CN115060028B - 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
CN115060028B
CN115060028B CN202210389263.0A CN202210389263A CN115060028B CN 115060028 B CN115060028 B CN 115060028B CN 202210389263 A CN202210389263 A CN 202210389263A CN 115060028 B CN115060028 B CN 115060028B
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carbon dioxide
liquid level
pressure
air cooler
low
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CN115060028A (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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Production, Working, Storing, Or Distribution Of Ice (AREA)

Abstract

The application discloses a method and a device for controlling the refrigerant liquid amount of a carbon dioxide transcritical ice rink refrigerating system, the carbon dioxide transcritical ice rink refrigerating system and a computer readable storage medium, wherein the method comprises the following steps: when a system starting instruction is received, acquiring a state parameter of the low-pressure circulation barrel; 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 operation state, acquiring the operation parameters of the adiabatic air cooler and the operation parameters of the flash evaporator of the compressor unit; 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 liquid level of carbon dioxide in the heat-insulating air cooler to be zero; and adjusting the opening degree of the secondary throttling valve according to the operation 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. By applying the technical scheme provided by the application, the safety problem caused by taking carbon dioxide as a refrigerant in the ice rink refrigerating system can be effectively solved.

Description

Method and equipment for controlling refrigerant liquid amount of carbon dioxide transcritical ice rink refrigerating system
Technical Field
The present application relates to the field of refrigeration technologies, and in particular, to a method and an apparatus for controlling the amount of refrigerant in a carbon dioxide transcritical ice rink refrigeration system, and a computer readable storage medium.
Background
With the rising demands of society and masses on living standards, ice and snow sports are favored by more and more people, and the construction of intelligent artificial ice rinks is important for promoting the development of ice sports. Carbon dioxide is a natural working medium, so that carbon dioxide is used as a refrigerant to realize ice rink refrigeration, and the ice rink refrigeration system is more friendly to the environment and environment-friendly. However, carbon dioxide critical temperature is 31.1 ℃ lower, and there is a greater safety risk relative to other refrigerants at higher pressures.
Therefore, how to solve the safety problem caused by taking carbon dioxide as a refrigerant in a ice rink refrigeration system to effectively reduce the safety risk is a problem to be solved by those skilled in the art.
Disclosure of Invention
The application aims to provide a method for controlling the refrigerant liquid amount of a carbon dioxide transcritical ice rink refrigerating system, which can effectively solve the safety problem caused by taking carbon dioxide as a refrigerant in the ice rink refrigerating system; another object of the present application is to provide a refrigerant liquid amount control device for a carbon dioxide transcritical ice rink refrigeration system, and a computer readable storage medium, which all have the above-mentioned 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 a state parameter of the low-pressure circulation barrel;
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 operation parameters of the adiabatic air cooler and the operation parameters of the flash evaporator of the compressor unit in the operation state;
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 valve according to the operation 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 tank state parameter includes a low-pressure circulation tank refrigerant level, and when the low-pressure circulation tank state parameter meets a preset starting condition, controlling the compressor unit to enter an operation state, including:
and when the refrigerant liquid level of 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 refrigerant liquid amount of the carbon dioxide transcritical ice rink refrigerating system further comprises:
acquiring the refrigerant liquid level of the low-pressure circulation barrel in real time in the running state;
and outputting a high liquid level alarm signal when the liquid level of the low-pressure circulating barrel refrigerant reaches a preset maximum liquid level.
Optionally, the method for controlling the refrigerant liquid amount of the carbon dioxide transcritical ice rink refrigerating 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 adiabatic air cooler operation parameter includes 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 parameter so as to make the carbon dioxide liquid level in the adiabatic air cooler be zero includes:
determining a target value of the outlet pressure of the adiabatic air cooler according to the outlet temperature of the adiabatic air cooler;
And adjusting the opening degree of the primary throttling electronic expansion valve so as to enable the outlet pressure of the adiabatic air cooler to reach the target value.
Optionally, before the opening degree of the primary throttling electronic expansion valve is adjusted to make the outlet pressure of the adiabatic air cooler reach the target value, the method further includes:
when the target value is lower than a preset minimum threshold value, the primary throttling electronic expansion valve is regulated 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 adiabatic air cooler to reach the target value.
Optionally, the flash evaporator operation parameter includes a flash vapor liquid level set point, and the adjusting the opening degree of the secondary throttling valve according to the flash evaporator operation parameter to enable the carbon dioxide liquid level in the flash evaporator to reach a liquid seal includes:
and adjusting the opening degree of the secondary throttling electronic expansion valve to the opening degree corresponding to the flash gas liquid level set value 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 rink refrigeration system, comprising:
the low-pressure circulation barrel state parameter acquisition module is used for acquiring the state parameters of the low-pressure circulation barrel 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 circulating barrel meet preset starting conditions;
the compressor unit operation parameter acquisition module is used for acquiring the operation parameters of the adiabatic air cooler and the operation parameters of 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-insulating air cooler so as to enable the liquid level of carbon dioxide in the heat-insulating air cooler to be zero;
and the secondary throttling valve adjusting module is used for adjusting the opening degree of the secondary throttling valve according to the operation 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 methods for controlling the amount of refrigerant liquid of a carbon dioxide transcritical ice rink refrigeration system as described above 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, performs the steps of any of the methods for controlling the refrigerant liquid level of a carbon dioxide transcritical ice rink refrigeration system as described above.
