Waste cold and waste heat double-effect utilization system and operation method thereof

Abstract

The invention discloses a waste cold and waste heat double-effect utilization system and an operation method thereof. The system comprises a hot water tank, a cold water tank, a water source heat pump and an energy recovery device used for recovering waste cold and waste heat in production equipment. The energy recovery device communicates with the cold water tank through a waste cold recovery pipeline and communicates with the hot water tank through a waste heat recovery pipeline. The water source heat pump communicates with the cold water tank through a cold supplementing circulation pipeline and communicates with the hot water tank through a heat supplementing circulation pipeline. The cold water tank communicates with production equipment through a cold energy pipeline and is used for providing cold energy. The hot water tank communicates with production equipment through a heat energy pipeline to provide heat energy. According to the system and the method, waste cold and waste heat in production equipment are recycled, energy waste is avoided, and the energy utilization efficiency is remarkably improved; and meanwhile, the water source heat pump is used for supplementing energy to the recycled waste cold and waste heat, the recycled waste cold and waste heat is improved into high-grade energy, and compared with other heat supply and refrigeration technologies, the operation energy consumption is low, and remarkable economic benefits can be brought to enterprises.

Description

Technical Field

[0001] The present invention belongs to the field of thermal energy engineering, and in particular relates to a waste cooling and waste heat dual-effect utilization system and an operation method thereof. Background Art

[0002] At present, my country's energy utilization still has the main problems of low utilization efficiency, poor economic benefits and great ecological and environmental pressure. Energy conservation and emission reduction, reducing energy consumption and improving comprehensive energy utilization rate are important contents of energy development strategic planning, which are the fundamental ways to solve my country's energy problems and are in a priority development position. The goal of achieving energy conservation and emission reduction and improving energy utilization rate mainly depends on the industrial field.

[0003] Specifically, many industries have both heat and cold demands in the production process. For example, the brewing process of condiments such as soy sauce, bean paste, and fermented black beans not only requires steam heating of the steamed materials, but also requires necessary cooling measures before and during the koji making process to keep the materials at a reasonable temperature. However, the energy in this industry is mostly one-time use, and the waste heat generated after steam heating is mostly directly discarded, while the one-time cold source provided by the refrigerator is often used when the proper temperature (cold temperature) fermentation requires cooling. Therefore, how to effectively use the waste cold and waste heat is an important way for enterprises to achieve energy conservation and emission reduction and improve energy utilization. Summary of the invention

[0004] In order to solve the above deficiencies in the prior art, the present invention aims to provide a waste cooling and waste heat dual-effect utilization system and an operation method thereof, so as to improve energy utilization efficiency, reduce production costs, and thus enhance economic benefits.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a waste cooling and waste heat dual-effect utilization system, comprising a hot water tank, a cold water tank, a water source heat pump and an energy recovery device for recovering waste cooling and waste heat in production equipment; Among them, the energy recovery device is connected to the cold water tank through the waste cooling recovery pipeline and to the hot water tank through the waste heat recovery pipeline; the water source heat pump is connected to the cold water tank through the supplementary cooling circulation pipeline and to the hot water tank through the supplementary heating circulation pipeline; the cold water tank is connected to the production equipment through the cold energy pipeline to provide cold energy; the hot water tank is connected to the production equipment through the heat energy pipeline to provide heat energy.

[0006] As a limitation of the present invention, the outlet of the waste cooling recovery pipeline is connected to the upper part of the cold water tank, and the waste heat recovery pipeline includes a first branch pipeline whose outlet is connected to the upper part of the hot water tank and a second branch pipeline whose outlet is connected to the lower part of the hot water tank; The inlet of the supplementary cooling circulation pipeline is connected to the upper part of the cold water tank, and the outlet of the supplementary cooling circulation pipeline is connected to the lower part of the cold water tank; The inlet of the heat supplement circulation pipeline is connected to the lower part of the hot water tank, and the outlet of the heat supplement circulation pipeline is connected to the upper part of the hot water tank; The inlet of the cold energy pipeline is connected to the lower part of the cold water tank, and the heat energy pipeline includes a third branch pipeline whose inlet is connected to the upper part of the hot water tank and a fourth branch pipeline whose inlet is connected to the lower part of the hot water tank.

[0007] As another limitation of the present invention, the energy recovery device includes a heat exchanger for transferring waste cooling in the production equipment to a medium in a waste cooling recovery pipeline or transferring waste heat to a medium in a waste heat recovery pipeline.

