WO2021115137A1 - Système de réfrigération à gnl pour conditionnement d'air - Google Patents

Système de réfrigération à gnl pour conditionnement d'air Download PDF

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Publication number
WO2021115137A1
WO2021115137A1 PCT/CN2020/132218 CN2020132218W WO2021115137A1 WO 2021115137 A1 WO2021115137 A1 WO 2021115137A1 CN 2020132218 W CN2020132218 W CN 2020132218W WO 2021115137 A1 WO2021115137 A1 WO 2021115137A1
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WO
WIPO (PCT)
Prior art keywords
heat exchanger
cold storage
pipeline
lng
valve
Prior art date
Application number
PCT/CN2020/132218
Other languages
English (en)
Chinese (zh)
Inventor
蒋春辉
蒋宁婧
Original Assignee
蒋春辉
蒋宁婧
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 蒋春辉, 蒋宁婧 filed Critical 蒋春辉
Priority to KR1020227012620A priority Critical patent/KR102612611B1/ko
Publication of WO2021115137A1 publication Critical patent/WO2021115137A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H1/3202—Cooling devices using evaporation, i.e. not including a compressor, e.g. involving fuel or water evaporation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • 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
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F17C9/04—Recovery of thermal energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

Definitions

  • the invention relates to the field of LNG air-conditioning and refrigeration, in particular to an LNG air-conditioning refrigeration system.
  • LNG as a clean energy source
  • LNG As a fuel, LNG is safe, efficient, clean and pollution-free, which not only promotes the transformation of my country's energy structure, but also effectively reduces environmental pollution caused by combustion exhaust emissions.
  • LNG will release a large amount of cold energy during the vaporization process before combustion, and usually this part of the cold energy will be directly discharged into the atmosphere, resulting in a waste of cold energy.
  • Traditional air-conditioning and refrigeration systems generally use compressors as the core equipment of the refrigeration system, but the compressors require a certain economic cost and make noise during operation.
  • Some LNG-based air conditioning and refrigeration systems have also been proposed in the prior art. These refrigeration systems generally adopt a dual-medium heat exchange scheme in which the refrigerant and LNG are directly exchanged. Due to the excessive exchange between LNG and refrigerant The thermal temperature difference causes the refrigeration system to be prone to freezing of the refrigerant and poor heat exchange, which cannot guarantee the safe and stable operation of the refrigeration system.
  • the technical problem to be solved by the present invention is: in order to solve the problems of freezing of the carrier refrigerant and poor heat exchange in the LNG air-conditioning refrigeration system in the prior art, the present invention provides an LNG air-conditioning refrigeration system to solve the above-mentioned problems.
  • an LNG air-conditioning refrigeration system including an LNG storage tank, a three-medium high-temperature difference heat exchanger, an air-conditioning refrigeration unit and a control unit;
  • the LNG storage tank is used to store LNG
  • the three-medium high temperature difference heat exchanger includes a shell, an upper heat exchanger and a lower heat exchanger.
  • the shell is provided with a cavity, and the cavity is provided with a gas-liquid conversion characteristic cold storage agent, the cold storage agent.
  • the upper heat exchanger is in communication with the LNG storage tank, and the upper heat exchanger is located in the cavity and is fully connected to the gas-phase cold storage agent. Contact; the lower heat exchanger is located in the cavity and is in full contact with the liquid phase cold storage agent;
  • the air-conditioning refrigeration unit includes a fan-coil heat exchange unit and a circulating pump, the fan-coil heat exchange unit includes a fan and a coil heat exchanger; the inlet end of the coil heat exchanger is exchanged with the bottom through a pipe The outlet end of the heat exchanger is in communication, the outlet end of the coil heat exchanger is in communication with the inlet end of the circulating pump, the outlet end of the circulating pump is connected to the inlet end of the lower heat exchanger, and the lower heat exchanger
  • the loop formed by the heat exchanger, the coil heat exchanger and the circulating pump has a refrigerant carrier;
  • the fan is located on one side of the coil heat exchanger, the other side of the coil heat exchanger is provided with an air outlet, and the blowing direction of the fan faces the coil heat exchanger; the control unit Control connection with the circulating pump and fan.
  • the power unit is a thermal energy application equipment fueled by natural gas
  • the power unit is connected to the LNG storage tank through a main medium pipeline, and the main medium pipeline is close to the LNG storage tank.