The application provides a method for controlling the refrigerant liquid amount of a carbon dioxide transcritical ice rink refrigerating system, which comprises the steps of obtaining state parameters of a low-pressure circulation barrel 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; acquiring the operation parameters of the adiabatic air cooler and the operation parameters of the flash evaporator of the compressor unit in the operation state; 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 valve according to the operation 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. By applying the technical scheme provided by the application, when a starting instruction for starting a carbon dioxide transcritical ice rink refrigerating system to refrigerate an ice rink is received, the state parameter of the low-pressure circulation barrel is obtained, and when the state parameter of the low-pressure circulation barrel meets the preset starting condition, the compressor unit is controlled to enter the running state, and 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 regulated, the carbon dioxide liquid level in the heat-insulating air cooler is zero, and the carbon dioxide liquid level in flash steam only meets the preset liquid level value of the flash evaporation gas-liquid seal, thereby achieving the aim of reducing the filling amount of the carbon dioxide refrigerant as much as possible, and effectively reducing the safety risk.
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 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 application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the technical solutions in the prior art and the embodiments of the present application, the following will briefly describe the drawings that need to be used in the description of the prior art and the embodiments of the present application. Of course, the following drawings related to embodiments of the present application are only a part of 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 inventive effort, and the obtained other drawings also fall within the scope of the present application.
Fig. 1 is a schematic flow chart of a method for controlling the amount of refrigerant in a carbon dioxide transcritical ice rink refrigeration system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a refrigerant liquid amount control device of a carbon dioxide transcritical ice rink refrigeration system according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The method for controlling the refrigerant liquid amount of the carbon dioxide transcritical ice rink refrigerating system provided by the application can be realized by the carbon dioxide transcritical ice rink refrigerating system, the carbon dioxide transcritical ice rink refrigerating system can comprise a carbon dioxide refrigerant pump, an ice rink heat exchange coil, a low-pressure circulation barrel and a compressor unit (such as a parallel compressor unit, a bipolar compressor unit and the like), the carbon dioxide refrigerant pump, the ice rink heat exchange coil and the compressor unit are all connected with the low-pressure circulation barrel, and the carbon dioxide refrigerant pump is connected with the ice rink heat exchange coil, so that ice rink refrigeration can be realized based on the ice rink refrigerating equipment.
The carbon dioxide refrigerating pump and the ice rink refrigerating process are started and stopped simultaneously, namely, when the carbon dioxide refrigerating pump is started, the carbon dioxide transcritical ice rink refrigerating system starts to operate for rink refrigerating, and when the carbon dioxide refrigerating pump stops, the carbon dioxide transcritical ice rink refrigerating system stops operating to finish rink refrigerating.
The implementation flow of ice rink refrigeration based on the carbon dioxide transcritical ice rink refrigeration system is as follows: firstly, after a carbon dioxide refrigerant pump is started, power is provided for conveying liquid carbon dioxide, and the liquid carbon dioxide stored in a low-pressure circulation barrel is conveyed to a heat exchange coil of a ice rink; secondly, the ice rink heat exchange coil is used for realizing ice rink refrigeration, so that after the ice rink heat exchange coil receives liquid carbon dioxide conveyed by the carbon dioxide refrigerant pump, heat exchange can be started to realize ice rink refrigeration, and meanwhile, in the ice rink refrigeration process, the liquid carbon dioxide is converted into gas-liquid mixed carbon dioxide; further, the cold field heat exchange coil conveys the gas-liquid mixed carbon dioxide back to the low-pressure circulation barrel, the low-pressure circulation barrel has a gas-liquid separation function, and can carry out 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 cold field heat exchange coil and is used for continuously conveying the liquid carbon dioxide to the cold field heat exchange coil to realize cold field refrigeration, and the gaseous carbon dioxide is conveyed to the compressor unit for treatment; and finally, compressing the gaseous carbon dioxide into liquid carbon dioxide by the compressor unit, and transmitting the liquid carbon dioxide back to the low-pressure circulation barrel for continuously conveying the liquid carbon dioxide to the heat exchange coil of the ice rink to realize refrigeration of the ice rink. Thus, the circulation of carbon dioxide in the refrigeration process of the ice rink is completed, and the refrigeration of the ice rink 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 adiabatic air cooler, wherein the first heat regenerator, the second heat regenerator and the adiabatic air cooler are all connected with 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 adiabatic air cooler; the compressor unit is connected with the low-pressure circulation 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 realization flow of compressing gaseous carbon dioxide into liquid carbon dioxide based on the compressor unit comprises the following steps: firstly, gaseous carbon dioxide separated by a low-pressure circulation barrel is conveyed to a first heat regenerator, the gaseous carbon dioxide and medium-pressure liquid carbon dioxide conveyed by a flash evaporator are subjected to heat exchange by the first heat regenerator, and the overheated low-temperature low-pressure gaseous carbon dioxide after heat exchange is conveyed to a first compressor for compression. The flash evaporator is used for realizing gas-liquid separation, so that the medium-pressure liquid carbon dioxide obtained through gas-liquid separation is conveyed to the first heat regenerator, meanwhile, 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 conveyed to the second compressor for compression after heat exchange by the second heat regenerator. 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 an adiabatic air cooler for cooling. And finally, conveying the carbon dioxide cooled by the heat-insulating gas cooler to a flash evaporator for gas-liquid separation, heating the separated gaseous carbon dioxide by a second heat regenerator, then entering a second compressor for air suction, and supercooling the separated liquid carbon dioxide by a first heat regenerator and then entering a low-pressure circulation barrel. Thus, the realization flow of compressing gaseous carbon dioxide based on the compressor unit is completed.
