Wheat energy recycling system and method based on wort cooling and brewing multi-grade water

Abstract

The invention provides a heat energy recycling system and method based on wort cooling and brewing multi-grade water, belongs to the field of brewing energy conservation, and can solve the problems of waste of condensation heat in a refrigeration process and unreasonable brewing water temperature in an existing wort cooling process. The system comprises a heat energy recovery assembly and a brewing water preparation assembly, the heat energy recovery assembly comprises a first heat exchanger, a heat storage water tank and a plurality of heat pumps, and the brewing water preparation assembly comprises a second heat exchanger, a plurality of brewing water tanks and a mixed water tank. According to the device, the temperature requirement for wort cooling in the production process can be fully met, heat released in the wort cooling process and condensation heat in the chilled water preparation process can be fully utilized, brewing multi-grade water is prepared, cyclic utilization of heat energy is achieved, and the device is efficient, energy-saving, low-carbon and environment-friendly.

Description

Technical Field

[0001] This invention belongs to the field of brewing energy conservation technology, and in particular relates to a heat energy recovery and utilization system and method based on wort cooling, as well as brewing multi-grade water. Background Technology

[0002] Beer is a low-alcohol beverage rich in carbon dioxide, brewed primarily from barley malt, hops, and water through yeast fermentation. The beer production process can be broadly divided into malt processing, brewing, and bottling. Energy consumption in beer production is mainly concentrated in the use of heat, electricity, and water. With the rapid development of the beer brewing market, energy consumption in the production process is increasing, placing higher demands on energy optimization. The wort cooling process, a crucial step in beer brewing, is receiving increasing attention due to its energy consumption. Existing wort cooling processes often use chilled water prepared by refrigeration units to cool the wort, using the heated chilled water as brewing water. However, this method leads to wasted condensation heat and inappropriate brewing water temperatures. Therefore, how to cool the wort and effectively recover and utilize the heat energy from wort cooling is a pressing technical problem that needs to be solved in this field. Summary of the Invention

[0003] This invention addresses the technical problems of wasted condensation heat during the refrigeration process and unreasonable brewing water temperature in existing wort cooling processes. It proposes a heat energy recovery and utilization system, method, and brewing multi-grade water based on wort cooling. This system can fully utilize the heat released during the wort cooling process and the condensation heat during the freezing water preparation process, and prepare brewing multi-grade water, realizing the recycling of heat energy, high efficiency, energy saving, low carbon and environmental protection.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a heat energy recovery and utilization system based on wort cooling, comprising a heat energy recovery component, including a first heat exchanger and a hot water storage tank, wherein the inlet of the hot water storage tank is connected to the second outlet of the first heat exchanger, the outlet of the hot water storage tank is connected to the second inlet of the first heat exchanger, and multiple heat pumps are connected in parallel between the first heat exchanger and the hot water storage tank; a brewing water preparation component, comprising a second heat exchanger, multiple brewing water tanks and a mixing water tank connected in sequence, wherein the first inlet of the second heat exchanger is connected to the first outlet of the first heat exchanger, the second inlet of the second heat exchanger is connected to the outlet of the heat pump, the second outlet of the second heat exchanger is connected to the inlet of the brewing water tank, the inlet of the mixing water tank is connected to the outlet of the brewing water tank, and the outlet of the mixing water tank is connected to the inlet of the heat pump.

[0005] In some embodiments, the heat pump includes a first heat pump, the first inlet of which is connected to the outlet of the hot water storage tank via a third two-way valve, and the first outlet of which is connected to the first outlet of the first heat exchanger; and a second heat pump, the first inlet of which is connected to the outlet of the hot water storage tank via a second two-way valve, the first outlet of which is connected to the inlet of the hot water storage tank, and the second outlet of which is connected to the second inlet of the first heat pump.

[0006] In some embodiments, the brewing tank includes a first brewing tank, the inlet of which is connected to the second outlet of the second heat exchanger via a first three-way valve, and the outlet of the first brewing tank is the brewing water outlet; and a second brewing tank, the inlet of which is connected to the second outlet of the second heat exchanger via a first three-way valve.

[0007] In some embodiments, the brewing water preparation assembly further includes an ambient temperature water tank, with a second water pump installed at the inlet of the ambient temperature water tank, and the other end of the second water pump connected to a first two-way valve; the outlet of the ambient temperature water tank is connected to the inlet of the mixing water tank.

[0008] In some embodiments, a first water pump is provided at the first inlet of the first heat exchanger, a fourth two-way valve is provided at the second inlet of the first heat exchanger, and a fourth inlet pump is provided at the outlet of the hot water storage tank.

