CN202973761U - Double composite cryogen refrigerating system with pre-cooling - Google Patents
Double composite cryogen refrigerating system with pre-cooling Download PDFInfo
- Publication number
- CN202973761U CN202973761U CN 201220647616 CN201220647616U CN202973761U CN 202973761 U CN202973761 U CN 202973761U CN 201220647616 CN201220647616 CN 201220647616 CN 201220647616 U CN201220647616 U CN 201220647616U CN 202973761 U CN202973761 U CN 202973761U
- Authority
- CN
- China
- Prior art keywords
- precooling
- cryogen
- heat exchanger
- natural gas
- precooling agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Separation By Low-Temperature Treatments (AREA)
Abstract
The utility model discloses a double composite cryogen refrigerating system with pre-cooling. Temperature of purification natural gas in four evaporators and two heat exchangers is gradually lowered until the purification natural gas is liquefied. Cooling capacity needed in the liquefying process is provided by a pre-cryogen system, a mixed cryogen MR1 system and a mixed cryogen MR2 system, adjustment methods of the systems are multiple, the matched cooling capacity can be provided for the liquefying process of the natural gas, and therefore the double composite cryogen refrigerating system is flexible to operate and adapts to raw materials. The double composite cryogen refrigerating system has the advantages that energy consumption is low in the liquefying process of the natural gas, large-scale liquefying factory domestication is free from limitation of the form of a main heat exchanger, and a liquefied natural gas (LNG) device of ten million tons to the maximum can be achieved by adopting the double composite cryogen refrigerating system in large-scale refrigeration compression.
Description
Technical field
The utility model relates to a kind of two compound cryogen refrigeration system with precooling.
Background technology
LNG has the performance of clean environment firendly, is promoting rapidly without many applications such as Small Urban gas, industrial fuel, gas peak regulation and the accident emergency of natural gas line arrival area, gas combustion automobile, high-grade porcelain processing.But be subject to the impact of International Crude Oil, Gas Prices is constantly soaring, and natural gas liquefaction plant's benefit natural gas liquefaction plant cost of material constantly increases, thereby causes the liquefaction plant profit margin constantly to descend.Recent domestic natural gas liquefaction plant is to maximization, scale future development, and the maximum liquefying power of single cover has arrived 7,800,000 ton/years at present.Energy consumption is low, construction cost is relatively low, can be applied to again the developing direction that large-scale liquefaction process is China's liquefaction technology in future.
Natural gas liquefaction process is broadly divided into following three kinds both at home and abroad at present:
1) stepwise kind of refrigeration cycle; 2) azeotrope kind of refrigeration cycle is subdivided into again single-stage mixing cryogen circulation and the circulation of multistage azeotrope with or without precooling; 3) swell refrigeration is subdivided into again single-stage expansion refrigeration and multiple expansion refrigeration with or without precooling.
Above technique is adapted to the natural gas liquefaction plant of different disposal scale because of characteristics separately.Natural gas liquefaction process with the swell refrigeration circulation is too high because of plant energy consumption, and single covering device treating capacity is little, is substituted by the mixing cryogen refrigerating cycle liquefied technology of single-stage gradually in recent years.Single-stage mixing cryogen refrigerating cycle liquefied technique is present domestic and international 50 * 10
4The main flow technique of the liquefaction factory of the following treatment scale of t/a.And greater than 50 * 10
4Mixing cryogen refrigerating cycle liquefied technique and multistage azeotrope refrigeration liquefying flow path with precooling that the liquefied natural gas (LNG) plant of t/a is all selected.
As seen from the above analysis, can be applicable to large-scale or the ultra-large type natural gas liquefaction process with the mixing cryogen refrigerating cycle liquefied technique (C3/MRC) of propane pre-cooling, multistage azeotrope refrigeration liquefying flow path and stage refrigerating cycle liquefaction flow process.
