Beer industry heat energy center based on multi-grade waste heat recovery

Abstract

The beer industry heat energy center based on multi-grade waste heat recovery comprises a waste heat recovery unit, a water ring network, a heat pump upgrading unit and an energy storage center, the waste heat recovery unit comprises a plurality of first heat exchangers, and the first heat exchangers are arranged on different waste heat sources so as to be suitable for collecting waste heat; the water ring network is connected with the multiple first heat exchangers, circulating water is arranged in the water ring network, and the circulating water is suitable for heat exchange and temperature rise in the first heat exchangers and is suitable for transferring heat energy; the heat pump upgrading unit comprises a waste heat side and a heat supply side, and the waste heat side is connected with the water ring network to be suitable for absorbing heat energy of circulating water; the heat pump upgrading unit is suitable for upgrading the absorbed heat energy; the energy storage center is connected with the heat supply side through a first heat storage pipeline, a circulating medium is arranged in the first heat storage pipeline, and the circulating medium absorbs the upgraded heat energy on the heat supply side and transmits the heat energy to the energy storage center; the energy storage center is suitable for storing heat energy and supplying heat to the outside. Integrated recovery of multi-source waste heat can be achieved, cost optimization is achieved, and stable heat supply is achieved.

Description

Technical Field

[0001] This invention relates to the field of thermal energy utilization in the beer industry, and in particular to a thermal energy center for the beer industry based on multi-grade waste heat recovery. Background Technology

[0002] In the beer production process, bottle washing and sterilization in the packaging workshop, temperature maintenance in the fermentation workshop, and heating in the workshop during winter all consume a significant amount of heat energy. Traditional heat supply methods primarily rely on waste heat recovery from the saccharification workshop, supplemented by steam heating. However, this direct heat exchange waste heat recovery model has extremely limited potential; each heat-requiring stage still consumes a large amount of primary energy, resulting in low energy utilization efficiency. Simultaneously, breweries generate a large amount of low-grade waste heat during production, including boiler flue gas waste heat, condensation heat from the ammonia refrigeration system in the cold storage station, and waste heat from brewing and packaging wastewater. Previously, most of this waste heat was directly lost without effective recovery and utilization, resulting in substantial energy waste.

[0003] In related technologies, heat pump technology is used to recover the aforementioned waste heat and produce high-temperature hot water to replace traditional steam or high-temperature hot water heating. However, the currently widely used decentralized heat pump system with single-point recovery mode has many drawbacks. Under this mode, if the number of heat pump deployment points is small, the amount of waste heat recovered is insufficient to meet the demand, resulting in poor energy-saving effects. If there are too many deployment points, a series of problems will arise: First, multiple heat pump units occupy a large amount of space, resulting in high equipment redundancy and low actual equipment utilization; second, investment costs increase significantly, and subsequent maintenance and management costs are high; third, it is difficult to effectively coordinate the peak and valley periods of various waste heat resources, resulting in poor waste heat coupling, and when the waste heat at a certain waste heat emission point fluctuates, the system's heating stability is severely affected; fourth, as energy-saving efforts in breweries continue to advance, the heat output of equipment such as boilers and chillers gradually decreases, further deteriorating the return on investment of decentralized heat pump systems and making it difficult to guarantee economic benefits. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of this invention is to propose a heat energy center for the beer industry based on multi-grade waste heat recovery, aiming to solve the technical problems of insufficient stability and economy in the decentralized recovery of waste heat.

[0005] This invention proposes a beer industry thermal energy center based on multi-grade waste heat recovery. The beer industry thermal energy center includes a waste heat recovery unit, a water loop network, a heat pump upgrading unit, and an energy storage center. The waste heat recovery unit includes multiple first heat exchangers, which are respectively set at different waste heat sources to collect waste heat. The water loop network connects the multiple first heat exchangers and contains circulating water suitable for heat exchange and temperature rise in the first heat exchangers and for transferring heat energy. The heat pump upgrading unit includes a waste heat side and a heating side. The waste heat side is connected to the water loop network to absorb the heat energy of the circulating water and is suitable for upgrading the absorbed heat energy. The energy storage center is connected to the heating side through a first heat storage pipeline containing a circulating medium. The circulating medium absorbs the upgraded heat energy on the heating side and transfers it to the energy storage center. The energy storage center is suitable for storing heat energy and supplying heat to the outside.

