CN213657167U - Transcritical carbon dioxide continuous ice making circulation control system - Google Patents
Transcritical carbon dioxide continuous ice making circulation control system Download PDFInfo
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- CN213657167U CN213657167U CN202022431669.XU CN202022431669U CN213657167U CN 213657167 U CN213657167 U CN 213657167U CN 202022431669 U CN202022431669 U CN 202022431669U CN 213657167 U CN213657167 U CN 213657167U
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Abstract
The utility model discloses a continuous ice making cycle control system of transcritical carbon dioxide. The utility model provides an ice-making cycle with an ejector and a heat regenerator suitable for carbon dioxide, which can greatly improve COP of the carbon dioxide in a low-temperature refrigeration area; with the trend of environmental protection of the use of the refrigerant and the maturity of the carbon dioxide refrigeration technology, the carbon dioxide can well replace the traditional refrigerant; the utility model provides a double evaporators connect in parallel, realize when first ice-making evaporator is taken off ice, second ice-making evaporator does not have interval continuous ice making, has reduced the refrigerant and has not utilized refrigeration during the period of taking off ice, and has shortened ice-making time, has improved unit interval ice-making output; the inlet gas of the compressor is carbon dioxide gas which is discharged from a gas-phase outlet of the gas-liquid separator and has no liquid state, so that the phenomenon that a small part of hot gas is heated and liquefied in an evaporator during deicing in the prior art and the accumulated liquid enters the compressor to cause liquid impact on the compressor is avoided; continuous ice making is realized, and the ice making efficiency is improved.
Description
Technical Field
The utility model relates to an ice making technology, concretely relates to continuous ice making cycle control system of transcritical carbon dioxide.
Background
With the continuous improvement of the objective demand of China on the cold chain, the ice making industry gradually has wide market prospect with the change of the life style of people. Two important aspects of current ice making systems are environmental concerns and energy costs. Some of the traditional refrigerants harmful to the environment, carbon dioxide (CO), have been excluded from the market2) As an environment-friendly natural refrigerant, the refrigerant has excellent environmental friendliness and thermodynamic property, and CO2Are considered to be ideal refrigerant substitutes for ice-making systems.
Because the HCFCs, HFCs and CFCs of the traditional refrigerants have damage to the ozone layer, the traditional refrigerants are gradually eliminated and replaced, and natural working media CO2Has received much attention as a refrigerant. At present, CO2Has been used in various industries, such as transcritical CO2Household heat pump water heater and transcritical CO2Vending machines, etc.; CO 22Also in the ice and snow industry, e.g. transcritical CO2Snow making machine, 2022 winter Olympic project venue using transcritical CO2The refrigeration cycle makes ice. The ice making machine industry is rapidly developed with the increase of the demand of industrial ice and domestic ice, but the scale of the industry is generally small, and the product quality is also different. The ice removing form of the ice making machine is mainly organic at presentMechanical deicing, warm water deicing, electric heating deicing, hot gas deicing and the like, and aiming at the direct cooling type ice brick machine which mostly uses hot gas deicing and the like, hot gas deicing is carried out firstly, and then a mechanical transmission device is adopted to push out ice blocks.
CO2The application is less in the existing industrial and commercial ice making systems, on one hand, the coefficient of performance cop (coefficient of performance) is lower, and the difference is larger with the commonly used refrigerants of the existing ice making systems such as R22, R134a and R404A. On the other hand, the conventional ice making system cannot realize continuous ice making and ice removing, and the ice removing time is long, so that the ice making efficiency in unit time is low; and the high temperature high pressure refrigerant gas that the compressor came out when bypass steam is taken off ice directly communicates the evaporimeter, utilizes the heat to take off ice, and this in-process is owing to be the condensation process, has partial refrigerant can liquefy, and the liquid of gathering can directly get into the compressor, leads to the compressor the inside and just causes the liquid hammer easily, easily forms the liquid hammer and damages the compressor.
Disclosure of Invention
To the traditional refrigerant such as R22 commonly used in the ice-making industry at present, R134a and R404A not friendly problem to the environment to and the low not enough of carbon dioxide low temperature ice-making cycle inefficiency, the utility model provides a continuous ice-making cycle control system of transcritical carbon dioxide.
