A wine steam direct-cooling type cascade heat pump wine steaming system

Abstract

The utility model relates to wine equipment technical field discloses a kind of wine steam direct-cooling type cascade heat pump wine system, comprising: wine device, cascade heat pump device, monitoring module and control module;By using cascade heat pump device, heat recovery and transfer are carried out using the heat gradient difference between high and low temperature levels, effectively improve the comprehensive energy efficiency of heat pump system, overcome the serious problem of heat energy waste of traditional wine system.Through the monitoring module on low temperature level loop real-time acquisition refrigerant return gas temperature parameter and evaporation pressure parameter, dynamic adjustment is carried out to first valve body and second valve body in combination with control module, to accurately control the heat exchange condition in condensation process, improve the control precision of condensation temperature;Since wine steam condensation process is controlled and temperature is accurate, avoid the insufficient condensation or excessive cooling phenomenon caused by condensation temperature fluctuation, and then effectively improve the taste and quality stability of distillation product.

Description

Technical Field

[0001] This utility model relates to the technical field of distillation equipment, specifically to a direct-cooling cascade heat pump distillation system for alcohol vapor. Background Technology

[0002] With increasingly stringent energy conservation and environmental protection requirements, high-temperature cascade heat pumps, due to their high heating temperatures and excellent energy efficiency, are gradually being promoted and applied in fields such as food processing, pharmaceuticals, and chemicals, especially demonstrating good adaptability in traditional distillation processes. Taking the distillation process of fermented beverages such as baijiu as an example, heat pump systems can replace part of traditional fuel boilers, providing the necessary heat source for the distillation kettle, thereby effectively reducing energy consumption and carbon emissions.

[0003] However, the application of existing high-temperature cascade heat pumps in distillation processes is mainly concentrated in the heating stage, and the condensation heat generated is generally dissipated through water cooling or air cooling. Water cooling requires secondary heat exchange with cooling water or other intermediate cooling media. The heat exchange process involves a large temperature difference, resulting in some cooling capacity not being effectively recovered, causing energy loss and hindering further optimization of the overall system energy efficiency. In addition, existing systems generally lack the ability to finely control the temperature curve of the condensation process, making it difficult to flexibly adapt to the precise requirements of different types of wine for the rate of temperature change and fluctuation range during the distillation process. This affects the selective precipitation of target flavor substances and easily leads to unstable product flavor. Production still relies heavily on human experience for adjustment. Utility Model Content

[0004] This invention provides a direct-cooling cascade heat pump distillation system for alcoholic beverages, which solves the problems of poor energy efficiency and insufficient precision in condensation temperature control in existing distillation systems, which can easily lead to poor product quality.

[0005] This utility model provides a direct-cooling cascade heat pump distillation system for alcohol vapor, comprising: a distillation device, a cascade heat pump device, a monitoring module, and a control module; the outlet of the distillation device is connected to an alcohol vapor pipeline for generating alcohol vapor and outputting it to the alcohol vapor pipeline; the cascade heat pump device includes a high-temperature heating circuit and a low-temperature refrigeration circuit; the high-temperature heating circuit is used to heat the distillation device; the low-temperature refrigeration circuit is equipped with a direct-cooling heat exchanger, through which the alcohol vapor flows and exchanges heat with the low-temperature refrigeration circuit, suitable for cooling the alcohol vapor. The vapor in the pipeline is cooled; the high-temperature heating circuit and the low-temperature refrigeration circuit exchange heat through a first heat exchanger; the high-temperature heating circuit is equipped with a first valve body, and the low-temperature refrigeration circuit is equipped with a second valve body; the monitoring module is located on the low-temperature refrigeration circuit to detect the low-temperature refrigerant return gas temperature parameter and the evaporation pressure parameter; the control module is communicatively connected to the monitoring module, and the control module is adapted to receive the refrigerant return gas temperature parameter and the evaporation pressure parameter to control the opening degree of the first valve body and the second valve body in real time.

