Baijiu ice tank water comprehensive utilization water-saving system and control method

Abstract

The application discloses a liquor ice tank water comprehensive utilization water-saving system and a control method, which comprises a waste heat utilization refrigerating unit, an ice tank, an air cooler, dry-wet combined air cooling, a cooling water inlet and an outlet of the waste heat utilization refrigerating unit and the dry-wet combined air cooling form a circulating water cooling loop; an ice tank water circulation loop is formed between the ice tank and the waste heat utilization refrigerating unit, and the ice tank water circulation loop is as follows: the high-temperature water outlet end of the ice tank is connected to the heat source end of the waste heat utilization refrigerating unit for primary cooling; the generator of the waste heat utilization refrigerating unit flows out and enters the air cooler for secondary cooling, and the water flowing out of the air cooler is cooled for the third time by the cold source of the waste heat utilization refrigerating unit; and finally, the water enters the low-temperature inlet end of the ice tank; a middle cooling circulation loop is formed between the air cooler and the waste heat utilization refrigerating unit. The air cooler is used for cooling the secondary high-temperature water by ambient air, the water in the branch is cooled without water consumption, and the water is not evaporated, discharged or floated, so that water consumption is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of waste heat utilization technology, specifically to a water-saving system for the comprehensive utilization of water from a liquor ice tank. Background Technology

[0002] The brewing of baijiu (Chinese white liquor) involves fermentation and distillation. After fermentation in the cellars, the yeast starter has a low alcohol concentration and requires further distillation and condensation to obtain baijiu with a higher alcohol content. The traditional condensation process involves the vapor from the distillation vessel entering a condenser where it exchanges heat with water in an ice tank to cool and condense the vapor into liquid. The condenser uses process cooling water for primary cooling, collecting the condensed liquid. This process cooling water, once heated, cannot be reused in the condenser; therefore, there is no water recycling.

[0003] To achieve water conservation and reuse the waste heat of the low-grade circulating water generated after heating in the liquor condenser, existing technology discloses a liquor waste heat utilization system (application number CN202010409815.0). This system includes a liquor condenser, a waste heat utilization chiller, a cooling tower, and a circulating water heat exchanger. A first cooling tower circulation loop is established between the cooling water inlet and outlet of the waste heat utilization chiller and the cooling tower. A second cooling tower circulation loop is established between the cooling tower and the circulating water heat exchanger. A liquor vapor cooling circulation loop is also provided on the liquor condenser. This existing process effectively recovers and utilizes the heat source of the circulating ice tank water in the low-grade liquor condenser. However, its drawback is that both the first and second cooling tower circulation loops use wet cooling towers to cool the circulating water. The wet cooling tower relies on spray water to cover the heat exchanger to form a water film, forming heat exchange and carrying away heat. In actual use, the evaporation of spray water and the water loss caused by the circulating wind of the fan result in a high overall water consumption. Taking the ice tank water circulating in the wine condenser as 100t / h, the temperature is 85℃ to 20℃, and calculated based on 270 days of operation per year: (1) If tap water is selected for cooling and then discharged directly, the water consumption is: 648,000 tons / year. (2) As described in the aforementioned patent, a refrigeration unit is used, equipped with a wet cooling tower. Its main water consumption is the wet cooling tower, with an average annual water replenishment of about 11.37t / h and a total water consumption of 73,700 tons / year. Furthermore, the cooling effect of the first and second cooling tower circulation loops on the circulating water in this technology is greatly affected by fluctuations in outdoor temperature, which can easily lead to fluctuations in the cooling temperature of the ice tank circulating water by the waste heat utilization chiller.

