CN211166331U - L NG air conditioner refrigerating system - Google Patents
L NG air conditioner refrigerating system Download PDFInfo
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- CN211166331U CN211166331U CN201922215397.7U CN201922215397U CN211166331U CN 211166331 U CN211166331 U CN 211166331U CN 201922215397 U CN201922215397 U CN 201922215397U CN 211166331 U CN211166331 U CN 211166331U
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Abstract
The utility model provides an L NG air conditioner refrigerating system, including L NG storage tank, three medium high temperature difference heat exchangers, air conditioner refrigeration unit and the control unit, the L NG storage tank is used for storing L NG, three medium high temperature difference heat exchangers include casing, upper heat exchanger and lower heat exchanger, the inside appearance chamber that is equipped with of casing, the appearance intracavity is equipped with the coolant that has the gas-liquid conversion characteristic, the coolant is including presenting gaseous phase coolant and presenting liquid phase coolant, air conditioner refrigeration unit includes fan coil heat transfer unit and circulating pump, heat exchanger, coil heat exchanger and circulating pump pass through the pipeline intercommunication down, air conditioner refrigeration unit's pipeline has the coolant, fan coil heat transfer unit includes fan and coil heat exchanger, the fan is located one side of coil heat exchanger, the control unit with circulating pump and fan control connection.
Description
Technical Field
The utility model relates to an L NG air conditioner refrigeration field, concretely relates to L NG air conditioner refrigerating system.
Background
With the deep transformation of energy consumption structures in China, L NG is used as a clean energy, and is greatly developed and widely applied to various fields by virtue of the advantages of high heat value, low price, small pollution after combustion, environmental friendliness and the like, L NG is safe, efficient, clean and pollution-free as a fuel, so that the transformation of the energy structures in China is promoted, and the environmental pollution caused by the emission of combustion waste gas is effectively reduced.
L NG releases a large amount of cold energy in the vaporization process before combustion, and usually the part of cold energy can be directly discharged to the atmospheric environment to cause waste of cold energy, the traditional air-conditioning refrigeration system generally adopts a compressor as the core equipment of the refrigeration system, but the compressor needs certain economic cost and generates noise when working, the prior art also provides some air-conditioning refrigeration systems based on L NG, the refrigeration systems generally adopt a double-medium heat exchange scheme of directly exchanging heat between secondary refrigerant and L NG, the problems of freezing and poor heat exchange of the secondary refrigerant easily occur in the refrigeration system due to the overlarge heat exchange temperature difference between L NG and the secondary refrigerant, and the safe and stable operation of the refrigeration system cannot be ensured.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that in order to solve the problems of poor heat exchange and freezing of secondary refrigerant of L NG air-conditioning refrigeration system in the prior art, the utility model provides a L NG air-conditioning refrigeration system to solve the problems.
The technical proposal adopted by the utility model for solving the technical problems is that an L NG air-conditioning refrigeration system comprises a L NG storage tank, a three-medium high temperature difference heat exchanger, an air-conditioning refrigeration unit and a control unit;
the L NG storage tank is used for storing L NG;
the three-medium high-temperature-difference heat exchanger comprises a shell, an upper heat exchanger and a lower heat exchanger, wherein a cavity is arranged in the shell, a cold storage agent with gas-liquid conversion characteristic is arranged in the cavity, the cold storage agent comprises a gaseous phase cold storage agent and a liquid phase cold storage agent, the upper heat exchanger is communicated with the L NG storage tank, the upper heat exchanger is positioned in the cavity and fully contacts with the gaseous phase cold storage agent, and the lower heat exchanger is positioned in the cavity and fully contacts with the liquid phase cold storage agent;
the air-conditioning refrigeration unit comprises a fan coil heat exchange unit and a circulating pump, and the fan coil heat exchange unit comprises a fan and a coil heat exchanger; the inlet end of the coil heat exchanger is communicated with the outlet end of the lower heat exchanger through a pipeline, the outlet end of the coil heat exchanger is communicated with the inlet end of the circulating pump, the outlet end of the circulating pump is connected with the inlet end of the lower heat exchanger, and secondary refrigerant is arranged in a loop formed by communicating the lower heat exchanger, the coil heat exchanger and the circulating pump;
the fan is positioned on one side of the coil heat exchanger, an air outlet is formed in the other side of the coil heat exchanger, and the blowing direction of the fan faces the coil heat exchanger; the control unit is in control connection with the circulating pump and the fan.