The utility model discloses a continuous ice-making circulation control system of transcritical carbon dioxide includes: the system comprises a compressor, an oil separator, a gas cooler, a liquid receiver, a dryer, a heat regenerator, an ejector, a carbon dioxide gas-liquid separator, a first throttle valve, a second throttle valve, first to tenth electromagnetic valves, first to fourth one-way valves, a first group of ice making evaporators and a second group of ice making evaporators; the outlet of the compressor is connected to the inlet of the oil separator through a pipeline, the oil outlet of the oil separator is connected to the oil return port of the compressor through an oil return pipe, the gas outlet of the oil separator is connected to the inlet of the gas cooler through a pipeline, and a tenth electromagnetic valve is arranged on the pipeline between the oil separator and the gas cooler; the outlet of the gas cooler is connected to the inlet of the liquid receiver through a pipeline, and the gas phase outlet of the liquid receiver is connected to the inlet of the dryer through a pipeline; the outlet of the dryer is connected to the inlet of the low-temperature end of the heat regenerator through a pipeline; the outlet of the low-temperature end of the heat regenerator is connected to the main fluid inlet of the ejector through a pipeline; the liquid phase outlet of the liquid receiver is connected to the secondary fluid inlet of the ejector through a pipeline; the outlet of the ejector is connected to the inlet of the carbon dioxide gas-liquid separator through a pipeline; a gas phase outlet at the top end of the carbon dioxide gas-liquid separator is connected to a high-temperature end inlet of the heat regenerator through a heat regeneration pipeline, and a high-temperature end outlet of the heat regenerator is connected to an inlet of the compressor; a liquid phase outlet at the bottom end of the carbon dioxide gas-liquid separator is divided into two parallel branch pipelines by a pipeline, a first branch pipeline is connected to the first group of ice making evaporators, and a first electromagnetic valve, a first throttle valve and a first one-way valve are sequentially arranged on the first branch pipeline; the second branch pipeline is connected to the second group of ice making evaporators, and a second electromagnetic valve, a second throttle valve and a second one-way valve are sequentially arranged on the second branch pipeline; the gas outlet of the carbon dioxide gas-liquid separator at the top end is also connected with a bypass pipeline and is combined with the pipeline of the liquid outlet of the carbon dioxide gas-liquid separator at the bottom end; the outlet of the first ice-making evaporator group and the outlet of the second ice-making evaporator group are combined with a pipeline connected with a liquid phase outlet of the liquid receiver through pipelines and connected to a secondary fluid inlet of the ejector, a fifth electromagnetic valve is arranged on the pipeline at the outlet of the first ice-making evaporator group, and a sixth electromagnetic valve is arranged on the pipeline at the outlet of the second ice-making evaporator group; the outlet of the oil separator is also connected to the outlets of the first group of ice-making evaporators and the second group of ice-making evaporators through pipelines respectively, a ninth electromagnetic valve is arranged at the outlet of the oil separator on the pipeline connecting the outlet of the oil separator to the first group of ice-making evaporators and the second group of ice-making evaporators, a seventh electromagnetic valve is arranged at the outlet of the first group of ice-making evaporators, and an eighth electromagnetic valve is arranged at the outlet of the second group of ice-making evaporators; the inlets of the first group of ice-making evaporators and the second group of ice-making evaporators are also connected to the inlet of the gas cooler through a pipeline, a third electromagnetic valve and a third one-way valve are sequentially arranged at the inlet of the first group of ice-making evaporators on the pipeline, and a fourth electromagnetic valve and a fourth one-way valve are sequentially arranged at the inlet of the second group of ice-making evaporators on the pipeline.
The first set of ice-making evaporators comprises one or more ice-making evaporators connected in parallel; the second set of ice-making evaporators includes one or more ice-making evaporators connected in parallel.
A bypass pipeline is arranged at a top gas outlet of the carbon dioxide gas-liquid separator, so that the constant flow entering the compressor is ensured.
The utility model discloses a solenoid valve, solenoid valve are connected to logic circuit, and the switching of logic circuit control solenoid valve, solenoid valve come the cooperation logic circuit control refrigerant CO2Whether the fluid can pass through. The check valve is used for preventing the refrigerant from flowing back and ensuring the unidirectional flow.
The liquid receiver is used for storing CO remained in the ice-making evaporator in the ice-removing mode2A liquid.