[0004] It is evident that direct discharge results in the highest water consumption; even using the aforementioned patented technology, the annual water consumption is still considerable, and the residual heat utilization process still needs optimization. Therefore, it is necessary to propose a comprehensive water-saving system for the utilization of water from liquor ice tanks to address these issues. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned technical problems by providing a water-saving system and control method for comprehensive utilization of water from liquor ice tanks.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a water-saving system for comprehensive utilization of water from a liquor ice tank, comprising a waste heat utilization refrigeration unit, an ice tank, an air cooler, and a combined dry and wet air cooler. A circulating water cooling loop is formed between the cooling water inlet and outlet of the waste heat utilization refrigeration unit and the combined dry and wet air cooler. An ice tank water circulation loop is formed between the ice tank and the waste heat utilization refrigeration unit. The ice tank water circulation loop proceeds as follows: the high-temperature water from the high-temperature outlet of the ice tank is connected to the heat source of the waste heat utilization refrigeration unit for primary cooling, serving as the driving heat source for the refrigeration unit; the water flows out from the generator of the waste heat utilization refrigeration unit and enters the air cooler for secondary cooling; after flowing out from the air cooler, it is cooled a third time using the cold source of the waste heat utilization refrigeration unit; finally, it enters the low-temperature inlet of the ice tank. A medium-cooling circulation loop is formed between the air cooler and the waste heat utilization refrigeration unit.

[0007] Furthermore, the waste heat utilization refrigeration unit includes an evaporator, an absorber, a generator, and a condenser; the high-temperature water outlet of the ice cylinder is connected to the inlet of the generator;

[0008] The intercooling circulation loop connects the generator outlet to the air cooler inlet, and the air cooler outlet to the evaporator inlet; the evaporator outlet is connected to the ice cylinder low-temperature inlet.

[0009] The circulating water cooling circuit connects the inlet of the absorber and condenser to the low-temperature outlet of the dry-wet combined air cooler, and the outlet of the absorber and condenser is connected to the high-temperature inlet of the dry-wet combined air cooler.

[0010] Furthermore, the low-temperature ice tank water at the outlet of the evaporator is also equipped with a temperature control branch circuit. The temperature control heat exchanger on the temperature control branch circuit serves as a cold source to perform secondary cooling on the low-temperature outlet water that combines dry and wet cooling. The end of the temperature control branch circuit is connected to the inlet of the evaporator.

[0011] Furthermore, the waste heat utilization refrigeration unit includes an evaporator, an absorber, a generator, and a condenser; the high-temperature water outlet of the ice cylinder is connected to the inlet of the generator;

[0012] The evaporator is connected to a closed refrigerant circulation loop. Low-temperature refrigerant flows out from the evaporator outlet and connects to a refrigerant heat exchanger as a cold source. The outlet of the refrigerant heat exchanger is connected to the evaporator inlet.

[0013] The intermediate cooling circulation loop connects the generator outlet to the air cooler inlet, and the air cooler outlet to the refrigerant heat exchanger inlet; the refrigerant heat exchanger outlet is connected to the ice cylinder low-temperature inlet.

[0014] The circulating water cooling circuit connects the inlet of the absorber and condenser to the low-temperature outlet of the dry-wet combined air cooler, and the outlet of the absorber and condenser is connected to the high-temperature inlet of the dry-wet combined air cooler.

[0015] Furthermore, the refrigerant circulation loop is also provided with a temperature control branch loop. The temperature control heat exchanger on the temperature control branch loop serves as a cold source to perform secondary cooling on the low-temperature outlet water of the dry-wet combined air-cooled system. The end of the temperature control branch loop is connected to the inlet end of the evaporator.

[0016] Furthermore, the waste heat utilization refrigeration unit is a lithium bromide absorption chiller.

[0017] A control method for a water-saving system for comprehensive utilization of water from a liquor ice tank, wherein the high-temperature outlet temperature of the ice tank is 60-95℃; the circulating water at 60-95℃ serves as the driving heat source for the waste heat utilization refrigeration unit, and its temperature after exiting the generator is 55-90℃; the circulating water at 55-90℃ is cooled to 20-45℃ by an air cooler; and the low-temperature inlet temperature of the ice tank is 16-25℃.