Preferably, the power unit is a thermal energy application device taking natural gas as fuel, the power unit is communicated with the L NG storage tank through a main medium pipeline, and one end, close to the L NG storage tank, of the main medium pipeline is provided with a first manual stop valve;
the inlet end of the upper heat exchanger is communicated with the main medium pipeline through a cold accumulation pipeline inlet pipe, the joint of the cold accumulation pipeline inlet pipe and the main medium pipeline is positioned between the first manual stop valve and the power unit, and a second manual stop valve is arranged on the cold accumulation pipeline inlet pipe;
the outlet end of the upper heat exchanger is communicated with the main medium pipeline through a cold accumulation pipeline outlet pipe, and the joint of the cold accumulation pipeline outlet pipe and the main medium pipeline is positioned between the joint of the cold accumulation pipeline inlet pipe and the main medium pipeline and the joint of the main medium pipeline and the power unit.
Preferably, 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, the first temperature sensor is used for monitoring the temperature of the liquid phase coolant, the pressure sensor is used for monitoring the pressure of the gas phase coolant, the liquid level sensor is used for measuring the liquid level height of the liquid phase coolant, and the safety valve is used for automatically tripping and releasing pressure when the pressure of the gas phase coolant 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 is communicated 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.
Preferably, a first electromagnetic regulating valve is arranged on the cold accumulation pipeline inlet pipe and is positioned between the second manual stop valve and the inlet end of the upper heat exchanger;
a second electromagnetic regulating valve is arranged on the main medium pipeline and is positioned between the joint of the cold accumulation pipeline outlet pipe and the main medium pipeline and the joint of the cold accumulation pipeline inlet pipe and the main medium pipeline;
the control unit is in control connection with the first electromagnetic regulating valve and the second electromagnetic regulating valve;
and a third manual stop valve is arranged on a pipeline connected with the inlet end of the circulating pump, and a fourth manual stop valve is arranged on a pipeline connected with the outlet end of the circulating pump.
Preferably, the system further comprises a secondary refrigerant buffer tank, wherein the secondary refrigerant buffer tank is positioned between the third manual stop valve and the outlet end of the coil heat exchanger.
The utility model has the advantages that:
(1) the cold energy recovered from L NG is used as a cold source of an air-conditioning refrigeration system, so that the waste of a large amount of cold energy caused by the vaporization of L NG is avoided, a compressor which is a high-power consumption component and is necessary in the conventional vapor compression refrigeration cycle is eliminated, the fuel consumption and the waste gas emission of a power unit are reduced, and the effects of energy conservation and emission reduction are remarkable.
(2) The utility model discloses and use the cold energy of three medium high temperature difference heat exchangers recovery L NG, overcome the high temperature difference heat transfer obstacle that L NG and two medium heat transfer of secondary refrigerant can't break through, the secondary refrigerant freezes with the bad problem of heat transfer when eliminating two medium heat transfers, guarantees L NG air conditioner refrigerating system steady, safe operation to through the cold-storage of liquid phase coolant, realized L NG cold-storage air conditioning function, system is efficient and the flow is simple.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of a preferred embodiment of an L NG air conditioning and refrigeration system according to the present invention.
Fig. 2 is a process of the present invention, wherein L NG of the L NG air conditioning and refrigeration system enters the power unit.
Fig. 3 is a cold accumulation process of L NG air-conditioning refrigeration system of the present invention.
Fig. 4 shows a refrigeration process of the L NG air conditioning refrigeration system of the present invention.
In the figure, 101, L NG storage tanks, 102, first manual stop valves, 103, main medium pipelines, 104, second electromagnetic regulating valves, 105, power units, 201, three-medium high-temperature-difference heat exchangers, 202, liquid-phase cold storage agents, 203, gas-phase cold storage agents, 204, shells, 205, pressure sensors, 206, first temperature sensors, 207, safety valves, 208, liquid level sensors, 301, cooling spaces, 302, lower heat exchangers, 303, coil inlet pipes, 304, fan coil heat exchange units, 305, coil outlet pipes, 306, coolant buffer tanks, 307, coolant pipelines, 308, third manual stop valves, 309, circulating pumps, 310, fourth manual stop valves, 311, third temperature sensors, 312, second temperature sensors, 313, fourth temperature sensors, 314, fans, 315, coil heat exchangers, 316, heat exchange fins, 317, coolant, cold storage pipes inlet pipes, 402, second manual stop valves, 403, first electromagnetic regulating valves, 404, upper heat exchangers, 405, cold storage pipelines, 501, and control units.