The dryer is used for collecting and removing water in the refrigerant pipeline, and simultaneously filtering impurities in the pipeline, so that stable operation of ice making is guaranteed.
Because the transcritical carbon dioxide circulation provided by the utility model belongs to high-pressure circulation, the compressor can adopt a piston compressor; the oil separator can adopt a centrifugal oil separator; the carbon dioxide gas cooler can adopt different forms according to the ambient temperature, namely a water-cooled gas cooler is adopted when the ambient temperature is relatively high, and an air-cooled gas cooler is adopted when the ambient temperature is relatively low; the ejector adopts an adjustable nozzle high-pressure ejector; the gas-liquid separator can adopt a vertical gas-liquid separator; the ice making evaporator is designed according to the actual required ice type and ice thickness.
The ice making time is determined according to the power of the ice making cycle control system and the thickness of ice blocks to be made according to the process requirement; the deicing time is determined according to the volume and thickness of the prepared ice blocks, generally, a water film is formed on the contact surface of the evaporator during deicing to finish deicing, and the deicing time is naturally shorter than the ice making time.
The utility model has the advantages that:
(1) the ice making cycle with the ejector and the heat regenerator suitable for carbon dioxide is provided, is suitable for occasions needing hot gas for deicing, such as a direct-cooling block ice machine, a plate ice machine and the like, and can greatly improve COP (coefficient of performance) of carbon dioxide transcritical cycle in a low-temperature refrigeration area;
(2) the proposed ice-making cycle control system suitable for carbon dioxide is close to or even higher than the current traditional ice-making refrigerant R404A in terms of low-temperature ice-making performance COP, and with the trend of environmental protection of the use of the refrigerant and the maturity of the carbon dioxide refrigeration technology, the carbon dioxide can well replace the traditional refrigerant;
(3) the double evaporators are connected in parallel, so that the second ice making evaporator can make ice continuously without intervals while the first ice making evaporator is de-iced, and compared with the conventional hot gas de-iced mode, the phenomenon that the cold energy of a refrigerant is not utilized in the de-iced period is eliminated, the ice making time is shortened, and the ice making yield in unit time is improved;
(4) the utility model discloses a compressor admits air is the carbon dioxide gas who is come out by vapour and liquid separator's gas phase export, does not have the liquid, and small part steam is heated in the evaporimeter and is liquefied when having avoided prior art to de-ice, and the liquid of gathering can get into the compressor, leads to the fact the liquid to hit to the compressor.
Therefore, compared with the prior art, the utility model discloses can show and solve traditional ice machine refrigerant environmental protection and replace, carbon dioxide low temperature refrigeration inefficiency scheduling problem, the cold volume of refrigerant is extravagant when overcoming bypass steam and deicing and easily causes shortcomings such as compressor liquid hits, realizes making ice in succession, makes ice-making efficiency improve, compares ice-making time with prior art and shortens 15% -20%, and unit interval ice-making output improves about 20%, reduces the energy consumption simultaneously.
Drawings
FIG. 1 is a schematic diagram of one embodiment of a transcritical carbon dioxide continuous ice making cycle control system of the present invention;
fig. 2 is a flowchart of a control method of an embodiment of the transcritical carbon dioxide continuous ice making cycle control system of the present invention;
fig. 3 is a schematic diagram of a cycle of an embodiment of the system for controlling a transcritical carbon dioxide continuous ice making cycle of the present invention, wherein (a) - (d) are schematic diagrams of cycles in four modes, respectively.
Detailed Description
The invention will be further elucidated by means of specific embodiments in the following with reference to the drawings.