[0018] Furthermore, the circulating water temperature at the outlet of the absorber and condenser is 38-42℃, and the temperature of the 38-42℃ circulating water after being cooled by a combination of dry and wet air cooling is 28-32℃.

[0019] Furthermore, the water temperature at the upper end of the refrigerant circulation loop is 16-30℃, and the water temperature at the lower end of the refrigerant circulation loop is 18-38℃.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: the high-temperature water flowing out of the ice tank is used as the driving heat source of the waste heat utilization refrigeration unit. After the driving heat source is cooled multiple times by the waste heat refrigeration unit, the water in the ice tank is reduced to 16-30°C. The combination of dry and wet air cooling and the use of air coolers greatly reduces the evaporation loss of spray water during the circulating water cooling process. The air cooler is used to directly cool the secondary high-temperature water (temperature 55-65°C) of the waste heat refrigeration unit generator with ambient air. This part no longer uses wet cooling, realizing zero water consumption for water cooling in this branch, that is, no evaporation, no sewage discharge and no drift water, ensuring a 100% water saving rate for this section. Furthermore, the refrigerant of the waste heat recovery chiller is equipped with a temperature control branch circuit. Through this circuit, the temperature of the circulating water in the circulating water cooling circuit can be controlled more precisely, making the circuit less affected by weather temperature changes. This, in turn, makes the amount of condensate in the absorber and condenser of the waste heat recovery chiller stable during operation, and makes it easier to adjust the liquid holding capacity in each container of the waste heat recovery chiller, thereby making the operating temperature of the waste heat recovery chiller more stable. Attached Figure Description

[0021] Figure 1 This is one of the process diagrams of the water-saving system for comprehensive utilization of water from the liquor ice tank of the present invention;

[0022] Figure 2 This is one of the schematic diagrams showing the connection relationship between the waste heat utilization refrigeration unit and the external heat exchanger of the present invention;

[0023] Figure 3 This is the second schematic diagram showing the connection relationship between the waste heat utilization refrigeration unit and the external heat exchanger of the present invention;

[0024] Figure 4 This is the third schematic diagram showing the connection relationship between the waste heat utilization refrigeration unit and the external heat exchanger of the present invention;

[0025] Figure 5 This is the fourth schematic diagram showing the connection relationship between the waste heat utilization refrigeration unit and the external heat exchanger of the present invention;

[0026] Figure 6 This is the second schematic diagram of the water-saving system for comprehensive utilization of water from the ice tank of liquor according to the present invention; Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0028] Example 1:

[0029] A water-saving system for comprehensive utilization of water from liquor ice tanks, such as Figure 1As shown, it includes a waste heat recovery refrigeration unit, which is a lithium bromide absorption chiller. The waste heat recovery refrigeration unit includes an evaporator, an absorber, a generator, and a condenser;

[0030] It also includes ice tanks, air coolers, and a combined wet and dry air cooler. Distilled spirit vapor is sent to the ice tank for condensation, producing spirit. In practice, multiple ice tanks can be arranged side-by-side. Each ice tank contains water for condensation and has a high-temperature outlet and a low-temperature inlet. The water continuously circulates within the ice tank. The waste heat recovery refrigeration unit utilizes the waste heat from the low-grade ice tank water at the high-temperature outlet as its driving heat source. The high-temperature outlet temperature of the ice tank is 60-95℃. In practice, a hot water tank for water storage and a hot water pump for pumping the high-temperature ice tank water into the preheating refrigeration unit can also be installed at the high-temperature outlet. Figure 6 As shown;