[0006] Beneficial effects: This invention provides a direct-cooling cascade heat pump distillation system for alcohol vapor. By incorporating a cascade heat pump device, a high-temperature heating circuit heats the distillation apparatus, while a low-temperature cooling circuit exchanges heat with the alcohol vapor in the vapor pipeline via a direct-cooling heat exchanger, thus directly cooling the vapor. By employing a cascade heat pump device, heat recovery and transfer are achieved through the heat gradient difference between the high and low temperature stages, effectively improving the overall energy efficiency of the heat pump system and overcoming the serious heat energy waste problem of traditional distillation systems. A monitoring module located on the low-temperature stage circuit collects real-time refrigerant return gas temperature and evaporation pressure parameters. Combined with a control module, the first and second valves are dynamically adjusted to precisely control the heat exchange conditions during the condensation process, improving the control accuracy of the condensation temperature. Because the alcohol vapor condensation process is controlled and the temperature is precise, insufficient condensation or over-cooling caused by condensation temperature fluctuations is avoided, thereby effectively improving the taste and quality stability of the distilled product. This invention constructs a direct-cooling cascade heat pump distillation system for alcohol vapor, which improves energy efficiency and enhances the precision of alcohol vapor condensation control, significantly improving the quality of the finished distilled spirit. It has high practical value and promising prospects for promotion.

[0007] According to some embodiments of the present invention, the monitoring module includes a return gas temperature sensor and a low-pressure sensor, both of which are communicatively connected to the control module. The return gas temperature sensor is located on the outlet side of the direct-cooling heat exchanger to detect the return gas temperature parameter of the low-temperature stage refrigerant. The low-pressure sensor is located on the low-pressure main pipeline of the low-temperature stage refrigeration circuit to detect the low-temperature stage evaporation pressure parameter.

[0008] According to some embodiments of the present invention, the monitoring module further includes a refrigerant leakage sensor that is communicatively connected to the control module. The refrigerant leakage sensor is located inside the direct-cooling heat exchanger and is used to detect refrigerant leakage signals and feed them back to the control module.

[0009] According to some embodiments of the present invention, an alarm module is also included, which is communicatively connected to the control module. The control module is adapted to receive the refrigerant leak signal and control the activation or deactivation of the alarm module.

[0010] According to some embodiments of this utility model, the outlet end of the distillation device is provided with a third valve body, the outlet of the distillation device is connected to the alcohol vapor pipeline through the third valve body, the third valve body is communicatively connected to the control module, and the control module can control the opening and closing of the third valve body according to the received refrigerant leakage signal.

[0011] According to some embodiments of the present invention, the control module is provided with an anti-freeze protection unit and a safety logic judgment unit. The anti-freeze protection unit stores an anti-freeze temperature threshold. The control module is adapted to convert the low-temperature evaporation pressure parameter into an evaporation temperature parameter. When the evaporation temperature is lower than the anti-freeze temperature threshold, the anti-freeze protection unit controls to reduce the opening of the second valve body. If the evaporation temperature remains below the antifreeze temperature threshold within a preset time, the antifreeze protection unit outputs a freezing risk signal to the safety logic judgment unit.

[0012] According to some embodiments of this utility model, the control module is provided with a leakage protection unit, which is used to output a leakage risk signal to the safety logic judgment unit when the refrigerant leakage detection signal is received; the safety logic judgment unit is adapted to receive the freezing risk signal and / or leakage risk signal to control the third valve body, the cascade heat pump device and the alarm module in real time.

[0013] According to some embodiments of the present invention, the high-temperature stage heating circuit includes a first compressor, the distillation device is provided with a condenser, the refrigerant of the high-temperature stage heating circuit flows out through the outlet of the first compressor, after heat exchange in the condenser, flows through the first valve body, after heat exchange with the refrigerant of the low-temperature stage refrigeration circuit in the first heat exchanger, and then flows back to the first compressor. The low-temperature stage refrigeration circuit includes a second compressor. The refrigerant of the low-temperature stage refrigeration circuit flows out through the outlet of the second compressor, exchanges heat with the alcohol vapor in the direct-cooling heat exchanger, flows through the second valve body, exchanges heat with the refrigerant of the high-temperature stage heating circuit in the first heat exchanger, and then flows back to the second compressor.

[0014] According to some embodiments of this utility model, a heat exchange heating circuit is also included. The heat exchange heating circuit includes a hot water storage tank and a second heat exchanger. Hot water flows through the hot water storage tank and through the condenser to exchange heat with the refrigerant in the high-temperature stage heating circuit. The heated hot water is used to heat and flash evaporate the wine in the wine distillation device. The hot water flows through the second heat exchanger and exchanges heat with the domestic water pipeline in the second heat exchanger before returning to the hot water storage tank.