  • One end of the tank is provided with a first manual shut-off valve;
  • the inlet end of the upper heat exchanger is communicated with the main medium pipeline through the cold storage pipeline inlet pipe, and the connection between the cold storage pipeline inlet pipe and the main medium pipeline is located at the first manual stop valve and the power unit In between, a second manual shut-off valve is provided on the inlet pipe of the cold storage pipeline;
  • the outlet end of the upper heat exchanger is in communication with the main medium pipeline through the outlet pipe of the cold storage pipeline, and the connection between the outlet pipe of the cold storage pipeline and the main medium pipeline is located between the inlet pipe of the cold storage pipeline and the main medium. Between the connection of the pipeline and the connection of the main medium pipeline and the power unit.
  • the three-medium high temperature difference heat exchanger is provided with a first temperature sensor, a pressure sensor, a liquid level sensor and a safety valve, and the first temperature sensor is used to monitor the temperature of the liquid phase cold storage agent.
  • the pressure sensor is used to monitor the pressure of the gas-phase refrigerant
  • the liquid level sensor is used to measure the liquid level of the liquid-phase refrigerant
  • the safety valve is used to automatically take off when the pressure of the gas-phase refrigerant exceeds the standard.
  • a second temperature sensor is arranged at the inlet end of the coil heat exchanger, a third temperature sensor is arranged at the outlet end of the coil heat exchanger, and a fourth temperature sensor is arranged near the air outlet;
  • the control unit communicates with the first temperature sensor, the pressure sensor, the liquid level sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor.
  • a first electromagnetic regulating valve is provided on the inlet pipe of the cold storage pipeline, and the first electromagnetic regulating valve is located between the second manual stop valve and the inlet end of the upper heat exchanger;
  • a second electromagnetic regulating valve is provided on the main medium pipeline, and the second electromagnetic regulating valve is located at the junction of the outlet pipe of the cold storage pipeline and the main medium pipeline and the inlet pipe of the cold storage pipeline and the main medium pipeline Between the connections;
  • the control unit is in control connection with the first solenoid regulating valve and the second solenoid regulating valve;
  • the pipeline connected to the inlet end of the circulating pump is provided with a third manual shut-off valve, and the pipeline connected to the outlet end of the circulating pump is provided with a fourth manual shut-off valve.
  • it further includes a refrigerant buffer tank, which is located between the third manual shut-off valve and the outlet end of the coil heat exchanger.
  • Fig. 1 is a schematic structural diagram of an optimal embodiment of an LNG air-conditioning refrigeration system of the present invention.
  • Fig. 2 is a process in which LNG of an LNG air-conditioning refrigeration system of the present invention enters a power unit.
  • Fig. 3 is a cold storage process of an LNG air-conditioning refrigeration system of the present invention.
  • Fig. 4 is a refrigeration process of an LNG air-conditioning refrigeration system of the present invention.
  • the present invention provides an LNG air-conditioning refrigeration system, including a three-medium two-stage heat exchange system, an LNG pipeline system, an air-conditioning refrigeration unit, a monitoring system, an LNG storage tank 101, a power unit 105, and a control unit 501 .
  • the LNG pipeline system includes a main medium pipeline 103, a cold storage pipeline inlet pipe 401, and a cold storage pipeline outlet pipe 405.
  • the main medium pipeline 103 is used to connect the LNG storage tank 101 and the power unit 105.
  • One end of the main medium pipeline 103 is connected to the LNG storage tank 101, and the other end is connected to the power unit 105.
  • the main medium pipeline 103 is close to the LNG storage tank 101.
  • a first manual shut-off valve 102 is provided at one end.
  • the LNG storage tank 101 is a container for storing LNG
  • the power unit 105 is a thermal energy application device using natural gas as fuel.
  • the LNG can enter the power unit 105 from the main medium pipeline 103 only after the first manual shut-off valve 102 is opened.
  • the first manual shut-off valve 102 When the LNG enters the power unit 105, as shown in FIG. 2, the first manual shut-off valve 102 is first opened, and the LNG flows out of the LNG storage tank 101 into the main medium pipeline 103, and then enters the power unit 105 for combustion to perform work.
  • the operator When the LNG storage tank 101 needs to be replaced or repaired, the operator must first close the first manual shut-off valve 102, and then perform the replacement and repair operations on the LNG storage tank 101.
  • the three-medium two-stage heat exchange system includes a three-medium high temperature difference heat exchanger 201 and a cold storage agent.
  • the three-medium high temperature difference heat exchanger 201 includes a shell 204, an upper heat exchanger 404, and a lower heat exchanger 302.