[0031] The waste heat utilization refrigeration unit forms a circulating water cooling loop between its cooling water inlet and outlet and the dry-wet combined air cooler; such as Figure 2 As shown, specifically, the main outlet pipe of the dry-wet combined air cooler in the circulating cooling loop is connected to the inlet of the condenser and absorber respectively. The temperature of the circulating water after being cooled by the dry-wet combined air cooler is 28-32℃. The circulating water at the outlet of the condenser and absorber flows back and is connected to the inlet of the dry-wet combined air cooler to exchange heat with the condenser and absorber of the waste heat utilization refrigeration unit. The circulating water temperature at the outlet of the absorber and condenser is 38-42℃, allowing the circulating water to circulate continuously. Choosing a dry-wet combined air cooler can maximize water saving and achieve water mist-free operation throughout the year. The water saving rate, depending on the dry cooling point, can reach 20-80% compared to conventional wet cooling towers. For example, considering only winter defogging operation, the water saving rate is about 20%. If the dry cooling point is designed at 20℃, the annual water saving rate can be about 80%, which greatly reduces water consumption compared to wet cooling towers.

[0032] A water circulation loop is formed between the ice tank and the waste heat recovery refrigeration unit. The loop's flow is as follows: the high-temperature water outlet of the ice tank connects to the heat source of the waste heat recovery refrigeration unit for primary cooling. This high-temperature water serves as the driving heat source for the unit. Specifically, the high-temperature water outlet of the ice tank connects to the inlet of the generator, allowing the ice tank water to enter the heat exchange ring within the generator for primary cooling. The temperature of the high-temperature ice tank water exiting the generator is 55-90℃. The water then flows out of the generator of the waste heat recovery refrigeration unit and enters the air cooler for secondary cooling. The temperature after secondary cooling in the air cooler is 20-45℃. Finally, the water flows out of the air cooler and is cooled a third time using the cold source of the waste heat recovery refrigeration unit. Figure 2As shown, in this embodiment, the water in the ice tank directly enters the heat exchange tubes inside the evaporator for three cooling cycles; finally, it flows back into the low-temperature inlet of the ice tank. After three cooling cycles by the waste heat utilization refrigeration unit, the low-temperature inlet water temperature of the ice tank is 16-30℃. In actual use, a cold water tank for water storage can be installed on the low-temperature inlet water pipeline of the ice tank, and the ice tank water is pumped into the ice tank by a cold water pump. An intercooling circulation loop is formed between the air cooler and the waste heat utilization refrigeration unit. The intercooling circulation loop connects the generator outlet to the air cooler inlet, and the air cooler outlet to the evaporator inlet. The evaporator outlet is connected to the low-temperature inlet of the ice tank.

[0033] The ice tank water circulation loop is a fully enclosed pipeline that circulates water and only exchanges temperature with the external environment. As a closed loop, it is not contaminated by external debris and can maintain the cleanliness of the ice tank circulating water for a long time. Moreover, there is no need to add purification agents regularly. Compared with wet cooling towers, this process can reduce cooling water vapor loss by more than 70%.

[0034] Example 2:

[0035] The waste heat utilization refrigeration unit forms a circulating water cooling loop between its cooling water inlet and outlet and the dry-wet combined air cooler; such as Figure 3 As shown, specifically, the main outlet pipe of the dry-wet combined air cooler in the circulating cooling loop is connected to the inlet of the condenser and absorber respectively. The temperature of the circulating water after being cooled by the dry-wet combined air cooler is 28-32℃. The circulating water at the outlet of the condenser and absorber flows back and is connected to the inlet of the dry-wet combined air cooler to exchange heat with the condenser and absorber of the waste heat utilization refrigeration unit. The circulating water temperature at the outlet of the absorber and condenser is 38-42℃, allowing the circulating water to circulate continuously. Choosing a dry-wet combined air cooler can maximize water saving and achieve water mist-free operation throughout the year. The water saving rate, depending on the dry cooling point, can reach 20-80% compared to conventional wet cooling towers. For example, considering only winter defogging operation, the water saving rate is about 20%. If the dry cooling point is designed at 20℃, the annual water saving rate can be about 80%, which greatly reduces water consumption compared to wet cooling towers.