[0015] According to some embodiments of the present invention, the monitoring module further includes a temperature sensor disposed on the high-temperature stage heating circuit or the heat exchange heating circuit. The temperature sensor is used to detect the high-temperature stage outlet water temperature so that the control module can perform heat matching and protection control. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram illustrating the operating principle of a direct-cooling cascade heat pump distillation system for alcoholic beverages, according to an embodiment of this utility model.

[0018] Explanation of reference numerals in the attached figures: 1. Distillation apparatus; 11. Distillation vapor pipeline; 12. Condenser; 13. Third valve body; 2. Cascade heat pump device; 21. High-temperature stage heating circuit; 22. Low-temperature stage refrigeration circuit; 23. First heat exchanger; 211. First compressor; 212. First valve body; 221. Second compressor; 222. Second valve body; 223. Direct cooling heat exchanger; 3. Heat exchange heating circuit; 31. Hot water storage tank; 32. Second heat exchanger. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] Reference Figure 1As shown, this utility model provides a direct-cooling cascade heat pump distillation system for alcoholic beverages, including: a distillation device 1, a cascade heat pump device 2, a monitoring module, and a control module; the outlet of the distillation device 1 is connected to an alcoholic beverage steam pipeline 11, used to generate alcoholic beverage steam and output it to the alcoholic beverage steam pipeline 11; the cascade heat pump device 2 includes a high-temperature stage heating circuit 21 and a low-temperature stage refrigeration circuit 22; the high-temperature stage heating circuit 21 is used to heat the distillation device 1; the low-temperature stage refrigeration circuit 22 is equipped with a direct-cooling heat exchanger 223, through which the alcoholic beverage steam pipeline 11 flows and exchanges heat with the low-temperature stage refrigeration circuit 22, so as to... Suitable for cooling alcohol vapor in alcohol vapor pipeline 11; heat exchange occurs between high-temperature stage heating circuit 21 and low-temperature stage refrigeration circuit 22 via a first heat exchanger 23, with a first valve body 212 on the high-temperature stage heating circuit 21 and a second valve body 222 on the low-temperature stage refrigeration circuit 22; a monitoring module is located on the low-temperature stage refrigeration circuit 22 to detect the low-temperature stage refrigerant return gas temperature parameter and evaporation pressure parameter; a control module is communicatively connected to the monitoring module, and the control module is suitable for receiving the refrigerant return gas temperature parameter and evaporation pressure parameter to control the opening degree of the first valve body 212 and the second valve body 222 in real time.

[0021] Specifically, this utility model provides a direct-cooling cascade heat pump distillation system for alcohol vapor. By setting up a cascade heat pump device 2, a high-temperature heating circuit 21 heats the distillation device 1, while a low-temperature cooling circuit 22 exchanges heat with the alcohol vapor in the alcohol vapor pipeline 11 through a direct-cooling heat exchanger 223, thereby achieving direct cooling of the alcohol vapor. By employing the cascade heat pump device 2, heat recovery and transfer are achieved through the heat gradient difference between the high and low temperature stages, effectively improving the overall energy efficiency of the heat pump system and overcoming the serious problem of heat energy waste in traditional distillation systems. A monitoring module located on the low-temperature stage circuit collects real-time refrigerant return gas temperature and evaporation pressure parameters, and the control module dynamically adjusts the first valve body 212 and the second valve body 222, thereby precisely controlling the heat exchange conditions during the condensation process and improving the control accuracy of the condensation temperature. Because the alcohol vapor condensation process is controlled and the temperature is precise, insufficient condensation or over-cooling caused by condensation temperature fluctuations is avoided, thus effectively improving the taste and quality stability of the distilled product. This invention constructs a direct-cooling cascade heat pump distillation system for alcohol vapor, which improves energy efficiency and enhances the precision of alcohol vapor condensation control, significantly improving the quality of the finished distilled spirit. It has high practical value and promising prospects for promotion.

[0022] In some embodiments of this utility model, the monitoring module includes a return gas temperature sensor and a low-pressure sensor, both of which are communicatively connected to the control module. The return gas temperature sensor is located on the outlet side of the direct-cooling heat exchanger 223 to detect the return gas temperature parameter of the low-temperature stage refrigerant. The low-pressure sensor is located on the low-pressure main pipeline of the low-temperature stage refrigeration circuit 22 to detect the low-temperature stage evaporation pressure parameter.