  • the upper heat exchanger 404 is connected in parallel to the main medium pipeline 103 through the cold storage pipeline inlet pipe 401 and the cold storage pipeline outlet pipe 405.
  • the inlet end of the upper heat exchanger 404 communicates with the main medium pipeline 103 through the cold storage pipeline inlet pipe 401, and the outlet end of the upper heat exchanger 404 communicates with the main medium pipeline 103 through the cold storage pipeline outlet pipe 405.
  • the junction between the cold storage pipeline inlet pipe 401 and the main medium pipeline 103 is located between the first manual shut-off valve 102 and the power unit 105, and the junction between the cold storage pipeline outlet pipe 405 and the main medium pipeline 103 is located at the cold storage pipeline inlet pipe Between the connection point between 401 and the main medium pipeline 103 and the power unit 105.
  • LNG enters the main medium pipeline 103 from the LNG storage tank 101, and enters the upper heat exchanger 404 from the cold storage pipeline inlet pipe 401.
  • a second manual shut-off valve 402 is provided on the inlet pipe 401 of the cold storage pipeline.
  • LNG air conditioning and refrigeration systems generally only work when the weather is hot.
  • the second manual shut-off valve 402 can be manually closed, the LNG stops entering the cold storage pipeline inlet pipe 401, and only enters the power unit 105 through the main medium pipeline 103 for combustion and energy supply.
  • the housing 204 is provided with a cavity, and the cold storage agent is located inside the cavity.
  • the cold storage agent has gas-liquid conversion characteristics, and includes a gas-phase cold storage agent 203 that is in a gaseous state and a liquid-phase cold storage agent 202 that is in a liquid state.
  • the gas-phase cold storage agent 203 and the liquid-phase cold storage agent 202 are two existing forms of the cold storage agent, and their freezing temperature is lower than the temperature of the LNG in the LNG storage tank 101, that is, under any circumstances will not freeze due to the absorption of the LNG cold energy; It has a higher liquefaction temperature and a lower liquefaction pressure, that is, when it is kept in a liquid state at a high temperature (such as 50°C), the pressure in the cavity is not too high (such as 1MPa); it has a higher temperature in both gaseous and liquid state. Thermal conductivity, and has a large latent heat of vaporization. In the cavity, the gas-phase cold storage agent 203 is located above the liquid-phase cold storage agent 202.
  • the upper heat exchanger 404 and the lower heat exchanger 302 are both located in the cavity inside the shell 204, and the upper heat exchanger 404 is located above the lower heat exchanger 302.
  • the upper heat exchanger 404 is in full contact with the gas-phase cold storage agent 203, and LNG is present in the upper heat exchanger 404.
  • the lower heat exchanger 302 is in full contact with the liquid-phase cold storage agent 202, and there is a refrigerant 317 in the lower heat exchanger 302.
  • the temperature of the gas-phase refrigerant 203 is higher than the temperature of the liquid-phase refrigerant 202.
  • the gas-phase refrigerant 203 can be liquefied into the liquid-phase refrigerant 202 by absorbing the cold energy of LNG, and the liquid-phase refrigerant 202 can absorb heat by The way is vaporized into the gas-phase cold storage agent 203.
  • the LNG-based refrigeration systems used in the prior art adopt a two-medium single-stage heat exchange scheme in which LNG and refrigerant 317 directly exchange heat. Since the temperature of LNG is relatively low (for example, -150°C, or even lower), the heat exchange temperature difference between LNG and refrigerant 317 is large (100 ⁇ 120°C), the heat exchange between the two will inevitably cause the factor of refrigerant 317. Condensation occurs when the temperature is too low, causing the pipe of the heat exchanger to be blocked.
  • the gas-phase cold storage agent 203 absorbs the LNG cold capacity and is continuously liquefied, and the pressure in the chamber gradually decreases.
  • the pressure is lower than the evaporation pressure of the liquid phase cold storage agent 202 ,
  • the liquid-phase cold storage agent 202 evaporates faster, so reciprocating, indirect transfer and storage of cold energy are realized.
  • the control system 501 adjusts the first electromagnetic regulating valve 403 on the cold storage pipeline inlet pipe 401, The flow rate of LNG entering the upper heat exchanger 404 is controlled to realize the control of the cold input of the three-medium high temperature difference heat exchanger 201.
