CN115060028A - Method and equipment for controlling refrigerant liquid amount of carbon dioxide transcritical ice rink refrigerating system - Google Patents

Method and equipment for controlling refrigerant liquid amount of carbon dioxide transcritical ice rink refrigerating system Download PDF

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Publication number
CN115060028A
CN115060028A CN202210389263.0A CN202210389263A CN115060028A CN 115060028 A CN115060028 A CN 115060028A CN 202210389263 A CN202210389263 A CN 202210389263A CN 115060028 A CN115060028 A CN 115060028A
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carbon dioxide
liquid level
pressure
air cooler
expansion valve
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CN202210389263.0A
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CN115060028B (en
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刘楷
田华
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Tianjin University
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Tianjin University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25C—PRODUCING, WORKING OR HANDLING ICE
    • F25C3/00—Processes or apparatus specially adapted for producing ice or snow for winter sports or similar recreational purposes, e.g. for sporting installations; Producing artificial snow
    • F25C3/02—Processes or apparatus specially adapted for producing ice or snow for winter sports or similar recreational purposes, e.g. for sporting installations; Producing artificial snow for ice rinks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2309/00—Gas cycle refrigeration machines
    • F25B2309/06—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25C—PRODUCING, WORKING OR HANDLING ICE
    • F25C2400/00—Auxiliary features or devices for producing, working or handling ice
    • F25C2400/10—Refrigerator units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25C—PRODUCING, WORKING OR HANDLING ICE
    • F25C2600/00—Control issues
    • F25C2600/04—Control means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The application discloses a refrigerant liquid amount control method and device for a carbon dioxide transcritical ice rink refrigerating system, the carbon dioxide transcritical ice rink refrigerating system and a computer readable storage medium, and the method comprises the following steps: when a system starting instruction is received, acquiring low-pressure circulating barrel state parameters; when the state parameters of the low-pressure circulating barrel meet preset starting conditions, controlling the compressor unit to enter an operating state; acquiring the operating parameters of an insulating air cooler and a flash evaporator of a compressor unit in an operating state; adjusting the opening degree of the primary throttling electronic expansion valve according to the operation parameters of the heat-insulating air cooler so as to enable the carbon dioxide liquid level in the heat-insulating air cooler to be zero; and adjusting the opening degree of the secondary throttling electronic expansion valve according to the operating parameters of the flash evaporator so as to enable the carbon dioxide liquid level in the flash evaporator to reach a preset level value. By applying the technical scheme provided by the application, the safety problem caused by taking carbon dioxide as a refrigerant in the refrigeration system of the ice rink can be effectively solved.

Description

Method and equipment for controlling refrigerant liquid amount of carbon dioxide transcritical ice rink refrigerating system
Technical Field
The application relates to the technical field of refrigeration, in particular to a method and a device for controlling the amount of refrigerant liquid of a carbon dioxide transcritical ice rink refrigeration system, the carbon dioxide transcritical ice rink refrigeration system and a computer readable storage medium.
Background
With the rise of social development and public requirements on living level, ice and snow sports are favored by more and more people, and in order to promote the development of ice sports, it is important to construct an intelligent artificial ice field. Because carbon dioxide is a natural working medium, the carbon dioxide is used as a refrigerant to realize the refrigeration of the ice field, so that the ice field is more environment-friendly and green. However, carbon dioxide has a critical temperature as low as 31.1 ℃ and a higher pressure than other refrigerants, and therefore there is a great safety risk.
Therefore, how to solve the safety problem caused by using carbon dioxide as a refrigerant in the refrigeration system of the ice rink to effectively reduce the safety risk is a problem to be solved by those skilled in the art.
Disclosure of Invention
The method for controlling the refrigerant liquid amount of the carbon dioxide transcritical ice field refrigerating system can effectively solve the safety problem caused by taking carbon dioxide as a refrigerant in the ice field refrigerating system; another object of the present application is to provide a refrigerant liquid amount control device of a carbon dioxide transcritical ice rink refrigeration system, a carbon dioxide transcritical ice rink refrigeration system and a computer readable storage medium, all of which have the above advantages.
In a first aspect, the present application provides a method for controlling the amount of refrigerant liquid in a carbon dioxide transcritical ice rink refrigeration system, comprising:
when a system starting instruction is received, acquiring low-pressure circulating barrel state parameters;
when the state parameters of the low-pressure circulating barrel meet preset starting conditions, controlling the compressor unit to enter an operating state;
under the operating state, acquiring operating parameters of an adiabatic air cooler and operating parameters of a flash evaporator of the compressor unit;
adjusting the opening degree of a primary throttling electronic expansion valve according to the operation parameters of the heat-insulating air cooler so as to enable the liquid level of carbon dioxide in the heat-insulating air cooler to be zero;
and adjusting the opening degree of the secondary throttling electronic expansion valve according to the operating parameters of the flash evaporator so as to enable the carbon dioxide liquid level in the flash evaporator to reach a preset liquid level value.
Optionally, the low-pressure circulation barrel state parameter includes a low-pressure circulation barrel refrigerant liquid level, and when the low-pressure circulation barrel state parameter satisfies a preset starting condition, the low-pressure circulation barrel state parameter controls the compressor unit to enter an operating state, including:
and when the liquid level of the refrigerant in the low-pressure circulating barrel reaches the sum of the preset minimum liquid level and the preset liquid level return difference, controlling the compressor unit to enter an operating state.
Optionally, the method for controlling the amount of the refrigerant liquid in the carbon dioxide transcritical ice rink refrigeration system further comprises:
under the running state, acquiring the liquid level of the refrigerant of the low-pressure circulating barrel in real time;
and when the liquid level of the refrigerant in the low-pressure circulating barrel reaches the preset highest liquid level, outputting a high liquid level alarm signal.
Optionally, the method for controlling the amount of the refrigerant liquid in the carbon dioxide transcritical ice rink refrigeration system further comprises:
under the running state, acquiring the pressure value of the low-pressure circulating barrel in real time;
when the pressure value of the low-pressure circulating barrel reaches a preset highest pressure value, controlling the compressor unit to stop running;
and under the condition that the compressor unit stops running, if the pressure value of the low-pressure circulating barrel is lower than the difference value between the preset highest pressure value and the preset pressure return difference, controlling the compressor unit to restart.
Optionally, the operating parameters of the adiabatic gas cooler include an outlet temperature of the adiabatic gas cooler, and the adjusting the opening degree of the primary throttling electronic expansion valve according to the operating parameters of the adiabatic gas cooler to make the carbon dioxide liquid level in the adiabatic gas cooler zero includes:
determining a target value of an outlet pressure of the heat insulation air cooler according to the outlet temperature of the heat insulation air cooler;
and adjusting the opening degree of the primary throttling electronic expansion valve so as to enable the outlet pressure of the heat insulation air cooler to reach the target value.
