CN111409809A - Comprehensive system and method for keeping freshness of ships using L NG power and cold energy - Google Patents
Comprehensive system and method for keeping freshness of ships using L NG power and cold energy Download PDFInfo
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- CN111409809A CN111409809A CN202010299278.9A CN202010299278A CN111409809A CN 111409809 A CN111409809 A CN 111409809A CN 202010299278 A CN202010299278 A CN 202010299278A CN 111409809 A CN111409809 A CN 111409809A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000011084 recovery Methods 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 239000003345 natural gas Substances 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 18
- 239000003507 refrigerant Substances 0.000 claims description 93
- 238000005057 refrigeration Methods 0.000 claims description 34
- 238000004378 air conditioning Methods 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 11
- 238000004064 recycling Methods 0.000 claims description 9
- 238000007710 freezing Methods 0.000 claims description 4
- 230000008014 freezing Effects 0.000 claims description 4
- 239000002918 waste heat Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000004146 energy storage Methods 0.000 claims 1
- 230000004044 response Effects 0.000 abstract description 2
- 238000005338 heat storage Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000011232 storage material Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
- B63J2/12—Heating; Cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
- F17C1/002—Storage in barges or on ships
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention relates to a comprehensive system and a method for keeping ships L NG power and cold energy fresh, which comprises a L NG storage tank, a cold energy recovery heat exchanger, a natural gas heating heat exchanger and a buffer tank, wherein the buffer tank is connected with an engine through a pipeline, the cold energy recovery heat exchanger is respectively connected with a cold storage tank and a cold medium heat exchanger through a three-way regulating valve, and then returns to the cold energy recovery heat exchanger after being connected with a circulating pump to form a cold energy recovery circulating system, the cold storage tank, a driving pump, the cold medium heat exchanger and a plurality of cold energy utilization pipelines which are connected in parallel are sequentially connected, and finally returns to the cold storage tank to form the cold energy utilization circulating system, and the cold energy utilization circulating system can ensure the response speed of cold supply of the system and store redundant cold energy into the cold storage tank by utilizing the adjustment of a three-way regulating valve, so that the stability of cold supply is effectively kept.
Description
Technical Field
The invention relates to the technical field of utilization of cold energy of L NG of refrigerated ships, in particular to a comprehensive system and a method for keeping freshness of L NG power and cold energy of ships.
Background
Currently, with the stricter global and domestic control on the harmful gas emission of ships, the ships tend to use pure L NG power or L NG/fuel oil dual-fuel power, but when L NG is converted into normal-temperature natural gas which can be normally combusted by ship engines, the released cold energy is wasted and not fully utilized, some methods for utilizing L NG cold energy are proposed, but the methods have the following problems:
1. more is theoretical analysis, and the practical application is not considered, and the practical application possibility on the ship is not high due to the lack of consideration under the limit of practical equipment boundary conditions.
2. Although the modes are more, the effect and the degree of each target are limited, and the modes are not deeply designed for a special purpose, so that a certain special requirement of ship application is well met.
3. Although the existing mode can meet the requirement of realizing in principle, due to lack of consideration of practical application, even if the existing mode can be really applied to a practical ship, the existing mode also has the defects of high realization cost, complex structure, low efficiency, heavy burden on space and weight of the ship and the like.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a comprehensive system and a method for keeping the power and cold energy of L NG of a ship fresh, wherein a cold energy recovery circulating system is formed by continuous circulating flow of a first refrigerant among a cold energy recovery heat exchanger, a cold storage tank and a cold medium heat exchanger, a cold energy utilization circulating system is formed by continuous circulating flow of a second refrigerant among the cold storage tank, the cold medium heat exchanger and a plurality of parallel air-conditioning heat exchangers, cold energy released in the gasification process of L NG for combustion is effectively used for refrigerating and keeping the cold of a refrigeration house fresh, and the system has the advantages of quick response time, good adaptability, small occupied space and low maintenance and implementation cost.