[0036] The ice tank and the waste heat recovery refrigeration unit form an ice tank water circulation loop. The ice tank water circulation loop proceeds as follows: the high-temperature water outlet of the ice tank connects to the heat source of the waste heat recovery refrigeration unit for primary cooling. This high-temperature water serves as the driving heat source for the waste heat recovery refrigeration unit. Specifically, the high-temperature water outlet of the ice tank connects to the inlet of the generator, allowing the ice tank water to enter the heat exchange ring within the generator for primary cooling. The temperature of the high-temperature ice tank water exiting the generator is 55-90℃. The water then flows out of the generator of the waste heat recovery refrigeration unit and enters the air cooler for secondary cooling. The temperature after secondary cooling in the air cooler is 20-45℃. An intermediate cooling circulation loop is formed between the air cooler and the waste heat recovery refrigeration unit. The water flowing out of the air cooler then undergoes a tertiary cooling process using the cold source of the waste heat recovery refrigeration unit. Figure 3 As shown, in this embodiment, the water in the ice tank directly enters the heat exchange tube in the evaporator for three cooling cycles; finally, it flows back into the low-temperature inlet of the ice tank. After being cooled three times by the waste heat utilization refrigeration unit, the low-temperature inlet water temperature of the ice tank is 16-30℃.

[0037] like Figure 3 As shown, the cold source of the waste heat recovery refrigeration unit can also be utilized. A branch of the cold source can be established to regulate the temperature of the outlet water from the combined wet and dry air cooling system. In this embodiment, the cold source of the waste heat recovery refrigeration unit is the ice tank water itself. A branch is formed by separating the low-temperature inlet water from the evaporator to create a temperature-controlled branch loop. Specifically, the low-temperature cold source from the evaporator enters the temperature-controlled heat exchanger to perform secondary cooling of the low-temperature outlet water from the combined wet and dry air cooling system. The end of the temperature-controlled branch loop is connected to the evaporator inlet for recirculation. This allows for more precise temperature control of the circulating water in the circulating water cooling loop. It is understood that an automatic regulating valve should be installed on the temperature-controlled branch loop to control the amount of cold source used. Adjusting the temperature of the condenser and absorber makes it easier to regulate the liquid holding layer within the waste heat recovery refrigeration unit, thereby making the unit's operation more stable.

[0038] Example 3:

[0039] The waste heat utilization refrigeration unit forms a circulating water cooling loop between its cooling water inlet and outlet and the dry-wet combined air cooler; such as Figure 4As shown, specifically, the main outlet pipe of the dry-wet combined air cooler in the circulating cooling loop is connected to the inlet of the condenser and absorber respectively. The temperature of the circulating water after being cooled by the dry-wet combined air cooler is 28-32℃. The circulating water at the outlet of the condenser and absorber flows back and is connected to the inlet of the dry-wet combined air cooler to exchange heat with the condenser and absorber of the waste heat utilization refrigeration unit. The circulating water temperature at the outlet of the absorber and condenser is 38-42℃, allowing the circulating water to circulate continuously. Choosing a dry-wet combined air cooler can maximize water saving and achieve water mist-free operation throughout the year. The water saving rate, depending on the dry cooling point, can reach 20-80% compared to conventional wet cooling towers. For example, considering only winter defogging operation, the water saving rate is about 20%. If the dry cooling point is designed at 20℃, the annual water saving rate can be about 80%, which greatly reduces water consumption compared to wet cooling towers.

[0040] A water circulation loop is formed between the ice tank and the waste heat recovery refrigeration unit. The loop's flow is as follows: the high-temperature water outlet of the ice tank connects to the heat source of the waste heat recovery refrigeration unit for primary cooling. This high-temperature water serves as the driving heat source for the unit. Specifically, the high-temperature water outlet of the ice tank connects to the inlet of the generator, allowing the ice tank water to enter the heat exchange ring within the generator for primary cooling. The temperature of the high-temperature ice tank water exiting the generator is 55-90℃. The water then flows out of the generator of the waste heat recovery refrigeration unit and enters the air cooler for secondary cooling. The temperature after secondary cooling in the air cooler is 20-45℃. Figure 4 As shown, the air flows out of the air cooler and then uses the waste heat to cool the refrigeration unit three times.