Optionally, before adjusting the opening degree of the primary throttle electronic expansion valve so that the outlet pressure of the adiabatic air cooler reaches the target value, the method further includes:
when the target value is lower than a preset lowest threshold value, regulating the primary throttling electronic expansion valve to be closed;
when the target value reaches a preset highest threshold value, adjusting the opening degree of the primary throttling electronic expansion valve to the maximum opening degree;
and when the target value is between the preset lowest threshold value and the preset highest threshold value, performing the step of adjusting the opening degree of the primary throttling electronic expansion valve so that the outlet pressure of the heat-insulating air cooler reaches the target value.
Optionally, the operating parameters of the flash evaporator include a set flash vapor liquid level value, and the adjusting the opening degree of the secondary throttling electronic expansion valve according to the operating parameters of the flash evaporator to make the carbon dioxide liquid level in the flash evaporator reach a liquid seal includes:
and adjusting the opening degree of the secondary throttling electronic expansion valve to the opening degree corresponding to the set value of the flash gas liquid level according to the mapping relation between the flash gas liquid level and the opening degree of the secondary throttling electronic expansion valve.
In a second aspect, the present application provides a refrigerant liquid amount control device for a carbon dioxide transcritical ice field refrigeration system, comprising:
the low-pressure circulating barrel state parameter acquiring module is used for acquiring low-pressure circulating barrel state parameters when a system starting instruction is received;
the compressor unit operation module is used for controlling the compressor unit to enter an operation state when the state parameters of the low-pressure circulation barrel meet preset starting conditions;
the compressor unit operation parameter acquisition module is used for acquiring the operation parameters of the heat insulation air cooler and the flash evaporator of the compressor unit in the operation state;
the primary throttling electronic expansion valve adjusting module is used for adjusting the opening degree of the primary throttling electronic expansion valve according to the operation parameters of the heat insulation air cooler so as to enable the liquid level of carbon dioxide in the heat insulation air cooler to be zero;
and the secondary throttling electronic expansion valve adjusting module is used for adjusting the opening degree of the secondary throttling electronic expansion valve according to the operating parameters of the flash evaporator so as to enable the carbon dioxide liquid level in the flash evaporator to reach a preset liquid level value.
In a third aspect, the present application provides a carbon dioxide transcritical ice rink refrigeration system comprising:
a memory for storing a computer program;
and a processor for implementing the steps of any one of the above-mentioned methods for controlling the amount of refrigerant liquid in the carbon dioxide transcritical ice rink refrigeration system when executing the computer program.
In a fourth aspect, the present application provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of any one of the above-described methods for controlling the amount of refrigerant liquid in a carbon dioxide transcritical ice field refrigeration system.
The method for controlling the refrigerant liquid amount of the carbon dioxide transcritical ice rink refrigerating system comprises the steps of obtaining low-pressure circulation barrel state parameters when a system starting instruction is received; when the state parameters of the low-pressure circulating barrel meet preset starting conditions, controlling the compressor unit to enter an operating state; under the operating state, acquiring operating parameters of an adiabatic air cooler and operating parameters of a flash evaporator of the compressor unit; adjusting the opening degree of a primary throttling electronic expansion valve according to the operation parameters of the heat-insulating air cooler so as to enable the liquid level of carbon dioxide in the heat-insulating air cooler to be zero; and adjusting the opening degree of the secondary throttling electronic expansion valve according to the operating parameters of the flash evaporator so as to enable the carbon dioxide liquid level in the flash evaporator to reach a preset level value. By applying the technical scheme provided by the application, when a starting instruction for starting the carbon dioxide transcritical ice rink refrigerating system to refrigerate the ice rink is received, the state parameters of the low-pressure circulating barrel are obtained, and when the state parameters of the low-pressure circulating barrel meet the preset starting conditions, the compressor unit is controlled to enter the running state, in the running process of the compressor unit, the running parameters of the compressor unit, including the running parameters of the heat-insulating air cooler and the running parameters of the flash evaporator, are obtained, so that the opening degree of the primary throttling electronic expansion valve and the opening degree of the secondary throttling electronic expansion valve are adjusted, the carbon dioxide liquid level in the heat-insulating air cooler is zero, the carbon dioxide liquid level in the flash evaporator reaches the preset liquid level value which only meets the liquid seal of the flash evaporator, the purpose of reducing the filling amount of the carbon dioxide refrigerant as far as possible is achieved, and the safety risk is effectively reduced.
The refrigerant liquid amount control device of the carbon dioxide transcritical ice rink refrigerating system, the carbon dioxide transcritical ice rink refrigerating system and the computer readable storage medium provided by the application all have the beneficial effects, and are not repeated herein.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the technical solutions in the prior art and the embodiments of the present application, the drawings that are needed to be used in the description of the prior art and the embodiments of the present application will be briefly described below. Of course, the following description of the drawings related to the embodiments of the present application is only a part of the embodiments of the present application, and it will be obvious to those skilled in the art that other drawings can be obtained from the provided drawings without any creative effort, and the obtained other drawings also belong to the protection scope of the present application.
Fig. 1 is a schematic flow chart of a method for controlling the amount of refrigerant liquid in a carbon dioxide transcritical ice field refrigeration system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a refrigerant liquid amount control device of a carbon dioxide transcritical ice field refrigeration system according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the method for controlling the amount of the refrigerant liquid of the carbon dioxide transcritical ice field refrigeration system provided by the present application can be implemented by the carbon dioxide transcritical ice field refrigeration system, and the carbon dioxide transcritical ice field refrigeration system can include a carbon dioxide refrigerant pump, an ice field heat exchange coil, a low-pressure circulation barrel and a compressor unit (such as a parallel compressor unit, a bipolar compressor unit, etc.), the carbon dioxide refrigerant pump, the ice field heat exchange coil and the compressor unit are all connected to the low-pressure circulation barrel, and the carbon dioxide refrigerant pump is connected to the ice field heat exchange coil, so that the ice field refrigeration can be implemented based on the ice field refrigeration equipment.
The carbon dioxide refrigerant pump and the ice field refrigeration process are started and stopped simultaneously, namely, when the carbon dioxide refrigerant pump is started, the carbon dioxide transcritical ice field refrigeration system starts to operate to perform ice field refrigeration, and when the carbon dioxide refrigerant pump stops, the carbon dioxide transcritical ice field refrigeration system stops operating to finish the ice field refrigeration.