Detailed Description
As shown in fig. 1, the utility model provides an L NG air conditioner refrigerating system, including three medium doublestage heat transfer systems, L NG pipe-line system, air conditioner refrigerating unit, monitored control system, L NG storage tank 101, power unit 105 and the control unit 501.
The L NG line system includes the main medium line 103, the cold storage line inlet pipe 401, and the cold storage line outlet pipe 405.
The main medium pipeline 103 is used for communicating L NG storage tank 101 with the power unit 105, one end of the main medium pipeline 103 is connected with L NG storage tank 101, the other end is connected with the power unit 105, one end of the main medium pipeline 103 close to the L NG storage tank 101 is provided with a first manual stop valve 102, the L NG storage tank 101 is a container for storing L NG, the power unit 105 is a heat energy application device taking natural gas as fuel, and L NG can enter the power unit 105 from the main medium pipeline 103 after the first manual stop valve 102 is opened.
When L NG enters the power unit 105, as shown in FIG. 2, the first manual cut-off valve 102 is opened, the L NG storage tank 101 flows out L NG into the main medium pipeline 103, and then the power unit 105 is filled with combustion work, when the L NG storage tank 101 needs to be replaced or maintained, an operator needs to close the first manual cut-off valve 102, and then the L NG storage tank 101 needs to be replaced or maintained.
The three-medium two-stage heat exchange system comprises a three-medium high-temperature-difference heat exchanger 201 and a coolant, wherein the three-medium high-temperature-difference heat exchanger 201 comprises a shell 204, an upper heat exchanger 404 and a lower heat exchanger 302.
The upper heat exchanger 404 is connected in parallel on the main medium pipeline 103 through a cold accumulation pipeline inlet pipe 401 and a cold accumulation pipeline outlet pipe 405, the inlet end of the upper heat exchanger 404 is communicated with the main medium pipeline 103 through the cold accumulation pipeline inlet pipe 401, the outlet end of the upper heat exchanger 404 is communicated with the main medium pipeline 103 through the cold accumulation pipeline outlet pipe 405, the connection position of the cold accumulation pipeline inlet pipe 401 and the main medium pipeline 103 is positioned between the first manual stop valve 102 and the power unit 105, the connection position of the cold accumulation pipeline outlet pipe 405 and the main medium pipeline 103 is positioned between the connection position of the cold accumulation pipeline inlet pipe 401 and the main medium pipeline 103 and the power unit 105, after the first manual stop valve 102 is opened, L NG enters the main medium pipeline 103 from the L NG storage tank 101, and enters the upper heat exchanger 404 from the.
In the embodiment, the cold accumulation pipeline inlet pipe 401 is provided with the second manual stop valve 402, the L NG air-conditioning and refrigerating system generally works only when the weather is hot, when the cold accumulation pipeline inlet pipe is in winter or the air-conditioning operation is not needed for a long time, the second manual stop valve 402 can be manually closed, L NG stops entering the cold accumulation pipeline inlet pipe 401, and the cold accumulation pipeline inlet pipe enters the power unit 105 through the main medium pipeline 103 for combustion power supply.
The shell 204 is internally provided with a cavity, the cold storage agent is positioned in the cavity, the cold storage agent has gas-liquid conversion characteristics and comprises a gaseous phase cold storage agent 203 and a liquid phase cold storage agent 202, the gaseous phase cold storage agent 203 and the liquid phase cold storage agent 202 are two existing forms of the cold storage agent, the solidification temperature of the cold storage agent is lower than the temperature of L NG in the L NG storage tank 101, namely the cold storage agent cannot be frozen due to absorption of L NG cold in any case, the cold storage agent has higher liquefaction temperature and lower liquefaction pressure, namely the pressure in the cavity is not too high (such as 1 MPa) when the cold storage agent is kept in a liquid state at high temperature (such as 50 ℃), the gaseous phase cold storage agent 203 and the liquid phase cold storage agent have higher heat conductivity coefficients and larger latent heat of vaporization in the cavity, and the gaseous phase cold storage agent 203 is positioned above.