As shown in fig. 1, the system for controlling a transcritical carbon dioxide continuous ice making cycle of the present embodiment includes: the system comprises a compressor 1, an oil separator 2, a gas cooler 4, a liquid receiver 5, a dryer 6, a heat regenerator 7, an ejector 8, a carbon dioxide gas-liquid separator 9, a first throttle valve 101, a second throttle valve 102, first to tenth electromagnetic valves 31 to 310, first to fourth one-way valves 111 to 114, a first group of ice-making evaporators 121 and a second group of ice-making evaporators 122; wherein, the outlet of the compressor 1 is connected to the inlet of the oil separator through a pipeline, and the oil outlet of the oil separator is connected to the oil return port of the compressor through an oil return pipe; the gas outlet of the oil separator is connected to the inlet of the gas cooler 4 through a pipeline, and a tenth electromagnetic valve 310 is arranged on the pipeline between the oil separator and the gas cooler; the outlet of the gas cooler 4 is connected to the inlet 5 of the liquid receiver by a pipe, and the gas phase outlet of the liquid receiver 5 is connected to the inlet of the dryer 6 by a pipe; the outlet of the dryer 6 is connected to the inlet of the low-temperature end of the regenerator 7 through a pipeline; the outlet of the low-temperature end of the regenerator is connected to the main fluid inlet of the ejector 8 through a pipeline; the liquid phase outlet of the liquid receiver 5 is connected by a pipe to the secondary fluid inlet of the ejector 8; the outlet of the ejector 8 is connected to the inlet of the carbon dioxide gas-liquid separator 9 through a pipe; a gas-phase outlet at the top end of the carbon dioxide gas-liquid separator 9 is connected to a high-temperature end inlet of the heat regenerator 7 through a heat regeneration pipeline, and a high-temperature end outlet of the heat regenerator 7 is connected to an inlet of the compressor 1; a liquid phase outlet at the bottom end of the carbon dioxide gas-liquid separator 9 is divided into two parallel branch pipelines by a pipeline, the first branch pipeline is connected to a first group of ice making evaporators 121, a first electromagnetic valve 31, a first throttle valve 101 and a first check valve 111 are sequentially arranged on the first branch pipeline, and the first group of ice making evaporators comprise one ice making evaporator; a second branch pipeline is connected to a second group of ice-making evaporators 122, and a second electromagnetic valve 32, a second throttle valve 102 and a second check valve 112 are sequentially arranged on the second branch pipeline, wherein the second group of ice-making evaporators comprises one ice-making evaporator; the gas outlet of the carbon dioxide gas-liquid separator 9 at the top end is also connected with a bypass pipeline and is combined with the pipeline of the liquid outlet of the carbon dioxide gas-liquid separator 9 at the bottom end; outlets of the first group of ice-making evaporators and outlets of the second group of ice-making evaporators are combined with a pipeline connected with a liquid phase outlet of the liquid receiver 5 through pipelines and connected to a secondary fluid inlet of the ejector 8, a fifth electromagnetic valve 35 is arranged on the pipeline at the outlet of the first group of ice-making evaporators, and a sixth electromagnetic valve 36 is arranged on the pipeline at the outlet of the second group of ice-making evaporators; the outlet of the oil separator is also connected to the outlets of the first and second groups of ice-making evaporators respectively through pipelines, and on the pipeline connecting the outlet of the oil separator to the first and second groups of ice-making evaporators, a ninth electromagnetic valve 39 is arranged at the outlet of the oil separator, a seventh electromagnetic valve 37 is arranged at the outlet of the first group of ice-making evaporator 121, and an eighth electromagnetic valve 38 is arranged at the outlet of the second group of ice-making evaporator; the inlets of the first and second sets of ice-making evaporators are also connected to the inlet of the gas cooler 4 by a pipe, on which a third electromagnetic valve 33 and a third check valve 113 are sequentially provided at the inlet of the first set of ice-making evaporators, and on which a fourth electromagnetic valve 34 and a fourth check valve 114 are sequentially provided at the inlet of the second set of ice-making evaporators.
In fig. 2, black indicates that the valve is open and white indicates that the valve is closed.
Because the transcritical carbon dioxide circulation provided by the utility model belongs to high-pressure circulation, the compressor 1 can adopt a piston compressor, and the high-pressure side pressure is 9-10.5 Mpa; the oil separator 2 can adopt a centrifugal oil separator; the gas cooler 4 can adopt different forms according to the ambient temperature, the maximum ambient temperature is not more than 43 ℃, and the minimum ambient temperature is not less than 5 ℃, namely, a water-cooled gas cooler is adopted when the ambient temperature is relatively high, and an air-cooled gas cooler is adopted when the ambient temperature is relatively low; the ejector 8 adopts an adjustable nozzle high-pressure ejector, and the entrainment rate of the ejector 8 is about 0.5; the carbon dioxide gas-liquid separator 9 can adopt a vertical gas-liquid separator; the first and second ice-making evaporators 121 and 122 are designed according to the actual ice type and ice thickness, the evaporation temperature is-20 ℃ to-15 ℃, the inlet water temperature is not less than 5 ℃ at the lowest and not more than 35 ℃ at the highest.
