlet and outlet temperature difference of a liquefied natural gas decompression valve is acquired by the third controller and is used as a feedback signal for adjusting the rotational speed of a primary variable-frequency compressor and the rotational speed of a secondary variable-frequency compressor; the refrigerant pressure at an outlet of a controllable J-T (Joule-Thomson) throttling element is acquired by the fourth controller and is used as a feedback signal for adjusting the opening of the controllable J-T throttling element. The refrigerant concentration control system has the advantages that the refrigerant filling concentration can be varied within a certain range, the refrigerant running concentration can be automatically adjusted by the system according to running working conditions, and accordingly efficient and stable running of the refrigerant concentration control system can be guaranteed.
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-vapor of mixture cryogen is accumulated, the operation cryogen concentration of azeotrope refrigeration system and required filled concentration are differed greatly, how to fill cryogen according to the operation concentration of optimizing is a difficult point in all non-azeotropic 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 in the time that the condensation temperature of azeotrope changes, for guaranteeing the safe operation of flow process, the concentration of liquefaction flow path cryogen also should corresponding change.In actual motion, the variation of this concentration is very difficult.When increasing a kind of concentration of component, except will filling this component cryogen, also should release other component cryogens of part, thus the total amount of cryogen in assurance system, to keep operating pressure.Therefore this way that changes cryogen operation concentration by becoming filled cryogen amount is difficult to realize.Current natural gas liquefaction system is in service, often makes the condensation temperature of cryogen remain at a higher temperature, thereby guarantees the stable operation of system conditions.Such as, in the time that environment temperature reduces, adopt the cooling water flow or the air mass flow that reduce in condenser to make condensation temperature keep constant.But this operating scheme has lost the cooling potentiality of environment, has increased a large amount of energy consumptions.
Summary of the invention
Fill difficulty and determine at present the deficiency that operating mode operation energy consumption is large in order to overcome single-stage mixing cryogen natural gas liquefaction system cryogen, 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 module;
Described control module comprises the first controller, second controller, the 3rd controller and the 4th controller;
Described the first controller regulates the rotating speed of first order frequency conversion liquor pump as feedback signal by gathering ice chest heat exchange unit temperature end heat transfer temperature difference;
Described second controller regulates the rotating speed of second level frequency conversion liquor pump as feedback signal by gathering ice chest heat exchange unit low-temperature end heat transfer temperature difference;
Described the 3rd controller regulates the rotating speed of first order frequency-changeable compressor and second level frequency-changeable compressor as feedback signal by gathering the import and export temperature difference of liquefied natural gas dropping valve;
Described the 4th controller regulates the aperture of controlled J-T restricting element as feedback signal by gathering controlled J-T restricting element outlet cryogen pressure.
Described the first controller regulates the rotating speed of first order frequency conversion liquor pump as feedback signal by gathering ice chest heat exchange unit temperature end heat transfer temperature difference, be specially: if ice chest heat exchange unit temperature end heat transfer temperature difference is higher than preset value, reduce the rotating speed of first order frequency conversion liquor pump, reduce the flow of high boiling component, otherwise, improve the rotating speed of first order frequency conversion liquor pump, increase the flow of higher boiling cryogen component.
Described second controller regulates the rotating speed of second level frequency conversion liquor pump as feedback signal by gathering ice chest heat exchange unit low-temperature end heat transfer temperature difference, be specially: if ice chest heat exchange unit low-temperature end heat transfer temperature difference is higher than preset value, improve the rotating speed of second level frequency conversion liquor pump, the flow of warm boiling point cryogen component in increase, otherwise, reduce the rotating speed of second level frequency conversion liquor pump, the flow of warm boiling point cryogen component in minimizing.
Described the 3rd controller is by gathering the import and the rotating speed of the outlet temperature difference as feedback signal adjusting first order frequency-changeable compressor and second level frequency-changeable compressor of liquefied natural gas dropping valve; Be specially: if the import and export temperature difference of liquefied natural gas dropping valve is higher than preset value, improve the rotating speed of first order frequency-changeable compressor and second level frequency-changeable compressor, increase cryogen flow, otherwise, the rotating speed that reduces first order frequency-changeable compressor and second level frequency-changeable compressor, reduces cryogen flow.
Beneficial effect of the present invention:
Filled concentration requirement to cryogen is lower, self-checking device can regulate cryogen operation concentration automatically according to the heat transfer temperature difference of its ice chest heat exchange unit temperature end and low-temperature end, guarantee the efficient stable operation under different operating modes of SMR flow process, 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 module, 14-the 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 signal input, and chain-dotted line represents control instruction output.
The specific embodiment
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 to this.