The secondary throttling electronic expansion valve is arranged on a connecting pipeline between the first heat regenerator and the low-pressure circulation barrel, and the primary throttling electronic expansion valve is arranged on a connecting pipeline between the second heat regenerator and the flash evaporator. Thus, the liquid amount control of the carbon dioxide refrigerant can be realized by controlling the opening degree of the throttling electronic expansion valve.
Based on the carbon dioxide transcritical ice rink refrigerating system, the embodiment of the application provides a method for controlling the refrigerant liquid amount of the carbon dioxide transcritical ice rink refrigerating system.
Referring to fig. 1, fig. 1 is a flow chart of a method for controlling the refrigerant liquid amount of a carbon dioxide transcritical ice rink refrigeration system according to an embodiment of the present application, where the method for controlling the refrigerant liquid amount of the carbon dioxide transcritical ice rink refrigeration system may include the following steps S101 to S105.
S101: when a system starting instruction is received, acquiring a state parameter of the low-pressure circulation barrel;
the step aims at acquiring the state parameters of the low-pressure circulation barrel based on the received system starting instruction. The system starting instruction refers to an instruction for starting a carbon dioxide transcritical ice rink refrigerating system to refrigerate an ice rink, and after receiving the instruction, the system starting instruction can acquire the operating parameters of the low-pressure circulation barrel, and the process can be realized through corresponding sensor equipment. The state parameter of the low-pressure circulation barrel is used for realizing the judgment of the starting condition, namely judging whether the preset condition for starting the carbon dioxide transcritical ice rink refrigerating system is met or not, the specific content of the low-pressure circulation barrel is set by a technician according to the actual requirement, and the low-pressure circulation barrel is not limited in this aspect, and can comprise data information such as the carbon dioxide liquid level, the pressure and the like of the low-pressure circulation barrel.
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 enable the start-up of the carbon dioxide transcritical ice rink refrigeration system to bring the compressor train into operation. Specifically, the low-pressure circulation barrel state parameter can be obtained in real time, and when the low-pressure circulation barrel state parameter is monitored to meet the preset starting condition, the carbon dioxide transcritical ice rink refrigerating system can be started, and after the carbon dioxide transcritical ice rink refrigerating system is started, the compressor unit also enters the running state. The preset starting condition is a condition that can start the carbon dioxide transcritical ice rink refrigerating system, and is set by a technician according to practical situations, and the application is not limited to this, for example, the preset starting condition can be set to be that the pressure of the low-pressure circulation tank reaches the preset pressure, or the liquid level of the low-pressure circulation tank reaches the preset liquid level, etc.
S103: acquiring the operation parameters of the adiabatic air cooler and the operation parameters of the flash evaporator of the compressor unit in the operation state;
the step aims at obtaining the operation parameters of the compressor unit in the operation state, including the operation parameters of the adiabatic air cooler and the operation parameters of the flash evaporator, so as to realize the liquid quantity control of the carbon dioxide refrigerant according to the parameters. The specific contents of the operation parameters of the adiabatic gas cooler and the operation parameters of the flash evaporator can be set by technicians according to actual conditions, the application is not limited to the specific contents, and the control of the liquid amount of the carbon dioxide refrigerant can be realized, for example, the operation parameters can comprise data information such as the outlet temperature and the outlet pressure of the adiabatic gas cooler, the outlet temperature and the outlet pressure of the flash gas, 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 valve according to the operation 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.
The method aims at adjusting the opening degree of the throttling 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 adiabatic air cooler, and the adjustment target is that the carbon dioxide liquid level in the adiabatic air cooler is zero; and adjusting the opening degree of the secondary throttling valve according to the operation parameters of the flash evaporator, wherein the adjustment target is that the carbon dioxide liquid level in the flash evaporator reaches a preset liquid level value, and the preset liquid level value is a liquid level value which only meets the liquid seal of the flash evaporator. That is, by adjusting the opening degree of the throttling electronic expansion valve, no liquid or little liquid is stored in the heat-insulating air cooler and the flash evaporator, thereby achieving the purpose of effectively reducing the filling amount of the carbon dioxide refrigerant and further reducing the safety risk.