[0023] Specifically, the return gas temperature sensor is located at the outlet side of the direct-cooling heat exchanger 223, which can accurately reflect the temperature state of the low-temperature refrigerant after heat exchange with the alcohol vapor in real time. The low-pressure sensor is located on the low-pressure main pipeline, which helps to monitor the operating pressure of the evaporator in a timely manner, thereby comprehensively understanding the evaporation status of the low-temperature refrigerant. Both the return gas temperature sensor and the low-pressure sensor are communicatively connected to the control module, forming a closed-loop feedback control system. This allows the control module to dynamically adjust the opening of the first valve body 212 and the second valve body 222 based on the real-time acquired return gas temperature and evaporation pressure parameters, thereby improving the regulation sensitivity and stability of the entire system.

[0024] By accurately monitoring key operating parameters and providing real-time feedback and adjustment, precise control of the condensation temperature and rate of alcohol vapor can be achieved, avoiding insufficient condensation or overcooling caused by temperature deviations or pressure fluctuations, thereby improving the consistency and quality stability of distilled products.

[0025] In some embodiments of this utility model, the monitoring module further includes a refrigerant leakage sensor that is communicatively connected to the control module. The refrigerant leakage sensor is located inside the direct-cooling heat exchanger 223 and is used to detect refrigerant leakage signals and feed them back to the control module.

[0026] Specifically, by adding a refrigerant leak sensor inside the direct-cooling heat exchanger 223 and connecting it to the control module for real-time detection of refrigerant leak signals, the system's safety and operational reliability are further enhanced. The refrigerant leak sensor can promptly detect potential refrigerant leaks within the direct-cooling heat exchanger 223, preventing system malfunctions and reduced cooling capacity due to insufficient or leaking refrigerant, effectively ensuring long-term stable system operation.

[0027] Understandably, refrigerant leakage can reduce the efficiency of alcohol vapor cooling, affecting the accuracy of condensation temperature control and consequently impacting the quality of distilled products. Real-time monitoring of refrigerant leakage helps maintain the stability of the condensation process while preventing refrigerant from contaminating the workshop environment or the alcohol itself, thus meeting the requirements of green and safe production.

[0028] In some embodiments of this utility model, an alarm module is also included. The alarm module is communicatively connected to the control module, which is adapted to receive refrigerant leakage signals and control the activation or deactivation of the alarm module.

[0029] Specifically, by setting up an alarm module, when the refrigerant leak sensor detects a leak signal and feeds it back to the control module, the alarm module can be quickly activated to promptly issue audible and visual alarm signals, reminding operators to immediately handle the abnormal situation and significantly improving the safety response speed of the system operation.

[0030] In some embodiments of this utility model, the outlet end of the distillation device 1 is provided with a third valve body 13. The outlet of the distillation device 1 is connected to the alcohol vapor pipeline 11 through the third valve body 13. The third valve body 13 is communicatively connected to the control module. The control module can control the opening and closing of the third valve body 13 according to the received refrigerant leakage signal.

[0031] Specifically, when a refrigerant leak occurs in the system, the control module can control the third valve 13 to close based on the leak signal, cutting off the output path of the alcohol vapor at the source and preventing vapor from continuing to enter the cooling system. This effectively avoids secondary failures or safety hazards that may be caused by the system continuing to operate under leak conditions. The third valve 13 enables the refrigerant leak signal to be linked to control the distillation process, effectively forming a safety control closed loop and enhancing the overall linkage response efficiency and control accuracy of the system.

[0032] In some embodiments of this utility model, the control module is provided with an antifreeze protection unit and a safety logic judgment unit. The antifreeze protection unit stores an antifreeze temperature threshold. The control module is adapted to convert the low-temperature evaporation pressure parameter into an evaporation temperature parameter. When the evaporation temperature is lower than the antifreeze temperature threshold, the antifreeze protection unit controls the reduction of the opening of the second valve body 222. If the evaporation temperature remains below the antifreeze temperature threshold within a preset time, the antifreeze protection unit outputs a freezing risk signal to the safety logic judgment unit.