[0006] According to the beer industry thermal energy center of the present invention, by setting up multiple first heat exchangers, multi-source and multi-grade waste heat can be recovered and utilized, and the organic integration of multi-source waste heat is achieved through a water ring network, maximizing the recovery of waste heat. Multiple heat exchangers are connected to a highly integrated heat pump upgrading unit through the water ring network. Compared with decentralized heat pump systems, this significantly reduces equipment redundancy, improves equipment utilization, effectively reduces investment costs, and saves a large amount of plant space, greatly reducing floor space and initial investment costs. The present invention achieves multi-source and multi-grade waste heat recovery through system integration, which can significantly optimize costs and achieve stable heating.

[0007] According to some embodiments of the present invention, the water ring network includes a main water supply line and a main water return line; wherein each first heat exchanger is connected to a water supply branch and a water return branch, the water supply branch is connected to the main water supply line, and the water return branch is connected to the main water return line, so as to be suitable for multiple first heat exchangers to be connected in parallel; or multiple first heat exchangers to be connected in series between the main water supply line and the main water return line.

[0008] According to some embodiments of the present invention, the water ring network is provided with at least one water pump and at least one regulating valve, wherein the water pump is used to regulate the water pressure of the circulating water and the regulating valve is adapted to control the flow rate of the circulating water.

[0009] According to some embodiments of the present invention, the thermal energy center of the beer industry further includes an intelligent control unit, which includes at least one temperature sensor and at least one flow sensor. The intelligent control unit is adapted to control the operation of water pumps, regulating valves and heat pump upgrading units based on the detection results of the temperature sensor and the flow sensor, so as to adjust the heating supply.

[0010] According to some embodiments of the present invention, the waste heat recovery unit further includes a PVT unit, which is connected to a water loop network or an energy storage center, and the PVT unit is adapted to collect solar radiation heat to supplement the heating supply.

[0011] According to some embodiments of the present invention, a PVT unit includes a photovoltaic thermal module, a second heat exchanger, and a heat pump system. The photovoltaic thermal module is adapted to convert solar radiation energy into electrical energy and thermal energy. The second heat exchanger is adapted to absorb the heat energy generated by the photovoltaic thermal module and transfer the heat energy. The heat pump system is connected to the second heat exchanger and is adapted to improve the quality of the heat energy absorbed by the second heat exchanger.

[0012] According to some embodiments of the present invention, the second heat exchanger and the heat pump system are optionally connected to a water loop network or an energy storage center to facilitate the switching of the PVT unit between heat exchanger mode and heat pump mode.

[0013] According to some embodiments of the present invention, the heat pump upgrading unit includes a third heat exchanger and a heat pump unit; the third heat exchanger is connected to a water loop network and an energy storage center to absorb the heat energy of the circulating water and transfer the heat energy to the energy storage center; one side of the heat pump unit is connected to the water loop network to absorb the heat energy of the circulating water; the other side is connected to the energy storage center to transfer the heat energy to the energy storage center; and the heat pump unit is adapted to upgrade the absorbed heat energy.

[0014] According to some embodiments of the present invention, a heat pump unit includes a plurality of heat pumps, each heat pump being selectively turned on or off based on the thermal energy of the circulating water.

[0015] According to some embodiments of the present invention, the plurality of first heat exchangers include a flue water heat exchanger, an ammonia refrigeration condensation heat recovery heat exchanger, and a wastewater heat exchanger; the waste heat recovery unit further includes: a saccharification workshop waste heat recovery heat exchanger, which is connected to a water loop network to provide waste heat to the circulating water; or the saccharification workshop waste heat recovery heat exchanger is connected to an energy storage center through a second heat storage pipeline to transfer heat energy to the energy storage center.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of a thermal energy center for the beer industry according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of a thermal energy center for the beer industry according to Embodiment 2 of the present invention; Figure 3 This is a schematic diagram of the structure of a thermal energy center for the beer industry according to Embodiment 3 of the present invention.

[0018] Figure label: Waste heat recovery unit 10; PVT unit 11; flue water heat exchanger 12; ammonia refrigeration condensing heat recovery heat exchanger 13; sewage heat exchanger 14; waste heat recovery heat exchanger in saccharification workshop 15. Water ring network 20; main water supply line 21; main return water line 22; water supply branch line 23; return water branch line 24; Heat pump upgrading unit 30; third heat exchanger 31; heat pump unit 32; Energy storage center 40; first thermal storage pipeline 50; second thermal storage pipeline 60; heating pipeline 70; water pump 80. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] The following is for reference. Figures 1-3 This invention describes a beer industry thermal energy center based on multi-grade waste heat recovery according to an embodiment of the present invention.