The technical scheme for realizing the purpose is as follows:
the invention provides a comprehensive system for keeping ships L NG power and cold energy fresh, which comprises a L NG storage tank, a cold energy recovery heat exchanger and a buffer tank which are sequentially connected, wherein the buffer tank is connected with an engine through a pipeline, the cold energy recovery heat exchanger is provided with a first cold end inlet, a first cold end outlet, a first hot end inlet and a first hot end outlet, a natural gas heating heat exchanger is also connected between the first cold end outlet and the buffer tank, and the natural gas heating heat exchanger is connected with an external heating medium;
the heat exchanger also comprises a heat storage tank, wherein the heat storage tank is filled with a first refrigerant, a second refrigerant and a cold storage substance which are separated from each other, the heat storage tank is provided with a first refrigerant inlet and a first refrigerant outlet for the first refrigerant to enter and exit, and a second refrigerant inlet and a second refrigerant outlet for the second refrigerant to enter and exit, and the first refrigerant runs in a heat exchange pipeline of the heat storage tank and fully exchanges heat with the second refrigerant and the cold storage substance;
the cold energy recycling system comprises a cold energy recycling circulating system, and is characterized by further comprising a cold medium heat exchanger, wherein the cold medium heat exchanger is provided with a second cold end inlet, a second cold end outlet, a second hot end inlet and a second hot end outlet, the first hot end outlet is connected with a three-way regulating valve, the three-way regulating valve is further provided with a first outlet and a second outlet, the first outlet is connected with the first refrigerant inlet, the first refrigerant outlet is connected with the first hot end inlet through a circulating pump, the second outlet is connected with the second cold end inlet, the second cold end outlet is connected with the first hot end inlet through the circulating pump, so that a cold energy recycling circulating system is formed, and a first refrigerant runs inside the cold energy recycling circulating;
the second refrigerant outlet is connected with the second hot end inlet through a driving pump, the second hot end outlet is connected with the second refrigerant inlet through a plurality of cold energy utilization pipelines connected in parallel to form a cold energy utilization circulating system, and the second refrigerant runs inside the second refrigerant, wherein each cold energy utilization pipeline is respectively provided with a control valve and an air-conditioning heat exchanger.
Further, the first cold end outlet is also connected with the gas phase space of the L NG storage tank through a second valve, so that a part of gas can be supplemented into the L NG storage tank as required, and the pressure of the L NG storage tank is ensured to be stable.
Furthermore, the working temperature range of the first refrigerant is-45 ℃ to 0 ℃, and the working temperature range of the second refrigerant is-25 ℃ to 0 ℃.
Furthermore, a refrigeration heat exchanger is arranged on at least one cold energy utilization pipeline in the plurality of cold energy utilization pipelines connected in parallel, the refrigeration heat exchanger is provided with a third cold end outlet and a third cold end inlet, the third cold end outlet is connected with the third cold end inlet through a compressor, a radiator and a throttle valve in sequence, an additional refrigeration cycle is formed, cold energy for freezing under higher requirements is provided, and an emergency standby cold source of the cold energy utilization circulation system can be provided.
Further, the radiator is a water-cooling radiator or an air-cooling radiator.
Furthermore, the working temperature range of the external heating medium is 20-100 ℃, and waste heat of engine cylinder sleeve water is preferably selected, so that the energy utilization efficiency can be improved, and the comprehensive use cost can be reduced.