The upper heat exchanger 404 and the lower heat exchanger 302 are both located in a cavity inside the housing 204, the upper heat exchanger 404 is located above the lower heat exchanger 302, the upper heat exchanger 404 is in full contact with the gaseous phase coolant 203, L ng is present in the upper heat exchanger 404, the lower heat exchanger 302 is in full contact with the liquid phase coolant 202, and a coolant 317 is present in the lower heat exchanger 302.
In the cavity, the temperature of the gas phase coolant 203 is higher than that of the liquid phase coolant 202, the gas phase coolant 203 can be liquefied into the liquid phase coolant 202 by absorbing L NG cold, and the liquid phase coolant 202 can be vaporized into the gas phase coolant 203 by absorbing heat.
L NG air-conditioning refrigeration system, first open the second manual stop valve 402, the other part L NG flowing out from L NG storage tank 101 enters the cold accumulation pipeline inlet pipe 401 and flows into the upper heat exchanger 404 and exchanges heat with the gas phase cold accumulation agent 203 in the upper heat exchanger 404, the gas phase cold accumulation agent 203 fully contacting with the upper heat exchanger 404 absorbs L NG cold energy to liquefy, the liquefied gas phase cold accumulation agent 203 flows back to the liquid phase cold accumulation agent 202 by gravity, cold accumulation is realized, L NG after heat absorption is vaporized in the upper heat exchanger 404, L NG after vaporization enters the main medium pipeline 103 again through the cold accumulation pipeline outlet pipe 405, and then enters the power unit 105 to burn.
The L NG-based refrigeration system used in the prior art adopts a double-medium single-stage heat exchange scheme of directly exchanging heat between L NG and the secondary refrigerant 317. since the temperature of L NG is low (such as-150 ℃ or even lower), the heat exchange temperature difference between the L NG and the secondary refrigerant 317 is large (100-120 ℃), when the two exchanges heat, the secondary refrigerant 317 is inevitably condensed due to low temperature, and the pipeline of a heat exchanger is blocked.
In the three-medium high-temperature-difference heat exchanger 201, the gas-phase coolant 203 absorbs L NG cold energy to be liquefied continuously, the pressure in the accommodating cavity is gradually reduced, when the pressure is lower than the evaporation pressure of the liquid-phase coolant 202, the evaporation of the liquid-phase coolant 202 is accelerated, and the indirect transmission and storage of the cold energy are realized by repeating the steps in the above way, when the temperature of the liquid-phase coolant 202 detected by the first temperature sensor 206 is close to the solidification temperature (such as-60 ℃) of the coolant 317, the control system 501 adjusts the first electromagnetic regulating valve 403 on the cold accumulation pipeline inlet pipe 401, controls L NG to enter the upper heat exchanger 404, and realizes the control of cold energy input of the three-medium high-temperature-difference heat exchanger 201.
The air conditioning refrigeration unit includes a coolant line 307, a circulation pump 309, a fan coil heat exchange unit 304, and a coolant surge tank 306. The coolant pipeline 307, the circulating pump 309, the lower heat exchanger 302, the fan coil heat exchange unit 304 and the coolant buffer tank 306 are communicated through pipelines, and a coolant 317 is arranged in the pipeline of the air-conditioning refrigeration unit.
Fan-coil heat exchange unit 304 includes fan 314, coil heat exchanger 315, and heat exchange fins 306. The inlet end of the coil heat exchanger 315 is in communication with the outlet end of the lower heat exchanger 302 via a coil inlet tube 303, the outlet end of the coil heat exchanger 315 is in communication with the inlet end of the coolant surge tank 306 via a coil outlet tube 305, the outlet end of the coolant surge tank 306 is in communication with the inlet end of the circulation pump 309 via a coolant line 307, and the outlet end of the circulation pump 309 is in communication with the inlet end of the lower heat exchanger 302 via a pipe.
The fan 314 is arranged on one side of the coil heat exchanger 315, an air outlet is arranged on the other side of the coil heat exchanger 315, and the blowing direction of the fan 314 faces the coil heat exchanger 315.
The secondary refrigerant buffer tank 306 is used for temporarily storing the secondary refrigerant 317 in the air-conditioning refrigeration unit, and compensating the volume fluctuation of the secondary refrigerant 317 caused by the temperature change of the secondary refrigerant 317, so as to ensure the stable operation of the air-conditioning refrigeration unit.