[0021] This invention proposes a beer industry thermal energy center based on multi-grade waste heat recovery. The beer industry thermal energy center includes a waste heat recovery unit 10, a water loop network 20, a heat pump upgrading unit 30, and an energy storage center 40. The waste heat recovery unit 10 includes multiple first heat exchangers, which are respectively set at different waste heat sources to collect waste heat. The water loop network 20 connects the multiple first heat exchangers and contains circulating water suitable for heat exchange and temperature rise in the first heat exchangers and for transferring heat energy. The heat pump upgrading unit 30 includes a waste heat side and a heating side. The waste heat side is connected to the water loop network 20 to absorb the heat energy of the circulating water and is suitable for upgrading the absorbed heat energy. The energy storage center 40 is connected to the heating side through a first heat storage pipeline 50, which contains a circulating medium. The circulating medium absorbs the upgraded heat energy on the heating side and transfers it to the energy storage center 40. The energy storage center 40 is suitable for storing heat energy and supplying heat to the outside.

[0022] According to the beer industry thermal energy center of the present invention, multiple first heat exchangers are arranged at different waste heat sources, enabling the absorption and utilization of waste heat from multiple heat sources. When the circulating water in the water loop network 20 flows through the first heat exchangers, the waste heat from the heat sources is transferred to the circulating water via the first heat exchangers. After the circulating water is heated by heat exchange, it flows through the heat pump upgrading unit 30, transferring heat energy to the heat pump upgrading unit 30. The heat pump upgrading unit 30 can upgrade the heat energy, extracting and upgrading the low-grade heat energy from the low-temperature heat source into high-temperature heat energy. Furthermore, a circulating medium for heat exchange is provided in the first heat storage pipeline 50. The heat energy upgraded by the heat pump upgrading unit 30 is transferred to the circulating medium, and further transferred to the energy storage center 40. The energy storage center 40 absorbs and stores the heat energy and is suitable for supplying heat to heat-using units such as heat-using workshops. The waste heat recovery unit 10 can be expanded by adding heat exchangers to more waste heat sources.

[0023] According to the beer industry thermal energy center of the present invention, by setting up multiple first heat exchangers, multi-source and multi-grade waste heat can be recovered and utilized, and the organic integration of multi-source waste heat is achieved with the help of water ring network 20, maximizing the recovery of waste heat. Multiple heat exchangers are connected to a highly integrated heat pump upgrading unit 30 through water ring network 20. Compared with decentralized heat pump systems, this significantly reduces equipment redundancy, improves equipment utilization, effectively reduces investment costs, and saves a large amount of plant space, greatly reducing the footprint and initial investment cost. The present invention achieves multi-source and multi-grade waste heat recovery through system integration, which can significantly optimize costs and achieve stable heating.

[0024] In some embodiments, the energy storage center 40 is connected to a heating pipeline 70 to provide heat to units such as heat-consuming workshops. A circulating medium is provided in the heating pipeline 70, which absorbs heat energy as it flows through the energy storage center 40 and transfers it to the heat-consuming workshops. The circulating medium in both the first heat storage pipeline 50 and the heating pipeline 70 can be configured as circulating water.

[0025] According to some embodiments of the present invention, the water loop network 20 includes a main water supply line 21 and a main water return line 22; wherein each first heat exchanger is connected to a water supply branch line 23 and a water return branch line 24, the water supply branch line 23 is connected to the main water supply line 21, and the water return branch line 24 is connected to the main water return line 22, so as to suit multiple first heat exchangers connected in parallel; or multiple first heat exchangers are connected in series between the main water supply line 21 and the main water return line 22. In this embodiment, the main water supply line 21 and the main water return line 22 form a circulating water main line, and the water supply branch line 23 and the water return branch line 24 connecting any one of the first heat exchangers form a circulating water branch line. Multiple first heat exchangers can be connected in parallel to the main line through independent branch lines; multiple first heat exchangers can also be connected in series between the main water supply line 21 and the main water return line 22. In parallel connection, each first heat exchanger of the waste heat recovery unit 10 can operate independently, fully leveraging their respective waste heat collection advantages. This is suitable for complex operating conditions where waste heat sources are widely distributed and there are significant differences in temperature and flow rate among the heat sources. The flow rate of each branch can be independently controlled, and considering the temperature difference between branches, heat exchange efficiency can be optimized by adjusting the flow rate of each branch. Series connection allows waste heat to be transferred and utilized in a tiered manner among multiple first heat exchangers, improving the overall utilization efficiency of waste heat. This is particularly suitable for scenarios where the waste heat source temperature is relatively high and continuously stable. The connection methods of the first heat exchangers in this embodiment are diverse and can be adjusted and selected according to requirements. Furthermore, multiple first heat exchangers are not limited to a single parallel or series connection; they can also be connected in a combination of series and parallel connections.