[0008] As a further limitation of the present invention, an air source heat pump is also included which is arranged in parallel with the water source heat pump, and the air source heat pump is connected to the cold water tank through a cold supplementary circulation pipeline and is connected to the hot water tank through a hot supplementary circulation pipeline.

[0009] As a third limitation of the present invention, it also includes a water replenishment device which is connected to the cold water tank and the hot water tank respectively through the water replenishment pipeline.

[0010] As a further limitation of the present invention, the water replenishment pipeline includes a fifth branch pipeline whose outlet is connected to the upper part of the hot water tank, a sixth branch pipeline whose outlet is connected to the upper part of the cold water tank, a seventh branch pipeline whose outlet is connected to the lower part of the hot water tank, and an eighth branch pipeline whose outlet is connected to the lower part of the cold water tank.

[0011] As another limitation of the present invention, it also includes a first outer pipe connected to a cold energy pipeline for supplying the outside and a second outer pipe connected to a hot energy pipeline for supplying the outside.

[0012] The present invention also discloses an operation method of a waste cooling and waste heat dual-effect utilization system, based on the waste cooling and waste heat dual-effect utilization system as described above, including multiple operation conditions: 1. Residual cold recovery and reuse working conditions: Control the inlet of the residual cold recovery pipeline to be connected to the energy recovery device and the outlet to be connected to the cold water tank, so as to recover the residual cold in the production equipment to the cold water tank; control the inlet of the cold energy pipeline to be connected to the cold water tank and the outlet to be connected to the production equipment, so as to supply the cold energy stored in the cold water tank to the production equipment; 2. Waste heat recovery and reuse working conditions: Control the inlet of the waste heat recovery pipeline to be connected to the energy recovery device and the outlet to be connected to the hot water tank, so as to recover the waste heat in the production equipment to the hot water tank; control the inlet of the heat energy pipeline to be connected to the hot water tank and the outlet to be connected to the production equipment, so as to supply the heat energy stored in the hot water tank to the production equipment; 3. Water source heat pump energy replenishment condition: control the cold replenishment circulation pipeline to be connected with the cold water tank and the water source heat pump, and control the heat replenishment circulation pipeline to be connected with the hot water tank and the water source heat pump; start the water source heat pump to replenish cold energy for the cold water tank and heat energy for the hot water tank at the same time.

[0013] As a limitation of the present invention, it also includes a water replenishment condition: controlling the water replenishment pipeline to be connected with the cold water tank, starting the water replenishment device, and replenishing water to the cold water tank; controlling the water replenishment pipeline to be connected with the hot water tank, starting the water replenishment device, and replenishing water to the hot water tank; Before filling the cold water tank with water, the water temperature is detected. If the water temperature in the water filling device is higher than that in the cold water tank, the water filling pipeline is controlled to be connected to the upper part of the cold water tank; if the water temperature in the water filling device is lower than that in the cold water tank, the water filling pipeline is controlled to be connected to the lower part of the cold water tank; When the water temperature is detected before replenishing the hot water tank, if the water temperature in the water replenishing device is higher than that of the hot water tank, the water replenishing pipeline is controlled to be connected to the upper part of the hot water tank; if the water temperature in the water replenishing device is lower than that of the hot water tank, the water replenishing pipeline is controlled to be connected to the lower part of the hot water tank.

[0014] As a further limitation of the present invention, it also includes the air source heat pump energy replenishment condition: controlling the cold replenishment circulation pipeline to be connected with the cold water tank and the air source heat pump, and controlling the hot replenishment circulation pipeline to be connected with the hot water tank and the air source heat pump; starting the air source heat pump to replenish cold energy for the cold water tank, or to replenish heat energy for the hot water tank.

[0015] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art: (1) The present invention realizes the recovery and reuse of waste cooling and waste heat in production equipment, avoids energy waste, and significantly improves energy utilization efficiency; at the same time, the recovered waste cooling and waste heat are replenished with water source heat pumps to upgrade the waste cooling and waste heat into high-quality energy. Compared with other heating and refrigeration technologies, the present invention has low operating energy consumption and can bring significant economic benefits to enterprises.

[0016] In addition, the combination of waste cooling and waste heat recovery and water source heat pump energy replenishment technology can also help promote the recycling of resources and energy conservation and emission reduction, and contribute to the sustainable development of society.