The implementation process of ice rink refrigeration based on the carbon dioxide transcritical ice rink refrigeration system comprises the following steps: firstly, after a carbon dioxide refrigerant pump is started, power is provided for transmitting liquid carbon dioxide, and the liquid carbon dioxide stored in a low-pressure circulating barrel is transmitted to a heat exchange coil of an ice field; secondly, the ice field heat exchange coil is used for realizing ice field refrigeration, so that heat exchange can be started to realize the ice field refrigeration after the ice field heat exchange coil receives the liquid carbon dioxide conveyed by the carbon dioxide refrigerant pump, and meanwhile, the liquid carbon dioxide is converted into gas-liquid mixed carbon dioxide in the ice field refrigeration process; further, the gas-liquid mixed carbon dioxide is conveyed back to the low-pressure circulating barrel by the ice field heat exchange coil, the low-pressure circulating barrel has a gas-liquid separation function, and can perform gas-liquid separation on the gas-liquid mixed carbon dioxide to obtain liquid carbon dioxide and gaseous carbon dioxide, wherein the liquid carbon dioxide is stored in the low-pressure circulating barrel and is used for continuously conveying the liquid carbon dioxide to the ice field heat exchange coil to realize ice field refrigeration, and the gaseous carbon dioxide is conveyed to the compressor unit to be processed; and finally, the compressor unit compresses the gaseous carbon dioxide into liquid carbon dioxide, and transmits the liquid carbon dioxide back to the low-pressure circulating barrel for continuously conveying the liquid carbon dioxide to the ice rink heat exchange coil to realize ice rink refrigeration. Therefore, the circulation of the carbon dioxide in the refrigeration process of the ice field is completed, and the refrigeration of the ice field based on the carbon dioxide refrigerant is realized.
The compressor unit can comprise a first compressor, a second compressor, a first heat regenerator, a second heat regenerator, a flash evaporator and an insulating air cooler, wherein the first heat regenerator, the second heat regenerator and the insulating air cooler are all connected to the flash evaporator; the first compressor is connected with the first heat regenerator; the second compressor is connected with the second heat regenerator; the first compressor and the second compressor are both connected to the heat insulation air cooler; the compressor unit is connected with the low-pressure circulating barrel through the first heat regenerator. Illustratively, when the compressor unit is a parallel compressor unit, the first compressor and the second compressor are a main piston compressor and a parallel piston compressor, respectively; when the compressor unit is a two-stage compressor unit, the first compressor and the second compressor are respectively a low-pressure stage piston compressor and a high-pressure stage piston compressor.
The implementation process of compressing gaseous carbon dioxide into liquid carbon dioxide based on the compressor unit comprises the following steps: firstly, the gaseous carbon dioxide separated by the low-pressure circulating barrel is conveyed to a first heat regenerator, the gaseous carbon dioxide and the medium-pressure liquid carbon dioxide conveyed by the flash evaporator are subjected to heat exchange by the first heat regenerator, and the superheated low-temperature low-pressure gaseous carbon dioxide subjected to heat exchange is conveyed to a first compressor to be compressed. The flash evaporator is used for realizing gas-liquid separation, so that when the medium-pressure liquid carbon dioxide obtained through gas-liquid separation is conveyed to the first heat regenerator, the superheated medium-pressure gaseous carbon dioxide obtained through gas-liquid separation is conveyed to the second heat regenerator, and the superheated medium-pressure gaseous carbon dioxide is subjected to heat exchange by the second heat regenerator and then conveyed to the second compressor for compression. Further, the exhaust gas (carbon dioxide) compressed by the first compressor and the exhaust gas (carbon dioxide) compressed by the second compressor are both sent to the adiabatic gas cooler for cooling. And finally, the carbon dioxide cooled by the heat insulation air cooler is conveyed to a flash evaporator for gas-liquid separation, the separated gaseous carbon dioxide enters a second compressor for air suction after being heated by a second heat regenerator, and the separated liquid carbon dioxide enters a low-pressure circulating barrel after being supercooled by a first heat regenerator. Thereby, the realization flow of compressing gaseous carbon dioxide based on the compressor set is completed.
And a secondary throttling electronic expansion valve is arranged on a connecting pipeline between the first heat regenerator and the low-pressure circulating barrel, and a primary throttling electronic expansion valve is arranged on a connecting pipeline between the second heat regenerator and the flash evaporator. Therefore, the liquid amount of the carbon dioxide refrigerant can be controlled by controlling the opening degree of the electronic throttle expansion valve.
Based on the carbon dioxide transcritical ice rink refrigeration system, the embodiment of the application provides a refrigerant liquid amount control method of the carbon dioxide transcritical ice rink refrigeration system.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a method for controlling a refrigerant liquid amount of a carbon dioxide transcritical ice field refrigeration system according to an embodiment of the present disclosure, where the method for controlling the refrigerant liquid amount of the carbon dioxide transcritical ice field refrigeration system includes steps S101 to S105.
S101: when a system starting instruction is received, acquiring low-pressure circulating barrel state parameters;
this step is intended to perform the acquisition of the low-pressure circulation tank state parameters based on the received system start instruction. The system starting instruction is used for starting the carbon dioxide trans-critical ice rink refrigerating system to refrigerate the ice rink, and after the instruction is received, the operation parameters of the low-pressure circulating barrel can be obtained, and the process can be realized through corresponding sensor equipment. The low-pressure circulation barrel state parameters are used for realizing starting condition judgment, namely judging whether preset conditions for starting the carbon dioxide trans-critical ice rink refrigerating system are met or not at present, and specific contents of the low-pressure circulation barrel state parameters are set by technical personnel according to actual requirements.
S102: when the state parameters of the low-pressure circulating barrel meet preset starting conditions, controlling the compressor unit to enter an operating state;
this step is intended to achieve the start-up of the carbon dioxide transcritical ice rink refrigeration system so that the compressor unit enters an operational state. Specifically, the state parameters of the low-pressure circulating bucket can be obtained in real time, when the condition that the parameters meet the preset starting condition is monitored, the carbon dioxide transcritical ice field refrigerating system can be started, and after the carbon dioxide transcritical ice field refrigerating system is started, the compressor unit also enters the running state. The preset starting condition is the condition that the carbon dioxide transcritical ice rink refrigerating system can be started, and the technical personnel can set the condition according to the actual condition.
S103: under the operating state, acquiring operating parameters of an adiabatic air cooler and operating parameters of a flash evaporator of the compressor unit;
the method comprises the following steps of obtaining operation parameters of the compressor unit in an operation state, wherein the operation parameters comprise operation parameters of the heat insulation air cooler and operation parameters of the flash evaporator, so that liquid amount control of the carbon dioxide refrigerant can be realized according to the parameters. The specific content of the operation parameters of the insulating air cooler and the flash evaporator can be set by a technician according to actual conditions, which is not limited in the present application, and the liquid amount of the carbon dioxide refrigerant can be controlled, for example, the specific content may include data information such as outlet temperature and outlet pressure of the insulating air cooler, outlet temperature and outlet pressure of the flash evaporator, and the like.