[0026] like Figure 1 As shown, in some embodiments, multiple first heat exchangers are connected in parallel. The heat energy from each waste heat source is transferred to the circulating water in each branch pipe through the heat exchanger via a high-temperature medium. The heat energy absorbed by the circulating water in each branch pipe is mixed in the main pipe. The heated circulating water flows through the heat pump upgrading unit 30, which further enhances the heat energy. The heating side of the heat pump upgrading unit 30 sends the upgraded heat energy to the energy storage center 40 through the circulating medium in the first heat storage pipe 50. After heat exchange, the low-temperature circulating medium returns to the heat pump heating side, completing one cycle. In this embodiment, the water loop network 20 connects each first heat exchanger in the waste heat recovery unit 10 in parallel, which can fully utilize the advantages of each first heat exchanger in waste heat collection and adapt to the characteristics of different waste heat sources. According to the waste heat temperature and heat demand, the flow rate of each branch is dynamically adjusted through an intelligent control system to achieve efficient utilization of waste heat.

[0027] In some embodiments, multiple first heat exchangers are connected in series, and the circulating water absorbs waste heat sequentially as it flows through each first heat exchanger, thereby achieving a step-by-step increase in temperature.

[0028] According to some embodiments of the present invention, the water loop network 20 is provided with at least one water pump 80 and at least one regulating valve. The water pump 80 is used to regulate the water pressure of the circulating water, and the regulating valve is adapted to control the flow rate of the circulating water. In this embodiment, by providing the water pump 80, the circulating water can circulate in the water loop network 20 to achieve heat transfer, and by providing the regulating valve, the flow rate of the circulating water can be adjusted, thereby adjusting the heat transfer. Further, in some embodiments, multiple first heat exchangers are connected in parallel, and each branch pipe is provided with a regulating valve to adjust the flow rate of the circulating water in that branch pipe.

[0029] According to some embodiments of the present invention, the beer industry thermal energy center further includes an intelligent control unit. The intelligent control unit includes at least one temperature sensor and at least one flow sensor. The intelligent control unit is adapted to control the operation of the water pump 80, regulating valve, and heat pump upgrading unit 30 based on the detection results of the temperature and flow sensors, thereby adjusting the heating supply. In this embodiment, through temperature and flow monitoring, system operating conditions such as waste heat temperature can be obtained. Based on the detection results and heating demand, the intelligent control unit controls the operation of the water pump 80, regulating valve, and heat pump upgrading unit 30, enabling coordinated adjustments. This allows for automatic adjustment of the heat pump's operating mode and water circulation flow rate, dynamically optimizing the water circulation flow distribution and heat pump operating parameters. This ensures the system can promptly and accurately meet the needs of the heat-consuming workshop, achieving on-demand heating and realizing efficient energy utilization and optimized system operation.

[0030] In some embodiments, each first heat exchanger is equipped with a temperature sensor and a flow sensor to detect the circulating water temperature and flow rate of the corresponding branch pipe, thereby obtaining the waste heat collection status.

[0031] Furthermore, the intelligent control unit integrates control algorithms, which can dynamically adjust the flow rate of each branch pipe using advanced temperature difference control strategies, achieving flexible coupling of waste heat in each part and realizing efficient complementary utilization of different waste heat resources. Simultaneously, based on the real-time temperature of different waste heat sources and changes in dynamic heat demand, the intelligent control unit intelligently adjusts the flow rate and direction of the water circulation and the operating parameters of the heat pump upgrading unit 30, ensuring the system is always in optimal operating condition and effectively improving the system's heating stability and reliability.

[0032] According to some embodiments of the present invention, the waste heat recovery unit 10 further includes a PVT unit 11, which is connected to the water loop network 20 or the energy storage center 40. The PVT unit 11 is adapted to collect solar radiation heat to supplement the heating supply. PVT refers to photovoltaic thermal technology. In this embodiment, by setting up the PVT unit 11, solar energy can be absorbed and utilized to supplement the heating supply, especially to meet the heating demand when the waste heat source is insufficient.