When the air-conditioning refrigeration unit works, the control unit 501 controls the fan 314 and the circulating pump 309 to be started, the secondary refrigerant 317 circularly flows in the air-conditioning refrigeration unit under the action of the circulating pump 309, the secondary refrigerant 317 absorbs cold energy of the liquid-phase coolant 202 in the lower heat exchanger 302, the temperature of the secondary refrigerant 317 is reduced and then flows into the coil heat exchanger 315, the fan 314 forces air in the cooling space 301 to flow through the coil heat exchanger 315 and the heat exchange fins 316 for heat exchange, the air absorbs the cold energy of the secondary refrigerant 317, the temperature is reduced, the air is blown out from the air outlet, and the cooling space 301 is cooled. The control unit 501 is in control connection with the fan 314 and the circulation pump 309 and is capable of controlling the fan 314 and the circulation pump 309 to be turned on, turned off and adjusted in rotation speed.
In this embodiment, the circulation pump 309 is a variable frequency circulation pump 309, and the fan 314 is a variable frequency fan. The coil heat exchanger 315 is a finned tube heat exchanger, and the coil heat exchanger 315 is provided with heat exchange fins 316.
The utility model provides an L NG air conditioner refrigerating system uses three-medium high-temperature-difference heat exchanger 201 to retrieve L NG's cold energy as air conditioner refrigerating system's cold source, has eliminated the necessary high-power consumption part-compressor of conventional vapor compression refrigeration cycle, and three-medium high-temperature-difference heat exchanger 201 work does not consume any electric energy, does not need the maintenance, has very high economic effect and environmental protection effect compared with traditional refrigerating system.
The monitoring system comprises 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 electromagnetic regulating valve 403, a second electromagnetic regulating valve 104, a fan 314 and a circulating pump 309.
The control unit 501 is a device having data receiving and processing capabilities, the control unit 501 is in communication connection 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 313, and the control unit 501 is in control connection with the first electromagnetic regulating valve 403 and the second electromagnetic regulating valve 104.
Functionally, the monitoring system comprises 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 adjustment valve 403, a fan 314, and a circulation 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 for measuring the temperature of the liquid phase coolant 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, the third temperature sensor 311 is located between the outlet end of the coil heat exchanger 315 and the coolant buffer tank 306, the second temperature sensor 312 is configured to measure the temperature of the coolant 317 entering the coil heat exchanger 315, and the third temperature sensor 311 is configured to measure the temperature of the coolant 317 flowing out of the coil heat exchanger 315.
A fourth temperature sensor 313 is located in the cooling space 301 for measuring the temperature of the cooling space 301. a first electromagnetic adjusting valve 403 is provided on the cold storage piping inlet pipe 401, the first electromagnetic adjusting valve 403 is located between the second manual cut-off valve 402 and the inlet end of the upper heat exchanger 404, and the control unit 501 controls the L NG flow rate into the cold storage piping inlet pipe 401 through the first electromagnetic adjusting valve 403.
The pressure system comprises a pressure sensor 205, and the pressure sensor 205 is positioned on the three-medium high temperature difference heat exchanger 201 and is mainly used for monitoring the pressure of the gas phase coolant 203.
The liquid level system comprises a liquid level sensor 208, and the liquid level sensor 208 is positioned on the three-medium high temperature difference heat exchanger 201 and is mainly used for detecting the liquid level height of the liquid phase coolant 202.
The safety system comprises a safety valve 207, and the safety valve 207 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, and when the pressure of the gas phase coolant 203 exceeds the take-off threshold, the safety valve 207 automatically takes off and releases the pressure, so that the safe operation of the three-medium high temperature difference heat exchanger 201 is ensured.
When the power unit 105 and the air conditioning refrigeration system are simultaneously operated, as shown in fig. 1, the liquid phase coolant 202 absorbs heat of the coolant 317, the temperature is increased, and the coolant is continuously vaporized, and the gas phase coolant 203 absorbs cold of L NG and is continuously liquefied into the liquid phase coolant 202.
When the liquefaction rate of the gas phase coolant 203 is greater than the vaporization rate of the liquid phase coolant 202, the temperature of the liquid phase coolant 202 is lowered to the freezing temperature of the coolant 317, and at this time, the control unit 501 controls to decrease the opening degree of the first electromagnetic adjustment valve 403, so as to decrease the L NG flow rate entering the upper heat exchanger 404.
