CN206875819U - A kind of liquefied natural gas combined cycle refrigeration system - Google Patents
A kind of liquefied natural gas combined cycle refrigeration system Download PDFInfo
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- CN206875819U CN206875819U CN201720697165.8U CN201720697165U CN206875819U CN 206875819 U CN206875819 U CN 206875819U CN 201720697165 U CN201720697165 U CN 201720697165U CN 206875819 U CN206875819 U CN 206875819U
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- heat exchanger
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- refrigeration system
- cold
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
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- Sorption Type Refrigeration Machines (AREA)
Abstract
The utility model proposes a kind of liquefied natural gas combined cycle refrigeration system, refrigeration system includes mix refrigerant refrigeration and combined with absorption refrigeration mechanism cold, turn into liquefied natural gas after the pre-cooled heat exchanger of natural gas and main heat exchanger cooling, precool heat exchanger device or main heat exchanger are freezed using mix refrigerant, the cold of mix refrigerant is provided by multiple stage circulation cryogen compressibility, and cold circulation caused by Absorption Refrigerator sequentially enters precool heat exchanger device and main heat exchanger；High-grade heat-driven multiple stage circulation cryogen compressibility caused by fuel combustion in heat engine, low grade heat energy produces cold for Absorption Refrigerator caused by the fuel combustion in heat engine.The utility model compares existing direct refrigeration process, in the case where reducing same temperature, can substantially reduce energy consumption.
Description
Technical field
The utility model belongs to liquefied natural gas process technical field, is related to liquefied natural gas preparation technology, and in particular to
A kind of mix refrigerant and gas turbine exhaust-heat absorption formula combined cycle refrigeration process.
Background technology
The advantages of liquefied natural gas is easy to store and transported with it, have become domestic and international natural gas trade, the one of accumulating
Kind trend, natural gas is also just turning into the third-largest energy after coal, oil, and is just promptly improving it in world energy sources knot
Shared proportion in structure.Natural gas liquefaction can select to use different fluidized flows according to conditions such as bleed pressure, gas componants
Journey.
In natural gas liquefaction flow, typical external refrigeration cycle has following several：Using different refrigerants composition
Cascade refrigeration liquefaction cycle, the circulation of mix refrigerant refrigeration liquefying, expander refrigeration liquefying circulation.Wherein mix refrigerant system
Cold liquefaction cycle is relatively low, easy to operate due to investing, and is widely used in middle-size and small-size natural gas liquefaction flow.
The general flow of mix refrigerant refrigeration liquefying circulation is that mix refrigerant is mixed after compression by compressor compresses
Close refrigerant and use circulating cooling water cooling, being pressurized and cooling down makes a part of mix refrigerant be condensed into liquid, air-liquid two-phase
Mix refrigerant enters separator, and gaseous state and liquid mixed refrigerant respectively enter heat exchanger runner, and mixed refrigerant liquid changes
After being subcooled in hot device, reducing pressure by regulating flow enters the middle part of heat exchanger；Mix refrigerant gas cools down in liquefaction heat exchanger, liquefied simultaneously
After supercooling, reducing pressure by regulating flow enters the bottom of liquefaction heat exchanger, from bottom to top vaporizes, and with backflowing hybrid refrigeration in the middle part of heat exchanger
Agent liquid joint continues to absorb heat, until being gasified totally, and reaches predetermined temperature and goes out heat exchanger.The mixing gone out after heat exchanger
Refrigerant returns to the entrance of compressor, then second compression and circulate.
Mix refrigerant kind of refrigeration cycle is using nitrogen and C1~C5 hydrocarbon mixtures as circulating refrigerant, it is only necessary to one
Compressor, compared to cascade refrigeration liquefaction cycle, flow is simplified, reduces investment.The proportion of composing of azeotrope should be according to richness
The composition of methane gas raw material, pressure, technological process and it is different, making the liquefaction process of unstripped gas, (natural gas is that temperature drops from normal temperature
To -162 DEG C) cold needed for each additive process matches completely with the cold that cryogen is provided is relatively difficult, therefore mixes
The efficiency for closing refrigerant circulation flow is lower than the cascade refrigeration liquefaction cycle of nine thermogrades.
Thus, on the basis of mixed-refrigerant cycle, the mixed-refrigerant cycle technique of propane pre-cooling is developed into, letter
Title C3-MRC techniques, its efficiency circulate close to stepwise, but the device complexity of such a method and investment improve relatively again.
Utility model content
In view of the deficienciess of the prior art, the purpose of this utility model is, there is provided a kind of mix refrigerant and combustion gas
Turbine exhaust-heat absorption formula combined cycle refrigeration process, energy consumption is low, efficiency ratio is high.