[0033] According to some embodiments of the present invention, the PVT unit 11 includes a photovoltaic thermal module, a second heat exchanger, and a heat pump system. The photovoltaic thermal module is adapted to convert solar radiation energy into electrical energy and heat energy; the second heat exchanger is adapted to absorb and transfer the heat energy generated by the photovoltaic thermal module; the heat pump system is connected to the second heat exchanger and is adapted to improve the quality of the heat energy absorbed by the second heat exchanger. In this embodiment, the photovoltaic thermal module converts solar radiation energy into electrical energy and heat energy, and the electrical energy can be used to power each unit. The second heat exchanger can transfer the absorbed solar radiation heat energy to the circulating water. The heat pump system uses solar radiation heat as a low-grade heat source, which can improve the grade and provide heat to the circulating water.

[0034] Among them, the photovoltaic and solar thermal modules prioritize power supply to the heat pump system, which significantly improves the energy self-sufficiency rate of PVT unit 11 and reduces electricity costs; on the other hand, it provides an effective way to consume photovoltaic power generation locally and improves the comprehensive utilization efficiency of energy.

[0035] In the above embodiments, the PVT unit 11 can be connected to the water loop network 20 or the energy storage center 40 according to the access scale of the waste heat recovery unit 10 and the heat requirements.

[0036] Specifically, in some embodiments, such as Figure 2 As shown, the PVT unit 11 is connected to the water loop network 20. In this embodiment, the PVT unit 11 converts solar energy into electrical and thermal energy; the electrical energy is preferentially used to power the various units of this invention, meeting part of the power demand of the heat pump upgrading unit 30 and other equipment; the thermal energy is transferred to the circulating water. When the circulating water passes through the PVT unit, it absorbs the heat released by it, and its temperature further increases. In this embodiment, since the PVT unit 11 is connected to the waste heat side of the heat pump upgrading unit 30, it can directly utilize the waste heat generated by solar energy, increasing the waste heat recovery of the system. Furthermore, through the intelligent control unit, the flow rate of each branch in the water loop network 20 can be dynamically adjusted according to the power generation and heat production of the PVT unit 11, as well as changes in other waste heat sources, to achieve complementary utilization of multi-source waste heat, improving the energy utilization efficiency and heating stability of the system. The PVT unit 11 can be connected in parallel or in series with each of the first heat exchangers.

[0037] In some embodiments, such as Figure 3As shown, the PVT unit 11 is connected to the energy storage center 40. Waste heat is collected by the waste heat recovery unit 10 and upgraded by the heat pump upgrading unit 30 before being transferred to the circulating medium in the heating pipeline 70. At this time, the PVT unit 11 can further heat or supplement the circulating medium supplied by the energy storage center 40 according to real-time heat demand. In specific applications, when heat demand suddenly increases, the PVT unit 11 starts up, using its own heat pump function and the energy generated by photovoltaic power generation to reheat the circulating medium, ensuring that the heat demand is met. In this embodiment, the PVT unit 11 can more directly heat or supplement the circulating medium according to specific heat demand, enhancing the system's heating flexibility and adaptability. Simultaneously, its photovoltaic power generation can also provide partial power support to the energy storage center 40, reducing the system's energy consumption. Through the intelligent control unit, the operating parameters of the PVT unit 11 can be dynamically adjusted based on the water temperature and flow rate of the circulating medium in the heating pipeline 70 and the feedback information from the heat-using workshop, so as to achieve precise heating and improve energy utilization efficiency.

[0038] In some embodiments, the heat pump system of the PVT unit 11 includes components such as a compressor, evaporator, condenser, and throttling device, which work together to improve thermal quality. In some embodiments, the second heat exchanger is constructed as a microchannel heat exchanger, which has microscale channels that can greatly increase the heat exchange area, enhance the heat transfer process, and ensure that solar radiation heat can be efficiently and stably absorbed by the circulating water to provide the required heat for the system.