[0033] Specifically, the control module is adapted to convert the low-temperature evaporation pressure parameters into evaporation temperature parameters. The anti-freeze protection unit compares the evaporation temperature with the set anti-freeze temperature threshold. Before the temperature approaches the freezing point, it actively adjusts the opening of the second valve 222 to reduce the system's cooling output, effectively preventing the heat exchanger or pipelines from freezing and causing blockage or rupture. When the evaporation temperature remains below the anti-freeze temperature threshold for a set time, the system will automatically determine that there is a potential freezing risk, and the anti-freeze protection unit will send a freezing risk signal to the safety logic judgment unit, improving the system's safety prediction capability.

[0034] By pre-adjusting at the initial stage of freezing risk and triggering alarms or shutdowns when the risk intensifies, the system can effectively prevent sudden freezing from causing abnormal shutdowns or equipment failures, thus ensuring the stability and continuity of the entire distillation process.

[0035] It can be understood that converting the evaporation pressure parameter into evaporation temperature in real time, dynamically comparing it with a set threshold, and combining with the time window judgment mechanism enables the control strategy to have higher flexibility and robustness, and can adapt to thermal changes under different working conditions. When the evaporation temperature is abnormal, the anti-freezing control strategy timely reduces the opening of the second valve body 222, reduces the refrigeration intensity from the source, prevents frost and ice formation inside the heat exchanger, and prolongs the service life of the direct-cooling heat exchanger 223 and the related refrigerant pipelines.

[0036] In some embodiments of the present utility model, a leakage protection unit is arranged in the control module, and the leakage protection unit is configured to output a leakage risk signal to the safety logic judgment unit when receiving a refrigerant leakage detection signal; the safety logic judgment unit is adapted to receive the freezing risk signal and / or the leakage risk signal, so as to control the third valve body 13, the cascade heat pump device 2 and the alarm module in real time.

[0037] Specifically, the safety logic judgment unit can receive the freezing risk signal and the leakage risk signal at the same time, comprehensively judge the current operation safety level according to different risk states, and then perform accurate and timely linkage control on the third valve body 13, the cascade heat pump device 2 and the alarm module, so as to improve the overall risk resistance and response efficiency of the system. By integrating the two functional units of leakage protection and freezing protection in the control module, an integrated safety control chain is formed, which realizes the whole-process safety protection from accident early warning to emergency treatment, and greatly reduces the problems of equipment damage or product quality degradation caused by abnormal conditions during operation.

[0038] It can be understood that when it is judged that a high-risk state exists, the system can automatically close the third valve body 13 to stop the output of wine steam, and at the same time, can perform linkage shutdown or load limiting control on the cascade heat pump device 2, and synchronously start the alarm module, so as to realize rapid isolation and system protection under high-risk working conditions. In some embodiments of the present utility model, the safety logic judgment unit adopts a fuzzy adaptive anti-windup PID algorithm.

[0039] In some embodiments of the present utility model, the high-temperature stage heating circuit 21 includes a first compressor 211, the wine distillation device 1 is provided with a condenser 12, the refrigerant in the high-temperature stage heating circuit 21 flows out from the outlet of the first compressor 211, exchanges heat in the condenser 12, flows through the first valve body 212, exchanges heat with the refrigerant in the low-temperature stage refrigeration circuit 22 in the first heat exchanger 23, and then returns to the first compressor 211; The low-temperature stage refrigeration circuit 22 includes a second compressor 221, the refrigerant in the low-temperature stage refrigeration circuit 22 flows out from the outlet of the second compressor 221, exchanges heat with wine steam in the direct-cooling heat exchanger 223, flows through the second valve body 222, exchanges heat with the refrigerant in the high-temperature stage heating circuit 21 in the first heat exchanger 23, and then returns to the second compressor 221.

[0040] Specifically, the high-temperature heating circuit 21 and the low-temperature refrigeration circuit 22 are each equipped with independent compressors, and the heat coupling between the two stages of refrigerant is achieved through the first heat exchanger 23. This allows the system to fully utilize the heat energy output from the compressor and the cold energy from the low temperature, maximizing the heat pump efficiency and improving the overall energy utilization efficiency. After being compressed by the first compressor 211, the high-temperature refrigerant first efficiently heats the distillation device 1 through the condenser 12, and then undergoes a secondary heat exchange with the low-temperature refrigerant. This dual-stage heat exchange design allows for precise control of the temperature curve during the heating process of the distillation device 1, making the distillation heating process more stable and efficient. After being compressed by the second compressor 221, the low-temperature refrigerant directly enters the direct-cooling heat exchanger 223 to exchange heat with the alcohol vapor. Then, it recovers the waste heat of the high-temperature refrigerant through the first heat exchanger 23, achieving rapid condensation and temperature control of the alcohol vapor, improving condensation accuracy and response speed, and ensuring distillation quality.