The regenerator has four ports: a low temperature end inlet, a low temperature end outlet, a high temperature end inlet and a high temperature end outlet; the double-pipe heat exchanger comprises an inner pipe and an outer pipe, wherein the outer pipe is coaxially sleeved outside the inner pipe and is not communicated with the inner pipe, and the two ends of the inner pipe are respectively provided with a low-temperature end inlet and a low-temperature end outlet; the two ends of the outer pipe are respectively provided with a high-temperature end inlet and a high-temperature end outlet.
The control method of the transcritical carbon dioxide continuous ice making cycle control system of the embodiment, as shown in fig. 2, includes four modes of sequential cycles:
when the ice making machine is started, the control system is in a mode that the first group of ice making evaporators make ice and the second group of ice making evaporators are idle;
1) mode in which the first set of ice-making evaporators make ice while the second set of ice-making evaporators are idle:
as shown in fig. 3(a), the tenth solenoid valve is opened and the ninth solenoid valve is closed, the first solenoid valve 31, the first throttle valve 101 and the first check valve 111 are opened and the second solenoid valve 32, the second throttle valve 102 and the second check valve 112 are closed, the fifth solenoid valve 35 is opened and the sixth solenoid valve 36 is closed, the third solenoid valve 33 and the third check valve 113 and the fourth solenoid valve 34 and the fourth check valve 114 are closed, and the seventh solenoid valve 37 and the eighth solenoid valve 38 are closed;
a) the refrigerant is compressed into high-temperature and high-pressure supercritical CO by the compressor 12The gas flows through the oil separator 2 through a pipeline to perform oil-gas separation on the refrigerant, the lubricating oil mixed in the refrigerant flows out from an oil outlet and returns to an oil return port of the compressor 1 through an oil return pipe, and the separated pure CO2The gas flows through the tenth solenoid valve 310 and enters the gas cooler 4 for cooling, the temperature is reduced, the pressure is unchanged, and the gas is changed into low-temperature high-pressure CO2The gas enters the drier 6 via the liquid receiver 5 to filter moisture and residue, and then enters the regenerator 7 to further reduce CO2Temperature, low temperature, high pressure CO2Gas enters the primary fluid inlet of the injector 8 as primary fluid;
b) low temperature and low pressure CO exiting from ejector 82The gas enters a carbon dioxide gas-liquid separator 9;
c) low temperature and low pressure CO in carbon dioxide gas-liquid separator 92Gas is delivered to the inlet of the compressor 1 through the gas outlet and the heat regenerator 7;
d) low temperature and low pressure CO of carbon dioxide gas-liquid separator 92The liquid passes through the liquid outlet and is in excess with CO at the top gas outlet of the carbon dioxide gas-liquid separator 92The gas enters the first throttling valve 101 through the first electromagnetic valve 31 after passing through the bypass pipeline and mixed to be cooled and depressurized to reach the evaporation temperature required by ice making, and is conveyed to the first group of ice making evaporators 121 through the first one-way valve 111 to make ice;
e) low temperature and low pressure CO in the first set of ice-making evaporators 1212The gas is combined with the liquid phase outlet of the liquid receiver 5 through the fifth electromagnetic valve 35 and is used as a secondary fluid to be conveyed to the secondary fluid inlet of the ejector 8;
2) mode in which the first group of ice-making evaporators de-ice while the second group of ice-making evaporators make ice:
as shown in fig. 3(b), the tenth solenoid valve is closed and the ninth solenoid valve is opened, the first solenoid valve 31, the first throttle valve 101 and the first check valve 111 are closed and the second solenoid valve 32, the second throttle valve 102 and the second check valve 112 are opened, the fifth solenoid valve 35 is closed and the sixth solenoid valve 36 is opened, the third solenoid valve 33 and the third check valve 113 are opened and the closed state of the fourth solenoid valve 34 and the fourth check valve 114 is maintained, and the seventh solenoid valve is opened and the closed state of the eighth solenoid valve 38 is maintained;