Therefore, according to the ice rink refrigeration method provided by the embodiment of the application, when the start instruction for starting the carbon dioxide transcritical ice rink refrigeration system to perform ice rink refrigeration is received, the state parameter of the low-pressure circulation barrel is obtained, and when the state parameter of the low-pressure circulation barrel meets the preset start condition, the compressor unit is controlled to enter the operation state, and in the operation process of the compressor unit, the operation parameters of the compressor unit, including the operation parameters of the adiabatic air cooler and the operation parameters of the flash evaporator, are obtained, so that the adjustment of the opening degree of the primary throttling electronic expansion valve and the opening degree of the secondary throttling electronic expansion valve is realized, the carbon dioxide liquid level in the adiabatic air cooler is zero, the carbon dioxide liquid level in the flash steam reaches the preset liquid level value which only meets the flash evaporation gas-liquid seal, the aim of reducing the filling amount of the carbon dioxide refrigerant as much as possible is achieved, and the safety risk is effectively reduced.
Based on the above embodiments:
in one embodiment of the present application, the low pressure circulation tank status parameter may include a low pressure circulation tank refrigerant level, and controlling the compressor unit to enter the operation state when the low pressure circulation tank status parameter meets a preset starting condition may include: and when the refrigerant liquid level of 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.
The embodiment of the application provides a system starting condition judging method, and particularly, a low-pressure circulation barrel state parameter can comprise the refrigerant liquid level of a low-pressure circulation barrel, so that when the refrigerant liquid level of the low-pressure circulation barrel reaches the sum of a preset minimum liquid level and a preset liquid level return difference, the current state can be judged to meet the system starting condition, and at the moment, a carbon dioxide transcritical ice rink refrigerating system can be started to enable a compressor unit to enter an operating state. Otherwise, if the refrigerant liquid level of the low-pressure circulation barrel does not reach the sum of the preset minimum liquid level and the preset liquid level return difference, the current state can be judged to not meet the starting condition, at the moment, a 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 simultaneously started and stopped, so that the preset minimum liquid level is the minimum liquid level for allowing the carbon dioxide refrigerant pump to be started, the preset liquid level return difference is the pump-on liquid level return difference, and specific values of the carbon dioxide refrigerant pump and the ice rink refrigeration process can be set by a technician according to actual conditions, and the application is not limited to this.
In one embodiment of the present application, the method for controlling the amount of refrigerant liquid in the carbon dioxide transcritical ice rink refrigeration system may further include: under the running state, acquiring the refrigerant liquid level of the low-pressure circulating barrel in real time; and when the refrigerant liquid level of the low-pressure circulating barrel reaches the preset maximum liquid level, outputting a high liquid level alarm signal.
It can be appreciated that when the refrigerant liquid level of the low-pressure circulation tank is too high, certain safety risk is necessarily brought, so that the highest alarm liquid level can be preset, namely the preset highest liquid level, the refrigerant liquid level of the low-pressure circulation tank can be monitored in real time under the running state of the compressor unit, namely in the refrigeration process of the ice rink, and compared with the preset highest liquid level, once the refrigerant liquid level of the low-pressure circulation tank is monitored to reach the preset highest liquid level, a high liquid level alarm signal can be immediately output, and a technician is timely informed that the refrigerant liquid level of the current low-pressure circulation tank is too high, the safety risk exists, and the technical personnel can take protective measures in time conveniently. Similarly, the specific value of the preset maximum liquid level is set by the technician according to the actual situation, which is not limited by the present application.
In one embodiment of the present application, the method for controlling the amount of refrigerant liquid in the carbon dioxide transcritical ice rink 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; 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, the compressor unit is controlled to restart.
In order to effectively ensure the safe operation of the carbon dioxide transcritical ice rink refrigerating system, the pressure value of the low-pressure circulating barrel can be monitored in real time, so that the start-stop control of the compressor unit is carried out 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 a preset highest pressure value, the compressor unit can be controlled to stop running, and of course, the compressor unit is controlled to stop running, particularly the carbon dioxide refrigerant pump is controlled to stop running; further, under the condition that the compressor unit stops running, 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 compressor unit is controlled to restart, in particular to control the carbon dioxide refrigerant pump to restart.
Similar to the above-mentioned preset minimum liquid level and preset liquid level return difference, the specific values of the preset maximum pressure value and the preset liquid level return difference can be set by the skilled person according to the actual situation, which is not limited in the present application.
Of course, the above monitoring of the low pressure circulation tank level and the low pressure circulation tank pressure is only one implementation manner provided by the present application, and other parameters (such as the current signal of the carbon dioxide refrigerant pump) may be monitored according to actual situations, so as to ensure the safe operation of the carbon dioxide transcritical ice rink refrigeration system,
In one embodiment of the present application, the adiabatic air cooler operation parameter may include an adiabatic air cooler outlet temperature, and adjusting the opening degree of the primary throttling electronic expansion valve according to the adiabatic air cooler operation parameter so as to make the carbon dioxide liquid level in the adiabatic air cooler zero may include: determining a target value of the adiabatic air cooler outlet pressure according to the adiabatic air cooler outlet temperature; the opening degree of the primary throttling electronic expansion valve is regulated so as to enable the outlet pressure of the adiabatic air cooler to reach a target value.