[0009] Another aspect of the present invention provides a method for recovering and utilizing heat energy based on wort cooling, which utilizes a heat energy recovery and utilization system based on wort cooling to absorb, store and utilize the heat energy released during the wort cooling process, including a wort cooling step and a heat energy recovery and utilization step.

[0010] In some embodiments, the wort cooling step specifically includes the following steps: The high-temperature wort enters the first heat exchanger by the first water pump, and the water in the hot water storage tank enters the first heat exchanger by the fourth water pump. After absorbing some of the heat from the wort, the water is heated and flows out from the second outlet of the first heat exchanger back into the hot water storage tank, completing the first cooling of the wort. The partially cooled wort flows out from the first outlet of the first heat exchanger into the second heat exchanger. Low-temperature chilled water from the first heat pump enters the second heat exchanger, absorbs heat from the wort, and the water heats up and flows out from the second outlet of the second heat exchanger, completing the second cooling of the wort.

[0011] In some embodiments, the heat energy recovery and utilization step specifically includes the following steps: Adjusting the first three-way valve switches the water flowing out of the second heat exchanger to the first brewing water tank to prepare high-temperature brewing water, or adjusting the first three-way valve switches the water flowing out of the second heat exchanger to the second brewing water tank to prepare medium-temperature brewing water; Adjusting the second three-way valve mixes the water from the second brewing tank and the room temperature water tank into the mixing tank. The mixed water is then pumped by the third water pump into the second heat pump and the first heat pump for staged cooling to produce chilled water. The condensation heat of the mixed water extracted by the second heat pump and the first heat pump is absorbed by the water inlet of the hot water storage tank by controlling the second two-way valve and the third two-way valve, respectively.

[0012] In another aspect, the present invention provides brewing water of various grades, which is prepared by the above-described method for recovering heat energy from wort cooling.

[0013] In some embodiments, the brewing water for multiple grades includes high-temperature brewing water, medium-temperature brewing water, and chilled water, wherein the temperature of the high-temperature brewing water is 80-85°C, the temperature of the medium-temperature brewing water is 65-75°C, and the temperature of the chilled water is 2-4°C.

[0014] Compared with the prior art, the advantages and positive effects of the present invention are as follows: This invention is based on a wort cooling heat energy recovery and utilization system. Through the arrangement of heat energy recovery components and brewing water preparation components, the system can operate stably, fully guarantee the temperature requirements of wort cooling during the production process, and make full use of the heat released during the wort cooling process and the condensation heat during the chilled water preparation process to prepare brewing water of various grades. This realizes the recovery and recycling of heat energy, which is highly efficient, energy-saving, low-carbon and environmentally friendly. In this invention, a heat energy recovery and utilization method based on wort cooling is used to fully utilize the heat released by wort cooling for the preparation of brewing water of various grades. The preparation of brewing water in different temperature zones can be flexibly adjusted according to production needs. In the process of preparing chilled water, the system operates stably, ensuring the required temperature of chilled water and supplying it in a timely manner. Both the chilled water and the condensation heat in the chilled water preparation process can be recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A flowchart of a heat recovery and utilization system based on wort cooling provided in an embodiment of the present invention; In the diagram, 110 is the first heat exchanger, 120 is the hot water storage tank, 131 is the first heat pump, and 132 is the second heat pump. 210. Second heat exchanger; 221. First brewing water tank; 222. Second brewing water tank; 230. Ambient temperature water tank; 240. Mixing water tank; 310, First water pump; 320, Second water pump; 330, Third water pump; 340, Fourth water pump; 410, First two-way valve; 420, Second two-way valve; 430, Third two-way valve; 440, Fourth two-way valve; 510, First three-way valve; 520, Second three-way valve. Detailed Implementation

[0016] To provide a more detailed understanding of the features and technical content of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments of the present invention. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed by the present invention.

[0017] This invention provides a wort cooling-based heat energy recovery and utilization system, method, and brewing multi-grade water. The wort cooling-based heat energy recovery and utilization system operates stably, ensuring the required wort cooling temperature during production and effectively recovering and utilizing heat energy. The wort cooling-based heat energy recovery and utilization method involves two-stage heat recovery, fully utilizing the condensation heat from the preparation of chilled water during wort cooling and the heat released during wort cooling to achieve energy recycling. The system is highly efficient, energy-saving, and low-carbon. Through flexible control and optimization of the energy structure, brewing water at different temperature zones can be prepared according to production needs, resulting in brewing multi-grade water.