[0017] (2) The air source heat pump connected in parallel with the water source heat pump in the present invention mainly plays an auxiliary role. When the water source heat pump cannot meet the inlet water temperature requirements of the cold water tank and the hot water tank (for example, in hot summer or cold winter), the air source heat pump can assist or partially replace the water source heat pump to ensure that a relatively stable heat source or cold source can be provided, thereby reducing the impact of factors such as changes in external environmental temperature on system performance and improving the stability and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 It is an overall pipeline flow chart of an embodiment of the present invention; Figure 2 This is a pipeline flow chart under the condition of waste cooling recovery and reuse in an embodiment of the present invention (blue part); Figure 3 It is a pipeline flow chart under the waste heat recovery and reuse working condition in an embodiment of the present invention (orange part); Figure 4 It is a pipeline flow chart of the water source heat pump under the energy replenishment condition in the embodiment of the present invention, wherein the blue part is the pipeline flow chart for replenishing cold energy, and the orange part is the pipeline flow chart for replenishing heat energy; Figure 5 This is a pipeline flow chart of the air source heat pump under the energy replenishment condition in an embodiment of the present invention (blue is the cooling part, orange is the heating part, and green is the common part); Figure 6 1 is a pipeline flow chart under the working conditions of water replenishment and external network output in an embodiment of the present invention, wherein the blue part is the pipeline flow chart of water replenishment, the red part is the pipeline flow chart of heat energy external network output, and the green part is the pipeline flow chart of cold energy external network output; Figure 7 It is a pipeline flow chart when the waste cooling recovery and reuse working condition and the waste heat recovery and reuse working condition are operated synchronously in an embodiment of the present invention (the blue part is waste cooling recovery and reuse, and the orange part is waste heat recovery and reuse); Figure 8 This is a pipeline flow chart of the waste cooling recovery and reuse working condition, waste heat recovery and reuse working condition and water source heat pump energy replenishment working condition in the embodiment of the present invention when the three working conditions are operated synchronously (the blue part is cold energy, and the orange part is heat energy); Fig. 9 It is a pipeline flow chart (orange part) of the operation of some production equipment under the waste heat recovery and reuse working condition in the embodiment of the present invention, and the circulating medium enters from the top and exits from the bottom; Fig.10 It is a pipeline flow chart (orange part) of another part of the production equipment under the waste heat recovery and reuse working condition in the embodiment of the present invention, and the circulating medium enters from the bottom and exits from the top; In the figure: 1. hot water tank; 2. cold water tank; 3. water source heat pump; 4. air source heat pump; 5. water supply device; 6. production equipment; 7. pure water machine; 8. water storage tank; 9. residual cooling recovery pipeline; 10. residual heat recovery main pipe; 11. first branch pipeline; 12. second branch pipeline; 13. third external discharge pipe; 14. supplementary cooling circulation pipeline; 15. supplementary heat circulation pipeline; 16. cold energy pipeline; 17. heat energy main pipe; 18. third branch pipeline; 19. fourth branch pipeline; 20. water supply main pipe; 21. fifth branch pipeline; 22. sixth branch pipeline; 23. seventh branch pipeline; 24. eighth branch pipeline; 25. first external discharge pipe; 26. second external discharge pipe. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and understand the present invention, and are not used to limit the present invention.

[0021] This embodiment discloses a system for utilizing waste heat and waste cooling in dual effect. Figure 1As shown, it includes a hot water tank 1, a cold water tank 2, an energy recovery device, a water source heat pump 3, an air source heat pump 4, a water replenishment device 5 and instruments, and also includes pipelines for connecting all the above devices arranged according to process requirements and safety requirements. During operation, the medium circulates in order among the devices through the pipelines to realize the recovery and reuse of the waste heat and cold of the production equipment 6.

[0022] In this embodiment, water is used as the circulating medium. Figures 1 to 10 In the figure, A stands for steam.

[0023] 1. Hot water tank 1, cold water tank 2 The hot water tank 1 is used to store hot water. Since the density of water varies with temperature, in the same hot water tank 1, hot water with higher temperature is usually in the upper part, and hot water with lower temperature is usually in the lower part. Therefore, when circulating water, hot water with higher temperature is generally taken from the upper part of the hot water tank 1 to provide a heat source, and the hot water after heat exchange is returned to the bottom of the hot water tank 1; The cold water tank 2 is used to store cold water. Similarly, in the same cold water tank 2, the cold water with higher temperature is in the upper part, and the cold water with lower temperature is in the lower part (the temperature of the cold water in this embodiment is above 4°C). Therefore, when circulating water, the cold water is pumped out from the lower part of the cold water tank 2 to provide a cold source, and the cold water with higher temperature after use is returned to the upper part of the cold water tank 2.