a) the refrigerant is compressed into high-temperature and high-pressure supercritical CO by the compressor 12The gas enters the oil separator 2 through a pipeline for oil-gas separation, the lubricating oil mixed in the refrigerant flows out from an oil outlet and returns to an oil return port of the compressor 1 through an oil return pipe, and the separated pure CO2The gas flows through the ninth electromagnetic valve 39 and the seventh electromagnetic valve 37 and reversely enters the first group of ice making evaporators 121 for heating and deicing, and high-temperature and high-pressure CO is obtained after deicing2The gas is connected to the gas cooler 4 through a pipeline by the third electromagnetic valve 33 and the third one-way valve 113 to be cooled and changed into low-temperature high-pressure CO2The gas enters a drier 6 through a liquid receiver 5 to filter moisture and residues and then enters the heat recoveryFurther CO reduction by means of 72Temperature, low temperature, high pressure CO2Gas enters the primary fluid inlet of the injector 8 as primary fluid;
b) low temperature and low pressure CO emitted from ejector 82The gas enters a carbon dioxide gas-liquid separator 9;
c) low temperature and low pressure CO in carbon dioxide gas-liquid separator 92Gas is delivered to the inlet of the compressor 1 through the gas outlet via the regenerator 7;
d) low temperature and low pressure CO of carbon dioxide gas-liquid separator 92The liquid passes through the liquid outlet, and the liquid and the redundant carbon dioxide gas at the gas outlet of the carbon dioxide gas-liquid separator 9 pass through a bypass pipeline, are mixed and then enter the second throttling valve 102 through the second electromagnetic valve 32 to be cooled and depressurized to reach the evaporation temperature required by ice making, and are conveyed into the second group of ice making evaporators 122 through the second one-way valve 112, and the second group of ice making evaporators continuously make ice while the first group of ice making evaporators 121 de-ice;
e) low temperature and low pressure CO in the second set of ice-making evaporators 1222The gas is combined with the liquid phase outlet of the liquid receiver 5 through a sixth electromagnetic valve 36 through a pipeline and is used as a secondary fluid to be conveyed to the secondary fluid inlet of the ejector 8;
3) the ice-shedding time is less than the ice-making time, and the first group of ice-making evaporators 121 are in a mode of idling after ice-shedding is completed while the second group of ice-making evaporators 122 still make ice:
as shown in fig. 3(c), the tenth solenoid valve is opened and the ninth solenoid valve is closed, the closed state of the first solenoid valve 31, the first throttle valve 101, and the first check valve 111 is maintained and the open state of the second solenoid valve 32, the second throttle valve 102, and the second check valve 112 is maintained, the closed state of the fifth solenoid valve 35 is maintained and the open state of the sixth solenoid valve 36 is maintained, the third solenoid valve 33 and the third check valve 113 are closed and the closed state of the fourth solenoid valve 34 and the fourth check valve 114 is maintained, and the seventh solenoid valve is closed and the closed state of the eighth solenoid valve 38 is maintained;
a) the refrigerant is compressed into high-temperature and high-pressure supercritical CO by the compressor 12Gas, flowing through the oil separator 2 through the pipe to the refrigerantPerforming oil-gas separation, returning the lubricating oil mixed in the refrigerant from an oil outlet to an oil return port of the compressor 1 through an oil return pipe, and separating pure CO2The gas flows through the tenth solenoid valve 310 and enters the gas cooler 4 for cooling, the temperature is reduced, the pressure is unchanged, and the gas is changed into low-temperature high-pressure CO2The gas enters the drier 6 via the liquid receiver 5 to filter moisture and residue, and then enters the regenerator 7 to further reduce CO2Temperature, low temperature and high pressure CO2Gas enters the primary fluid inlet of the injector 8 as primary fluid;
b) low temperature and low pressure CO emitted from ejector 82The gas enters a carbon dioxide gas-liquid separator 9;
c) low temperature and low pressure CO in carbon dioxide gas-liquid separator 92Gas is delivered to the inlet of the compressor 1 through the gas outlet via the regenerator 7;
d) low temperature and low pressure CO of carbon dioxide gas-liquid separator 92The liquid passes through the liquid outlet and the redundant carbon dioxide gas at the gas outlet of the carbon dioxide gas-liquid separator 9 passes through a bypass pipeline, is mixed and then enters the second throttling valve 102 through the second electromagnetic valve 32 to be cooled and depressurized to reach the evaporation temperature required by ice making, and is conveyed into the second group of ice making evaporators 122 through the second one-way valve 112 to make ice;