  • the low LNG flow control accuracy and the first electromagnetic regulating valve 403 closed after the upper heat exchanger 404 and cold storage pipeline outlet are effectively avoided
  • the temperature of the liquid phase cold storage agent 202 is too low due to the continuous cooling of the LNG retained in the tube 405, thereby eliminating the freezing problem of the refrigerant 317, and overcoming the high temperature difference heat exchange barrier that cannot be broken through the dual-medium heat exchange between the LNG and the refrigerant 317 .
  • the air conditioning and refrigeration unit includes a refrigerant pipeline 307, a circulating pump 309, a fan coil heat exchange unit 304, and a refrigerant buffer tank 306.
  • the refrigerant pipeline 307, the circulating pump 309, the lower heat exchanger 302, the fan coil heat exchange unit 304, and the refrigerant buffer tank 306 are communicated with each other through pipelines, and the refrigerant 317 is provided in the pipeline of the air conditioning refrigeration unit.
  • the fan-coil heat exchange unit 304 includes a fan 314, a coil heat exchanger 315, and heat exchange fins 306.
  • the inlet end of the coil heat exchanger 315 is communicated with the outlet end of the lower heat exchanger 302 through the coil inlet pipe 303, and the outlet end of the coil heat exchanger 315 is connected to the inlet of the refrigerant buffer tank 306 through the coil outlet pipe 305
  • the outlet end of the refrigerant buffer tank 306 communicates with the inlet end of the circulation pump 309 through the refrigerant pipeline 307, and the outlet end of the circulation pump 309 communicates with the inlet end of the lower heat exchanger 302 through the pipeline.
  • the fan 314 is arranged on one side of the coil heat exchanger 315, and the other side of the coil heat exchanger 315 is provided with an air outlet, and the blowing direction of the fan 314 faces the coil heat exchanger 315.
  • the refrigerant carrier buffer tank 306 is used to temporarily store the refrigerant carrier 317 in the air-conditioning refrigeration unit, to compensate for the volume fluctuation of the refrigerant carrier 317 due to its own temperature change, and to ensure the stable operation of the air-conditioning refrigeration unit.
  • the control unit 501 controls to turn on the fan 314 and the circulating pump 309.
  • the refrigerant 317 circulates in the air conditioning refrigeration unit under the action of the circulating pump 309, and the refrigerant 317 absorbs the liquid phase in the lower heat exchanger 302.
  • the cooling capacity of the cold storage agent 202 and the temperature of the refrigerant 317 decrease, and then flow into the coil heat exchanger 315.
  • the fan 314 forces the air in the cooling space 301 to flow through the coil heat exchanger 315 and the heat exchange fins 316 for exchange. As it heats, the air absorbs the cooling capacity of the refrigerant 317 and lowers the temperature, and blows it out from the air outlet to lower the temperature of the cooling space 301.
  • the control unit 501 is in control connection with the fan 314 and the circulating pump 309, and can control the opening, closing and speed adjustment of the fan 314 and the circulating pump 309.
  • the circulating pump 309 is a frequency conversion circulating pump 309
  • the fan 314 is a frequency conversion fan.
  • the coil heat exchanger 315 adopts a finned tube heat exchanger, and the coil heat exchanger 315 is provided with heat exchange fins 316.
  • the LNG air-conditioning refrigeration system uses the three-medium high-temperature difference heat exchanger 201 to recover the cold energy of LNG as the cold source of the air-conditioning refrigeration system, eliminating the high power consumption component-the compressor, which is necessary for the conventional vapor compression refrigeration cycle.
  • the three-medium high temperature difference heat exchanger 201 does not consume any electric energy and does not require maintenance, and has a high economic effect and environmental protection effect compared with a traditional refrigeration system.
  • the monitoring system includes a first temperature sensor 206, a pressure sensor 205, a liquid level sensor 208, a second temperature sensor 312, a third temperature sensor 311, a fourth temperature sensor 313, a first solenoid regulating valve 403, a second solenoid regulating valve 104, Fan 314 and circulating pump 309.
  • the control unit 501 is a device with data receiving and processing capabilities.
  • the control unit 501 interacts with the first temperature sensor 206, the pressure sensor 205, the liquid level sensor 208, the safety valve 207, the second temperature sensor 312, the third temperature sensor 311, and the fourth temperature sensor.
  • the temperature sensor 313 is communicatively connected, and the control unit 501 is controlly connected to the first solenoid regulating valve 403 and the second solenoid regulating valve 104.
  • the monitoring system includes a temperature control system, a pressure system, a safety system and a liquid level system.