[0024] In this embodiment, the hot water tank 1 and the cold water tank 2 have the same structure, and both use a tank body with a height ≥ diameter in the existing structure. The tank body is made according to the standard of a thin-walled stainless steel atmospheric pressure container, and the exterior is constructed with a heat-resistant closed-cell foam plastic used as a building material to form an insulation layer, and the exterior of the insulation layer is covered with a color steel plate, a thin stainless steel plate, a thin aluminum plate or a galvanized plate. The height of the tank body is ≥ the diameter, and the water in the tank body can form a stable temperature stratification. This stratified structure can reduce the heat exchange between the upper water and the lower water, reduce the overall energy loss, and thus achieve a better energy-saving effect.

[0025] In actual application, the volume and number of hot water tank 1 and cold water tank 2 need to be adjusted according to the actual situation of the enterprise.

[0026] 2. Energy recovery device The energy recovery device is used to recover the waste cooling and waste heat in the production equipment 6. The energy recovery device in this embodiment is a heat exchanger in the prior art, which is not shown in the drawings.

[0027] 3. Water source heat pump 3, air source heat pump 4 The water source heat pump 3 and the air source heat pump 4 are both existing structures, and are used to cool the water in the cold water tank 2 and heat the water in the hot water tank 1. During operation, the water source heat pump 3 is the main one and the air source heat pump 4 is the auxiliary one. When the water source heat pump 3 cannot meet the use requirements, the air source heat pump 4 assists or partially replaces the water source heat pump 3.

[0028] 4. Water replenishment device 5 The water replenishing device 5 is used to replenish water to the cold water tank 2 and the hot water tank 1 so that they can maintain the standard water level during operation. In this embodiment, the water replenishing device 5 includes a pure water machine 7 and a water storage tank 8 connected to the pure water machine 7, wherein the pure water machine 7 is connected to an external water source. According to actual conditions, a water softener can be used instead of the pure water machine 7.

[0029] 5. Instruments Instruments include a number of recording instruments, temperature instruments, liquid level instruments, solenoid valves, one-way valves, circulation pumps, external supply pumps, pressure gauges and flow meters that are automatically controlled by the automatic control system. They are arranged on pipelines and equipment according to process requirements and are used to monitor or control the direction, flow, pressure, temperature and other parameters of the circulating medium (water).

[0030] 6. Pipeline The pipelines include a waste cooling recovery pipeline 9, a waste heat recovery pipeline, a cold supplementary circulation pipeline 14, a heat supplementary circulation pipeline 15, a cold energy pipeline 16, a heat energy pipeline and a water supplementary pipeline.

[0031] like Figure 2 As shown, the waste cooling recovery pipeline 9 is connected and arranged between the energy recovery device and the cold water tank 2. Specifically, the inlet of the waste cooling recovery pipeline 9 is connected to the energy recovery device, and the outlet is connected to the upper part of the cold water tank 2. During operation, the energy recovery device transfers the waste cooling in the production equipment 6 to the water in the waste cooling recovery pipeline 9, and then the waste cooling recovery pipeline 9 transfers the cooled water from the upper part to the cold water tank 2.

[0032] like Figure 3 As shown, the waste heat recovery pipeline is connected and arranged between the energy recovery device and the hot water tank 1. Specifically, the waste heat recovery pipeline includes a waste heat recovery main pipe 10 and a first branch pipe 11 and a second branch pipe 12 connected to the waste heat recovery main pipe 10, wherein the inlet of the waste heat recovery main pipe 10 is connected to the energy recovery device, the outlet of the first branch pipe 11 is connected to the upper part of the hot water tank 1, and the outlet of the second branch pipe 12 is connected to the lower part of the hot water tank 1. During operation, the energy recovery device transfers the waste heat in the production equipment 6 to the water in the waste heat recovery main pipe 10, and then transports it according to the water temperature. If the water temperature of the waste heat recovery main pipe 10 is higher than that of the hot water tank 1, it is transported from the upper part to the hot water tank 1 through the first branch pipe 11. If the water temperature of the waste heat recovery main pipe 10 is lower than that of the hot water tank 1, it is transported from the lower part to the hot water tank 1 through the second branch pipe 12.