S104: adjusting the opening degree of a primary throttling electronic expansion valve according to the operation parameters of the heat-insulating air cooler so as to enable the liquid level of carbon dioxide in the heat-insulating air cooler to be zero;
s105: and adjusting the opening degree of the secondary throttling electronic expansion valve according to the operating parameters of the flash evaporator so as to enable the carbon dioxide liquid level in the flash evaporator to reach a preset level value.
The steps aim at realizing the adjustment of the opening degree of the throttle electronic expansion valve based on the operation parameters of the compressor unit in the operation state so as to achieve the purpose of reducing the filling amount of the carbon dioxide refrigerant. Specifically, the opening degree of the primary throttling electronic expansion valve can be adjusted according to the operation parameters of the heat-insulating air cooler, and the adjustment target is that the carbon dioxide liquid level in the heat-insulating air cooler is zero; and adjusting the opening degree of the secondary throttling electronic expansion valve according to the operating parameters of the flash evaporator, wherein the adjustment target is that the carbon dioxide liquid level in the flash evaporator reaches a preset level value, wherein the preset level value is a level value which only meets the condition that the flash evaporator reaches a liquid seal. That is to say, the opening degree of the throttle electronic expansion valve is adjusted, so that the heat insulation air cooler and the flash evaporator do not store liquid or hardly store liquid, and therefore, the purpose of effectively reducing the filling amount of the carbon dioxide refrigerant can be achieved, and the safety risk is further reduced.
Therefore, the ice rink refrigeration method provided by the embodiment of the application obtains the state parameters of the low-pressure circulating bucket when receiving the starting instruction for starting the carbon dioxide transcritical ice rink refrigeration system to perform ice rink refrigeration, and controls the compressor unit to enter the running state when the state parameters of the low-pressure circulating barrel meet the preset starting conditions, in the operation process of the compressor unit, the opening degree of the primary throttling electronic expansion valve and the opening degree of the secondary throttling electronic expansion valve are adjusted by obtaining the operation parameters of the compressor unit, including the operation parameters of the heat-insulating air cooler and the operation parameters of the flash evaporator, so that the liquid level of carbon dioxide in the heat-insulating air cooler is zero, and the carbon dioxide liquid level in the flash evaporation gas reaches the preset liquid level value only meeting the flash evaporation gas liquid seal, so that the aim of reducing the filling amount of the carbon dioxide refrigerant as far as possible is fulfilled, and the safety risk is effectively reduced.
On the basis of the above-described embodiment:
in an embodiment of the present application, the low-pressure circulation barrel state parameter may include a low-pressure circulation barrel refrigerant liquid level, and the controlling the compressor unit to enter the operating state when the low-pressure circulation barrel state parameter satisfies the preset starting condition may include: and when the liquid level of the refrigerant in the low-pressure circulating barrel reaches the sum of the preset lowest liquid level and the preset liquid level return difference, controlling the compressor unit to enter the running state.
The embodiment of the application provides a system starting condition judging method, and specifically, the low-pressure circulation barrel state parameters can comprise a low-pressure circulation barrel refrigerant liquid level, so that when the low-pressure circulation barrel refrigerant liquid level reaches the sum of the preset minimum liquid level and the preset liquid level return difference, the current state can be judged to meet the system starting condition, at the moment, a carbon dioxide transcritical ice rink refrigerating system can be started, and a compressor unit can enter the running state. On the contrary, if the liquid level of the refrigerant in the low-pressure circulating barrel does not reach the sum of the difference between the preset lowest liquid level and the preset liquid level, the current state can be judged to not meet the starting condition, at the moment, the carbon dioxide transcritical ice rink refrigerating system is not started, and the compressor unit can not enter the running state.
As described above, the carbon dioxide refrigerant pump and the ice rink refrigeration process are started and stopped at the same time, so that the preset lowest liquid level is the lowest liquid level allowing the carbon dioxide refrigerant pump to be started, the preset liquid level return difference is the pump-on liquid level return difference, the specific values of the two can be set by technical personnel according to actual conditions, and the application does not limit the liquid level.
In an embodiment of the present application, the method for controlling the amount of refrigerant liquid in a carbon dioxide transcritical ice field refrigeration system may further include: under the running state, the liquid level of the refrigerant of the low-pressure circulating barrel is obtained in real time; and when the liquid level of the refrigerant in the low-pressure circulating barrel reaches the preset highest liquid level, outputting a high liquid level alarm signal.
It can be understood that, when the low pressure circulation bucket refrigerant liquid level is too high, certain safety risk will be brought certainly, therefore, the highest liquid level of reporting an emergency and asking for help or increased vigilance of presetting, the above-mentioned highest liquid level of presetting, under compressor unit running state, also be in the ice rink refrigeration process, can carry out real-time supervision to low pressure circulation bucket refrigerant liquid level, and compare it with the highest liquid level of presetting, in case monitor that low pressure circulation bucket refrigerant liquid level reaches the highest liquid level of presetting, then can output high liquid level alarm signal immediately, and in time inform technical staff that present low pressure circulation bucket refrigerant liquid level is too high, there is safety risk, be convenient for technical staff in time to take protective measures. Similarly, the specific value of the preset maximum liquid level is also set by a technician according to the actual situation, and the application does not limit the specific value.
In an embodiment of the present application, the method for controlling the amount of refrigerant liquid in a carbon dioxide transcritical ice field refrigeration system may further include: under the running state, acquiring the pressure value of the low-pressure circulating barrel in real time; when the pressure value of the low-pressure circulating barrel reaches a preset highest pressure value, controlling the compressor unit to stop running; and under the condition that the compressor unit stops running, if the pressure value of the low-pressure circulating barrel is lower than the difference value between the preset highest pressure value and the preset pressure return difference, controlling the compressor unit to restart.
In order to effectively ensure the safe operation of the carbon dioxide trans-critical ice rink refrigerating system, the pressure value of the low-pressure circulating barrel can be monitored in real time, so that the start and stop of the compressor unit are controlled according to the pressure value of the low-pressure circulating barrel, and the safety risk caused by the overhigh pressure of the low-pressure circulating barrel is avoided. In the implementation process, when the pressure value of the low-pressure circulating barrel is monitored to reach the preset highest pressure value, the compressor unit can be controlled to stop running, and the step of controlling the compressor unit to stop running specifically comprises the step of controlling the carbon dioxide refrigerant pump to stop running; further, under the condition that the compressor unit stops operating, if the pressure value of the low-pressure circulating barrel is monitored to be lower than the difference value between the preset highest pressure value and the preset pressure return difference, the compressor unit is controlled to restart, and similarly, the control of restarting the compressor unit is specifically to control restarting of the carbon dioxide refrigerant pump.
Similar to above-mentioned minimum liquid level of predetermineeing and predetermine the liquid level return difference, predetermine the maximum pressure value and predetermine the concrete value of liquid level return difference and all can be set for by technical staff according to actual conditions, this application does not do the injecture to this.