In order to solve the above-mentioned technical problem, the utility model, which adopts the following technical scheme that, is achieved：
A kind of liquefied natural gas combined cycle refrigeration system, the refrigeration system include mix refrigerant freeze with it is absorption
Refrigeration machine cooling is combined, and turns into liquefied natural gas after the pre-cooled heat exchanger of natural gas and main heat exchanger cooling, precool heat exchanger device or
Main heat exchanger is freezed using mix refrigerant, and the cold of the mix refrigerant is provided by multiple stage circulation cryogen compressibility；
Cold caused by the Absorption Refrigerator supplies precool heat exchanger device；
High-grade heat-driven multiple stage circulation cryogen compressibility caused by fuel combustion in heat engine, the fuel in heat engine
Low grade heat energy caused by burning produces cold for Absorption Refrigerator.
The multiple stage circulation cryogen compressibility includes refrigerant compressor, intersegmental cooler and intersegmental separator, precooling and changed
Mix refrigerant that hot device returns is compressed, after cooling and separation, and liquid portion enters precool heat exchanger device and main heat exchanger, gas
Part enters precool heat exchanger device and main heat exchanger after continuing compressed, cooling and separation.
The Absorption Refrigerator uses lithium bromide-water absorption type refrigeration system or aqua-ammonia absorption-type refrigerating machine system.
The aqua-ammonia absorption-type refrigerating machine system includes ammonia absorber, concentrated ammonia liquor delivery pump, concentrated ammonia liquor heat exchanger, ammonia rectifying
Tower, ammonia rectifying tower bottom reboiler and ammonia rectifying tower top condenser, ammonia rectifying tower top condenser are located at the top of ammonia rectifying column, ammonia rectifying
The ammoniacal liquor of tower tower reactor enters ammonia rectifying tower bottom reboiler, and the ammoniacal liquor of ammonia absorber adds through concentrated ammonia liquor delivery pump to concentrated ammonia liquor heat exchanger
Rectifying, condensation are carried out to ammonia rectifying column after heat, cryogen ammoniacal liquor returns to precool heat exchanger device, and the low grade heat energy through heat engine provides ammonia essence
Evaporate the heat of tower bottom reboiler.
The Absorption Refrigerator uses multi-stage booster.
The heat engine includes steam turbine, gas turbine and gas internal-combustion engine.
The low grade heat energy is reclaimed by exhaust heat of heat engine reclaimer.
The exhaust heat of heat engine reclaimer includes waste heat boiler and heat-condutive oil heat exchanger.
The mode of movement of the low grade heat energy includes steam and conduction oil.
The utility model compared with prior art, has the following technical effect that：
The utility model adds precooling technique by precool heat exchanger device, compared to existing direct refrigeration process, is reducing
At same temperature, energy consumption can be substantially reduced；
The utility model uses multi-stage refrigerating technique, on the basis of existing mix refrigerant refrigeration, increases absorption system
Cold is freezed, and the cold for making to provide needed for mix refrigerant declines, and reduces device entirety energy consumption.
Heat engine of the present utility model, its high-grade heat-driven coolant compressor are compressed, and low grade heat energy is for inhaling
Receipts formula refrigeration machine produces cold, makes full use of heat engine flue gas waste heat, Absorption Refrigerator need not consume other extra energy, whole
The efficiency ratio of individual system is improved.
Explanation is further explained in detail to particular content of the present utility model with reference to embodiments.
Brief description of the drawings
Fig. 1 is the process flow diagram of the utility model embodiment 1, and the solid arrow in figure represents flow direction.
Label in figure represents respectively：1- precool heat exchangers device, 2- main heat exchangers, 3- heat engines, the compression of 4-multiple stage circulation cryogen
System, 5-aqua-ammonia absorption-type refrigerating machine system, 6-exhaust heat of heat engine reclaimer；
4-1-refrigerant compressor, 4-2-intersegmental cooler, 4-3-intersegmental separator；
5-1-ammonia absorber, 5-2-concentrated ammonia liquor delivery pump, 5-3-concentrated ammonia liquor heat exchanger, 5-4-ammonia rectifying column, 5-5-
Ammonia rectifying tower bottom reboiler, 5-6-ammonia rectifying tower top condenser.
Embodiment
Only provide specific embodiment of the utility model below, it is necessary to explanation to be that the utility model is not limited to following
Specific embodiment, and all equivalents done on the basis of technical scheme each fall within protection model of the present utility model
Enclose.