The embodiment of the application provides a realization method for adjusting the opening degree of a primary throttling electronic expansion valve based on an adiabatic air cooler operation parameter, wherein the adiabatic air cooler operation parameter can comprise the outlet temperature of the adiabatic air cooler, so that the opening degree of the primary throttling electronic expansion valve can be adjusted according to the outlet temperature of the adiabatic air cooler, and the outlet temperature of the adiabatic air cooler can be acquired through a temperature sensor. In the implementation process, after the acquisition of the outlet temperature of the adiabatic air cooler, a target value of the outlet pressure of the adiabatic air cooler (which can be implemented based on a pre-established calculation rule) can be calculated according to the outlet temperature of the adiabatic air cooler, wherein the target value of the outlet pressure of the adiabatic air cooler is the outlet pressure value of the adiabatic air cooler, so that the outlet pressure of the adiabatic air cooler can reach the target value by adjusting the opening degree of the primary throttling electronic expansion valve, and then no liquid exists in the adiabatic air cooler in the running state.
In an embodiment of the present application, before the 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 minimum threshold value, the primary throttling electronic expansion valve is regulated 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; when the target value is between the preset minimum threshold value and the preset maximum threshold value, the step of adjusting the opening degree of the one-time throttling electronic expansion valve so that the outlet pressure of the adiabatic air cooler reaches the target value is performed.
In order to ensure safe operation of the ice rink refrigeration system of the compressor unit, after a target value of the outlet pressure of the adiabatic air cooler is obtained through calculation, the target value can be subjected to threshold comparison, and the opening degree of the throttle electronic expansion valve is adjusted once according to a 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 minimum threshold value, the one-time 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 one-time throttling electronic expansion valve can be directly controlled to reach 100%, namely the maximum opening degree; if the target value is between the preset minimum threshold value and the preset maximum threshold value, the step of adjusting the opening degree of the one-time throttling electronic expansion valve is further executed so as to enable the outlet pressure of the adiabatic air cooler to reach 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 can be set by a technician according to actual conditions.
In one embodiment of the present application, the flash evaporator operation parameter may include a flash gas level set value, and adjusting the opening degree of the secondary throttling valve according to the flash evaporator operation parameter so that the carbon dioxide level in the flash evaporator reaches a preset level value may include: and according to the mapping relation between the flash gas liquid level and the opening degree of the secondary throttling electronic expansion valve, adjusting the opening degree of the secondary throttling electronic expansion valve to the opening degree corresponding to the flash gas liquid level set value.
The embodiment of the application provides a realization method for adjusting the opening degree of a secondary throttling electronic expansion valve based on a flash evaporator operation parameter, wherein the flash evaporator operation parameter can comprise a flash evaporator liquid level set value, so that the opening degree of the secondary throttling electronic expansion valve can be adjusted according to the flash evaporator liquid level set value, and the flash evaporator liquid level set value is a liquid level value preset by a technician according to actual ice making requirements and capable of meeting the liquid seal of a flash evaporator. In the implementation process, a mapping relation between the flash gas liquid level and the opening degree of the secondary throttling electronic expansion valve can be created in advance, and in general, the higher the flash gas liquid level is, the larger the opening degree of the secondary throttling electronic expansion valve is; further, after the flash evaporator liquid level set value is determined, the opening degree of the secondary throttling electronic expansion valve can be adjusted to the opening degree corresponding to the flash evaporation gas liquid level set value, so that in the running state, little liquid is stored in the flash evaporation gas and only the liquid seal is met.
On the basis of the above embodiments, the embodiment of the application provides another method for controlling the liquid amount of carbon dioxide refrigerant in a compressor unit.
In the embodiment of the application, aiming at a carbon dioxide transcritical ice rink refrigerating system, the adopted technical scheme comprises the following steps of: the control strategy of the primary throttling electronic expansion valve is utilized to ensure that the high-pressure part does not store liquid, namely the heat-insulating air cooler does not store liquid; the secondary throttling valve 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 only needs to meet the liquid seal; the control logic strategy of the CO2 refrigerant pump is utilized to enable the low-pressure part to wave and store liquid, namely, the liquid level of the low-pressure circulating barrel which can continuously operate by the CO2 refrigerant pump only needs to be met when the ice rink is in high-load operation in the daytime and the ice rink is in maintenance load at night during CO2 filling.
The specific implementation flow of each control strategy comprises the following steps:
1. control logic of the primary throttling electronic expansion valve for ice making working conditions: based on the control of the outlet temperature t5 of the adiabatic air cooler and the outlet pressure P5 of the adiabatic air cooler, the implementation process may include:
(1) The minimum allowable adiabatic air cooler outlet pressure value is set to 40bar, and the primary throttling electronic expansion valve is closed when P5 is less than 40 bar.
(2) The maximum allowable adiabatic air cooler outlet pressure value is set to 92bar, and when P5.gtoreq.92 bar, the opening degree of the primary throttling electronic expansion valve is 100 percent.
(3) When the outlet temperature t5 of the adiabatic air cooler is less than 26 ℃, the control is carried out according to the supercooling degree set value, and the CO2 saturated pressure value P5=4×10 (-5) × (t5+tl)/(3+0.0092× (t5+tl)/(2+0.9259× (t5+tl) +33.821) corresponding to the outlet pressure value t5 of the adiabatic air cooler and the supercooling degree set value tl is subjected to PI proportional integral control.