Of course, the monitoring of the liquid level of the low-pressure circulation barrel and the pressure of the low-pressure circulation barrel is only one implementation manner provided by the application, is not unique, and can also monitor other parameters (such as a current signal of a carbon dioxide refrigerant pump) according to actual conditions so as to ensure the safe operation of the carbon dioxide transcritical ice field refrigeration system,
in one embodiment of the present application, the adiabatic air cooler operating parameter may include an adiabatic air cooler outlet temperature, and the adjusting the opening degree of the primary throttle electronic expansion valve according to the adiabatic air cooler operating parameter to make the carbon dioxide liquid level in the adiabatic air cooler zero may include: determining a target value of an outlet pressure of the insulating air cooler according to the outlet temperature of the insulating air cooler; and adjusting the opening degree of the primary throttling electronic expansion valve to enable the outlet pressure of the heat insulation air cooler to reach a target value.
The embodiment of the application provides a method for adjusting the opening degree of a primary throttling electronic expansion valve based on the operation parameters of an insulating air cooler, wherein the operation parameters of the insulating air cooler can include the outlet temperature of the insulating air cooler, so that the opening degree of the primary throttling electronic expansion valve can be adjusted according to the outlet temperature of the insulating air cooler, and the outlet temperature of the insulating air cooler can be acquired through a temperature sensor. In the implementation process, after the outlet temperature of the insulating air cooler is acquired, a target value of the outlet pressure of the insulating air cooler (which can be implemented based on a pre-established calculation rule) can be calculated according to the outlet temperature of the insulating air cooler, and the target value of the outlet pressure of the insulating air cooler is an outlet pressure value of the insulating air cooler, which makes the carbon dioxide liquid level in the insulating air cooler zero.
In an embodiment of the application, before adjusting the opening degree of the primary throttling electronic expansion valve to make the outlet pressure of the adiabatic air cooler reach the target value, the method may further include: when the target value is lower than a preset lowest threshold value, regulating the primary throttling electronic expansion valve to be closed; when the target value reaches a preset highest threshold value, adjusting the opening degree of the primary throttling electronic expansion valve to the maximum opening degree; and when the target value is between the preset lowest threshold value and the preset highest threshold value, executing the step of adjusting the opening degree of the primary throttling electronic expansion valve so as to enable the outlet pressure of the heat insulation air cooler to reach the target value.
In order to ensure the safe operation of the refrigerating system of the compressor unit ice field, after the target value of the outlet pressure of the heat-insulating air cooler is obtained through calculation, threshold value comparison can be carried out on the target value, and the opening degree of the primary throttling electronic expansion valve can be adjusted according to the comparison result so as to ensure the adjustment efficiency. In the specific implementation process, if the target value is too low, namely lower than a preset lowest threshold value, the primary throttling electronic expansion valve can be directly controlled to be closed; if the target value is too high, namely the preset highest threshold value is reached, the opening degree of the primary throttling electronic expansion valve can be directly controlled to reach 100 percent, namely the maximum opening degree; if the target value is between the preset lowest threshold value and the preset highest threshold value, the step of adjusting the opening degree of the primary throttle electronic expansion valve is executed again so that the outlet pressure of the heat insulation air cooler reaches the target value. The preset minimum threshold value and the preset maximum threshold value are respectively a preset minimum allowable adiabatic air cooler outlet pressure value and a preset maximum allowable adiabatic air cooler outlet pressure value, and both can be set by technical personnel according to actual conditions to be specific values, and the application does not limit the values.
In one embodiment of the present application, the adjusting the opening degree of the secondary throttling electronic expansion valve according to the operating parameters of the flash evaporator to make the carbon dioxide liquid level in the flash evaporator reach the preset level value may include: and adjusting the opening degree of the secondary throttling electronic expansion valve to the opening degree corresponding to the set value of the flash gas liquid level according to the mapping relation between the flash gas liquid level and the opening degree of the secondary throttling electronic expansion valve.
The embodiment of the application provides a method for adjusting the opening degree of a secondary throttling electronic expansion valve based on operating parameters of a flash evaporator, wherein the operating parameters of the flash evaporator can comprise a set value of the liquid level of the flash evaporator, so that the opening degree of the secondary throttling electronic expansion valve can be adjusted according to the set value of the liquid level of the flash evaporator, and the set value of the liquid level of the flash evaporator is preset by a technical worker according to actual ice making requirements and can meet the liquid level value of the liquid seal of the flash evaporator. In the implementation process, a mapping relation between the flash vapor liquid level and the opening degree of the secondary throttling electronic expansion valve can be created in advance, and generally, the higher the flash vapor liquid level is, the larger the opening degree of the secondary throttling electronic expansion valve is; further, after the liquid level set value of the flash evaporator is determined, the opening degree of the secondary throttling electronic expansion valve can be adjusted to the opening degree corresponding to the liquid level set value of the flash evaporation gas, and therefore, under the operation state, almost no liquid is stored in the flash evaporation gas and only liquid seal is met.
On the basis of the above embodiments, the present application provides another method for controlling the amount of carbon dioxide refrigerant in a compressor unit.
In the embodiment of the application, aiming at the carbon dioxide transcritical ice rink refrigerating system, in order to achieve the purpose of reducing the filling amount of the carbon dioxide as much as possible, the adopted technical scheme comprises the following steps: the high-pressure part does not store liquid by utilizing a primary throttling electronic expansion valve control strategy, namely the heat-insulating air cooler does not store liquid; the secondary throttling electronic expansion valve control strategy is utilized to ensure that the medium-pressure part does not store liquid, namely, the flash evaporator does not store liquid and only needs to meet liquid seal; the use of the CO2 refrigerant pump control logic strategy allows the low pressure portion to surge for liquid storage, i.e., the CO2 charge only needs to meet the low pressure cycle drum level at which the CO2 refrigerant pump can continue to operate during high day operation and night ice rink maintenance load.
The specific implementation process of each control strategy comprises the following steps:
1. control logic of the primary throttling electronic expansion valve under ice making condition: the implementation process is controlled according to the outlet temperature t5 of the insulated air cooler and the outlet pressure P5 of the insulated air cooler, and may include:
(1) and setting a minimum allowable adiabatic air cooler outlet pressure value to be 40bar, and closing the primary throttling electronic expansion valve when P5 is less than 40 bar.
(2) And setting the maximum allowable outlet pressure value of the insulating air cooler to be 92bar, and setting the opening degree of the primary throttling electronic expansion valve to be 100% when P5 is equal to or larger than 92 bar.
(3) And when the outlet temperature t5 of the heat-insulating air cooler is less than 26 ℃, controlling according to a set value of the supercooling degree, and carrying out PI proportional integral control on a CO2 saturated pressure value P5 corresponding to the outlet pressure value t5+ the supercooling degree set value tl of the heat-insulating air cooler, wherein the saturated pressure value P5 is 4 multiplied by 10 < -5 > (t5+ tl) < 3+0.0092 > (t5+ tl) < 2+0.9259 > (t5+ tl) + 33.821.