The utility model content
The utility model has overcome shortcoming of the prior art, a kind of two compound cryogen refrigeration system with precooling is provided, adopt two azeotrope refrigeration of the pre-cold-peace of precooling agent, natural gas, azeotrope MR1, azeotrope MR2 are cooled in precooling agent in chilldown system, and the precooling agent of four different operating pressure is vaporized and heat exchange in four different precool heat exchanger devices; Enter the main cryogenic heat exchanger liquefaction of liquefaction from precool heat exchanger device natural gas, azeotrope MR1 and azeotrope MR2 out, cold is provided by azeotrope MR1 throttling; Entered cold main cryogenic heat exchanger from main cryogenic heat exchanger natural gas, the azeotrope MR2 out that liquefy excessively cold.Liquefaction and cross cold main cryogenic heat exchanger and composed in parallel by some plate-fin heat exchange units, raw natural gas liquefaction and cross and be chilled to-150 ℃～-163 ℃ crossing cold heat exchanger in the liquefaction heat exchanger, then throttling enters the LNG storage tank.
The technical solution of the utility model is: a kind of two compound cryogen refrigeration system with precooling comprises the precooling agent chilldown system that is connected and composed successively by multi-stage precooling agent evaporimeter, precooling agent compressor, precooling agent cooler and precooling agent separator; The mix refrigerant MR1 refrigeration system that is connected and composed successively by MR1 compressor, MR1 cooler, multi-stage precooling agent evaporimeter and the main cryogenic heat exchanger that liquefies; By MR2 compressor, MR2 cooler, multi-stage precooling agent evaporimeter, the main cryogenic heat exchanger that liquefies, cross the mix refrigerant MR2 refrigeration system that cold main cryogenic heat exchanger and MR2 separator connect and compose successively.
Compared with prior art, the utility model has the advantages that:
Purified natural gas temperature in four evaporimeters and two heat exchangers reduces gradually, until liquefaction; The required cold of liquefaction process is provided by precooling agent, azeotrope MR1, azeotrope MR2 three systems, system's regulating measure is abundant, can be for gas deliquescence process provide the cold that is complementary, thus embody this patent in operational flexibility with to the adaptability of raw material.Compared with prior art, have the following advantages:
1, the gas deliquescence process energy consumption is low:
For natural gas liquefaction, the principal element that affects energy consumption is the heat transfer temperature difference of cryogenic temperature and refrigeration heat transfer process.Under identical cryogenic temperature operating mode, heat transfer temperature difference is larger, and the energy consumption of refrigeration system is higher.
Adopt the two compound cryogen refrigeration system with precooling of the present utility model to carry out natural gas liquefaction, the whole heat transfer process temperature difference is comparatively even, and without the heat transfer bottleneck, exergy loss is little, and is energy-conservation obvious.
2, the liquefaction process heat exchanger adopts plate-fin heat exchanger:
Both at home and abroad the main heat exchanger equipment of LNG factory is mainly around heat exchange of heat pipe and plate-fin heat exchanger, only has two of APCI and LINDE around heat exchange of heat pipe manufacturer's this life circle, and price is higher, and plate-fin heat exchanger manufacturer at home is more.Main heat exchanger in external Large LNG factory all adopt around pipe.
Adopt natural gas liquefaction system of the present utility model, main heat exchanger adopts plate-fin heat exchanger, and large-scale liquefaction plant production domesticization is limited by the form of main heat exchanger no longer.
3, the maximization of refrigerant compression:
The main restriction of acc power by compression of the bottleneck that the LNG scale maximizes adopts the power of the utility model scheme azeotrope compression MR1 and azeotrope compressor MR2 to accomplish same large, adopts the utility model can maximum accomplish the LNG device of ten million ton.
Description of drawings
The utility model will illustrate by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is structural representation of the present utility model.