[0039] According to some embodiments of the present invention, the second heat exchanger and the heat pump system are selectively connected to the water loop network 20 or the energy storage center 40 to facilitate the switching of the PVT unit 11 between heat exchanger mode and heat pump mode. In this embodiment, the PVT unit operates in two modes: heat exchanger mode and heat pump mode. In heat exchanger mode, the second heat exchanger is directly connected to the water loop network 20 or the energy storage center 40, and the solar radiation heat energy absorbed by the second heat exchanger is directly transferred to the circulating medium in the circulating water or heating pipeline 70, which can provide efficient heating while reducing energy consumption. The heat exchanger mode is particularly suitable for summer conditions. In heat pump mode, the heat pump system is connected to the water loop network 20 or the energy storage center 40, which can improve the quality of the absorbed solar radiation heat energy before transfer, which can significantly improve the heating effect. The heat pump mode is particularly suitable for winter conditions.

[0040] In some embodiments, during summer operation, the intelligent control unit controls the PVT unit 11 to bypass the compressor, enabling the microchannel heat exchanger to operate in direct heat exchange mode. In this mode, the microchannel heat exchanger, with its highly efficient heat exchange structure, directly absorbs solar radiation heat and transfers it to the circulating water. This direct heat exchange method in this embodiment avoids the additional energy consumption associated with the operation of the heat pump system, improves the system's energy efficiency, meets the relatively mild heating demands of summer, and achieves synergy between efficient solar energy utilization and energy-saving system operation.

[0041] In some embodiments, during winter operation, the PVT unit 11 switches to heat pump mode. Solar radiation heat, as a low-grade heat source for the heat pump system, is collected by a microchannel heat exchanger and then circulates within the system. Within the heat pump system, the quality of solar radiation heat is enhanced through the coordinated operation of components such as the compressor, evaporator, condenser, and throttling device. The compressor performs work on the refrigerant, increasing its pressure and temperature; in the condenser, the high-temperature, high-pressure refrigerant releases heat to the circulating water, heating it to meet the higher heating demands in winter. This embodiment fully utilizes solar energy, a clean energy source, effectively reducing the consumption of traditional high-grade energy sources. Simultaneously, heat pump technology enhances the utilization value of solar energy, strengthening the system's heating capacity and stability during cold seasons.

[0042] According to some embodiments of the present invention, the heat pump upgrading unit 30 includes a third heat exchanger 31 and a heat pump unit 32; the third heat exchanger 31 is connected to the water loop network 20 and the energy storage center 40, adapted to absorb the heat energy of the circulating water and transfer the heat energy to the energy storage center 40; one side of the heat pump unit 32 is connected to the water loop network 20, adapted to absorb the heat energy of the circulating water; the other side is connected to the energy storage center 40, adapted to transfer the heat energy to the energy storage center 40; and the heat pump unit 32 is adapted to upgrade the absorbed heat energy. Figure 1-3 As shown, in this embodiment, by setting a third heat exchanger 31, the waste heat absorbed by the waste heat recovery unit 10 can be further transferred to the energy storage center 40 through direct heat exchange; by setting a heat pump unit 32 to absorb the heat energy of the circulating water, the low-grade heat energy in the circulating water is extracted and upgraded into high-temperature heat energy, which is then transferred to the energy storage center 40. The third heat exchanger 31 is constructed as a high-efficiency heat exchanger.

[0043] According to some embodiments of the present invention, the heat pump unit 32 includes multiple heat pumps, each of which is selectively turned on and off based on the thermal energy of the circulating water. In this embodiment, multiple heat pumps are provided, and these heat pumps can be configured as different types of high-temperature heat pumps, enabling multiple high-temperature heat pumps to operate collaboratively. The operating mode can be intelligently and flexibly adjusted according to the real-time temperature and flow parameters of different waste heat sources and the dynamic changes in the heat demand of the heat-using workshop. Specifically, when the waste heat source temperature is high, the high-efficiency high-temperature heat pump unit 32 is started first to maximize energy conversion efficiency; when the waste heat source temperature is low or the heat demand increases significantly, multiple heat pumps operate in conjunction to ensure sufficient and stable heating supply, meeting various heating needs in the production process. The heat pump upgrading unit 30 in this embodiment is a composite system organically integrating a high-efficiency heat exchanger and multiple high-temperature heat pumps.

[0044] According to some embodiments of the present invention, a plurality of first heat exchangers include a flue water heat exchanger 12, an ammonia refrigeration condensing heat recovery heat exchanger 13, and a wastewater heat exchanger 14; the waste heat recovery unit 10 further includes a saccharification workshop waste heat recovery heat exchanger 15, which is connected to a water loop network 20 to provide waste heat to the circulating water; or the saccharification workshop waste heat recovery heat exchanger 15 is connected to an energy storage center 40 through a second heat storage pipeline 60 to transfer heat energy to the energy storage center 40.