[0041] Two-stage compressors share the load in different temperature zones, which helps to reduce the working pressure and heat load of a single compressor, extend the service life of the equipment, reduce the failure rate, and improve the stability of system operation.

[0042] In some embodiments of this utility model, a heat exchange heating circuit 3 is also included. The heat exchange heating circuit 3 includes a hot water storage tank 31 and a second heat exchanger 32. Hot water flows through the hot water storage tank 31 and through the condenser 12 to exchange heat with the refrigerant in the high-temperature heating circuit 21. The heated hot water achieves flash evaporation of the wine in the wine distillation device 1. The hot water flows through the second heat exchanger 32 and exchanges heat with the domestic water pipeline in the second heat exchanger 32 before flowing back into the hot water storage tank 31.

[0043] Specifically, the heat released by the high-temperature refrigerant in the condenser 12 is recovered through hot water circulation and used to heat the water in the hot water storage tank 31. This water then serves as a heat source for flash distillation of the liquor in the distillation unit 1, effectively reducing energy waste and improving the system's thermal efficiency. The heated hot water is not only used in the distillation process but can also exchange heat with the domestic water supply in the second heat exchanger 32, replenishing the domestic hot water system with waste heat from production, improving the overall energy system efficiency, and promoting green and low-carbon production.

[0044] In some embodiments of this utility model, the monitoring module further includes a temperature sensor installed on the high-temperature stage heating circuit 21 or the heat exchange heating circuit 3. The temperature sensor is used to detect the high-temperature stage outlet water temperature so that the control module can perform heat matching and protection control.

[0045] Specifically, by monitoring the high-temperature stage outlet water temperature in real time, the control module can determine the current system's heat output status and dynamically adjust the first valve 212 or other control parameters to achieve precise matching between heat output and the distillation process load, thereby improving heat energy utilization. When an abnormal increase in the high-temperature stage outlet water temperature is detected, the control module can promptly take adjustment, load limiting, or alarm measures to prevent pipeline expansion, equipment damage, or safety accidents caused by overheating, effectively improving the safety and reliability of system operation.

[0046] By monitoring and controlling the hot water temperature in a closed loop, the heat source supplied by the heat exchange heating loop 3 to the distillation device 1 is kept constant and stable. This helps to control the temperature rise rate and flash evaporation conditions during the distillation process, thereby improving the flavor consistency and production repeatability of the distilled spirit.

[0047] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A direct-cooling cascade heat pump distillation system for alcoholic beverages, characterized in that, include: The distillation device (1) has its outlet connected to the alcohol vapor pipeline (11) for generating alcohol vapor and outputting it to the alcohol vapor pipeline (11). The cascade heat pump device (2) includes a high-temperature stage heating circuit (21) and a low-temperature stage refrigeration circuit (22); the high-temperature stage heating circuit (21) is used to heat the distillation device (1); the low-temperature stage refrigeration circuit (22) is provided with a direct-cooling heat exchanger (223), and the wine vapor pipeline (11) flows through the direct-cooling heat exchanger (223) to exchange heat with the low-temperature stage refrigeration circuit (22) to cool the wine vapor in the wine vapor pipeline (11); the high-temperature stage heating circuit (21) and the low-temperature stage refrigeration circuit (22) exchange heat through a first heat exchanger (23), the high-temperature stage heating circuit (21) is provided with a first valve body (212), and the low-temperature stage refrigeration circuit (22) is provided with a second valve body (222). The monitoring module is located on the low-temperature stage refrigeration circuit (22) to detect the low-temperature stage refrigerant return gas temperature parameters and evaporation pressure parameters; The control module is communicatively connected to the monitoring module. The control module is adapted to receive the refrigerant return gas temperature parameter and the evaporation pressure parameter, so as to control the opening degree of the first valve body (212) and the second valve body (222) in real time.