[0018] Reference Appendix Figure 1As shown, the present invention's wort cooling-based heat energy recovery and utilization system includes a heat energy recovery component and a brewing water preparation component. The heat energy recovery component is used to recover the heat released during the wort cooling process. The heat energy recovery component includes a first heat exchanger 110, one end of which is connected to a first water pump 310; a hot water storage tank 120, the inlet of which is connected to the second outlet of the first heat exchanger 110, and the outlet of which is connected to the second inlet of the first heat exchanger 110. A fourth water pump 340 is positioned near the hot water storage tank 120 between the outlet of the hot water storage tank 120 and the second inlet of the first heat exchanger 110. A fourth two-way valve 440 is installed; a first heat pump 131, the first inlet of the first heat pump 131 is connected to the outlet of the hot water storage tank 120 through a third two-way valve 430, and the first outlet of the first heat pump 131 is connected to the first outlet of the first heat exchanger 110; a second heat pump 132, the first inlet of the second heat pump 132 is connected to the outlet of the hot water storage tank 120 through a second two-way valve 420, the first outlet of the second heat pump 132 is connected to the inlet of the hot water storage tank 120, and the second outlet of the second heat pump 132 is connected to the second inlet of the first heat pump 131. The first heat pump 131 and the second heat pump 132 are connected in parallel between the first heat exchanger 110 and the hot water storage tank 120. The outlet of the hot water storage tank 120 can be circulated via three lines. In the first line, the outlet of the hot water storage tank 120 is sequentially connected to the fourth water pump 340, the fourth two-way valve 440, and the second inlet of the first heat exchanger 110, before returning to the hot water storage tank 120 via the second outlet of the first heat exchanger 110. In the second line, the outlet of the hot water storage tank 120 is sequentially connected to the fourth water pump 340, the third two-way valve 430, and the first heat pump 131 before returning to the hot water storage tank 120. In the third line, the outlet of the hot water storage tank 120 is sequentially connected to the fourth water pump 340, the second two-way valve 420, and the second heat pump 132 before returning to the hot water storage tank 120. In a preferred embodiment, the first heat exchanger 110 includes one of a plate heat exchanger, a shell-and-tube heat exchanger, a spiral plate heat exchanger, and a coaxial tube heat exchanger. In a preferred embodiment, the first heat pump 131 includes one of a magnetic levitation heat pump, a scroll heat pump, a screw heat pump, and a centrifugal heat pump.

[0019] The brewing water preparation component of the present invention based on the heat energy recovery and utilization system of wort cooling includes a second heat exchanger 210, the first inlet of the second heat exchanger 210 being connected to the first outlet of the first heat exchanger 110, the first outlet of the second heat exchanger 210 being the outlet of the cooled wort, and the second inlet of the second heat exchanger 210 being connected to the second outlet of the first heat pump 131; a first brewing water tank 221, the inlet of the first brewing water tank 221 being connected to the second outlet of the second heat exchanger 210 through a first three-way valve 510, and the outlet of the first brewing water tank 221 being the outlet of the brewing water; and a second brewing water tank 222, the first... The inlet of the brewing water tank 222 is connected to the second outlet of the second heat exchanger 210 via a first three-way valve 510. The ambient temperature water tank 230 has its inlet connected to a second water pump 320, and the other end of the second water pump 320 is connected to ambient temperature water via a first two-way valve 410. The outlet of the ambient temperature water tank 230 is connected to the outlet of the second brewing water tank 222 via a second three-way valve 520. The mixing water tank 240 has its outlet connected to the second inlet of the second heat pump 132 via a third water pump 330. The inlet of the mixing water tank 240 is connected to the outlet of the ambient temperature water tank 230. In a preferred embodiment, the second heat exchanger 210 includes one of a plate heat exchanger, a shell-and-tube heat exchanger, a spiral plate heat exchanger, or a coaxial tube heat exchanger. In a preferred embodiment, the second heat pump 132 includes one of a magnetic levitation heat pump, a scroll heat pump, a screw heat pump, and a centrifugal heat pump.

[0020] In a preferred embodiment, the hot water storage tank 120, the first brewing water tank 221, the second brewing water tank 222, the ambient temperature water tank 230, and the mixing water tank 240 all include one of the following: vertical hot water storage tank, horizontal hot water storage tank, and stratified hot water storage tank.