(4) When the outlet temperature of the air cooler is less than or equal to 26 and less than or equal to t5 and less than or equal to 31 ℃, the control is carried out according to the linear interpolation of a transition region, the pressure value at 26 ℃ is 4 multiplied by 10^ (5) × (26+ tl) ^3+0.0092 ^ (26+ tl) ^2+0.9259 × (26+ tl) +33.821 corresponding to the CO2 saturated pressure value P5 corresponding to the 26+ supercooling degree set value, and the pressure value at 31 ℃ is 74, and PI proportional integral control is carried out.
(5) When the outlet temperature t5 of the air cooler is more than 31 ℃, the control is carried out according to the optimal exhaust pressure, to is the saturation temperature corresponding to the air suction set value of the high-pressure stage, and P5 is 9.8 (2.778-0.0157 Xto) multiplied by t5+ (0.381 Xto-9.34) -1 calculated value to carry out PI proportional integral control P5.
2. Control logic of the secondary throttle electronic expansion valve: PID control is carried out according to a set value of a liquid level L1 of a liquid level sensor of the flash evaporator, and the realization process comprises the following steps:
(1) the larger the liquid level L1 of the flash evaporator liquid level sensor is, the larger the opening degree of the secondary throttle electronic expansion valve is, and on the contrary, the opening degree of the secondary throttle electronic expansion valve is reduced.
(2) The liquid level in the flash evaporator is only required to meet the requirement of forming a liquid seal in the flash evaporator so as to reduce the filling amount of CO2 to the maximum extent.
3. Control logic for CO2 refrigerant pump: the control is carried out according to the liquid level L2 of the low-pressure circulating barrel, and the implementation process comprises the following steps:
(1) the CO2 refrigerant pump is on and off with the ice maker set.
(2) Setting the lowest liquid level Ld and the return difference L of the starting liquid level of the CO2 pump, wherein when the CO2 pump obtains a starting signal but L2 is less than Ld, the CO2 pump is not started; when the CO2 pump receives an on signal but L2 ≧ Ld + L, the CO2 pump is turned on.
(3) Collecting a CO2 current signal, setting a minimum current allowed by CO2, stopping a CO2 pump when the current of the CO2 pump in operation is lower than a minimum current set value allowed by CO2, and delaying an allowed start signal.
(4) And setting the highest allowable pressure value of the low-pressure circulating barrel, stopping the operation of the CO2 pump when the actual pressure value of the low-pressure circulating barrel is larger than or equal to the highest allowable pressure value of the low-pressure circulating barrel, and delaying and then providing a CO2 opening signal when the actual pressure value of the low-pressure circulating barrel is smaller than the highest allowable pressure value of the low-pressure circulating barrel and a return difference value.
(5) The CO2 refrigerant pump operates in a variable frequency mode, and the night ice-keeping mode can be set according to time to operate at a low frequency.
(6) When the liquid level L2 of the low-pressure circulating barrel reaches a high liquid level set value, a high liquid level alarm signal is sent out.
Therefore, based on the control logic, the purpose of reducing the carbon dioxide filling amount as much as possible is achieved, and the safety risk is effectively reduced.
On this basis, in order to further improve the security, can also carry out the accurate design to low pressure part pipe-line system, mainly include low pressure circulation bucket to ice surface liquid supply pipeline, supply liquid collector, ice surface heat exchange coil pipe, return-air collector and return-air pipeline etc. corresponding design content specifically can be:
1. according to the technical characteristics of an ice rink, the ice surface temperature is required to be uniform, namely, the refrigerant of each branch of the ice surface heat exchange coil is required to be uniformly distributed, and the refrigeration heat exchange coils of each branch supply the same temperature. The solution is better by adopting a CO2 pump to supply liquid, but the liquid supply of the CO2 pump can increase the filling amount of a CO2 refrigerant, and certainly, the larger the liquid supply circulation rate of the CO2 pump is, the better the distribution uniformity of the refrigerant of each branch of the ice surface heat exchange coil is, the more the liquid amount of the CO2 which is not subjected to heat exchange and evaporation of each branch of the refrigeration heat exchange coil is, the more the temperature of the refrigeration heat exchange coil supplied by each branch is consistent, and the larger the pipe diameter of the corresponding low-pressure part pipeline is, the more the filling amount of the CO2 refrigerant is. Because the CO2 refrigerant has high heat exchange efficiency, the ice surface coil pipe is optimized and calculated according to the ice field thermal load, the inner diameter of the ice surface heat exchange coil pipe of the CO2 refrigerant ice field can be obtained to be 10-14 mm, the heat exchange requirement can be met, and the reduction of the inner diameter of the ice surface heat exchange coil pipe of the CO2 refrigerant ice field reduces the CO2 filling amount.
2. As the ice surface of the ice rink is a single evaporator and the number of liquid supply branches is more than 150, and the number of the branches of the 1800m2 standard ice rink is more than 150, the problem of how to solve the problem of the uniformity of the refrigerant distribution of each branch of the ice surface heat exchange coil is very important. Based on this, the uniformity of distribution of the refrigerants of all branches of the maximum operation load in the daytime and the minimum maintenance load at night can be effectively achieved by arranging the liquid separating pore plate or the liquid separating short pipe on each branch, the circulation multiplying power of the CO2 refrigerant pump can be reduced, the circulation multiplying power of the CO2 pump is 1.2-1.5, and the consistency of no overheating and supply and return temperature of the refrigeration heat exchange coil of each branch is met. The specific design method comprises the following steps: the aperture that the resistance of the liquid separating pore plate or the liquid separating short pipe is equal to the resistance of the ice surface heat exchange coil is calculated according to the maximum operation load in the daytime and the flow of the CO2 pump circulation multiplying factor of 1.5, the CO2 pump operates at the working frequency in partial load, and the low-frequency operation is set for the minimum maintenance load at night so as to achieve the purpose of energy conservation. And considering factors such as the cleanliness of an actual engineering refrigeration system and the like, the minimum aperture of the liquid separating pore plate is not less than 3 mm.
3. Because the liquid-separating pore plate or the liquid-separating short pipe is adopted to solve the distribution uniformity of each branch refrigerant, the same-pass design of the liquid supply pipeline can be eliminated so as to reduce the filling amount of the CO2 refrigerant. The flow velocity of the liquid refrigerant of the liquid supply header CO2 can be designed according to 0.8-1.2 m/s, and the flow velocity of the gas-liquid two-phase of the gas return header CO2 can be designed according to 6-8 m/s.