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 module 13.
Liquid in described first order gas-liquid separator 6 is rich in higher boiling cryogen component; The liquid that second level gas-liquid separator 9 separates is rich in middle temperature boiling point cryogen component, and the content of low boiling cryogen component is higher in the gas of its separation, the first order, second level frequency conversion liquor pump 10 are set at the bottom of two gas-liquid separator stills, 11, by regulating first, second grade of frequency conversion liquor pump 10, thus the operation concentration of cryogen in its corresponding liquid phase stream flow regulating system of 11 rotational speed regulation.
Described control module 13 comprises the first controller 14, second controller 15, the 3rd controller 16 and the 4th controller 17;
Described the first controller 14 regulates the rotating speed of first order frequency conversion liquor pump 10 as feedback signal by gathering ice chest heat exchange unit 1 temperature end heat transfer temperature difference;
Described second controller 15 regulates the rotating speed of second level frequency conversion liquor pump 11 as feedback signal by gathering ice chest heat exchange unit 1 low-temperature end heat transfer temperature difference;
Described the 3rd controller 16 regulates the rotating speed of first order frequency-changeable compressor 4 and second level frequency-changeable compressor 7 as feedback signal by gathering the import and export temperature difference of liquefied natural gas dropping valve 12;
Described the 4th controller 17 exports cryogen pressure and regulates as feedback signal the aperture of controlled J-T restricting element 2 by gathering controlled J-T restricting element 2.
In SMR flow process, first the control temperature difference of ice chest heat exchange unit 1 temperature end is set, as 5 ℃, the control temperature difference of low-temperature end, as 7 ℃, the temperature difference is controlled in liquefied natural gas dropping valve 12 front and back, and as 5 ℃, the outlet cryogen pressure of controlled J-T restricting element 2, as 3bar.
After the normal operation of system, 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 approaches environment temperature, higher boiling cryogen components condense becomes liquid, enters first order gas-liquid separator 6, and the liquid of separating is squeezed into ice chest heat exchange unit 1 by first order frequency conversion liquor pump 10, gas part enters second level frequency-changeable compressor 7 and continues compression, pressure, temperature raises once again, enter second-stage cooler 8, cooling rear refrigerant temperature approaches environment temperature, wherein mid-boiling point cryogen components condense becomes liquid, cryogen enters second level gas-liquid separator 9, the liquid of separating is squeezed into ice chest heat exchange unit 1 through second level frequency conversion liquor pump 11, gas part directly enters ice chest heat exchange unit 1, the further condensation of cryogen excessively cold in ice chest heat exchange unit 1, then through controlled J-T restricting element 2 reducing pressure by regulating flows, cooling, its pressure, temperature enters the cold junction of ice chest heat exchange unit after reducing, it is overheated after absorption heat, to evaporate, return in surge tank 3, complete a circulation.
High-pressure natural gas CNG directly enters ice chest heat exchange unit 1, crosses after cold and enters 12 step-downs of liquefied natural gas dropping valve therein, and Pressure Drop enters in LNG fluid reservoir and preserves to approaching after an atmospheric pressure.
Described the first controller 14 regulates the rotating speed of first order frequency conversion liquor pump 10 as feedback signal by gathering ice chest heat exchange unit 1 temperature end heat transfer temperature difference, be specially: if ice chest heat exchange unit temperature end heat transfer temperature difference is higher than preset value, reduce the rotating speed of first order frequency conversion liquor pump 10, reduce the flow of high boiling component, otherwise, improve the rotating speed of first order frequency conversion liquor pump 10, increase the flow of higher boiling cryogen component.
Described second controller 15 regulates the rotating speed of second level frequency conversion liquor pump 11 as feedback signal by gathering ice chest heat exchange unit 1 low-temperature end heat transfer temperature difference, be specially: if ice chest heat exchange unit low-temperature end heat transfer temperature difference is higher than preset value, improve the rotating speed of second level frequency conversion liquor pump 11, the flow of warm boiling point cryogen component in increase, otherwise, reduce the rotating speed of second level frequency conversion liquor pump 11, the flow of warm boiling point cryogen component in minimizing.
Described the 3rd controller 16 is by gathering the import and the rotating speed of the outlet temperature difference as feedback signal adjusting first order frequency-changeable compressor 4 and second level frequency-changeable compressor 7 of liquefied natural gas dropping valve 12, be specially: if the import and export temperature difference of liquefied natural gas dropping valve 12 is higher than preset value, improve the rotating speed of first order frequency-changeable compressor 4 and second level frequency-changeable compressor 7, increase cryogen flow, otherwise, the rotating speed that reduces first order frequency-changeable compressor 4 and second level frequency-changeable compressor 7, reduces cryogen flow.