[0021] In a preferred embodiment, the first water pump 310, the second water pump 320, the third water pump 330, and the fourth water pump 340 each include one of a centrifugal water pump, a positive displacement water pump, and an axial flow water pump.

[0022] In a preferred embodiment, the first two-way valve 410, the second two-way valve 420, the third two-way valve 430, and the fourth two-way valve 440 each include one of a manual two-way valve, an electric two-way valve, and a pneumatic two-way valve.

[0023] In a preferred embodiment, both the first three-way valve 510 and the second three-way valve 520 include one of a manual three-way valve, an electric three-way valve, and a pneumatic three-way valve.

[0024] In this invention, the heat energy recovery and utilization method based on wort cooling involves the high-temperature wort sequentially flowing through a first heat exchanger 110 and a second heat exchanger 210 to complete the wort cooling process, thus achieving heat energy recovery and utilization in two stages. Specifically, the method includes the following steps: High-temperature wort enters the first heat exchanger 110 via the first water pump 310. Water in the hot water storage tank 120 enters the first heat exchanger 110 via the fourth water pump 340. After absorbing some of the heat from the wort, the water heats up and flows out from the second outlet of the first heat exchanger 110 back into the hot water storage tank 120, thus achieving the first cooling of the wort and completing the first stage of heat recovery. The cooled wort flows out from the first outlet of the first heat exchanger 110 and into the second heat exchanger 210. The low-temperature chilled water in the first heat pump 131 enters the second heat exchanger 210, absorbs heat from the wort, and the water is heated and flows out from the second outlet of the second heat exchanger 210, thus achieving a second cooling of the wort. The low-temperature chilled water in the first heat pump 131 is obtained by the mixed water in the mixing tank 240 being cooled in stages by passing through the second heat pump 132 and the first heat pump 131 in sequence. Adjusting the first three-way valve 510 switches the water flowing out of the second heat exchanger 210 to the first brewing water tank 221 to prepare high-temperature brewing water, or adjusting the first three-way valve 510 switches the water flowing out of the second heat exchanger 210 to the second brewing water tank 222 to prepare medium-temperature brewing water. Adjusting the second three-way valve 520 mixes the water in the second brewing water tank 222 and the room temperature water tank 230 into the mixing water tank 240. The mixed water is then pumped by the third water pump 330 into the second heat pump 132 and the first heat pump 131 for staged cooling to produce chilled water. In the above process, the water consumption is replenished by the linkage control of the second water pump 320 and the two-way valve. By controlling the second two-way valve 420 and the third two-way valve 430, the condensation heat extracted by the second heat pump 132 and the first heat pump 131 is absorbed by the water inlet of the hot water storage tank 120, completing the second stage of heat energy recovery.

[0025] During the second cooling of the wort, the opening degree of the fourth two-way valve 440 is controlled to adjust the ratio of heat released from the high-temperature wort in the first heat exchanger 110 and the second heat exchanger 210. When the opening degree of the fourth two-way valve 440 is small, the heat released by the wort during the first cooling in the first heat exchanger 110 decreases, and the heat released during the second cooling in the second heat exchanger 210 increases accordingly. At this time, the first three-way valve 510 is adjusted to switch to the first brewing water tank 221, and the low-temperature chilled water from the first heat pump 131 absorbs heat and then enters the first brewing water tank 221. High-temperature brewing water is prepared in the first brewing water tank 221 and used for equipment washing and lees washing. Conversely, when the opening of the fourth two-way valve 440 is large, the heat released by the wort during the first cooling in the first heat exchanger 110 increases, and the heat released during the second cooling in the second heat exchanger 210 decreases accordingly. At this time, by adjusting the first three-way valve 510, the process switches to the second brewing water tank 222. The low-temperature chilled water from the first heat pump 131 absorbs heat and enters the second brewing water tank 222 to prepare medium-temperature brewing water, which is used for feeding and blending.

[0026] The above-described heat recovery and utilization method based on wort cooling of the present invention, and the heat recovery and utilization system based on wort cooling, wherein the wort passes through two heat exchangers in stages to complete the wort cooling process. In the first heat exchanger 110, the heat released by the wort is partially recovered by the water in the hot water storage tank 120. After the heat released by the wort in the second heat exchanger 210 is absorbed by the chilled water, part of the chilled water enters the corresponding brewing water tank to complete the corresponding brewing water preparation according to production needs. The mixed water in the mixing water tank 240 is used to complete the chilled water preparation via a heat pump. The water in the hot water storage tank 120 is used to complete the remaining heat recovery process via a heat pump. The heat released in the wort cooling process can be effectively recovered and utilized.