[0033] This embodiment further includes a third outer pipe 13 connected to the waste heat recovery main pipe 10. The third outer pipe 13 can transport the water in the waste heat recovery main pipe 10 back to the production equipment 6 for use, such as for moistening the material when brewing soy sauce.

[0034] The supplementary cooling circulation pipeline 14 is connected and arranged between the water source heat pump 3 and the cold water tank 2. Figure 4 As shown, the inlet of the supplementary cooling circulation pipeline 14 is connected to the upper part of the cold water tank 2, and the outlet is connected to the lower part of the cold water tank 2. During operation, the cold water with a higher temperature in the upper part of the cold water tank 2 enters the water source heat pump 3 through the supplementary cooling circulation pipeline 14, and returns to the lower part of the cold water tank 2 through the supplementary cooling circulation pipeline 14 after heat exchange and temperature reduction.

[0035] The heat supply circulation pipeline 15 is connected between the water source heat pump 3 and the hot water tank 1. Figure 4 As shown, the inlet of the supplementary heat circulation pipeline 15 is connected to the lower part of the hot water tank 1, and the outlet is connected to the upper part of the hot water tank 1. During operation, the hot water with a lower temperature in the lower part of the hot water tank 1 enters the water source heat pump 3 through the supplementary heat circulation pipeline 15, and returns to the upper part of the hot water tank 1 through the supplementary heat circulation pipeline 15 after heat exchange and temperature increase.

[0036] Furthermore, in this embodiment, the air source heat pump 4 and the water source heat pump 3 are arranged in parallel, and the air source heat pump 4 and the water source heat pump 3 share the above-mentioned supplementary cooling circulation pipeline 14 and supplementary heating circulation pipeline 15. Figure 5 As shown, additional branch pipelines are provided so that the air source heat pump 4 can be connected to the cold water tank 2 through the cold supplementary circulation pipeline 14 and to the hot water tank 1 through the hot supplementary circulation pipeline 15. It should be noted that the air source heat pump 4 cannot provide cold supplementary and hot supplementary at the same time, so under the control of the valve, the outlet of the air source heat pump 4 can only be connected to the cold water tank 2 or the hot water tank 1 separately. When the air source heat pump 4 is in cooling condition, it is connected to the cold water tank 2, the inlet of the air source heat pump 4 is connected to the upper part of the cold water tank 2, and the outlet is connected to the lower part of the cold water tank 2; when the air source heat pump 4 is in heating condition, it is connected to the hot water tank 1, the inlet of the air source heat pump 4 is connected to the lower part of the hot water tank 1, and the outlet is connected to the upper part of the hot water tank 1.

[0037] The cold energy pipeline 16 is connected and arranged between the cold water tank 2 and the production equipment 6, and is used to provide the low-temperature cold water stored in the cold water tank 2 to the production equipment 6. Specifically, the inlet of the cold energy pipeline 16 is connected to the lower part of the cold water tank 2, and the outlet is connected to the production equipment 6 (generally, heat exchange is performed instead of directly using low-temperature cold water). During operation, the low-temperature cold water at the lower part of the cold water tank 2 is transported to the production equipment 6 through the cold energy pipeline 16 to provide a cold source.

[0038] The heat energy pipeline is connected and arranged between the hot water tank 1 and the production equipment 6, and is used to supply the high-temperature hot water stored in the hot water tank 1 to the production equipment 6. Specifically, the heat energy pipeline includes a heat energy main pipe 17 and a third branch pipe 18 and a fourth branch pipe 19 connected to the heat energy main pipe 17. The inlet of the third branch pipe 18 is connected to the upper part of the hot water tank 1, and the inlet of the fourth branch pipe 19 is connected to the lower part of the hot water tank 1. The outlet of the heat energy main pipe 17 is connected to the production equipment 6. During operation, selection is made according to the water temperature in the hot water tank 1: if the water temperature in the tank is generally high, the fourth branch pipe 19 is used to transport the high-temperature hot water in the lower part to the production equipment 6, such as Fig. 9 If the water temperature in the tank is clearly stratified, with a higher temperature in the upper layer and a lower temperature in the lower layer, a third branch pipe 18 can be used to deliver the high-temperature hot water in the upper portion to the production equipment 6, such as Fig.10 shown.