When the liquefaction rate of the gas phase coolant 203 is smaller than the vaporization rate of the liquid phase coolant 202, the temperature of the liquid phase coolant 202 will continuously rise, and at this time, the control unit 501 controls to increase the opening degree of the first electromagnetic adjusting valve 403, increase the L NG flow entering the upper heat exchanger 404, and improve the cold input.
As shown in fig. 3, in the cold accumulation process of the L NG air-conditioning refrigeration system, the control unit 501 controls the first electromagnetic regulating valve 403 on the cold accumulation pipeline inlet pipe 401 to open, the other part L NG flowing out from the L NG storage tank 101 flows into the upper heat exchanger 404 through the cold accumulation pipeline inlet pipe 401 and exchanges heat with the gas-phase cold accumulation agent 203 in the upper heat exchanger 404, the gas-phase cold accumulation agent 203 absorbs cold energy of L NG in the upper heat exchanger 404 to be liquefied, the liquefied gas-phase cold accumulation agent 203 flows back to the liquid-phase cold accumulation agent 202 by gravity to realize cold accumulation, when the temperature of the liquid-phase cold accumulation agent 202 detected by the first temperature sensor 206 is close to the freezing temperature (such as-60 ℃) of the secondary refrigerant, the control unit 501 closes the first electromagnetic regulating valve 403, the supply of L NG is stopped, the cold accumulation process is stopped, L NG absorbs heat in the upper heat exchanger 404, and the vaporized L enters the primary medium pipeline 103 again through the cold accumulation pipeline outlet pipe 317 and.
In the embodiment, the L NG air-conditioning refrigeration system also has a time delay refrigeration function.
When the power unit 105 stops working, the control unit 501 closes the first electromagnetic regulating valve 403 and the second electromagnetic regulating valve 104, and L NG stops entering the upper heat exchanger 404. because the low-temperature liquid-phase coolant 202 in the three-medium high temperature difference heat exchanger 201 stores a large amount of cold, the secondary refrigerant 317 can obtain the cold from the liquid-phase coolant 202 through the lower heat exchanger 302, and the air-conditioning refrigeration unit can still perform refrigeration operation, thereby realizing the effect of delayed refrigeration and having the function of cold storage and air conditioning.
In the cold storage air-conditioning refrigeration process, as shown in fig. 4, with the continuous operation of the air-conditioning refrigeration system, the temperature of the liquid phase coolant 202 gradually rises and is continuously vaporized into the gas phase coolant 203. When the first temperature sensor 206 detects that the temperature of the liquid-phase coolant 202 reaches the highest temperature (for example, 7 ℃) of the coolant 317 required by the fan coil heat exchange unit 304 to operate, the control unit 501 turns off the circulation pump 309, and the cold storage air conditioning refrigeration process is finished.
The control unit 501 obtains the temperature of the cooling space 301 through the fourth temperature sensor 313 and the temperatures of the refrigerants 317 before and after cooling through the second temperature sensor 312 and the third temperature sensor 311. When the control unit 501 monitors that the temperature of the air in the cooling space 301 reaches a set temperature, the control unit 501 finely controls the flow rate of the coolant 317 by adjusting the rotation speed of the circulating pump 309, and precisely controls the temperature in the cooling space 301 by analyzing the temperature data before and after the coolant 317 monitored by the third temperature sensor 311 and the fourth temperature sensor 312 flows through the fan coil heat exchange unit 304 for cooling. Meanwhile, the control unit 501 can adjust the rotation speed of the fan 314 to adjust the cooling rate of the cooling space 301.
According to another embodiment, the present invention further comprises a third manual shut-off valve 308, a fourth manual shut-off valve 310 and a coolant buffer tank 306.