[0027] This invention also provides multi-grade brewing water, prepared using the aforementioned method for recovering heat energy from wort cooling. The multi-grade brewing water of this invention includes high-temperature brewing water, medium-temperature brewing water, and chilled water. The high-temperature brewing water has a temperature of 80-85°C and can be used for equipment washing and lees washing; the medium-temperature brewing water has a temperature of 65-75°C and can be used for ingredient blending; the chilled water has a temperature of 2-4°C and is used for secondary cooling of the wort before recycling.

[0028] To provide a clearer and more detailed description of the wort cooling-based heat recovery and utilization system, method, and brewing multi-grade water provided in the embodiments of the present invention, the following description will be based on specific embodiments.

[0029] Example 1 This embodiment is based on a method for recovering and utilizing heat energy from wort cooling, specifically including the following steps: The wort at around 98°C enters the first heat exchanger 110 via the first water pump 310. Water at around 70°C enters the first heat exchanger 110 via the fourth water pump 340. After absorbing some of the heat from the wort, the water is heated to around 90°C and flows out from the second outlet of the first heat exchanger 110 back into the hot water storage tank 120, thus achieving the first cooling of the wort and completing the first stage of heat recovery. The cooled wort flows out from the first outlet of the first heat exchanger 110 and into the second heat exchanger 210. Low-temperature chilled water at about 4°C in the first heat pump 131 enters the second heat exchanger 210, absorbs heat from the wort, heats up the water and flows out from the second outlet of the second heat exchanger 210, and cools the wort to about 7°C, thus achieving the cooling process of the remaining wort. By controlling the fourth two-way valve 440, the heat released by the wort in the first heat exchanger 110 and the second heat exchanger 210 is changed, so that the brewing water preparation process can be flexibly adapted to the temperature requirements of production: when the opening of the fourth two-way valve 440 is small, the heat released by the wort during the first cooling in the first heat exchanger 110 is reduced. The wort at about 98°C is cooled to about 88°C after passing through the first heat exchanger 110. The heat released by the wort during the second cooling in the second heat exchanger 210 is increased. The first three-way valve 510 is adjusted to switch to the first brewing water tank 221, so that the chilled water at about 4°C from the first heat pump 131 absorbs heat and enters the first brewing water tank 221, thus preparing high-temperature brewing water at about 80°C, which is used for equipment washing and lees washing. When the opening of the fourth two-way valve 440 is large, the heat released by the wort during the first cooling in the first heat exchanger 110 increases. The wort at around 98°C is cooled to around 78°C after passing through the first heat exchanger 110. The heat released by the wort during the second cooling in the second heat exchanger 210 decreases. The first three-way valve 510 is adjusted to switch to the first brewing water tank 221, so that the chilled water at around 4°C from the first heat pump 131 absorbs heat and enters the first brewing water tank 221 to prepare medium-temperature brewing water at around 70°C, which is used for feeding and blending. The amount of water consumed by the brewing water prepared by the first brewing water tank 221 and the second brewing water tank 222 for production is supplemented to the ambient temperature water tank 230 with ambient temperature water by adjusting the first two-way valve 410 and controlling the second water pump 320. By adjusting the second three-way valve 520, the second brewing water tank 222 can be used in two ways: firstly, in the production process; and secondly, to be mixed with water from the ambient temperature water tank 230 and stored in the mixing water tank 240 as raw material for chilled water. The chilled water raw material in the mixing water tank 240 enters the second heat pump 132 through the third water pump 330 to achieve a first-stage cooling to about 15°C, and then enters the first heat pump 131 to achieve a second-stage cooling to about 4°C, thus completing the chilled water preparation process. At this time, by controlling the fourth water pump 340 and the second two-way valve 420 to pump water from the hot water storage tank 120 at about 70°C, the water absorbs the condensing heat from the second heat pump 132 and is heated to about 85°C. By controlling the fourth water pump 340 and the third two-way valve 430 to pump water from the hot water storage tank 120 at about 70°C, the water absorbs the condensing heat from the first heat pump 131 and is heated to about 85°C, thus completing the second part of the heat energy recovery process.