e) low temperature and low pressure CO in the second set of ice-making evaporators 1222The gas is combined with the liquid phase outlet of the liquid receiver 5 through a sixth electromagnetic valve 36 through a pipeline and is used as a secondary fluid to be conveyed to the secondary fluid inlet of the ejector 8;
4) mode in which the first group ice-making evaporator 121 makes ice while the second group ice-making evaporator 122 de-ices:
as shown in fig. 3(d), the tenth solenoid valve is closed and the ninth solenoid valve is opened, the first solenoid valve 31, the first throttle valve 101 and the first check valve 111 are opened and the second solenoid valve 32, the second throttle valve 102 and the second check valve 112 are closed, the fifth solenoid valve 35 is opened and the sixth solenoid valve 36 is closed, the closed state of the third solenoid valve 33 and the third check valve 113 is maintained and the fourth solenoid valve 34 and the fourth check valve 114 are opened, the closed state of the seventh solenoid valve is maintained and the eighth solenoid valve 38 is opened;
a) the refrigerant is compressed into high-temperature and high-pressure supercritical CO by the compressor 12The gas flows through the oil separator 2 through a pipeline to perform oil-gas separation on the refrigerant, the lubricating oil mixed in the refrigerant flows out from an oil outlet and returns to an oil return port of the compressor 1 through an oil return pipe, and the separated pure CO2Reversely flows through the ninth electromagnetic valve 39 and the eighth electromagnetic valve 38 and enters the second group ice-making evaporator 122 for heating and deicing, and high-temperature and high-pressure CO is obtained after deicing2The gas is connected to the gas cooler 4 through a pipeline by the fourth electromagnetic valve 34 and the fourth one-way valve 114 for cooling, and is changed into low-temperature high-pressure CO2The gas enters the drier 6 via the liquid receiver 5 to filter moisture and residue, and then enters the regenerator 7 to further reduce CO2Temperature, low temperature and high pressure CO2Gas enters the primary fluid inlet of the injector 8 as primary fluid;
b) low temperature and low pressure CO emitted from ejector 82The gas enters a carbon dioxide gas-liquid separator 9;
c) low temperature and low pressure CO in carbon dioxide gas-liquid separator 92Gas is conveyed to the inlet of the compressor 1 through a heat regenerator 7 through a heat regeneration pipeline;
d) low temperature and low pressure CO of carbon dioxide gas-liquid separator 92The liquid passes through a liquid outlet at the bottom end, and the liquid and the redundant carbon dioxide gas at the gas outlet at the top end of the carbon dioxide gas-liquid separator 9 pass through a bypass pipeline, are mixed, then enter the first throttling valve 101 through the first electromagnetic valve 31 to be cooled and depressurized to reach the evaporation temperature required by ice making, and are conveyed into the first group of ice making evaporators 121 through the first one-way valve 111, and continuous ice making is carried out while ice is removed in the second group of ice making evaporators 122;
e) low temperature and low pressure CO in the first set of ice-making evaporators 1212The gas is combined with the liquid phase outlet of the liquid receiver 5 through a fifth electromagnetic valve 35 through a pipeline and is used as a secondary fluid to be conveyed to the secondary fluid inlet of the ejector 8;
in this embodiment, when the compressor consumes 100KW, the time required for making 1ton of ice is about 33min, the ice-shedding time is 1-2 min, and since ice shedding is easier, the ice-shedding time is naturally shorter than the ice-making time, after the ice-shedding of the second ice-making evaporator 122 is completed, the first ice-making evaporator 121 is still in the ice-making state, and the mode of steps 1) -4) is repeated to perform continuous cycle work of ice making and ice shedding.
Finally, it is noted that the disclosed embodiments are intended to aid in further understanding of the invention, but will be understood by those skilled in the art that: various substitutions and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the present invention should not be limited to the embodiments disclosed, and the scope of the present invention is defined by the appended claims.