[0045] In this embodiment, as Figure 1-3 As shown, the flue gas heat exchanger 12, the ammonia refrigeration condensing heat recovery heat exchanger 13, and the wastewater heat exchanger 14 can respectively absorb and utilize the waste heat from boiler flue gas, the waste heat generated by ammonia refrigeration condensation, and the wastewater, achieving multi-heat source and multi-grade waste heat recovery and utilization. Specifically, the flue gas heat exchanger 12 is connected to a water loop network 20 on one side and a flue gas pipeline on the other. High-temperature flue gas from the boiler room flows through the flue gas heat exchanger 12 in the flue gas pipeline, transferring heat to the circulating water and raising its temperature. The ammonia refrigeration condensing heat recovery heat exchanger 13 is connected to a water loop network 20 on one side and a cold air pipeline on the other. Ammonia refrigeration exhaust flows through the ammonia refrigeration condensing heat recovery heat exchanger 13 in the cold air pipeline, and the heat generated by condensation is transferred to the circulating water to raise its temperature. The wastewater heat exchanger 14 is connected to a water loop network 20 on one side and a wastewater pipeline on the other. Wastewater from brewing and packaging processes is transferred to the circulating water in the wastewater heat exchanger 14 to raise its temperature. Among them, the flue gas pipeline, the cold air pipeline and the sewage pipeline can be equipped with structures such as water pumps to make the medium circulate.

[0046] Furthermore, the waste heat recovery heat exchanger 15 in the saccharification workshop can directly absorb the waste heat generated during production. Since the waste heat temperature in the saccharification workshop is relatively high, it can bypass the heat pump upgrading unit 30 for upgrading. Therefore, the waste heat recovery heat exchanger 15 can be directly connected to the energy storage center 40 via the second heat storage pipeline 60, transferring the heat energy to the energy storage center 40 for storage. The second heat storage pipeline 60 contains circulating water and other circulating media to facilitate heat transfer. When the waste heat recovery heat exchanger 15 is connected to the energy storage center 40 via the second heat storage pipeline 60, the waste heat recovery efficiency can be significantly improved, reducing energy consumption caused by long-distance transportation via the water loop network 20. In addition, the waste heat recovery heat exchanger 15 can also be connected to the water loop network 20 to transfer heat energy to the circulating water, mixing with other heat sources for heating.

[0047] In some embodiments, the flue gas heat exchanger 11 can be configured as an indirect heat exchanger or a direct heat exchanger, depending on the actual operating conditions and technical requirements. High-temperature flue gas from the boiler room enters the flue gas heat exchanger, transferring heat to the circulating water and raising its temperature. Indirect heat exchangers, with their unique structural design, effectively avoid direct contact between flue gas and water, reducing the risk of water pollution and making them suitable for systems with stringent water quality requirements. Direct heat exchangers, with their high-efficiency heat exchange characteristics, can quickly transfer heat from the flue gas to the circulating water, offering significant advantages in applications with relatively relaxed water quality requirements and a greater emphasis on heat exchange efficiency.

[0048] In some embodiments, the wastewater heat exchanger 14 may be selected from different water-to-water heat exchangers depending on the water quality. Specifically, for wastewater with good quality and few impurities, a plate heat exchanger may be selected, which has the advantages of high heat transfer efficiency and small footprint; for wastewater with poor quality and containing more impurities and suspended solids, a spiral plate heat exchanger or a shell-and-tube heat exchanger may be selected, which is less prone to clogging and easier to clean and maintain.

[0049] This invention enables high system integration and cost optimization: it improves waste heat recovery efficiency, achieving efficient and complementary utilization of different waste heat resources; it enables precise on-demand heating to meet heating needs, improve energy utilization efficiency, and reduce energy waste. Furthermore, this invention can be extended to process industries such as beverages and dairy products, and is particularly suitable for production scenarios with dispersed waste heat sources and fluctuating heating demands. This invention can flexibly adjust waste heat collection and heating distribution methods according to production characteristics, achieving efficient energy utilization, effectively recovering waste heat, meeting different heating needs, reducing production costs, and improving the economic and environmental benefits of enterprises.

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0051] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0052] In the description of this invention, "a plurality of" means two or more.