(4) When the outlet temperature of the air cooler is 26-t 5-31 ℃, linear interpolation is performed according to a transition region, and PI proportional integral control is performed according to the CO2 saturation pressure value P5=4×10 (-5) × (26+tl)/(2+0.9259× (26+tl) +33.821) corresponding to the pressure value of 26+the supercooling degree set value at 26 ℃ and the pressure value of 74bar corresponding to 31 ℃.
(5) When the outlet temperature t5 of the air cooler is more than 31 ℃, the air cooler is controlled according to the optimal exhaust pressure, to is the saturated temperature corresponding to the high-pressure level suction set value, and PI proportional integral control P5 is carried out on the calculated value of P5=9.8× (2.778-0.0157×to) ×t5+ (0.381×to-9.34) -1.
2. Control logic of the secondary throttle valve 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 implementation flow comprises:
(1) The larger the liquid level L1 of the flash evaporator liquid level sensor is, the larger the opening degree of the secondary throttling electronic expansion valve is, and otherwise, the opening degree of the secondary throttling electronic expansion valve is smaller.
(2) The liquid level of the flash evaporator only needs to meet the requirement that the flash evaporator forms a liquid seal so as to reduce the CO2 filling amount 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 circulation barrel, and the realization flow comprises the following steps:
(1) The CO2 refrigerant pump and the ice making unit are started and stopped simultaneously.
(2) Setting the minimum liquid level Ld of the CO2 pump which is allowed to be started and the pump-on liquid level return difference L, wherein when the CO2 pump obtains a starting signal but L2 is smaller than Ld, the CO2 pump is not started; when the CO2 pump receives the on signal but L2+.Ld+L, the CO2 pump is turned on.
(3) And collecting a CO2 current signal, setting a minimum current allowed by CO2, stopping the CO2 pump when the current of the CO2 pump in operation is lower than a set value of the minimum current allowed by CO2, and delaying the 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 more than or equal to the highest allowable pressure value of the low-pressure circulating barrel, and providing a CO2 opening signal after time delay when the actual pressure value of the low-pressure circulating barrel is less than the highest allowable pressure value-return difference value of the low-pressure circulating barrel.
(5) The CO2 refrigerant pump operates in a variable frequency mode, and the low-frequency operation of the night ice-protecting mode can be set according to time.
(6) When the liquid level L2 of the low-pressure circulating barrel reaches a high liquid level setting value, a high liquid level alarm signal is sent out.
Therefore, based on the control logic, the aim 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 accurate design to low pressure part pipe-line system, mainly include low pressure circulation bucket to ice face liquid supply pipeline, liquid supply collector, ice face heat exchange coil, return air collector and return air pipeline etc. corresponding design content specifically can be:
1. according to the technical characteristics of the ice field, the temperature of the ice surface 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 all branches supply the same temperature. The adoption of the CO2 pump for supplying liquid is a better solution, but the CO2 pump for supplying liquid can bring about the increase of the filling quantity of CO2 refrigerant, and of course, the larger the circulation multiplying power of the CO2 pump for supplying liquid is, the better the distribution uniformity of the refrigerants of all branches of the ice surface heat exchange coil is, the more the quantity of CO2 liquid which is not subjected to heat exchange and evaporation by the refrigeration heat exchange coils of all branches is, the more the supply temperature of the refrigeration heat exchange coils of all branches is consistent, and the larger the pipe diameter of a pipeline of a corresponding low-pressure part is, so that the filling quantity of the CO2 refrigerant is more. Because the CO2 refrigerant has high heat exchange efficiency, the ice surface coil is optimally calculated according to the heat load of the ice rink, the inner diameter of the ice surface heat exchange coil of the ice rink of the CO2 refrigerant can 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 of the ice rink of the CO2 refrigerant reduces the CO2 filling amount.
2. Because the ice surface of the ice rink is a single evaporator and the liquid supply branches are more, the number of 1800m2 standard ice rink branches is more than 150, so that the uniformity of the refrigerant distribution of each branch of the ice surface heat exchange coil is very important. Based on the method, the uniformity of the distribution of the refrigerating agents of each branch can be effectively achieved by arranging the liquid dividing pore plate or the liquid dividing short pipe on each branch, the maximum operation load in the daytime and the minimum maintenance load in the evening, the circulation multiplying power of a CO2 refrigerating agent pump can be reduced, the circulation multiplying power of the CO2 pump is 1.2-1.5, and the consistency of no overheat and no return temperature of the refrigerating heat exchange coils of each branch is met. The specific design method comprises the following steps: and calculating the aperture of the liquid separation pore plate or the liquid separation short pipe with the resistance equal to the resistance of the ice heat exchange coil according to the maximum operation load in the daytime and the flow of the circulation multiplying power of the CO2 pump of 1.5, operating the CO2 pump at the working frequency in partial load, and setting low-frequency operation to achieve the aim of saving energy at the minimum maintenance load at night. And considering factors such as the cleanliness of an actual engineering refrigerating system, and the minimum aperture of the liquid separation pore plate is not smaller than 3mm.