The application also provides a method for keeping the freshness of the ships L NG by using the system and cold energy, which comprises the following steps:
s1, heating and gasifying L NG in a L NG storage tank through a cold energy recovery heat exchanger and a natural gas heating heat exchanger under the action of the pressure in the storage tank, and then feeding the gasified cold energy into a buffer tank for an engine to use;
s2, under the action of a circulating pump, a first refrigerant fully exchanges heat with L NG in a cold energy recovery heat exchanger at a certain flow rate, passes through a three-way regulating valve, or enters a cold storage tank, exchanges heat with a second refrigerant and cold storage substances in the cold storage tank, or directly enters a cold medium heat exchanger to exchange heat with the second refrigerant, and then flows back to the cold energy recovery heat exchanger to form a cold energy recovery circulation system;
and S3, under the action of the driving pump, after flowing out of the cold storage tank at a required flow rate, the second refrigerant enters a plurality of cold energy utilization pipelines connected in parallel through the cold medium heat exchanger, cold energy is provided for a plurality of spaces in the air-conditioning heat exchanger, and the second refrigerant after heat exchange returns to the cold storage tank to form a cold energy utilization circulation system for cold storage and fresh keeping.
Further, in step S2, according to the actual requirement of the working condition and the cold energy utilization, the temperature of the first refrigerant that completes heat exchange in the cold medium heat exchanger controls the three-way regulating valve to distribute the flow ratio to the cold storage tank and the cold medium heat exchanger, thereby reasonably controlling whether the cold energy is directly used or stored.
Further, in step S2, the freezing temperature of the cold storage material is-20 ℃, and the cold storage function is performed by using a large amount of cold energy absorbed in the phase change process.
Further, in step S3, a refrigeration heat exchanger is disposed on at least one of the multiple parallel cold energy utilization pipelines, a refrigerant in the refrigeration heat exchanger is pressurized to 3-5Mpa by a compressor after heat exchange and temperature rise, and then sequentially flows back to the refrigeration heat exchanger under the action of a radiator and a throttle valve, so as to form an additional refrigeration cycle, provide cold energy for refrigeration, and provide an emergency standby cold source of the cold energy utilization system.
The comprehensive system and the method have the advantages that compared with the prior art, the comprehensive system and the method for preserving the power and the cold energy of the ship L NG are different in that the comprehensive system and the method comprise a L NG storage tank, a cold energy recovery heat exchanger, a natural gas heating heat exchanger and a buffer tank, the buffer tank is connected with an engine through a pipeline, the cold energy recovery heat exchanger is respectively connected with a cold storage tank and a cold medium heat exchanger through a three-way regulating valve, and then the cold energy recovery heat exchanger is connected with a circulating pump and then returns to the cold energy recovery heat exchanger to form a cold energy recovery circulating system, in addition, the cold storage tank, a driving pump, the cold medium heat exchanger and a plurality of cold energy utilization pipelines which are connected in parallel are sequentially connected, and finally the cold storage tank returns to the cold storage tank to form a cold energy utilization circulating system, through the arrangement of the cold storage tank, the fluctuation of the load of the engine is effectively balanced, the stability of cold supply is kept, the cold supply can be continuously carried out when the engine stops running and the cold quantity is insufficient, the power requirement of the engine is met, the utilization rate of the gasification of the cold energy release is effectively improved L, the cold energy utilization rate of the cold storage is effectively improved, the first and the cold storage tank and the cold storage system can be used for directly exchanging heat in the cold medium storage system according to the cold storage system, the cold storage system can be used for the cold storage system, the cold storage system can be adjusted, the cold storage system.
Drawings
Fig. 1 is a schematic diagram of an integrated system for keeping a ship L NG powered by cold energy fresh according to a preferred embodiment of the present invention.