  • the temperature control system includes a first temperature sensor 206, a second temperature sensor 312, a third temperature sensor 311, a fourth temperature sensor 313, a first electromagnetic regulating valve 403, a fan 314, and a circulating pump 309.
  • the first temperature sensor 206 is located on the three-medium high temperature difference heat exchanger 201, and the first temperature sensor 206 is used to measure the temperature of the liquid phase cold storage agent 202.
  • the second temperature sensor 312 and the third temperature sensor 311 are both located in the air conditioning refrigeration unit, the second temperature sensor 312 is located between the outlet end of the lower heat exchanger 302 and the inlet end of the coil heat exchanger 315, and the third temperature sensor 311 Located between the outlet end of the coil heat exchanger 315 and the refrigerant buffer tank 306, the second temperature sensor 312 is used to measure the temperature of the refrigerant 317 entering the coil heat exchanger 315, and the third temperature sensor 311 is used The temperature of the refrigerant 317 flowing out of the coil heat exchanger 315 is measured.
  • the fourth temperature sensor 313 is located in the cooling space 301 and is used to measure the temperature of the cooling space 301.
  • the first solenoid regulating valve 403 is arranged on the inlet pipe 401 of the cold storage pipeline, the first solenoid regulating valve 403 is located between the second manual shut-off valve 402 and the inlet end of the upper heat exchanger 404, and the control unit 501 is regulated by the first solenoid
  • the valve 403 controls the flow of LNG into the inlet pipe 401 of the cold storage pipeline.
  • the pressure system includes a pressure sensor 205, which is located on the three-medium high temperature difference heat exchanger 201, and is mainly used to monitor the pressure of the gas phase cold storage agent 203.
  • the liquid level system includes a liquid level sensor 208, which is located on the three-medium high temperature difference heat exchanger 201, and is mainly used to detect the liquid level height of the liquid phase cold storage agent 202.
  • the safety system includes a safety valve 207, which is arranged at the upper end of the three-medium high temperature difference heat exchanger 201.
  • the safety valve 207 is preset with a take-off threshold. When the pressure of the gas-phase refrigerant 203 exceeds the take-off threshold, the safety valve 207 automatically takes off and releases the pressure to ensure the safe operation of the three-medium high temperature difference heat exchanger 201.
  • the liquid phase cold storage agent 202 absorbs the heat of the refrigerant 317 and the temperature rises and is continuously vaporized, while the gas phase cold storage agent 203 absorbs the cold energy of the LNG continuously. It is liquefied into a liquid phase cold storage agent 202.
  • the control unit 501 controls to reduce the first electromagnetic regulation.
  • the opening degree of the valve 403 reduces the flow of LNG entering the upper heat exchanger 404.
  • the control unit 501 controls to increase the opening of the first electromagnetic regulating valve 403 to increase the inlet
  • the LNG flow rate of the upper heat exchanger 404 increases the cold input.
  • the control unit 501 controls the first electromagnetic regulating valve 403 on the cold storage pipeline inlet pipe 401 to open, and another part of the LNG flowing out of the LNG storage tank 101 passes through the cold storage pipeline
  • the inlet pipe 401 flows into the upper heat exchanger 404 and exchanges heat with the gas-phase refrigerant 203 in the upper heat exchanger 404.
  • the gas-phase refrigerant 203 absorbs the cold energy of the LNG in the upper heat exchanger 404 and is liquefied.
  • the gas-phase cold storage agent 203 reflows into the liquid-phase cold storage agent 202 by gravity to achieve cold storage.
  • the control unit 501 closes the first electromagnetic regulating valve 403, stops the supply of LNG, and the cold storage process stops .
  • the LNG absorbs heat in the upper heat exchanger 404 and then vaporizes.
  • the vaporized LNG enters the main medium pipeline 103 again through the cold storage pipeline outlet pipe 405, and then enters the power unit 105 for combustion.
  • the LNG air-conditioning refrigeration system also has a delayed refrigeration function.
  • the control unit 501 closes the first solenoid regulating valve 403 and the second solenoid regulating valve 104, and the LNG stops entering the upper heat exchanger 404. Since the low-temperature liquid phase cold storage agent 202 in the three-medium high temperature difference heat exchanger 201 stores a large amount of cold energy, the refrigerant carrier 317 can obtain cold energy from the liquid phase cold storage agent 202 through the lower heat exchanger 302, and the air conditioning refrigeration unit is still It can perform refrigeration operation, realize the effect of delayed refrigeration, and has the function of cold storage air conditioning.