Described the 4th controller 17 exports cryogen pressure and regulates as feedback signal the aperture of controlled J-T restricting element 2 by gathering controlled J-T restricting element 2, be specially: when controlled J-T restricting element 2 exports cryogen pressure higher than preset value, reduce its aperture, otherwise, its aperture increased.
In service in whole system, liquefied natural gas can not be too large at the temperature drop of liquefied natural gas dropping valve 12 front and back, otherwise after its cooling, the amount of flashed vapour is larger, and for reaching this effect, natural gas must be down to certain temperature (generally below-155 ℃) 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, gas-liquid separator is set, and 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) thus guarantee the heat transfer temperature difference of ice chest heat exchange unit hot junctions and cold junction by regulating two strands of liquid phase stream flows to change cryogens operation concentration, 2) thus guarantee the operation of varying duty rate, 3 by regulating compressor rotary speed to change refrigerating capacity) by regulating cryogen JT throttle valve opening to keep low pressure stable.
Above-described embodiment is preferably embodiment of the present invention; but embodiments of the present invention are not limited by the examples; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in 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 module;
Described control module comprises the first controller, second controller, the 3rd controller and the 4th controller;
Described the first controller regulates the rotating speed of first order frequency conversion liquor pump as feedback signal by gathering ice chest heat exchange unit temperature end heat transfer temperature difference;
Described second controller regulates the rotating speed of second level frequency conversion liquor pump as feedback signal by gathering ice chest heat exchange unit low-temperature end heat transfer temperature difference;
Described the 3rd controller regulates the rotating speed of first order frequency-changeable compressor and second level frequency-changeable compressor as feedback signal by gathering the import and export temperature difference of liquefied natural gas dropping valve;
Described the 4th controller regulates the aperture of controlled J-T restricting element as feedback signal by gathering controlled J-T restricting element outlet cryogen 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 the first controller regulates the rotating speed of first order frequency conversion liquor pump as feedback signal by gathering ice chest heat exchange unit temperature end heat transfer temperature difference, be specially: if ice chest heat exchange unit temperature end heat transfer temperature difference is higher than preset value, reduce the rotating speed of first order frequency conversion liquor pump, reduce the flow of high boiling component, otherwise, improve the rotating speed of first order frequency conversion liquor pump, increase the flow of higher boiling cryogen component.
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 regulates the rotating speed of second level frequency conversion liquor pump as feedback signal by gathering ice chest heat exchange unit low-temperature end heat transfer temperature difference, be specially: if ice chest heat exchange unit low-temperature end heat transfer temperature difference is higher than preset value, improve the rotating speed of second level frequency conversion liquor pump, the flow of warm boiling point cryogen component in increase, otherwise, reduce the rotating speed of second level frequency conversion liquor pump, the flow of warm boiling point cryogen component 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 the 3rd controller is by gathering the import and the rotating speed of the outlet temperature difference as feedback signal adjusting first order frequency-changeable compressor and second level frequency-changeable compressor of liquefied natural gas dropping valve; Be specially: if the import and export temperature difference of liquefied natural gas dropping valve is higher than preset value, improve the rotating speed of first order frequency-changeable compressor and second level frequency-changeable compressor, increase cryogen flow, otherwise, the rotating speed that reduces first order frequency-changeable compressor and second level frequency-changeable compressor, reduces cryogen flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN103822417A true CN103822417A (en) | 2014-05-28 |
| CN103822417B CN103822417B (en) | 2015-12-09 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003050459A1 (en) * | 2001-12-10 | 2003-06-19 | Gas Technology Institute | Control method for mixed refrigerant based natural gas liquefier |
| CN103162511A (en) * | 2013-01-27 | 2013-06-19 | 南京瑞柯徕姆环保科技有限公司 | Natural gas constant-pressure liquefaction device |
| CN103229011A (en) * | 2010-07-29 | 2013-07-31 | 氟石科技公司 | Configurations and methods for small scale lng production |
| 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 |
-
2014
- 2014-02-18 CN CN201410054854.8A patent/CN103822417B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003050459A1 (en) * | 2001-12-10 | 2003-06-19 | Gas Technology Institute | Control method for mixed refrigerant based natural gas liquefier |
| CN103229011A (en) * | 2010-07-29 | 2013-07-31 | 氟石科技公司 | Configurations and methods for small scale lng production |
| CN103162511A (en) * | 2013-01-27 | 2013-06-19 | 南京瑞柯徕姆环保科技有限公司 | 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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| CN103822417B (en) | 2015-12-09 |
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