The specific embodiment
The utility model adopts multi-stage precooling agent evaporimeter to carry out precooling, and the more many more energy efficient of progression (being the number of precooling agent evaporimeter) of precooling employing.But be the most rational from operation and economic investment level Four.Adopt the level Four precooling can save 10% than the power that adopts three grades of pre-cold compressor of precooling.Therefore, the utility model will be elaborated as an example of level Four precooling agent evaporimeter example:
a kind of two compound cryogen refrigeration system with precooling, as shown in Figure 1, comprise: precooling agent compressor 1, precooling agent cooler 2, precooling agent separator 3, high pressure precooling agent evaporimeter 4, middle pressure precooling agent evaporimeter 5, low pressure precooling agent evaporimeter 6, low low pressure precooling agent evaporimeter 7, MR1 compressor 8, MR1 cooler 9, main cryogenic heat exchanger 10 liquefies, MR2 compressor 11, MR2 cooler 12, MR2 separator 13, cross cold main cryogenic heat exchanger 14, one-level J-T valve 15, secondary J-T valve 16, three grades of J-T valves 17, level Four J-T valve 18, Pyatyi J-T valve 19, six grades of J-T valves 20, seven grades of J-T valves 21 etc., wherein:
1) level Four precooling agent evaporimeter (comprising the high pressure precooling agent evaporimeter 4, middle pressure precooling agent evaporimeter 5, low pressure precooling agent evaporimeter 6 and the low pressure precooling agent evaporimeter 7 that connect successively), precooling agent compressor 1, precooling agent cooler 2, precooling agent separator 3 connect and compose the precooling agent chilldown system successively, wherein:
The vapor outlet port of level Four precooling agent evaporimeter all accesses precooling agent compressor 1, and the outlet of precooling agent compressor 1 is connected with precooling agent cooler 2, precooling agent separator 3, one-level J-T valve 15, high pressure precooling agent evaporimeter 4, secondary J-T valve 16, middle pressure precooling agent evaporimeter 5, three grades of J-T valves 17, low pressure precooling agent evaporimeter 6, level Four J-T valve 18 and low pressure precooling agent evaporimeters 7 successively;
2) MR1 compressor 8, MR1 cooler 9, level Four precooling agent evaporimeter and the main cryogenic heat exchanger 10 that is connected connect successively, consist of mix refrigerant MR1 refrigeration system;
3) MR2 compressor 11, MR2 cooler 12, level Four precooling agent evaporimeter, the main cryogenic heat exchanger 10 of liquefaction, cross cold main cryogenic heat exchanger 14 and be connected with the MR2 separator and connect successively, consist of mix refrigerant MR2 refrigeration system.
The main cryogenic heat exchanger 10 of described liquefaction is plate-fin heat exchanger with crossing cold main cryogenic heat exchanger 14.
Operation principle of the present utility model is: the circulation of adjacent higher temperature level is given to heat in the circulation of lower temperature level.First order precooling agent kind of refrigeration cycle provides cold for natural gas, mix refrigerant MR1 and mix refrigerant MR2; Mix refrigerant MR1 circulation in the second level provides cold for natural gas, mix refrigerant MR1 and mix refrigerant MR2; Third level mix refrigerant MR2 circulation self provides cold for natural gas and mix refrigerant MR2.Cooling by four evaporimeters and two plate-fin heat exchangers, the temperature of natural gas reduces gradually, until liquefaction.
Claims (3)
1. the two compound cryogen refrigeration system with precooling, is characterized in that: comprise the precooling agent chilldown system that is connected and composed successively by multi-stage precooling agent evaporimeter, precooling agent compressor, precooling agent cooler and precooling agent separator; The mix refrigerant MR1 refrigeration system that is connected and composed successively by MR1 compressor, MR1 cooler, multi-stage precooling agent evaporimeter and the main cryogenic heat exchanger that liquefies; By MR2 compressor, MR2 cooler, multi-stage precooling agent evaporimeter, the main cryogenic heat exchanger that liquefies, cross the mix refrigerant MR2 refrigeration system that cold main cryogenic heat exchanger and MR2 separator connect and compose successively.
2. the two compound cryogen refrigeration system with precooling according to claim 1, it is characterized in that: described multi-stage precooling agent evaporimeter is level Four precooling agent evaporimeter, comprises the high pressure precooling agent evaporimeter, middle pressure precooling agent evaporimeter, low pressure precooling agent evaporimeter and the low pressure precooling agent evaporimeter that connect successively.