4. Because the circulation multiplying power of the CO2 pump is 1.5, the corresponding pipe diameters of the CO2 liquid supply pipeline and the return air pipeline are reduced, and simultaneously, because the intrinsic dynamic viscosity of the CO2 refrigerant is low, the pipe diameters of the liquid supply pipeline and the return air pipeline can be designed according to the saturated pressure difference that the resistance is not more than 1 ℃ reduced evaporation temperature so as to reduce the refrigerant filling amount.
The embodiment of the application provides a refrigerant liquid amount control device of a carbon dioxide transcritical ice field refrigerating system.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an ice rink refrigeration apparatus according to an embodiment of the present disclosure, where the ice rink refrigeration apparatus may include:
the low-pressure circulating barrel state parameter acquiring module 1 is used for acquiring low-pressure circulating barrel state parameters when receiving a system starting instruction;
the compressor unit operation module 2 is used for controlling the compressor unit to enter an operation state when the state parameters of the low-pressure circulation barrel meet preset starting conditions;
the compressor unit operation parameter acquisition module 3 is used for acquiring the operation parameters of the heat insulation air cooler and the flash evaporator of the compressor unit in an operation state;
the primary throttling electronic expansion valve adjusting module 4 is used for adjusting the opening degree of the primary throttling electronic expansion valve according to the operation parameters of the heat insulation air cooler so as to enable the liquid level of carbon dioxide in the heat insulation air cooler to be zero;
and the secondary throttling electronic expansion valve adjusting module 5 is used for adjusting the opening degree of the secondary throttling electronic expansion valve according to the operating parameters of the flash evaporator so as to enable the carbon dioxide liquid level in the flash evaporator to reach a preset liquid level value.
It can be seen that, according to the refrigerant liquid amount control device of the carbon dioxide transcritical ice field refrigeration system provided in the embodiment of the present application, when a start instruction for starting the carbon dioxide transcritical ice field refrigeration system to perform ice field refrigeration is received, a low-pressure circulation barrel state parameter is obtained, and when the low-pressure circulation barrel state parameter meets a preset start condition, the compressor unit is controlled to enter an operating state, and in an operating process of the compressor unit, by obtaining the operating parameters of the compressor unit, including the operating parameters of the heat insulation air cooler and the operating parameters of the flash evaporator, the opening degree of the primary throttle electronic expansion valve and the opening degree of the secondary throttle electronic expansion valve are adjusted, so that the carbon dioxide liquid level in the heat insulation air cooler is zero, and the carbon dioxide liquid level in the flash evaporator reaches a preset liquid level value only meeting a flash evaporator liquid seal, thereby achieving the purpose of reducing the carbon dioxide refrigerant filling amount as much as possible, the safety risk is effectively reduced.
In an embodiment of the present application, the low pressure circulation barrel state parameter may include a low pressure circulation barrel refrigerant liquid level, and the compressor unit operation module 2 may be specifically configured to control the compressor unit to enter the operation state when the low pressure circulation barrel refrigerant liquid level reaches a sum of a preset minimum liquid level and a preset liquid level difference.
In an embodiment of the application, the refrigerant liquid amount control device of the carbon dioxide transcritical ice rink refrigeration system may further include a high liquid level alarm module, configured to obtain a refrigerant liquid level of the low-pressure circulation tank in real time in an operating state; and when the liquid level of the refrigerant in the low-pressure circulating barrel reaches the preset highest liquid level, outputting a high liquid level alarm signal.
In an embodiment of the present application, the refrigerant liquid amount control device of the carbon dioxide transcritical ice rink refrigeration system may further include a low-pressure circulation barrel pressure monitoring module, configured to obtain a low-pressure circulation barrel pressure value in real time in an operating state; when the pressure value of the low-pressure circulating barrel reaches a preset highest pressure value, controlling the compressor unit to stop running; and under the condition that the compressor unit stops running, if the pressure value of the low-pressure circulating barrel is lower than the difference value between the preset highest pressure value and the preset pressure return difference, controlling the compressor unit to restart.
In one embodiment of the present application, the adiabatic air cooler operating parameter may include an adiabatic air cooler outlet temperature, and the primary throttling electronic expansion valve adjustment module 4 may be specifically configured to determine a target value of the adiabatic air cooler outlet pressure based on the adiabatic air cooler outlet temperature; and adjusting the opening degree of the primary throttling electronic expansion valve so as to enable the outlet pressure of the heat insulation air cooler to reach a target value.
In an embodiment of the present application, the primary throttling electronic expansion valve adjusting module 4 may be further configured to, before the opening degree of the primary throttling electronic expansion valve is adjusted so that the outlet pressure of the insulating air cooler reaches the target value, adjust the primary throttling electronic expansion valve to close when the target value is lower than a preset minimum threshold value; when the target value reaches a preset highest threshold value, adjusting the opening degree of the primary throttling electronic expansion valve to the maximum opening degree; and when the target value is between the preset lowest threshold value and the preset highest threshold value, executing the step of adjusting the opening degree of the primary throttling electronic expansion valve so as to enable the outlet pressure of the heat insulation air cooler to reach the target value.
In an embodiment of the present application, the flash evaporator operation parameter may include a flash vapor liquid level set value, and the secondary throttling electronic expansion valve adjusting module 5 may be specifically configured to adjust the opening degree of the secondary throttling electronic expansion valve to an opening degree corresponding to the flash vapor liquid level set value according to a mapping relationship between the flash vapor liquid level and the opening degree of the secondary throttling electronic expansion valve.
For the introduction of the apparatus provided in the embodiment of the present application, please refer to the above method embodiment, which is not described herein again.
The embodiment of the application provides a carbon dioxide transcritical ice rink refrigerating system, which can comprise:
a memory for storing a computer program;
and the processor is used for realizing the steps of the refrigerant liquid amount control method of the carbon dioxide transcritical ice rink refrigerating system when executing the computer program.
For introduction of the system provided in the embodiment of the present application, please refer to the method embodiment described above, which is not described herein again.
Embodiments of the present application provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, may implement any of the steps of the method for controlling a refrigerant liquid amount in a carbon dioxide transcritical ice field refrigeration system as described above.
The computer-readable storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
For introduction of a computer-readable storage medium provided in the embodiments of the present application, please refer to the above method embodiments, which are not described herein again.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The technical solutions provided by the present application are described in detail above. The principles and embodiments of the present application are described herein using specific examples, which are only used to help understand the method and its core idea of the present application. It should be noted that, for those skilled in the art, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall into the protection scope of the present application.

Claims (10)

1. A method for controlling the amount of refrigerant liquid in a carbon dioxide transcritical ice rink refrigeration system is characterized by comprising the following steps:
when a system starting instruction is received, acquiring low-pressure circulating barrel state parameters;
when the state parameters of the low-pressure circulating barrel meet preset starting conditions, controlling the compressor unit to enter an operating state;
under the operating state, acquiring operating parameters of an adiabatic air cooler and operating parameters of a flash evaporator of the compressor unit;
adjusting the opening degree of a primary throttling electronic expansion valve according to the operation parameters of the heat-insulating air cooler so as to enable the liquid level of carbon dioxide in the heat-insulating air cooler to be zero;
and adjusting the opening degree of the secondary throttling electronic expansion valve according to the operating parameters of the flash evaporator so as to enable the carbon dioxide liquid level in the flash evaporator to reach a preset level value.