[0030] Finally, it should be noted that the present invention is not limited to the embodiments listed above. The above description is only a preferred and feasible embodiment of the present invention, and the above-described embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, all modifications, alterations, and improvements made by those skilled in the art to the technical solution of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A heat energy recovery and utilization system based on wort cooling, characterized in that, include The heat recovery component includes a first heat exchanger and a hot water storage tank. The inlet of the hot water storage tank is connected to the second outlet of the first heat exchanger, and the outlet of the hot water storage tank is connected to the second inlet of the first heat exchanger. Multiple heat pumps are connected in parallel between the first heat exchanger and the hot water storage tank. The brewing water preparation assembly includes a second heat exchanger, multiple brewing water tanks, and a mixing water tank connected in sequence. The first inlet of the second heat exchanger is connected to the first outlet of the first heat exchanger, the second inlet of the second heat exchanger is connected to the outlet of the heat pump, the second outlet of the second heat exchanger is connected to the inlet of the brewing water tanks, the inlet of the mixing water tank is connected to the outlet of the brewing water tanks, and the outlet of the mixing water tank is connected to the inlet of the heat pump.

2. The heat energy recovery and utilization system based on wort cooling according to claim 1, characterized in that, The heat pump includes a first heat pump, whose first inlet is connected to the outlet of the hot water storage tank via a third two-way valve, and whose first outlet is connected to the first outlet of the first heat exchanger; and a second heat pump, whose first inlet is connected to the outlet of the hot water storage tank via a second two-way valve, whose first outlet is connected to the inlet of the hot water storage tank, and whose second outlet is connected to the second inlet of the first heat pump.

3. The heat energy recovery and utilization system based on wort cooling according to claim 1, characterized in that, The brewing water tank includes a first brewing water tank, the inlet of which is connected to the second outlet of the second heat exchanger via a first three-way valve, and the outlet of the first brewing water tank is the brewing water outlet; and a second brewing water tank, the inlet of which is connected to the second outlet of the second heat exchanger via a first three-way valve.

4. The heat energy recovery and utilization system based on wort cooling according to claim 1, characterized in that, The brewing water preparation assembly also includes an ambient temperature water tank, with a second water pump installed at the inlet of the ambient temperature water tank, and the other end of the second water pump connected to a first two-way valve; the outlet of the ambient temperature water tank is connected to the inlet of the mixing water tank.

5. The heat energy recovery and utilization system based on wort cooling according to claim 1, characterized in that, A first water pump is installed at the first inlet of the first heat exchanger, a fourth two-way valve is installed at the second inlet of the first heat exchanger, and a fourth inlet pump is installed at the outlet of the hot water storage tank.

6. A method for recovering and utilizing heat energy based on wort cooling, characterized in that, A heat recovery and utilization system based on wort cooling is used to absorb, store, and utilize the heat energy released during the wort cooling process, including the wort cooling step and the heat recovery and utilization step.

7. The method for heat energy recovery and utilization based on wort cooling according to claim 6, characterized in that, The wort cooling process specifically includes the following steps: The high-temperature wort enters the first heat exchanger by the first water pump, and the water in the hot water storage tank enters the first heat exchanger by the fourth water pump. After absorbing some of the heat from the wort, the water is heated and flows out from the second outlet of the first heat exchanger back into the hot water storage tank, completing the first cooling of the wort. The cooled wort flows out from the first outlet of the first heat exchanger and into the second heat exchanger. Low-temperature chilled water from the first heat pump enters the second heat exchanger, absorbs heat from the wort, and the water heats up and flows out from the second outlet of the second heat exchanger, completing the second cooling of the wort.

8. The method for heat energy recovery and utilization based on wort cooling according to claim 6, characterized in that, The heat energy recovery and utilization process specifically includes the following steps: Adjusting the first three-way valve switches the water flowing out of the second heat exchanger to the first brewing water tank to prepare high-temperature brewing water, or adjusting the first three-way valve switches the water flowing out of the second heat exchanger to the second brewing water tank to prepare medium-temperature brewing water; Adjusting the second three-way valve mixes the water from the second brewing tank and the room temperature water tank into the mixing tank. The mixed water is then pumped by the third water pump into the second heat pump and the first heat pump for staged cooling to produce chilled water. The condensation heat of the mixed water extracted by the second heat pump and the first heat pump is absorbed by the water inlet of the hot water storage tank by controlling the second two-way valve and the third two-way valve, respectively.

9. Water for brewing multiple grades, characterized in that, It is prepared by the heat energy recovery and utilization method based on wort cooling as described in any one of claims 6-8.

10. The brewing multi-grade water according to claim 8, characterized in that, The water used for brewing includes high-temperature brewing water, medium-temperature brewing water, and chilled water. The temperature of high-temperature brewing water is 80-85℃, the temperature of medium-temperature brewing water is 65-75℃, and the temperature of chilled water is 2-4℃.

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