Claims (4)
1. A transcritical carbon dioxide continuous ice making cycle control system, comprising: the system comprises a compressor, an oil separator, a gas cooler, a liquid receiver, a dryer, a heat regenerator, an ejector, a carbon dioxide gas-liquid separator, a first throttle valve, a second throttle valve, first to tenth electromagnetic valves, first to fourth one-way valves, a first group of ice making evaporators and a second group of ice making evaporators; the outlet of the compressor is connected to the inlet of the oil separator through a pipeline, the oil outlet of the oil separator is connected to the oil return port of the compressor through an oil return pipe, the gas outlet of the oil separator is connected to the inlet of the gas cooler through a pipeline, and a tenth electromagnetic valve is arranged on the pipeline between the oil separator and the gas cooler; the outlet of the gas cooler is connected to the inlet of the liquid receiver through a pipeline, and the gas phase outlet of the liquid receiver is connected to the inlet of the dryer through a pipeline; the outlet of the dryer is connected to the inlet of the low-temperature end of the heat regenerator through a pipeline; the outlet of the low-temperature end of the heat regenerator is connected to the main fluid inlet of the ejector through a pipeline; the liquid phase outlet of the liquid receiver is connected to the secondary fluid inlet of the ejector through a pipeline; the outlet of the ejector is connected to the inlet of the carbon dioxide gas-liquid separator through a pipeline; a gas phase outlet at the top end of the carbon dioxide gas-liquid separator is connected to a high-temperature end inlet of the heat regenerator through a heat regeneration pipeline, and a high-temperature end outlet of the heat regenerator is connected to an inlet of the compressor; a liquid phase outlet at the bottom end of the carbon dioxide gas-liquid separator is divided into two parallel branch pipelines by a pipeline, a first branch pipeline is connected to the first group of ice making evaporators, and a first electromagnetic valve, a first throttle valve and a first one-way valve are sequentially arranged on the first branch pipeline; the second branch pipeline is connected to the second group of ice making evaporators, and a second electromagnetic valve, a second throttle valve and a second one-way valve are sequentially arranged on the second branch pipeline; the gas outlet of the carbon dioxide gas-liquid separator at the top end is also connected with a bypass pipeline and is combined with the pipeline of the liquid outlet of the carbon dioxide gas-liquid separator at the bottom end; the outlet of the first ice-making evaporator group and the outlet of the second ice-making evaporator group are combined with a pipeline connected with a liquid phase outlet of the liquid receiver through pipelines and connected to a secondary fluid inlet of the ejector, a fifth electromagnetic valve is arranged on the pipeline at the outlet of the first ice-making evaporator group, and a sixth electromagnetic valve is arranged on the pipeline at the outlet of the second ice-making evaporator group; the outlet of the oil separator is also connected to the outlets of the first group of ice-making evaporators and the second group of ice-making evaporators through pipelines respectively, a ninth electromagnetic valve is arranged at the outlet of the oil separator on the pipeline connecting the outlet of the oil separator to the first group of ice-making evaporators and the second group of ice-making evaporators, a seventh electromagnetic valve is arranged at the outlet of the first group of ice-making evaporators, and an eighth electromagnetic valve is arranged at the outlet of the second group of ice-making evaporators; the inlets of the first group of ice-making evaporators and the second group of ice-making evaporators are also connected to the inlet of the gas cooler through a pipeline, a third electromagnetic valve and a third one-way valve are sequentially arranged at the inlet of the first group of ice-making evaporators on the pipeline, and a fourth electromagnetic valve and a fourth one-way valve are sequentially arranged at the inlet of the second group of ice-making evaporators on the pipeline.
2. The transcritical carbon dioxide continuous ice making cycle control system of claim 1 wherein said first set of ice making evaporators includes one or more ice making evaporators in parallel; the second set of ice-making evaporators includes one or more ice-making evaporators connected in parallel.
3. The system of claim 1, wherein the gas cooler is a water-cooled gas cooler or an air-cooled gas cooler.
4. The transcritical carbon dioxide continuous ice making cycle control system of claim 1 wherein said solenoid valve is connected to a logic circuit.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112161412A (en) * | 2020-10-28 | 2021-01-01 | 北京大学 | Transcritical carbon dioxide continuous ice making cycle control system and control method thereof |
| CN112161412B (en) * | 2020-10-28 | 2024-05-24 | 北京大学 | Transcritical carbon dioxide continuous ice making circulation control system and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112161412A (en) * | 2020-10-28 | 2021-01-01 | 北京大学 | Transcritical carbon dioxide continuous ice making cycle control system and control method thereof |
| CN112161412B (en) * | 2020-10-28 | 2024-05-24 | 北京大学 | Transcritical carbon dioxide continuous ice making circulation control system and control method thereof |
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