[0039] The water supply pipeline is connected between the cold water tank 2 and the water supply device 5 and between the hot water tank 1 and the water supply device 5. Figure 6 As shown, the water replenishment pipeline includes a water replenishment main pipe 20 and a fifth branch pipe 21, a sixth branch pipe 22, a seventh branch pipe 23 and an eighth branch pipe 24 connected to the water replenishment pipe, wherein the inlet of the water replenishment main pipe 20 is connected to the water storage tank 8 in the water replenishment device 5, the outlet of the fifth branch pipe 21 is connected to the upper part of the hot water tank 1, the outlet of the sixth branch pipe 22 is connected to the upper part of the cold water tank 2, the outlet of the seventh branch pipe 23 is connected to the lower part of the hot water tank 1, and the outlet of the eighth branch pipe 24 is connected to the lower part of the cold water tank 2. When replenishing water, replenishment water with a temperature higher than that of the water in the water tank is replenished from the upper part, and replenishment water with a temperature lower than that of the water in the water tank is replenished from the lower part.

[0040] It should be supplemented that the present embodiment further includes a first outer row pipe 25 and a second outer row pipe 26. Figure 6 As shown, the first external discharge pipe 25 is connected to the cold energy pipeline 16, and is used to supply water from the cold water tank 2 to the outside; the second external discharge pipe 26 is connected to the heat energy pipeline, and is used to supply water from the hot water tank 1 to the outside. When hot water is supplied externally, hot water is generally taken from the third branch pipeline 18 and the heat energy main pipeline 17 from the upper part of the hot water tank 1 for external supply; there is also a situation where the second external discharge pipe 26 is connected to the third branch pipeline 18 and the fourth branch pipeline 19 at the same time, so that the high-temperature hot water at the upper part of the hot water tank 1 and the low-temperature hot water at the lower part enter the second external discharge pipe 26 at the same time, and the water is mixed and temperature-adjusted in the second external discharge pipe 26 before being discharged externally, so that the temperature of the discharged water is lower than the high-temperature hot water at the upper part of the hot water tank 1, but higher than the low-temperature hot water at the lower part of the hot water tank 1, and the temperature of the externally supplied hot water is adjusted by the valve opening.

[0041] This embodiment also discloses an operation method of the waste cooling and waste heat dual-effect utilization system, based on the waste cooling and waste heat dual-effect utilization system as described above, including multiple operation conditions: One is the waste cooling recovery and reuse condition: Figure 2 As shown, the inlet of the waste cooling recovery pipeline 9 is controlled to be connected to the energy recovery device, and the outlet is controlled to be connected to the cold water tank 2, so that the waste cooling in the production equipment 6 is recovered to the cold water tank 2; the inlet of the cold energy pipeline 16 is controlled to be connected to the cold water tank 2, and the outlet is controlled to be connected to the production equipment 6, so that the cold energy stored in the cold water tank 2 is supplied to the production equipment 6.

[0042] The second is the waste heat recovery and reuse condition: Figure 3 As shown, the inlet of the waste heat recovery pipeline is controlled to be connected to the energy recovery device, and the outlet is connected to the hot water tank 1, so that the waste heat in the production equipment 6 is recovered to the hot water tank 1; the inlet of the thermal energy pipeline is controlled to be connected to the hot water tank 1, and the outlet is connected to the production equipment 6, so that the thermal energy stored in the hot water tank 1 is supplied to the production equipment 6.

[0043] The third is the water source heat pump 3 energy replenishment condition: Figure 4 As shown, the cold supply circulation pipeline 14 is controlled to be connected with the cold water tank 2 and the water source heat pump 3, and the hot supply circulation pipeline 15 is controlled to be connected with the hot water tank 1 and the water source heat pump 3; the water source heat pump 3 is started to supplement the cold energy for the cold water tank 2 and supplement the heat energy for the hot water tank 1 at the same time.

[0044] The fourth is the air source heat pump 4 energy replenishment condition: Figure 5 As shown, the cold supplement circulation pipeline 14 is controlled to be connected with the cold water tank 2 and the air source heat pump 4, and the heat supplement circulation pipeline 15 is controlled to be connected with the hot water tank 1 and the air source heat pump 4; the air source heat pump 4 is started to supplement cold energy for the cold water tank 2, or to supplement heat energy for the hot water tank 1 (the air source heat pump 4 cannot supplement cold energy and heat energy simultaneously, and only one can be selected). It should be noted that under normal circumstances, the air source heat pump 4 does not operate independently in the energy supplement working condition, but operates synchronously with the water source heat pump 3 in the energy supplement working condition.