3. the two compound cryogen refrigeration system with precooling according to claim 1 is characterized in that: the main cryogenic heat exchanger of described liquefaction and to cross cold main cryogenic heat exchanger be plate-fin heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220647616 CN202973761U (en) | 2012-11-30 | 2012-11-30 | Double composite cryogen refrigerating system with pre-cooling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220647616 CN202973761U (en) | 2012-11-30 | 2012-11-30 | Double composite cryogen refrigerating system with pre-cooling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202973761U true CN202973761U (en) | 2013-06-05 |
Family
ID=48514826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220647616 Expired - Lifetime CN202973761U (en) | 2012-11-30 | 2012-11-30 | Double composite cryogen refrigerating system with pre-cooling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202973761U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102927791A (en) * | 2012-11-30 | 2013-02-13 | 中国石油集团工程设计有限责任公司 | Dual compounding cryogen refrigeration system with a precooling function and method |
| CN115406130A (en) * | 2021-05-26 | 2022-11-29 | 中国科学院理化技术研究所 | Turbine expansion low-temperature system capable of quickly cooling and quickly rewarming |
| CN116538761A (en) * | 2023-07-03 | 2023-08-04 | 东营市赫邦化工有限公司 | Chlorine liquefying device |
-
2012
- 2012-11-30 CN CN 201220647616 patent/CN202973761U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102927791A (en) * | 2012-11-30 | 2013-02-13 | 中国石油集团工程设计有限责任公司 | Dual compounding cryogen refrigeration system with a precooling function and method |
| CN115406130A (en) * | 2021-05-26 | 2022-11-29 | 中国科学院理化技术研究所 | Turbine expansion low-temperature system capable of quickly cooling and quickly rewarming |
| CN116538761A (en) * | 2023-07-03 | 2023-08-04 | 东营市赫邦化工有限公司 | Chlorine liquefying device |
| CN116538761B (en) * | 2023-07-03 | 2023-09-22 | 东营市赫邦化工有限公司 | Chlorine liquefying device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102927791A (en) | Dual compounding cryogen refrigeration system with a precooling function and method | |
| CN102538391B (en) | Multi-level single-component refrigeration natural gas liquefaction system and multi-level single-component refrigeration natural gas liquefaction method | |
| WO2013135037A1 (en) | Apparatus and method for liquefying natural gas by refrigerating single mixed working medium | |
| CN101625190A (en) | Mixed refrigerant re-circulated liquefaction process for precooling coalbed methane (CBM) by residual pressure of pressure swing adsorption (PSA) | |
| WO2013071789A1 (en) | Device and method for liquefying natural gas using single mixed working medium as refrigeration medium | |
| CN102564059A (en) | Twin-stage multi-component mixed refrigerant refrigeration natural gas liquefaction system and method | |
| CN113503692A (en) | Hydrogen liquefaction system | |
| CN102628634B (en) | Ternary-cycle cascade refrigeration natural gas liquefaction system and method thereof | |
| CN202973761U (en) | Double composite cryogen refrigerating system with pre-cooling | |
| CN202813975U (en) | Unconventional natural gas liquefaction system based on winding tubular heat exchanger | |
| CN104807287A (en) | Small natural gas liquefaction and refrigeration system and small natural gas liquefaction and refrigeration method | |
| CN102564057A (en) | Propane pre-cooling mixed refrigerant liquefaction system applied to base-load type natural gas liquefaction factory | |
| CN102620460B (en) | Hybrid refrigeration cycle system and method with propylene pre-cooling | |
| CN103398545B (en) | System for producing liquefied natural gas by multistage compression and throttling of feed gas | |
| CN203310202U (en) | Dual-mixed-refrigerant liquefying system applied to base load type natural gas liquefaction factory | |
| CN204630250U (en) | A kind of mini gas liquefying refrigerating system | |
| CN202630581U (en) | Ternary-cycle cascaded refrigeration natural gas liquefaction system | |
| CN209279430U (en) | A kind of refrigeration equipment producing liquefied natural gas | |
| CN102645084B (en) | Method and device for preparing liquefied natural gas by using mixed refrigerant three-level refrigeration | |
| CN108007068B (en) | Heat integration rectification air separation system for LNG cold energy utilization | |
| CN202547274U (en) | Multi-stage single-component refrigerated natural gas liquefaction system | |
| CN104880024B (en) | Natural gas liquefying system for double-expansion cooling process | |
| CN202547273U (en) | Two-stage multi-component mixed refrigerant refrigeration natural gas liquefaction system | |
| CN202692600U (en) | Two-stage mixing refrigerant cycle gas liquification system | |
| CN117168087A (en) | Modular hydrogen liquefaction system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180115 Address after: 610041 Chengdu high tech Zone, Sichuan province sublimation Road No. 6 Patentee after: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. Address before: 610041 Chengdu high tech Zone, Sichuan province sublimation Road No. 6 Patentee before: CNPC ENGINEERING DESIGN Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130605 |