[0053] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0054] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A thermal energy center for the beer industry based on multi-grade waste heat recovery, characterized in that, include: The waste heat recovery unit includes a plurality of first heat exchangers, which are respectively disposed at different waste heat sources to be suitable for collecting waste heat. A water ring network is provided, which connects multiple first heat exchangers. The water ring network is provided with circulating water, which is suitable for heat exchange and temperature rise in the first heat exchangers and for transferring heat energy. A heat pump upgrading unit includes a waste heat side and a heating side. The waste heat side is connected to the water loop network to absorb the heat energy of the circulating water. The heat pump upgrading unit is adapted to upgrade the absorbed heat energy. An energy storage center is connected to the heating side via a first thermal storage pipeline. The first thermal storage pipeline is equipped with a circulating medium, which absorbs and enhances the thermal energy on the heating side and transfers it to the energy storage center. The energy storage center is suitable for storing thermal energy and supplying heat to the outside.

2. The beer industry thermal energy center based on multi-grade waste heat recovery according to claim 1, characterized in that, The water ring network includes a main water supply pipeline and a main return water pipeline; wherein Each of the first heat exchangers is connected to a supply water branch and a return water branch, the supply water branch being connected to the main supply water branch, and the return water branch being connected to the main return water branch, to accommodate multiple first heat exchangers connected in parallel; or Multiple first heat exchangers are connected in series between the main water supply line and the main water return line.

3. The beer industry thermal energy center based on multi-grade waste heat recovery according to claim 2, characterized in that, The water ring network is equipped with at least one water pump and at least one regulating valve. The water pump is used to regulate the water pressure of the circulating water, and the regulating valve is adapted to control the flow rate of the circulating water.

4. The beer industry thermal energy center based on multi-grade waste heat recovery according to claim 3, characterized in that, Also includes: The intelligent control unit includes at least one temperature sensor and at least one flow sensor. The intelligent control unit is adapted to control the operation of the water pump, the regulating valve, and the heat pump upgrading unit based on the detection results of the temperature sensor and the flow sensor, so as to adjust the heating supply.

5. The beer industry thermal energy center based on multi-grade waste heat recovery according to claim 1, characterized in that, The waste heat recovery unit also includes: PVT units are connected to the water ring network or the energy storage center, and the PVT units are adapted to collect solar radiation heat to supplement heating.

6. The beer industry thermal energy center based on multi-grade waste heat recovery according to claim 5, characterized in that, The PVT unit includes: A photovoltaic thermal module, wherein the photovoltaic thermal module is adapted to convert solar radiation energy into electrical energy and heat energy; The second heat exchanger is adapted to absorb and transfer the heat energy generated by the photovoltaic thermal module. A heat pump system, the heat pump system being connected to the second heat exchanger and adapted to enhance the heat energy absorbed by the second heat exchanger.

7. The beer industry thermal energy center based on multi-grade waste heat recovery according to claim 6, characterized in that, The second heat exchanger and the heat pump system are optionally connected to the water network or energy storage center to adapt the PVT unit to switch between heat exchanger mode and heat pump mode.

8. The beer industry thermal energy center based on multi-grade waste heat recovery according to claim 1, characterized in that, The heat pump upgrading unit includes: A third heat exchanger is connected to the water ring network and the energy storage center, and is adapted to absorb the heat energy of the circulating water and transfer the heat energy to the energy storage center. A heat pump unit, wherein one side of the heat pump unit is connected to the water loop network to absorb the heat energy of the circulating water; the other side is connected to the energy storage center to transfer heat energy to the energy storage center; and the heat pump unit is adapted to improve the quality of the absorbed heat energy.

9. The beer industry thermal energy center based on multi-grade waste heat recovery according to claim 8, characterized in that, The heat pump unit includes multiple heat pumps, each of which is adapted to be selectively turned on or off based on the thermal energy of the circulating water.

10. The beer industry thermal energy center based on multi-grade waste heat recovery according to claim 1, characterized in that, The plurality of first heat exchangers include a flue water heat exchanger, an ammonia refrigeration condensation heat recovery heat exchanger, and a wastewater heat exchanger; The waste heat recovery unit further includes: a waste heat recovery heat exchanger for the saccharification workshop, which is connected to the water loop network to provide waste heat to the circulating water; or the waste heat recovery heat exchanger for the saccharification workshop is connected to the energy storage center through a second heat storage pipeline to transfer heat energy to the energy storage center.

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