The system comprises a 100-L NG storage tank, a 200-cold storage tank, a 31-cold energy recovery heat exchanger, a 32-heating heat exchanger, a 33-cold medium heat exchanger, a 34-refrigeration heat exchanger, a 45-radiator, a 51-circulating pump, a 52-driving pump, a 61-compressor, a 62-throttling valve and a 700-buffer tank.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, the invention provides a comprehensive system for keeping freshness of power and cold energy of L NG of a ship, which comprises a L NG storage tank 100, a cold energy recovery heat exchanger 31 and a buffer tank 700, wherein the L NG storage tank 100 is connected with a first cold end inlet 311 of the cold energy recovery heat exchanger 31 through a first pipeline L1 and a first valve V1, a first cold end outlet 312 of the cold energy recovery heat exchanger 31 is connected with a natural gas heating heat exchanger 32 through a third pipeline L3, and then is connected with the buffer tank 700 through a fourth pipeline L4, the buffer tank 700 is connected with an engine through a pipeline to provide natural gas for combustion, wherein the natural gas heating heat exchanger 32 supplies heat through an external heating medium, the working temperature range of the external heating medium is 20-100 ℃, and waste heat of cylinder liner water of the engine is preferably used to improve energy utilization efficiency and reduce comprehensive use cost;
l NG tank 100, under the effect of the tank internal pressure, L NG enters cold energy recovery heat exchanger 31 to perform sufficient heat exchange, and after heat exchange, the natural gas becomes gas with relatively high temperature (below 0 ℃), but the temperature required by normal combustion of the engine still cannot be met, and the flow of the natural gas has large change according to the change of the engine power, and the natural gas is heated by natural gas heating heat exchanger 32, so that the temperature of the natural gas meets the temperature range required by normal operation of the engine, and the natural gas enters buffer tank 700 after being heated, and the pressure and the temperature of the natural gas supplied to the engine can be further stabilized.
Meanwhile, according to the pressure change condition in the L NG storage tank 100, the first cold end outlet 312 of the cold energy recovery heat exchanger 31 can supplement gas into the L NG storage tank 100 through the second pipeline L2 and the second valve V2 so as to maintain the pressure in the L NG storage tank 100 stable.
The comprehensive utilization system also comprises a cold storage tank 200, wherein the cold storage tank 200 is filled with a first refrigerant, a second refrigerant and cold storage substances which are separated from each other, the cold storage tank 200 is provided with a first refrigerant inlet 201 and a first refrigerant outlet 202 for the first refrigerant to enter and exit, and a second refrigerant inlet 203 and a second refrigerant outlet 204 for the second refrigerant to enter and exit, and the first refrigerant runs in a heat exchange pipeline of the cold storage tank 200 and fully exchanges heat with the second refrigerant and the cold storage substances;
the comprehensive utilization system further comprises a cold medium heat exchanger 33, wherein the cold medium heat exchanger 33 is provided with a second cold end inlet 331, a second cold end outlet 332, a second hot end inlet 333 and a second hot end outlet 334, the first hot end outlet 314 of the cold energy recovery heat exchanger 31 is connected with a three-way regulating valve V3 through a fifth pipeline L5, the three-way regulating valve V3 is further provided with a first outlet and a second outlet, the first outlet is connected with the first refrigerant inlet 201, the first refrigerant outlet 202 is connected with the first hot end inlet 313 of the cold energy recovery heat exchanger 31 through a circulating pump 51, the second outlet is connected with the second cold end inlet 331 of the cold medium heat exchanger 33, and the second cold end outlet 332 is connected with the first hot end inlet 313 through the circulating pump 51 to form a cold energy recovery circulation system;
the first refrigerant in the cold energy recovery circulation system enters the cold energy recovery heat exchanger 31 through the first hot end inlet 313 through the eighth pipeline L8 under the action of the circulating pump 51 and fully exchanges heat with L NG, the first refrigerant enters the three-way regulating valve V3 through the fifth pipeline L5 from the first hot end outlet 314 of the cold energy recovery heat exchanger 31 after heat exchange is finished, one path of the first refrigerant can pass through the first outlet of the three-way regulating valve V3 and enters the cold storage tank 200 through the first cold end inlet 201 to exchange heat with the second refrigerant and cold storage substances through the sixth pipeline L6, the other path of the first refrigerant can pass through the second outlet of the three-way regulating valve V3 and enters the cold medium heat exchanger 33 through the seventh pipeline L7 and exchanges heat with the second refrigerant through the second cold end inlet 331, and the first refrigerant returns to the circulating pump 51 again under the driving action of the circulating pump 51 after heat exchange of the cold storage tank 200 and/or the cold medium heat exchanger 33, and complete circulation is finished;
when the cold quantity required by the cold storage and fresh-keeping warehouse is large, or the cold storage and fresh-keeping warehouse starts refrigerating, according to the temperature of the first refrigerant which completes heat exchange in the cold medium heat exchanger 33, the three-way regulating valve V3 is controlled to distribute the flow ratio flowing to the cold storage tank 200 and the cold medium heat exchanger 33, the first refrigerant is controlled to directly flow into the cold medium heat exchanger 33 through the second outlet as much as possible, and direct cold supply is performed on the cold storage and fresh-keeping warehouse, and when the cold quantity has surplus part or does not need to be supplied to the cold storage and fresh-keeping warehouse, the first refrigerant is controlled to flow into the heat exchange pipeline in the cold storage tank 200 through the first outlet as much as possible through the three-way regulating valve V3.