The utility model mix refrigerant is defined as providing the nitrogen of cold by kind of refrigeration cycle and C1~C5 hydro carbons mixes
Thing.
The utility model low grade heat energy is reclaimed by exhaust heat of heat engine reclaimer, refers to and heat is reclaimed from tail gas of heat engine
The equipment of amount.
Embodiment 1：
The present embodiment provides a kind of liquefied natural gas combined cycle refrigeration system, including mix refrigerant refrigeration with it is absorption
Refrigeration machine cooling is combined, and turns into liquefied natural gas, precool heat exchanger device after the pre-cooled heat exchanger 1 of natural gas and the cooling of main heat exchanger 2
Or main heat exchanger is freezed using mix refrigerant, the cold of mix refrigerant is provided by multiple stage circulation cryogen compressibility 4；
Cold caused by Absorption Refrigerator supplies precool heat exchanger device；
High-grade heat-driven multiple stage circulation cryogen compressibility 4 caused by fuel combustion in heat engine 3, in heat engine 3
Low grade heat energy caused by fuel combustion produces cold for Absorption Refrigerator.
Multiple stage circulation cryogen compressibility 4 includes refrigerant compressor 4-1, intersegmental cooler 4-2 and intersegmental separator 4-3,
Precool heat exchanger device 1 return mix refrigerant it is compressed, cooling and separation after, liquid portion enter precool heat exchanger device 1 and master change
Hot device 2, gas part enter precool heat exchanger device 1 and main heat exchanger 2 after continuing compressed, cooling and separation.
Absorption Refrigerator uses lithium bromide-water absorption type refrigeration system or aqua-ammonia absorption-type refrigerating machine system 5.
Aqua-ammonia absorption-type refrigerating machine system 5 include ammonia absorber 5-1, concentrated ammonia liquor delivery pump 5-2, concentrated ammonia liquor heat exchanger 5-3,
Ammonia rectifying column 5-4, ammonia rectifying tower bottom reboiler 5-5 and ammonia rectifying tower top condenser 5-6, ammonia rectifying tower top condenser 5-6 are located at
At the top of ammonia rectifying column 5-4, the ammoniacal liquor of ammonia rectifying column 5-4 tower reactors enters ammonia rectifying tower bottom reboiler 5-5, ammonia absorber 5-1 ammonia
Water carries out rectifying, condensation, cryogen ammoniacal liquor after concentrated ammonia liquor delivery pump 5-2 to concentrated ammonia liquor heat exchanger 5-3 heating to ammonia rectifying column 5-4
Precool heat exchanger device 1 is returned to, the low grade heat energy through heat engine 3 provides ammonia rectifying tower bottom reboiler 5-5 heat.
Absorption Refrigerator uses multi-stage booster.
Heat engine 3 includes steam turbine, gas turbine and gas internal-combustion engine.
Low grade heat energy is reclaimed by exhaust heat of heat engine reclaimer 6.
Exhaust heat of heat engine reclaimer 6 includes waste heat boiler and heat-condutive oil heat exchanger.
The mode of movement of low grade heat energy includes steam and conduction oil.
Specifically, as shown in Figure 1：Purified natural gas enters one by the precooling of precool heat exchanger device 1 subsequently into main heat exchanger 2
Step is cooled down and liquefied.Compressed from the mix refrigerant that precool heat exchanger device 1 returns by refrigerant compressor (MRC) 4-1, mono- section of MRC
The mix refrigerant of outlet separates out a part of liquid after MRC intersegmental coolers 4-2 is by circulating cooling water cooling, passes through MRC
Intersegmental separator 4-3 separates liquid, and liquid passes through the precooling of precool heat exchanger device 1, enters back into main heat exchanger 2 and further cools down, and leads to
Mixed after crossing the decompression of JT valves with the cryogen that backflows, there is provided cold；The gas that the intersegmental separator 4-3 of MRC are isolated enter bis- sections of MRC after
Continuous compression, the mix refrigerant of refrigerant compressor 4-1 second stage exits pass through MRC intersegmental coolers 4-2 by circulating cooling water cooling
After separate out a part of liquid, liquid is separated by MRC discharge knockout drums, liquid passes through the precooling of precool heat exchanger device 1, enters back into master
Heat exchanger 2 further cools down, and is mixed after being depressurized by JT valves with the cryogen that backflows, there is provided cold；MRC discharge knockout drums are isolated
Gas passes through the precooling of precool heat exchanger device 1, enters back into main heat exchanger 2 and is cooled further to liquefaction, after being depressurized by JT valves, as returning
Flow cryogen and cold is provided.