3. Because the liquid-dividing pore plate or the liquid-dividing short pipe is adopted to solve the uniformity of the distribution of the refrigerants of each branch, the same-pass design of a liquid supply pipeline can be canceled, so that the filling quantity of the CO2 refrigerant is reduced. The flow rate of the liquid supply header CO2 liquid refrigerant can be designed to be 0.8-1.2 m/s, and the flow rate of the gas-liquid two-phase of the return header CO2 can be designed to be 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 air return pipeline are reduced, and meanwhile, because the characteristic dynamic viscosity of the CO2 refrigerant is small, the pipe diameters of the liquid supply pipeline and the air return pipeline can be designed according to the saturated pressure difference corresponding to the evaporation temperature of the liquid supply pipeline and the air return pipeline, the resistance of which is not more than 1 ℃ is reduced, so that the refrigerant filling quantity is reduced.
The embodiment of the application provides a refrigerant liquid quantity control device of a carbon dioxide transcritical ice rink refrigerating system.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a ice rink refrigeration device according to an embodiment of the present application, where the ice rink refrigeration device may include:
the low-pressure circulation barrel state parameter acquisition module 1 is used for acquiring the state parameters of the low-pressure circulation barrel when a system starting instruction is received;
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 adiabatic air cooler and the operation parameters of 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-insulating air cooler so as to enable the liquid level of carbon dioxide in the heat-insulating air cooler to be zero;
And the secondary throttling valve adjusting module 5 is used for adjusting the opening degree of the secondary throttling valve according to the operation 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, when a start command for starting the carbon dioxide transcritical ice rink refrigeration system to perform ice rink refrigeration is received, the refrigerant liquid amount control device of the carbon dioxide transcritical ice rink refrigeration system provided by the embodiment of the application obtains the low-pressure circulation barrel state parameter, and when the low-pressure circulation barrel state parameter meets the preset starting condition, the compressor unit is controlled to enter the running state, and in the running process of the compressor unit, the running parameters of the compressor unit including the operation parameters of the adiabatic air cooler and the operation parameters of the flash evaporator are obtained, so that the adjustment of the opening degree of the primary throttling electronic expansion valve and the opening degree of the secondary throttling electronic expansion valve is realized, the carbon dioxide liquid level in the adiabatic air cooler is zero, and the carbon dioxide liquid level in the flash steam reaches the preset liquid level value only meeting the flash air liquid seal, thereby achieving the purpose of reducing the filling amount of the carbon dioxide refrigerant as much as possible, and effectively reducing the safety risk.
In one embodiment of the present application, the low pressure circulation tank status parameter may include a low pressure circulation tank refrigerant 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 tank refrigerant level reaches a sum of a preset minimum liquid level and a preset liquid level return difference.
In one embodiment of the application, the refrigerant liquid amount control device of the carbon dioxide transcritical ice rink refrigerating system can further comprise a high liquid level alarm module, which is used for acquiring the refrigerant liquid level of the low-pressure circulation barrel in real time under the running state; and when the refrigerant liquid level of the low-pressure circulating barrel reaches the preset maximum liquid level, outputting a high liquid level alarm signal.
In one 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 tank pressure monitoring module, configured to obtain a low pressure circulation tank 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; 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, the compressor unit is controlled to restart.
In one embodiment of the present application, the adiabatic air cooler operating parameters may include an adiabatic air cooler outlet temperature, and the primary throttle 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; the opening degree of the primary throttling electronic expansion valve is regulated so as to enable the outlet pressure of the adiabatic air cooler to reach a target value.
In one embodiment of the present application, the primary throttling electronic expansion valve adjusting module 4 may be further configured to adjust the primary throttling electronic expansion valve to close when the target value is lower than a preset minimum threshold value before the opening degree of the primary throttling electronic expansion valve is adjusted to make the outlet pressure of the adiabatic air cooler reach the target 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; when the target value is between the preset minimum threshold value and the preset maximum threshold value, the step of adjusting the opening degree of the one-time throttling electronic expansion valve so that the outlet pressure of the adiabatic air cooler reaches the target value is performed.
In one embodiment of the present application, the flash evaporator operation parameter may include a flash gas 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 the opening degree corresponding to the flash gas liquid level set value according to the mapping relationship between the flash gas liquid level and the opening degree of the secondary throttling electronic expansion valve.
For the description of the apparatus provided by the embodiment of the present application, reference is made to the above method embodiment, and the description of the embodiment of the present application is omitted here.
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 a processor for executing the computer program to realize the steps of the method for controlling the refrigerant liquid amount of the carbon dioxide transcritical ice rink refrigerating system.
For the introduction of the system provided by the embodiment of the present application, please refer to the above method embodiment, and the description of the embodiment of the present application is omitted here.
An embodiment of the present application provides a computer readable storage medium having a computer program stored thereon, where the computer program, when executed by a processor, performs the steps of a method for controlling a refrigerant fluid amount of a carbon dioxide transcritical ice rink refrigeration system as described above.
The computer readable storage medium may include: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
For the description of the computer-readable storage medium provided in the embodiment of the present application, reference is made to the above method embodiment, and the description of the embodiment of the present application is omitted here.
In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
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 elements and steps are described above generally in terms of functionality in order to clearly illustrate the 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 solution. 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 scheme provided by the application is described in detail. The principles and embodiments of the present application have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present application and its core ideas. It should be noted that it will be apparent to those skilled in the art that the present application may be modified and practiced without departing from the spirit of the present application.