2. The direct-cooling cascade heat pump distillation system for alcoholic beverages according to claim 1, characterized in that, The monitoring module includes a return gas temperature sensor and a low-pressure sensor, both of which are communicatively connected to the control module. The return gas temperature sensor is located on the outlet side of the direct-cooling heat exchanger (223) to detect the return gas temperature parameter of the low-temperature refrigerant. The low-pressure sensor is located on the low-pressure main pipeline of the low-temperature refrigeration circuit (22) to detect the low-temperature evaporation pressure parameter.

3. The direct-cooling cascade heat pump distillation system for alcoholic beverages according to claim 2, characterized in that, The monitoring module also includes a refrigerant leakage sensor that is communicatively connected to the control module. The refrigerant leakage sensor is located inside the direct-cooling heat exchanger (223) and is used to detect refrigerant leakage signals and feed them back to the control module.

4. The direct-cooling cascade heat pump distillation system for alcoholic beverages according to claim 3, characterized in that, It also includes an alarm module, which is communicatively connected to the control module. The control module is adapted to receive the refrigerant leak signal and control the activation or deactivation of the alarm module.

5. The direct-cooling cascade heat pump distillation system for alcoholic beverages according to claim 4, characterized in that, The outlet of the distillation device (1) is provided with a third valve body (13). The outlet of the distillation device (1) is connected to the wine steam pipeline (11) through the third valve body (13). The third valve body (13) is communicatively connected to the control module. The control module can control the opening and closing of the third valve body (13) according to the received refrigerant leakage signal.

6. The direct-cooling cascade heat pump distillation system for alcoholic beverages according to claim 5, characterized in that, The control module is equipped with an antifreeze protection unit and a safety logic judgment unit. The antifreeze protection unit stores an antifreeze temperature threshold. The control module is adapted to convert the low-temperature evaporation pressure parameter into an evaporation temperature parameter. When the evaporation temperature is lower than the antifreeze temperature threshold, the antifreeze protection unit controls to reduce the opening of the second valve body (222). If the evaporation temperature remains below the antifreeze temperature threshold within a preset time, the antifreeze protection unit outputs a freezing risk signal to the safety logic judgment unit.

7. The direct-cooling cascade heat pump distillation system for alcoholic beverages according to claim 6, characterized in that, The control module is equipped with a leakage protection unit, which is used to output a leakage risk signal to the safety logic judgment unit when the refrigerant leakage detection signal is received; the safety logic judgment unit is adapted to receive the freezing risk signal and / or leakage risk signal to control the third valve body (13), the cascade heat pump device (2) and the alarm module in real time.

8. The direct-cooling cascade heat pump distillation system for alcoholic beverages according to claim 1, characterized in that, The high-temperature heating circuit (21) includes a first compressor (211). The distillation device (1) is equipped with a condenser (12). The refrigerant of the high-temperature heating circuit (21) flows out through the outlet of the first compressor (211), exchanges heat in the condenser (12), flows through the first valve body (212), exchanges heat with the refrigerant of the low-temperature refrigeration circuit (22) in the first heat exchanger (23), and then flows back to the first compressor (211). The low-temperature stage refrigeration circuit (22) includes a second compressor (221). The refrigerant of the low-temperature stage refrigeration circuit (22) flows out through the outlet of the second compressor (221), exchanges heat with the alcohol vapor in the direct-cooling heat exchanger (223), flows through the second valve body (222), exchanges heat with the refrigerant of the high-temperature stage heating circuit (21) in the first heat exchanger (23), and then flows back to the second compressor (221).

9. The direct-cooling cascade heat pump distillation system for alcoholic beverages according to claim 8, characterized in that, It also includes a heat exchange heating circuit (3), which includes a hot water storage tank (31) and a second heat exchanger (32). Hot water flows through the hot water storage tank (31) and through the condenser (12) to exchange heat with the refrigerant in the high-temperature heating circuit (21). The heated hot water is used to heat and flash evaporate the wine in the wine distillation device (1). The hot water flows through the second heat exchanger (32) and exchanges heat with the domestic water pipeline in the second heat exchanger (32) before flowing back into the hot water storage tank (31).

10. The direct-cooling cascade heat pump distillation system for alcoholic beverages according to claim 9, characterized in that, The monitoring module also includes a temperature sensor installed on the high-temperature stage heating circuit (21) or the heat exchange heating circuit (3). The temperature sensor is used to detect the high-temperature stage outlet water temperature so that the control module can perform heat matching and protection control.

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