[0045] The fifth is the water replenishment condition: Figure 6 As shown, the water replenishment pipeline is controlled to be connected with the cold water tank 2, and the water replenishment device 5 is started to replenish water for the cold water tank 2; or the water replenishment pipeline is controlled to be connected with the hot water tank 1, and the water replenishment device 5 is started to replenish water for the hot water tank 1; or water is replenished for the cold water tank 2 and the hot water tank 1 at the same time.

[0046] It should be noted that the water temperature needs to be detected before replenishing the cold water tank 2. If the water temperature in the water replenishing device 5 is higher than that of the cold water tank 2, the water replenishing pipeline is controlled to be connected to the upper part of the cold water tank 2; if the water temperature in the water replenishing device 5 is lower than that of the cold water tank 2, the water replenishing pipeline is controlled to be connected to the lower part of the cold water tank 2; Before replenishing water to the hot water tank 1, the water temperature needs to be detected. If the water temperature in the water replenishing device 5 is higher than that of the hot water tank 1, the water replenishing pipeline is controlled to be connected to the upper part of the hot water tank 1; if the water temperature in the water replenishing device 5 is lower than that of the hot water tank 1, the water replenishing pipeline is controlled to be connected to the lower part of the hot water tank 1.

[0047] The sixth is the external network supply conditions: Figure 6As shown, the inlet of the cold energy pipeline 16 is controlled to be connected to the cold water tank 2, and the first external discharge pipe 25 is controlled to be connected to the cold energy pipeline 16, so that the cold energy (cold water) stored in the cold water tank 2 is supplied to the external network for use; the inlet of the heat energy pipeline is controlled to be connected to the hot water tank 1, and the second external discharge pipe 26 is controlled to be connected to the heat energy pipeline, so that the heat energy (hot water) stored in the hot water tank 1 is supplied to the external network for use. It should be noted that in order to ensure the water level in the cold water tank 2 and the hot water tank 1, the external network supply condition is usually operated synchronously with the water replenishment condition.

[0048] In this embodiment, all or part of the above working conditions can work in parallel. Figure 7 As shown, the first and second operating conditions are operated synchronously, and both the waste cooling and waste heat are recovered and reused; Figure 8 As shown, on the basis of synchronous operation of working condition one and working condition two, working condition three is added, and the water source heat pump 3 is used to supplement energy to ensure that the water temperature in the cold water tank 2 and the hot water tank 1 can always meet the use requirements.

[0049] The present embodiment can be controlled by the distributor to supply energy to part of the production equipment 6. For example: Fig. 9 As shown, when the second operating condition is running, only the left production equipment 6 is powered; Fig.10 As shown, when the second working condition is running, energy is only supplied to the right production equipment 6. It is also possible to supply heat energy to one side of the production equipment 6 and cold energy to the other side through a manifold; this can be done simultaneously or separately.

[0050] It should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A system for utilizing waste cooling and waste heat in dual effect, characterized in that: It includes a hot water tank, a cold water tank, a water source heat pump, and an energy recovery device for recovering waste heat and cold in production equipment; Among them, the energy recovery device is connected to the cold water tank through the waste cooling recovery pipeline and to the hot water tank through the waste heat recovery pipeline; the water source heat pump is connected to the cold water tank through the supplementary cooling circulation pipeline and to the hot water tank through the supplementary heating circulation pipeline; the cold water tank is connected to the production equipment through the cold energy pipeline to provide cold energy; the hot water tank is connected to the production equipment through the heat energy pipeline to provide heat energy.

2. The waste cooling and waste heat dual-effect utilization system according to claim 1 is characterized in that: The outlet of the waste cooling recovery pipeline is connected to the upper part of the cold water tank, and the waste heat recovery pipeline includes a first branch pipeline whose outlet is connected to the upper part of the hot water tank and a second branch pipeline whose outlet is connected to the lower part of the hot water tank; The inlet of the supplementary cooling circulation pipeline is connected to the upper part of the cold water tank, and the outlet of the supplementary cooling circulation pipeline is connected to the lower part of the cold water tank; The inlet of the heat supplement circulation pipeline is connected to the lower part of the hot water tank, and the outlet of the heat supplement circulation pipeline is connected to the upper part of the hot water tank; The inlet of the cold energy pipeline is connected to the lower part of the cold water tank, and the heat energy pipeline includes a third branch pipeline whose inlet is connected to the upper part of the hot water tank and a fourth branch pipeline whose inlet is connected to the lower part of the hot water tank.