The second refrigerant flows into the cooling medium heat exchanger 33 from the second refrigerant outlet 204 of the heat storage tank 200 through the ninth pipeline L9 and the second hot end inlet 333 to exchange heat with the first refrigerant under the driving action of the driving pump 52, after the heat exchange is completed, the second refrigerant flows into the air-conditioning heat exchanger 41 from the second hot end outlet 334 of the cooling medium heat exchanger 33 through the tenth pipeline L10 and the control valve V4, flows into the air-conditioning heat exchanger 42 through the eleventh pipeline L11 and the control valve V5, flows into the air-conditioning heat exchanger 43 through the twelfth pipeline L12 and the control valve V6, and flows into the air-conditioning heat exchanger 44 through the thirteenth pipeline L13 and the control valve V7, the four air-conditioning heat exchangers (41, 42, 43 and 44) are collected in parallel, then return to the heat storage tank 200 through the fourteenth pipeline L14 and exchange heat with the first refrigerant and the heat storage substance fully in the heat storage tank 200, and a cold energy utilization circulation system is formed.
Therefore, the cold energy recycling circulation system and the cold energy utilization circulation system respectively and independently operate, the first refrigerant and the second refrigerant continuously exchange heat in the cold medium heat exchanger 33 and the cold storage tank 200, and redundant cold energy is stored in cold storage materials. The comprehensive utilization system can simultaneously provide cooling capacity for the space where the four air-conditioning heat exchangers (41, 42, 43 and 44) are located, the number and the specification of the heat exchangers can be correspondingly adjusted by the control valve and the air-conditioning heat exchangers according to the number of refrigerators in the ship and the size of the space volume, and the specific number and the specification are not limited and are all within the protection range of the application.
The second refrigerant in the cold storage tank 200 is used as a secondary refrigerant for supplying cold to the cold storage and fresh keeping warehouse, so that cold can be obtained by directly exchanging heat in the refrigerant medium heat exchanger 33, and cold can also be obtained by exchanging heat in the cold storage tank 200, and after cold storage is completed, cold storage substances in the cold storage tank 200 can independently supply cold to the cold storage and fresh keeping warehouse continuously through the second refrigerant when an engine stops running or the cold is insufficient.
Specifically, the working temperature range of the first refrigerant is-45 ℃ to 0 ℃, wherein the temperature range of the first refrigerant before heat exchange of the cold energy recovery heat exchanger 31 is-20 ℃ to 0 ℃, and the temperature range after heat exchange is-45 ℃ to-20 ℃; the working temperature range of the second refrigerant is-25 ℃ to 0 ℃.