[0041] In this embodiment, the evaporator is connected to a closed refrigerant circulation loop. The low-temperature refrigerant flowing out of the evaporator outlet connects to a refrigerant heat exchanger as a cold source. The outlet of the refrigerant heat exchanger connects to the inlet of the evaporator to form a refrigerant circulation flow. It is understood that a pump should be installed on this refrigerant circulation loop to provide power for the refrigerant circulation flow, or a refrigerant storage tank can be installed to facilitate flow regulation and control and stable circulation. The refrigerant uses the refrigerant heat exchanger to cool the ice tank water three times. Then it flows back into the low-temperature inlet of the ice tank. After being cooled three times by the refrigeration unit using waste heat, the low-temperature inlet water temperature of the ice tank is 16-30℃. In this embodiment, the refrigerant passing through the evaporator is in a closed loop, and the ice tank water is cooled three times by the refrigerant.

[0042] Example 4:

[0043] The waste heat utilization refrigeration unit forms a circulating water cooling loop between its cooling water inlet and outlet and the dry-wet combined air cooler; such as Figure 5As shown, specifically, the main outlet pipe of the dry-wet combined air cooler in the circulating cooling loop is connected to the inlet of the condenser and absorber respectively. The temperature of the circulating water after being cooled by the dry-wet combined air cooler is 28-32℃. The circulating water at the outlet of the condenser and absorber flows back and is connected to the inlet of the dry-wet combined air cooler to exchange heat with the condenser and absorber of the waste heat utilization refrigeration unit. The circulating water temperature at the outlet of the absorber and condenser is 38-42℃, allowing the circulating water to circulate continuously. Choosing a dry-wet combined air cooler can maximize water saving and achieve water mist-free operation throughout the year. The water saving rate, depending on the dry cooling point, can reach 20-80% compared to conventional wet cooling towers. For example, considering only winter defogging operation, the water saving rate is about 20%. If the dry cooling point is designed at 20℃, the annual water saving rate can be about 80%, which greatly reduces water consumption compared to wet cooling towers.

[0044] The ice tank and the waste heat utilization refrigeration unit form an ice tank water circulation loop. The ice tank water circulation loop is as follows: the high-temperature water outlet of the ice tank is connected to the heat source of the waste heat utilization refrigeration unit for primary cooling. This high-temperature water outlet serves as the driving heat source for the waste heat utilization refrigeration unit. Specifically, the high-temperature water outlet of the ice tank is connected to the inlet of the generator, allowing the ice tank water to enter the heat exchange ring inside the generator for primary cooling. The temperature of the high-temperature ice tank water after exiting the generator is 55-90℃. It then flows out of the generator of the waste heat utilization refrigeration unit and enters the air cooler for secondary cooling. The temperature after secondary cooling in the air cooler is 20-45℃. After exiting the air cooler, it is then cooled a third time using the cold source of the waste heat utilization refrigeration unit.

[0045] In this embodiment, as Figure 5 As shown, the evaporator is connected to a closed refrigerant circulation loop. The refrigerant circulation loop starts from the outlet of the evaporator and connects to a refrigerant heat exchanger as a cold source. The outlet of the refrigerant heat exchanger is connected to the inlet of the evaporator to form a refrigerant circulation flow. The refrigerant uses the refrigerant heat exchanger to cool the ice tank water three times. Then it flows back into the low-temperature inlet of the ice tank. After being cooled three times by the refrigeration unit using waste heat, the low-temperature inlet water temperature of the ice tank is 16-30℃. In this embodiment, the refrigerant passing through the evaporator is in a closed loop. The refrigerant cools the ice tank water three times. It can be understood that the power of the refrigerant circulation loop can be provided by a water pump to promote its circulation, or a liquid storage tank can be set in the loop to stabilize the circulation.