  • the temperature of the liquid phase cold storage agent 202 gradually rises and is continuously vaporized into the gas phase cold storage agent 203.
  • the control unit 501 turns off the circulating pump 309, and the cold storage air conditioner The cooling process is over.
  • the control unit 501 acquires the temperature of the cooling space 301 according to the fourth temperature sensor 313, and acquires the temperature of the refrigerant 317 before and after cooling through the second temperature sensor 312 and the third temperature sensor 311.
  • the control unit 501 detects that the air temperature in the cooling space 301 reaches the set temperature
  • the control unit 501 finely controls the flow of the refrigerant 317 by adjusting the rotation speed of the circulating pump 309, and analyzes the third temperature sensor 311 and the fourth temperature sensor 312
  • the monitored refrigerant 317 flows through the temperature data of the fan coil heat exchange unit 304 before and after cooling, and the temperature in the cooling space 301 is accurately controlled.
  • the user can adjust the rotation speed of the fan 314 through the control unit 501, and adjust the temperature drop rate of the cooling space 301.
  • the present invention further includes a third manual shut-off valve 308, a fourth manual shut-off valve 310, and a refrigerant buffer tank 306.
  • the third manual shut-off valve 308 is arranged on the pipeline communicating with the inlet end of the circulating pump 309
  • the fourth manual shut-off valve 310 is arranged on the pipeline communicating with the outlet end of the circulating pump 309.
  • the operator can first manually close the third manual shut-off valve 308 and the fourth manual shut-off valve 310, and then take out the circulating pump 309 to avoid the leakage of the refrigerant 317 in the air conditioning refrigeration unit ;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

L'invention concerne un système de réfrigération à GNL pour conditionnement d'air, comprenant un réservoir de stockage de GNL (101), un échangeur de chaleur à différence de température élevée à trois milieux (201), une unité de réfrigération pour conditionnement d'air et une unité de commande (501). Le réservoir de stockage de GNL (101) est utilisé pour stocker du GNL. L'échangeur de chaleur à différence de température élevée à trois milieux (201) comprend un boîtier (204), un échangeur de chaleur supérieur (404) et un échangeur de chaleur inférieur (302). Une cavité de réception est formée à l'intérieur du boîtier (204). Des réfrigérants présentant des caractéristiques de conversion gaz-liquide sont situés dans la cavité de réception. Les réfrigérants comprennent un réfrigérant en phase gazeuse (203) à l'état gazeux et un réfrigérant en phase liquide (202) à l'état liquide. L'unité de réfrigération pour conditionnement d'air comprend une unité d'échange de chaleur à serpentin à ventilateur (304) et une pompe de circulation (309). L'échangeur de chaleur inférieur (302), un échangeur de chaleur à serpentin (315) et la pompe de circulation (309) sont en communication au moyen d'un tuyau. Un milieu de réfrigération (317) est situé dans le tuyau de l'unité de réfrigération pour conditionnement d'air. L'unité d'échange de chaleur à serpentin à ventilateur (304) comprend un ventilateur (314) et l'échangeur de chaleur à serpentin (315). Le ventilateur (314) se trouve au niveau d'un côté de l'échangeur de chaleur à serpentin (315). L'unité de commande (501) est en liaison de commande avec la pompe de circulation (309) et le ventilateur (314). Dans le système de réfrigération, un système d'échange de chaleur à trois milieux est adopté, les problèmes de congélation de milieu de réfrigération et de faible échange de chaleur pendant l'échange de chaleur à double milieu sont résolus, et la fonction de conditionnement d'air d'entreposage frigorifique est également décrite.
PCT/CN2020/132218 2019-12-12 2020-11-27 Système de réfrigération à gnl pour conditionnement d'air WO2021115137A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020227012620A KR102612611B1 (ko) 2019-12-12 2020-11-27 Lng 공조 냉각 시스템

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201911270384.8 2019-12-12
CN201911270384.8A CN110802996A (zh) 2019-12-12 2019-12-12 一种lng空调制冷系统

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WO2021115137A1 true WO2021115137A1 (fr) 2021-06-17

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CN (1) CN110802996A (fr)
WO (1) WO2021115137A1 (fr)

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CN110802996A (zh) * 2019-12-12 2020-02-18 酷豹低碳新能源装备科技(常州)有限公司 一种lng空调制冷系统
CN111409809A (zh) * 2020-04-16 2020-07-14 武彦峰 一种船舶lng动力及冷能保鲜的综合系统及方法
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