Claims (9)

1. A method for controlling the amount of refrigerant liquid in a carbon dioxide transcritical ice rink refrigeration system, said carbon dioxide transcritical ice rink refrigeration system comprising: the compressor unit includes first compressor, second compressor, first regenerator, second regenerator, flash vessel and adiabatic air cooler, first regenerator second regenerator the adiabatic air cooler all connect in the flash vessel, first compressor connect in first regenerator, second compressor connect in second regenerator, first compressor with the second compressor all connect in adiabatic air cooler, first regenerator with be provided with the secondary throttle electronic expansion valve on the connecting line between low pressure circulation bucket is connected and it is provided with the secondary throttle electronic expansion valve on the connecting line between the flash vessel, the method includes:
when a system starting instruction is received, acquiring a low-pressure circulation barrel state parameter, wherein the low-pressure circulation barrel state parameter comprises the refrigerant liquid level of the low-pressure circulation barrel;
when the low-pressure circulation barrel state parameter meets a preset starting condition, controlling the compressor unit to enter an operating state, wherein the method comprises the following steps of: when the refrigerant liquid level of the low-pressure circulation barrel reaches the sum of a preset minimum liquid level and a preset liquid level return difference, controlling the compressor unit to enter an operating state;
Acquiring the operation parameters of the adiabatic air cooler and the operation parameters of the flash evaporator of the compressor unit in the operation state;
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 valve according to the operation 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.
2. The method of controlling the amount of refrigerant liquid in a carbon dioxide transcritical ice rink refrigeration system according to claim 1, further comprising:
acquiring the refrigerant liquid level of the low-pressure circulation barrel in real time in the running state;
and outputting a high liquid level alarm signal when the liquid level of the low-pressure circulating barrel refrigerant reaches a preset maximum liquid level.
3. The method of controlling the amount of refrigerant liquid in a carbon dioxide transcritical ice rink refrigeration system according to claim 2, 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.
4. The method of claim 1, wherein the adiabatic air cooler operating parameters include an adiabatic air cooler outlet temperature, and wherein adjusting the opening degree of the primary throttling electronic expansion valve to zero the carbon dioxide level in the adiabatic air cooler according to the adiabatic air cooler operating parameters comprises:
determining a target value of the outlet pressure of the adiabatic air cooler according to the outlet temperature of the adiabatic air cooler;
and adjusting the opening degree of the primary throttling electronic expansion valve so as to enable the outlet pressure of the adiabatic air cooler to reach the target value.
5. The method of controlling the amount of refrigerant liquid in a carbon dioxide transcritical ice rink refrigeration system according to claim 4, wherein said adjusting the opening degree of said primary throttle electronic expansion valve further comprises, before said adiabatic air cooler outlet pressure reaches said target value:
when the target value is lower than a preset minimum threshold value, the primary throttling electronic expansion valve is regulated 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 adiabatic air cooler to reach the target value.
6. The method of claim 1, wherein the flash evaporator operating parameter comprises a flash vapor level set point, and wherein the adjusting the opening of the secondary throttle valve according to the flash evaporator operating parameter to achieve the liquid seal comprises:
and adjusting the opening degree of the secondary throttling electronic expansion valve to the opening degree corresponding to the flash gas liquid level set value according to the mapping relation between the flash gas liquid level and the opening degree of the secondary throttling electronic expansion valve.
7. A refrigerant liquid level control device for a carbon dioxide transcritical ice rink refrigeration system, the carbon dioxide transcritical ice rink refrigeration system comprising: the compressor unit includes first compressor, second compressor, first regenerator, second regenerator, flash vessel and adiabatic air cooler, first regenerator second regenerator the adiabatic air cooler all connect in the flash vessel, first compressor connect in first regenerator, second compressor connect in second regenerator, first compressor with the second compressor all connect in adiabatic air cooler, first regenerator with be provided with the secondary throttle electronic expansion valve on the connecting line between low pressure circulation bucket is connected and it is provided with the secondary throttle electronic expansion valve on the connecting line between the flash vessel, the device includes:
The system comprises a low-pressure circulation barrel state parameter acquisition module, a low-pressure circulation barrel state parameter generation module and a low-pressure circulation barrel control module, wherein the low-pressure circulation barrel state parameter acquisition module is used for acquiring a low-pressure circulation barrel state parameter when a system starting instruction is received, and the low-pressure circulation barrel state parameter comprises a low-pressure circulation barrel refrigerant liquid level;
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 circulating barrel meet preset starting conditions;
the compressor unit operation module is further used for controlling the compressor unit to enter an operation state when the refrigerant liquid level of the low-pressure circulation barrel reaches the sum of a preset minimum liquid level and a preset liquid level return difference;
the compressor unit operation parameter acquisition module is used for acquiring the operation parameters of the adiabatic air cooler and the operation parameters of 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-insulating air cooler so as to enable the carbon dioxide liquid level in the heat-insulating air cooler;
and the secondary throttling valve adjusting module is used for adjusting the opening degree of the secondary throttling valve according to the operation 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.
8. 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 of a carbon dioxide transcritical ice rink refrigeration system according to any of claims 1 to 6 when executing said computer program.
9. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the method for controlling the refrigerant liquid amount of a carbon dioxide transcritical ice rink refrigeration system according to any of claims 1 to 6.
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