[0046] As an improvement to Embodiment 3, waste heat can also be utilized as the cold source of the refrigeration unit, and the cold source can be branched to regulate the temperature of the outlet water from the combined dry and wet air cooling system; specifically, for example... Figure 5As shown, the refrigerant circulation loop also includes a temperature-controlled branch loop. A branch pipe branches off from the evaporator outlet, and the low-temperature outlet water from the combined dry and wet air cooling system is cooled a second time via a temperature-controlled heat exchanger on the branch loop. The end of the temperature-controlled branch loop connects to the evaporator inlet, thus forming a branch circulation of the refrigerant. The water temperature at the top of the refrigerant circulation loop is 16-30℃, and the return water temperature is 18-38℃. It is understood that an automatic regulating valve should be installed on the temperature-controlled branch loop to control the amount of cold source used. Adjusting the temperature of the condenser and absorber makes it easier to regulate the liquid holding layer within the waste heat recovery refrigeration unit, thereby making the operation of the waste heat recovery refrigeration unit more stable.

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A water-saving system for comprehensive utilization of water from a liquor ice tank, comprising a waste heat utilization refrigeration unit, characterized in that, It also includes an ice tank, an air cooler, and a combined wet and dry air cooler. A circulating water cooling loop is formed between the cooling water inlet and outlet of the waste heat recovery refrigeration unit and the combined wet and dry air cooler. An ice tank water circulation loop is formed between the ice tank and the waste heat recovery refrigeration unit. The ice tank water circulation loop proceeds as follows: the high-temperature water from the high-temperature outlet of the ice tank is connected to the heat source of the waste heat recovery refrigeration unit for primary cooling; this high-temperature water serves as the driving heat source for the waste heat recovery refrigeration unit; the water flows out from the generator of the waste heat recovery refrigeration unit and enters the air cooler for secondary cooling; the water then flows out from the air cooler and is cooled a third time using the cold source of the waste heat recovery refrigeration unit; finally, it enters the low-temperature inlet of the ice tank. An intermediate cooling loop is formed between the air cooler and the waste heat recovery refrigeration unit. The waste heat utilization refrigeration unit includes an evaporator, an absorber, a generator, and a condenser; the high-temperature water outlet of the ice cylinder is connected to the inlet of the generator; The intercooling circulation loop connects the generator outlet to the air cooler inlet, and the air cooler outlet to the evaporator inlet; the evaporator outlet is connected to the ice cylinder low-temperature inlet. The circulating water cooling circuit is such that the inlet of the absorber and condenser is connected to the low-temperature outlet of the dry-wet combined air cooler, and the outlet of the absorber and condenser is connected to the high-temperature inlet of the dry-wet combined air cooler. The low-temperature ice tank water at the outlet of the evaporator is also equipped with a temperature control branch circuit. The temperature control heat exchanger on the temperature control branch circuit serves as a cold source to perform secondary cooling on the low-temperature outlet water that is combined with dry and wet air cooling. The end of the temperature control branch circuit is connected to the inlet of the evaporator.

2. The water-saving system for comprehensive utilization of water from a liquor ice tank according to claim 1, characterized in that, The waste heat utilization refrigeration unit is a lithium bromide absorption chiller.

3. The control method for a water-saving system for comprehensive utilization of water from a liquor ice tank according to claim 1, characterized in that, The high-temperature outlet temperature of the ice tank is 60-95℃; the circulating water at 60-95℃, which serves as the driving heat source for the waste heat utilization refrigeration unit, has a temperature of 55-90℃ after exiting the generator; the circulating water at 55-90℃ has a temperature of 20-45℃ after being cooled by the air cooler; and the low-temperature inlet temperature of the ice tank is 16-25℃.

4. The control method for a water-saving system for comprehensive utilization of water in a liquor ice tank according to claim 3, characterized in that, The circulating water temperature at the outlet of the absorber and condenser is 38-42℃, and the temperature of the 38-42℃ circulating water is 28-32℃ after being cooled by a combination of dry and wet air cooling.

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