The system is additionally provided with an additional refrigeration cycle to ensure the emergency situation in practical application and the requirement of a large amount of refrigeration required by refrigeration, a pipeline where a thirteenth pipeline L13 is located is a cold energy utilization pipeline required for refrigeration, a second driving pump 52 is connected with a third hot end inlet 343 of a refrigeration heat exchanger 34 through a thirteenth pipeline L13 and a seventh valve V7, then a third hot end outlet 344 of the refrigeration heat exchanger 34 is connected with an air-conditioning heat exchanger 44, the additional refrigeration cycle can provide refrigeration energy for refrigeration in a cold energy utilization cycle, the refrigeration energy for refrigeration can also adjust the temperature in the whole cold energy utilization system as a second refrigerant for refrigeration by the additional refrigeration cycle returns to a cold storage tank 200, a common refrigerant for a refrigeration house is used in the additional refrigeration cycle, the refrigerant is heated to be gaseous after being subjected to heat exchange through the refrigeration heat exchanger 34, enters a compressor 61 from a third cold end outlet 342, is pressurized to 3-5MPa through the compressor 61, enters a radiator 45 for heat radiation, is cooled through a throttle valve 62 and is reduced in the expansion process, and finally returns to the third cold end inlet 331 to form a complete refrigeration cycle radiator 45 which can adopt an air-cooled radiator or an air-cooled radiator.
Preferably, the freezing temperature of the cold storage material in the cold storage tank 200 is-20 ℃ for absorbing cold energy and achieving the purpose of storing cold energy, and the second refrigerant flowing out of the cold storage tank 200 can be basically stabilized at-20 ℃ due to the effect of the cold storage material, and the lowest temperature cannot exceed-25 ℃.
The above embodiments are merely preferred embodiments of the present disclosure, which are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present disclosure, should be included in the scope of the present disclosure.
Claims (10)
1. A comprehensive system for keeping freshness of L NG power and cold energy of a ship comprises a L NG storage tank, a cold energy recovery heat exchanger and a buffer tank which are sequentially connected, wherein the buffer tank is connected with an engine through a pipeline, the cold energy recovery heat exchanger is provided with a first cold end inlet, a first cold end outlet, a first hot end inlet and a first hot end outlet, and the comprehensive system is characterized in that a natural gas heating heat exchanger is further connected between the first cold end outlet and the buffer tank and is connected with an external heating medium;
the refrigerator is characterized by further comprising a cold storage tank, wherein the cold storage tank is filled with a first refrigerant, a second refrigerant and cold storage substances which are separated from each other, and is provided with a first refrigerant inlet and a first refrigerant outlet for the first refrigerant to enter and exit, and a second refrigerant inlet and a second refrigerant outlet for the second refrigerant to enter and exit;
the cold energy recycling system comprises a cold energy recycling circulating system, and is characterized by further comprising a cold medium heat exchanger, wherein the cold medium heat exchanger is provided with a second cold end inlet, a second cold end outlet, a second hot end inlet and a second hot end outlet, the first hot end outlet is connected with a three-way regulating valve, the three-way regulating valve is further provided with a first outlet and a second outlet, the first outlet is connected with the first refrigerant inlet, the first refrigerant outlet is connected with the first hot end inlet through a circulating pump, the second outlet is connected with the second cold end inlet, the second cold end outlet is connected with the first hot end inlet through the circulating pump, so that a cold energy recycling circulating system is formed, and a first refrigerant runs inside the cold energy recycling circulating;
the second refrigerant outlet is connected with the second hot end inlet through a driving pump, the second hot end outlet is connected with the second refrigerant inlet through a plurality of cold energy utilization pipelines connected in parallel to form a cold energy utilization circulating system, and the second refrigerant runs inside the second refrigerant, wherein each cold energy utilization pipeline is respectively provided with a control valve and an air-conditioning heat exchanger.
2. The integrated marine L NG power and cold energy refreshment system of claim 1, wherein the first cold outlet is further connected to the vapor space of the L NG storage tank through a second valve.
3. The integrated system for keeping ships L NG powered and cold-energy fresh as claimed in claim 1, wherein the first refrigerant has a working temperature range of-45 ℃ to 0 ℃ and the second refrigerant has a working temperature range of-25 ℃ to 0 ℃.