A third manual cut-off valve 308 is provided on a pipe communicating with the inlet end of the circulation pump 309, and a fourth manual cut-off valve 310 is provided on a pipe communicating with the outlet end of the circulation pump 309. When the circulating pump 309 needs to be replaced or repaired, an operator can manually close the third manual stop valve 308 and the fourth manual stop valve 310 first, and then take out the circulating pump 309, so as to prevent the coolant 317 in the air-conditioning refrigeration unit from leaking;
the above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
Claims (5)
1. An L NG air-conditioning refrigeration system is characterized by comprising a L NG storage tank, a three-medium high temperature difference heat exchanger, an air-conditioning refrigeration unit and a control unit;
the L NG storage tank is used for storing L NG;
the three-medium high-temperature-difference heat exchanger comprises a shell, an upper heat exchanger and a lower heat exchanger, wherein a cavity is arranged in the shell, a cold storage agent with gas-liquid conversion characteristic is arranged in the cavity, the cold storage agent comprises a gaseous phase cold storage agent and a liquid phase cold storage agent, the upper heat exchanger is communicated with the L NG storage tank, the upper heat exchanger is positioned in the cavity and fully contacts with the gaseous phase cold storage agent, and the lower heat exchanger is positioned in the cavity and fully contacts with the liquid phase cold storage agent;
the air-conditioning refrigeration unit comprises a fan coil heat exchange unit and a circulating pump, and the fan coil heat exchange unit comprises a fan and a coil heat exchanger; the inlet end of the coil heat exchanger is communicated with the outlet end of the lower heat exchanger through a pipeline, the outlet end of the coil heat exchanger is communicated with the inlet end of the circulating pump through a pipeline, the outlet end of the circulating pump is connected with the inlet end of the lower heat exchanger through a pipeline, and secondary refrigerant is arranged in a loop formed by communicating the lower heat exchanger, the coil heat exchanger and the circulating pump;
the fan is positioned on one side of the coil heat exchanger, an air outlet is formed in the other side of the coil heat exchanger, and the blowing direction of the fan faces the coil heat exchanger; the control unit is in control connection with the circulating pump and the fan.
2. The L NG air-conditioning refrigeration system as claimed in claim 1, wherein:
the power unit is thermal energy application equipment taking natural gas as fuel, the power unit is communicated with the L NG storage tank through a main medium pipeline, and a first manual stop valve is arranged at one end, close to the L NG storage tank, of the main medium pipeline;
the inlet end of the upper heat exchanger is communicated with the main medium pipeline through a cold accumulation pipeline inlet pipe, the joint of the cold accumulation pipeline inlet pipe and the main medium pipeline is positioned between the first manual stop valve and the power unit, and a second manual stop valve is arranged on the cold accumulation pipeline inlet pipe;
the outlet end of the upper heat exchanger is communicated with the main medium pipeline through a cold accumulation pipeline outlet pipe, and the joint of the cold accumulation pipeline outlet pipe and the main medium pipeline is positioned between the joint of the cold accumulation pipeline inlet pipe and the main medium pipeline and the joint of the main medium pipeline and the power unit.
3. An L NG air conditioning refrigeration system as claimed in claim 2, wherein:
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, wherein the first temperature sensor is used for monitoring the temperature of the liquid phase coolant, the pressure sensor is used for monitoring the pressure of the gas phase coolant, the liquid level sensor is used for measuring the liquid level height of the liquid phase coolant, and the safety valve is used for automatically jumping and releasing pressure when the pressure of the gas phase coolant 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 is communicated 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.
4. An L NG air-conditioning refrigeration system as claimed in claim 3, wherein:
a first electromagnetic regulating valve is arranged on the cold accumulation pipeline inlet pipe and is positioned between the second manual stop valve and the inlet end of the upper heat exchanger;
a second electromagnetic regulating valve is arranged on the main medium pipeline and is positioned between the joint of the cold accumulation pipeline outlet pipe and the main medium pipeline and the joint of the cold accumulation pipeline inlet pipe and the main medium pipeline;
the control unit is in control connection with the first electromagnetic regulating valve and the second electromagnetic regulating valve;
and a third manual stop valve is arranged on a pipeline connected with the inlet end of the circulating pump, and a fourth manual stop valve is arranged on a pipeline connected with the outlet end of the circulating pump.
5. The L NG air-conditioning refrigeration system as claimed in claim 4, wherein:
the secondary refrigerant buffer tank is positioned between the third manual stop valve and the outlet end of the coil heat exchanger.
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| CN201922215397.7U CN211166331U (en) | 2019-12-12 | 2019-12-12 | L NG air conditioner refrigerating system |
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| CN201922215397.7U CN211166331U (en) | 2019-12-12 | 2019-12-12 | L NG air conditioner refrigerating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110802996A (en) * | 2019-12-12 | 2020-02-18 | 酷豹低碳新能源装备科技(常州)有限公司 | LNG air conditioner refrigerating system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110802996A (en) * | 2019-12-12 | 2020-02-18 | 酷豹低碳新能源装备科技(常州)有限公司 | LNG air conditioner refrigerating system |
| WO2021115137A1 (en) * | 2019-12-12 | 2021-06-17 | 蒋春辉 | Lng air conditioning refrigeration system |
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