2. The method for controlling the refrigerant liquid amount of the carbon dioxide transcritical ice rink refrigeration system according to claim 1, wherein the low-pressure circulation barrel state parameter includes a low-pressure circulation barrel refrigerant liquid level, and when the low-pressure circulation barrel state parameter satisfies a preset starting condition, the method for controlling the compressor unit to enter the running state includes:
and when the liquid level of the refrigerant in the low-pressure circulating barrel reaches the sum of the preset minimum liquid level and the preset liquid level return difference, controlling the compressor unit to enter an operating state.
3. The method for controlling the amount of refrigerant liquid in a carbon dioxide transcritical ice field refrigeration system according to claim 2, further comprising:
under the running state, acquiring the liquid level of the refrigerant of the low-pressure circulating barrel in real time;
and when the liquid level of the refrigerant in the low-pressure circulating barrel reaches the preset highest liquid level, outputting a high liquid level alarm signal.
4. The method for controlling the amount of refrigerant liquid in a carbon dioxide transcritical ice field refrigeration system according to claim 3, further comprising:
under the running state, acquiring the pressure value of the low-pressure circulating barrel in real time;
when the pressure value of the low-pressure circulating barrel reaches a preset highest pressure value, controlling the compressor unit to stop running;
and under the condition that the compressor unit stops running, if the pressure value of the low-pressure circulating barrel is lower than the difference value between the preset highest pressure value and the preset pressure return difference, controlling the compressor unit to restart.
5. The method for controlling the amount of refrigerant liquid in a carbon dioxide transcritical ice rink refrigeration system according to claim 1, wherein the adiabatic air cooler operation parameters include an adiabatic air cooler outlet temperature, and the adjusting the opening degree of the primary throttling electronic expansion valve according to the adiabatic air cooler operation parameters to make the carbon dioxide liquid level in the adiabatic air cooler zero comprises:
determining a target value of an outlet pressure of the heat-insulating air cooler according to the outlet temperature of the heat-insulating air cooler;
and adjusting the opening degree of the primary throttling electronic expansion valve so as to enable the outlet pressure of the heat insulation air cooler to reach the target value.
6. The method for controlling the amount of refrigerant liquid in a carbon dioxide transcritical ice rink refrigeration system according to claim 5, wherein before the adjusting the opening degree of the primary throttling electronic expansion valve to make the outlet pressure of the heat-insulating air cooler reach the target value, the method further comprises:
when the target value is lower than a preset lowest threshold value, regulating the primary throttling electronic expansion valve to be closed;
when the target value reaches a preset highest threshold value, adjusting the opening degree of the primary throttling electronic expansion valve to the maximum opening degree;
and when the target value is between the preset lowest threshold value and the preset highest threshold value, performing the step of adjusting the opening degree of the primary throttling electronic expansion valve so that the outlet pressure of the heat-insulating air cooler reaches the target value.
7. The method for controlling the amount of refrigerant liquid in a carbon dioxide transcritical ice rink refrigeration system according to claim 1, wherein the operating parameters of the flash evaporator comprise a set flash vapor liquid level value, and the method for adjusting the opening degree of the secondary throttling electronic expansion valve according to the operating parameters of the flash evaporator to make the carbon dioxide liquid level in the flash evaporator reach a liquid seal comprises the following steps:
and adjusting the opening degree of the secondary throttling electronic expansion valve to the opening degree corresponding to the set value of the flash gas liquid level according to the mapping relation between the flash gas liquid level and the opening degree of the secondary throttling electronic expansion valve.
8. A refrigerant liquid amount control device of a carbon dioxide transcritical ice rink refrigerating system is characterized by comprising:
the low-pressure circulating barrel state parameter acquiring module is used for acquiring low-pressure circulating barrel state parameters when a system starting instruction is received;
the compressor unit operation module is used for controlling the compressor unit to enter an operation state when the state parameters of the low-pressure circulation barrel meet preset starting conditions;
the compressor unit operation parameter acquisition module is used for acquiring the operation parameters of the heat insulation air cooler and the flash evaporator of the compressor unit in the operation state;
the primary throttling electronic expansion valve adjusting module is used for adjusting the opening degree of the primary throttling electronic expansion valve according to the operation parameters of the heat insulation air cooler so as to enable the carbon dioxide liquid level in the heat insulation air cooler to be higher than the set carbon dioxide liquid level;
and the secondary throttling electronic expansion valve adjusting module is used for adjusting the opening degree of the secondary throttling electronic expansion valve according to the operating parameters of the flash evaporator so as to enable the carbon dioxide liquid level in the flash evaporator to reach a preset liquid level value.
9. A carbon dioxide transcritical ice rink refrigeration system, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method for controlling the amount of refrigerant liquid in a carbon dioxide transcritical ice rink refrigeration system according to any one of claims 1 to 7 when executing said computer program.
10. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the method for controlling the amount of refrigerant liquid of a carbon dioxide transcritical icebox refrigeration system according to any one of claims 1 to 7.
CN202210389263.0A 2022-04-13 2022-04-13 Method and equipment for controlling refrigerant liquid amount of carbon dioxide transcritical ice rink refrigerating system Active CN115060028B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002022288A (en) * 2000-07-13 2002-01-23 Zexel Valeo Climate Control Corp Controller for refrigeration cycle
US20030213256A1 (en) * 2002-04-04 2003-11-20 Mitsuo Ueda Refrigeration cycle apparatus
US20120055182A1 (en) * 2008-10-23 2012-03-08 Dube Serge Co2 refrigeration system
CN110160301A (en) * 2019-05-29 2019-08-23 天津大学 A kind of artificial ice stadium system of carbon dioxide refrigeration working medium
CN111503915A (en) * 2020-05-08 2020-08-07 北京国家速滑馆经营有限责任公司 Carbon dioxide refrigerating system for ice rink

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002022288A (en) * 2000-07-13 2002-01-23 Zexel Valeo Climate Control Corp Controller for refrigeration cycle
US20030213256A1 (en) * 2002-04-04 2003-11-20 Mitsuo Ueda Refrigeration cycle apparatus
US20120055182A1 (en) * 2008-10-23 2012-03-08 Dube Serge Co2 refrigeration system
CN110160301A (en) * 2019-05-29 2019-08-23 天津大学 A kind of artificial ice stadium system of carbon dioxide refrigeration working medium
CN111503915A (en) * 2020-05-08 2020-08-07 北京国家速滑馆经营有限责任公司 Carbon dioxide refrigerating system for ice rink

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