Refrigerant compressor (MRC) 4-1 is connected with heat engine 3 (using gas turbine) by shaft coupling.
Fuel natural gas enters the combustion chambers burn of gas turbine, and air enters after being compressed by the compressor of gas turbine
Combustion chamber carries out combustion-supporting, the high temperature and high pressure flue gas acting driving gas turbine for generation of burning.Flue gas after acting enters more than heat engine
The waste heat of flue gas is passed to conduction oil by heat recovery equipment 6 (using heat-condutive oil heat exchanger), and heat is delivered to ammonia by high temperature heat conductive oil
Rectifying tower bottom reboiler 5-5.
The ammonia returned from precool heat exchanger device 1 is absorbed into ammonia absorber 5-1 by weak aqua ammonia, forms concentrated ammonia liquor, concentrated ammonia liquor
Boost by concentrated ammonia liquor delivery pump 5-2, then heated through overrich weak aqua ammonia heat exchanger 5-3, into ammonia rectifying column 5-4, in concentrated ammonia liquor
Ammonia be separated, tower top formed high pressure ammonia, high pressure ammoniacal liquor, a part of ammonia are condensed into by E rectifying tower top condensers 5-6
Liquid is sent to precool heat exchanger device 1 as ammonia rectifying column 5-4, a part of ammoniacal liquor as cryogen ammoniacal liquor；The ammoniacal liquor of ammonia rectifying column 5-4 tower reactors
Into ammonia rectifying tower bottom reboiler 5-5, the rising gas of ammonia rectifying tower bottom reboiler 5-5 gaseous phase materials as ammonia rectifying column 5-4,
Its liquid phase material is sent to ammonia absorber 5-1 as absorbent, ammonia essence after overrich weak aqua ammonia heat exchanger 5-3 reclaims heat and depressurizes
The heat for evaporating tower bottom reboiler 5-5 is provided by high temperature heat conductive oil.Precool heat exchanger device 1 is sent to from ammonia rectifying tower top condenser 5-6
Cryogen ammoniacal liquor provides cold after decompression for precool heat exchanger device 1, ammonia absorber 5-1 is returned to after gasification, because precool heat exchanger device 1 makes
The cold caused by cryogen ammoniacal liquor, the cold for making to provide needed for azeotrope decline, and reduce the overall energy consumption of device.Simultaneously
Because ammonia rectifying tower bottom reboiler 5-6 has used the waste heat of gas turbine flue gas, without consuming other extra energy, whole system
The efficiency ratio of system is improved.
The present embodiment operation principle is：
Prime mover of refrigeration compressor uses heat engine (such as steam turbine, gas turbine, gas internal-combustion engine), and fuel combustion produces
High-grade heat energy (steam turbine is heat energy higher than 200 DEG C or so, and gas turbine is the heat energy higher than 500 DEG C or so, in combustion gas
Combustion engine is the heat energy higher than 450 DEG C or so) it is changed into mechanical energy in heat engine, drive refrigeration compressor；It is low caused by fuel combustion
(steam turbine is heat energy less than 200 DEG C or so to grade heat energy, and gas turbine is the heat energy less than 500 DEG C or so, gas internal-combustion engine
For the heat energy less than 450 DEG C or so) deliver to cold is produced in Absorption Refrigerator, for precooling.Absorption Refrigerator uses
Material (including unstripped gas, mix refrigerant) is pre-chilled to -30 DEG C or so by aqua-ammonia absorption-type refrigerating machine, enters back into hybrid refrigeration
Agent heat exchanger, consumption of the low temperature process to cold is reduced, reduces the internal circulating load of refrigerant, reduce the power consumption of coolant compressor,
Reach the purpose for reducing investment and saving the energy and operating cost.
Economic comparison is carried out to above-mentioned technique, former technique is that natural gas turns into liquefaction naturally after main heat exchanger cools down
Gas：
Former technique shaft power：0.2892kWh/Nm3 unstripped gas
The present embodiment technique shaft power：0.2193kWh/Nm3 unstripped gas
Note 1：Data in table, it is the daily natural gas liquefaction device energy consumption data of 1,000,000 standard cubic meters based on treating capacity
Measuring and calculating, energy consumption of the conversion to 1 standard cubic meter natural gas of processing.
Note 2：Natural gas low heat valve is 28MJ/Nm3。
As can be seen that using precooling, the technique of mix refrigerant refrigeration and UTILIZATION OF VESIDUAL HEAT IN, energy consumption zero, only in combustion gas wheel
Machine combustion phases has a small amount of gas consumption.