3. The waste cooling and waste heat dual-effect utilization system according to claim 1 or 2 is characterized in that: The energy recovery device comprises a heat exchanger for transferring the waste cooling in the production equipment to the medium in the waste cooling recovery pipeline or transferring the waste heat to the medium in the waste heat recovery pipeline.

4. The waste cooling and waste heat dual-effect utilization system according to claim 3 is characterized in that: It also includes an air source heat pump arranged in parallel with the water source heat pump. The air source heat pump is connected to the cold water tank through a cold supplementary circulation pipeline and is connected to the hot water tank through a hot supplementary circulation pipeline.

5. The waste cooling and waste heat dual-effect utilization system according to any one of claims 1, 2 and 4, characterized in that: It also includes a water replenishing device which is connected with the cold water tank and the hot water tank respectively through the water replenishing pipeline.

6. The waste cooling and waste heat dual-effect utilization system according to claim 5 is characterized in that: The water replenishment pipeline includes a fifth branch pipeline whose outlet is connected to the upper part of the hot water tank, a sixth branch pipeline whose outlet is connected to the upper part of the cold water tank, a seventh branch pipeline whose outlet is connected to the lower part of the hot water tank, and an eighth branch pipeline whose outlet is connected to the lower part of the cold water tank.

7. The waste cooling and waste heat dual-effect utilization system according to any one of claims 1, 2, 4 and 6, characterized in that: It also includes a first outer pipe connected to a cold energy pipeline for supplying the outside and a second outer pipe connected to a hot energy pipeline for supplying the outside.

8. An operating method of a waste cooling and waste heat dual-effect utilization system, characterized in that: The waste cooling and waste heat dual-effect utilization system according to any one of claims 1 to 7 comprises a plurality of operating conditions:

1. Residual cold recovery and reuse working conditions: Control the inlet of the residual cold recovery pipeline to be connected to the energy recovery device and the outlet to be connected to the cold water tank, so as to recover the residual cold in the production equipment to the cold water tank; control the inlet of the cold energy pipeline to be connected to the cold water tank and the outlet to be connected to the production equipment, so as to supply the cold energy stored in the cold water tank to the production equipment; 2. Waste heat recovery and reuse working conditions: Control the inlet of the waste heat recovery pipeline to be connected to the energy recovery device and the outlet to be connected to the hot water tank, so as to recover the waste heat in the production equipment to the hot water tank; control the inlet of the heat energy pipeline to be connected to the hot water tank and the outlet to be connected to the production equipment, so as to supply the heat energy stored in the hot water tank to the production equipment; 3. Water source heat pump energy replenishment condition: control the cold replenishment circulation pipeline to be connected with the cold water tank and the water source heat pump, and control the heat replenishment circulation pipeline to be connected with the hot water tank and the water source heat pump; start the water source heat pump to replenish cold energy for the cold water tank and heat energy for the hot water tank at the same time.

9. The operating method of the waste cooling and waste heat dual-effect utilization system according to claim 8 is characterized in that: It also includes a water replenishment condition: controlling the water replenishment pipeline to be connected with the cold water tank, starting the water replenishment device, and replenishing water to the cold water tank; controlling the water replenishment pipeline to be connected with the hot water tank, starting the water replenishment device, and replenishing water to the hot water tank; Before filling the cold water tank with water, the water temperature is detected. If the water temperature in the water filling device is higher than that in the cold water tank, the water filling pipeline is controlled to be connected to the upper part of the cold water tank; if the water temperature in the water filling device is lower than that in the cold water tank, the water filling pipeline is controlled to be connected to the lower part of the cold water tank; When the water temperature is detected before replenishing the hot water tank, if the water temperature in the water replenishing device is higher than that of the hot water tank, the water replenishing pipeline is controlled to be connected to the upper part of the hot water tank; if the water temperature in the water replenishing device is lower than that of the hot water tank, the water replenishing pipeline is controlled to be connected to the lower part of the hot water tank.

10. The operating method of the waste cooling and waste heat dual-effect utilization system according to claim 9 is characterized in that: It also includes the air source heat pump energy replenishment condition: controlling the cold replenishment circulation pipeline to be connected with the cold water tank and the air source heat pump, and controlling the hot replenishment circulation pipeline to be connected with the hot water tank and the air source heat pump; starting the air source heat pump to replenish cold energy for the cold water tank, or to replenish hot energy for the hot water tank.

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