4. The integrated system for power and cold energy storage in L of claim 1, wherein a refrigeration heat exchanger is disposed on at least one of the plurality of parallel cold energy utilization pipelines, the refrigeration heat exchanger having a third cold end outlet and a third cold end inlet, the third cold end outlet being connected to the third cold end inlet sequentially through a compressor, a radiator and a throttle valve to form an additional refrigeration cycle.
5. The integrated system for keeping ships L NG powered and cold-powered as claimed in claim 4, wherein the heat sink is a water-cooled heat sink or an air-cooled heat sink.
6. The comprehensive system for keeping ships L NG powered and cold-energy fresh as claimed in claim 1, wherein the working temperature of the external heating medium is 20-100 ℃, and the external heating medium is preferably waste heat of engine cylinder water.
7. A method for keeping a ship L NG fresh by using power and cold energy of the system of claim 1, comprising the steps of:
s1, heating and gasifying L NG in a L NG storage tank through a cold energy recovery heat exchanger and a natural gas heating heat exchanger under the action of the pressure in the storage tank, and then feeding the gasified cold energy into a buffer tank for an engine to use;
s2, under the action of a circulating pump, a first refrigerant fully exchanges heat with L NG in a cold energy recovery heat exchanger at a certain flow rate, passes through a three-way regulating valve, or enters a cold storage tank, exchanges heat with a second refrigerant and cold storage substances in the cold storage tank, or directly enters a cold medium heat exchanger to exchange heat with the second refrigerant, and then flows back to the cold energy recovery heat exchanger to form a cold energy recovery circulation system;
and S3, under the action of the driving pump, after the second refrigerant flows out of the cold storage tank at a required flow rate, the second refrigerant enters a plurality of cold energy utilization pipelines connected in parallel through the cold medium heat exchanger, cold energy is provided for a plurality of spaces in the air-conditioning heat exchanger, and the second refrigerant after heat exchange returns to the cold storage tank to form a cold energy utilization circulating system.
8. The method for keeping ships L NG fresh using power and cold energy as claimed in claim 7, wherein in step S2, the three-way regulating valve is controlled to distribute the flow ratio to the cold storage tank and the cold medium heat exchanger according to the actual requirement of working condition and cold energy utilization by the temperature of the first refrigerant that completes heat exchange in the cold medium heat exchanger.
9. The method for keeping a ship L NG powered and cold-powered by claim 7, wherein the freezing temperature of the cold-storage substance is-20 ℃ in step S2.
10. The method for keeping the marine vessel L NG powered and cold energy fresh as claimed in claim 7, wherein in step S3, a refrigeration heat exchanger is disposed on at least one cold energy utilization pipeline of the plurality of cold energy utilization pipelines connected in parallel, and a refrigerant in the refrigeration heat exchanger is heated after heat exchange and is pressurized to 3-5Mpa by a compressor, and then flows back to the refrigeration heat exchanger under the action of a radiator and a throttle valve in sequence to form an additional refrigeration cycle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010299278.9A CN111409809A (en) | 2020-04-16 | 2020-04-16 | Comprehensive system and method for keeping freshness of ships using L NG power and cold energy |
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| CN202010299278.9A CN111409809A (en) | 2020-04-16 | 2020-04-16 | Comprehensive system and method for keeping freshness of ships using L NG power and cold energy |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113148097A (en) * | 2021-04-20 | 2021-07-23 | 浙江大学常州工业技术研究院 | LNG (liquefied Natural gas) vehicle and ship refrigeration micro-power air conditioning system |
| CN114750925A (en) * | 2021-01-08 | 2022-07-15 | 三菱重工业株式会社 | Cold heat recovery system and ship or floating body with same |
Citations (10)
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| WO2022222758A1 (en) * | 2021-04-20 | 2022-10-27 | 浙江大学常州工业技术研究院 | Lng carrier refrigeration micro-power air conditioning system |
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