Claims (9)
1. a kind of liquefied natural gas combined cycle refrigeration system, it is characterised in that the refrigeration system includes mix refrigerant system
It is cold to combine with absorption refrigeration mechanism cold, it is natural to turn into liquefaction after the pre-cooled heat exchanger of natural gas (1) and main heat exchanger (2) cooling
Gas, precool heat exchanger device or main heat exchanger are freezed using mix refrigerant, and the cold of the mix refrigerant is by multiple stage circulation cryogen
Compressibility (4) provides；
Cold caused by the Absorption Refrigerator supplies precool heat exchanger device；
High-grade heat-driven multiple stage circulation cryogen compressibility (4) caused by fuel combustion in heat engine (3), in heat engine (3)
Fuel combustion caused by low grade heat energy for Absorption Refrigerator produce cold.
2. refrigeration system as claimed in claim 1, it is characterised in that the multiple stage circulation cryogen compressibility (4) includes cryogen
Compressor (4-1), intersegmental cooler (4-2) and intersegmental separator (4-3), the mix refrigerant warp that precool heat exchanger device (1) returns
After compression, cooling and separation, liquid portion enters precool heat exchanger device (1) and main heat exchanger (2), the continuation of gas part is compressed,
Enter precool heat exchanger device (1) and main heat exchanger (2) after cooling and separation.
3. refrigeration system as claimed in claim 1, it is characterised in that the Absorption Refrigerator uses lithium bromide-water absorption type
Refrigeration system or aqua-ammonia absorption-type refrigerating machine system (5).
4. refrigeration system as claimed in claim 3, it is characterised in that the aqua-ammonia absorption-type refrigerating machine system (5) is inhaled including ammonia
Receive tower (5-1), concentrated ammonia liquor delivery pump (5-2), concentrated ammonia liquor heat exchanger (5-3), ammonia rectifying column (5-4), ammonia rectifying tower bottom reboiler
(5-5) and ammonia rectifying tower top condenser (5-6), ammonia rectifying tower top condenser (5-6) are located at the top of ammonia rectifying column (5-4), ammonia essence
The ammoniacal liquor for evaporating tower (5-4) tower reactor enters ammonia rectifying tower bottom reboiler (5-5), and the ammoniacal liquor of ammonia absorber (5-1) conveys through concentrated ammonia liquor
Rectifying, condensation are carried out to ammonia rectifying column (5-4) after pump (5-2) to concentrated ammonia liquor heat exchanger (5-3) heating, cryogen ammoniacal liquor returns to precooling
Heat exchanger (1), the low grade heat energy through heat engine (3) provide the heat of ammonia rectifying tower bottom reboiler (5-5).
5. refrigeration system as claimed in claim 1, it is characterised in that the Absorption Refrigerator uses multi-stage booster.
6. refrigeration system as claimed in claim 1, it is characterised in that the heat engine (3) includes steam turbine, gas turbine and combustion gas
Internal combustion engine.
7. refrigeration system as claimed in claim 1, it is characterised in that the low grade heat energy passes through exhaust heat of heat engine reclaimer
(6) reclaimed.
8. refrigeration system as claimed in claim 7, it is characterised in that the exhaust heat of heat engine reclaimer (6) includes waste heat boiler
And heat-condutive oil heat exchanger.
9. refrigeration system as claimed in claim 1, it is characterised in that the mode of movement of the low grade heat energy includes steam and led
Deep fat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201720697165.8U CN206875819U (en) | 2017-06-15 | 2017-06-15 | A kind of liquefied natural gas combined cycle refrigeration system |
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| CN201720697165.8U CN206875819U (en) | 2017-06-15 | 2017-06-15 | A kind of liquefied natural gas combined cycle refrigeration system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109210867A (en) * | 2018-08-28 | 2019-01-15 | 中国科学院理化技术研究所 | A kind of system recycling methane from coalbed methane containing oxygen |
| WO2022161114A1 (en) * | 2021-01-27 | 2022-08-04 | 李华玉 | Dual-fuel high-temperature heat source and dual-fuel power apparatus |
-
2017
- 2017-06-15 CN CN201720697165.8U patent/CN206875819U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109210867A (en) * | 2018-08-28 | 2019-01-15 | 中国科学院理化技术研究所 | A kind of system recycling methane from coalbed methane containing oxygen |
| CN109210867B (en) * | 2018-08-28 | 2021-03-19 | 中国科学院理化技术研究所 | System for retrieve methane in follow oxygen-bearing coal bed gas |
| WO2022161114A1 (en) * | 2021-01-27 | 2022-08-04 | 李华玉 | Dual-fuel high-temperature heat source and dual-fuel power apparatus |
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