Return water gradient utilization process of reclaimed water source heat pump of sewage plant

Abstract

The invention belongs to the technical field of water source heat pump energy taking through reclaimed water, and particularly discloses a sewage plant reclaimed water source heat pump backwater gradient utilization process which comprises a water storage pool used for storing reclaimed water, and a water inlet pump is installed in the water storage pool; the water source heat pump is used for taking energy from the reclaimed water in the reservoir, a water inlet pipe is connected between the water source heat pump and the reservoir, and the water inlet pipe is connected with the water inlet pump; and the water return mechanism is used for conveying the recycled water after energy taking back into the water storage tank or directly outputting the recycled water. Compared with the prior art, the recycled water serving as a heat source or a cold source can be recycled for multiple times, the use amount of the recycled water is reduced, gradient utilization of the recycled water is achieved, the stability of energy supply of the water source heat pump can be improved, the economic benefit of recycled water utilization can be improved, and the problems that recycled water application is low in economic benefit and low in cost are solved. And the method has an important promotion effect on improving the utilization rate of the recycled water and promoting the utilization of clean energy.

Description

Technical Field

[0001] This invention relates to the field of water source heat pump energy extraction technology from reclaimed water, and in particular to a cascade utilization process for reclaimed water from sewage treatment plants using water source heat pumps, which fully explores the potential for clean energy applications from reclaimed water. Background Technology

[0002] Reclaimed water source heat pump systems are currently a common application model in the clean energy field. However, there is limited data on the multiple recycling of reclaimed water. The main application of existing reclaimed water source heat pumps is to directly extract energy from reclaimed water and supply heat or cold energy to users. After the reclaimed water is used, it is either discharged directly or returned to the water intake pipeline. Moreover, most existing reclaimed water supply systems consist of a single pumping system and a single main pipeline. Given the risk of reclaimed water system outages or the risk of reclaimed water source wastewater treatment plants ceasing operations, reclaimed water source heat pumps also face the risk of energy supply interruptions.

[0003] The water source heat pump return water cascade utilization control system can recycle and utilize reclaimed water multiple times, which can save the amount of reclaimed water used, serve as an emergency energy supply method, and improve the stability of the water source heat pump system's energy supply.

[0004] Therefore, it is necessary to invent a process for the cascade utilization of recycled water from wastewater treatment plants using heat pumps to solve the above problems. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a cascade utilization process for reclaimed water from wastewater treatment plants using a source heat pump. This solves the problem of power outages that occur when the heat source fails to supply heat in existing source heat pump systems. This invention solves the problem of maintaining the operation of the source heat pump after the reclaimed water supply is interrupted, providing a stable power supply mode. After the reclaimed water is used as a heat source to extract energy, it can continue to be used for cascade utilization such as municipal greening and river ecological water replenishment, maximizing the application potential of reclaimed water and solving the problem of low economic benefits of reclaimed water.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A wastewater treatment plant reclaimed water source heat pump cascade utilization process includes:

[0008] A water storage tank is used to store reclaimed water, and an inlet pump is installed inside the water storage tank;

[0009] A water source heat pump is used to extract energy from reclaimed water in a water storage tank. The water source heat pump is connected to the water storage tank by an inlet pipe, and the inlet pipe is connected to the inlet pump.

[0010] The water return mechanism is used to transport the recycled water after energy extraction back to the reservoir or output it directly.

[0011] The heat dissipation device includes a heat dissipation box, insulation boards, and sealing components. The heat dissipation box is installed on the water inlet pipe and its interior is connected to the water inlet pipe. There are two insulation boards, which are symmetrically fixed to the top and bottom of the heat dissipation box. A first thermometer for measuring the external temperature is installed on the top insulation board. There are two sealing components, which are symmetrically arranged on the front and rear sides of the heat dissipation box to cooperate with the two insulation boards to seal and insulate the heat dissipation box.

[0012] Furthermore, the water return mechanism includes a water return pipe and a discharge pipe. The water return pipe is connected between the water source heat pump and the water storage tank, and the discharge pipe is connected to the water return pipe. A three-way solenoid valve is installed at the connection between the water return pipe and the discharge pipe, and the three-way solenoid valve is a one-inlet and two-outlet type.

[0013] Furthermore, the water source heat pump is set with a minimum water temperature of 7°C or a maximum water temperature of 32°C. After the water source heat pump extracts energy, when the return water temperature is higher than 7°C or lower than 32°C, the three-way solenoid valve can ensure the return water pipe is open while controlling the discharge pipe to be closed. When the return water temperature is lower than 7°C or higher than 32°C, the three-way solenoid valve can ensure the return water pipe is closed while controlling the discharge pipe to be open.

[0014] Furthermore, the heat dissipation box includes several heat dissipation plates and two connecting plates. Both the heat dissipation plates and the connecting plates are hollow. The multiple heat dissipation plates are evenly distributed horizontally. The two connecting plates are symmetrically connected between the two sides of the multiple heat dissipation plates, and the interior of the heat dissipation plates is connected to the interior of the connecting plates. A connecting pipe is connected to the side of the two connecting plates that are separated from each other. The two connecting pipes are respectively connected between the water inlet pipe and the water source heat pump. A second thermometer for measuring the temperature of the reclaimed water is installed on the connecting pipe near the water inlet pump.

[0015] Furthermore, the sealing assembly includes a movable plate, a limiting rod, a guide rod, and a pushing component. There are two movable plates, symmetrically arranged vertically. The length of each movable plate matches the length of the heat sink, and the width of each movable plate is equal to half the height of the heat sink. Each movable plate has several strip-shaped through holes along its front and rear sides. When the movable plate is in a vertical position, these through holes are directly opposite and close to the front or rear sides of multiple heat sinks. The limiting rod is rotatably connected to both sides of the movable plate. The limiting rod is located on the side where the two movable plates are separated. The limiting rod is horizontally and vertically slidably inserted into the front or rear side of the insulation board. The guide rod is horizontally inserted through the movable plate on the side away from the limiting rod along both sides. The guide rod has symmetrical fixing strips at both ends. The fixing strips are fixedly connected to the connecting plate opposite each other. Vertical guide grooves are opened on the opposite side of the two fixing strips, and the two ends of the guide rod are slidably installed in the two guide grooves respectively. The pushing member is connected to the side of the movable plate near the limiting rod and is used to push the movable plate to tilt it.

[0016] Furthermore, the pushing component includes an electric push rod and a connecting block. The electric push rod is horizontally installed on one side of the two insulation boards that are separated from each other. The connecting block is fixedly connected to the side of the movable plate near the limiting rod. The output end of the electric push rod is hinged to the connecting block facing it.

[0017] Furthermore, rubber sealing gaskets are fixedly connected to the front and rear sides of the heat dissipation plate and the insulation plate. The area of ​​the sealing gasket is larger than the area of ​​the strip-shaped through hole. When the movable plate is in a vertical state, the sealing gasket can fit together with the movable plate. When the movable plate is in the final tilted state under the action of the electric push rod, the multiple strip-shaped through holes on the movable plate can be aligned with the gap between two adjacent heat dissipation plates.

[0018] Furthermore, both the insulation board and the movable board are hollow designs, and both the insulation board and the movable board are filled with an insulation core.

[0019] Furthermore, the top and bottom of the heat sink are provided with several heat dissipation strips, and the length direction of the heat dissipation strips is perpendicular to the front side of the heat sink.

[0020] Furthermore, the top surface of the heat sink gradually increases in height from the front and rear sides towards the middle, and the top surface of the heat sink has an arc design.

[0021] The technical effects and advantages of this invention are as follows:

[0022] 1. Compared with previous technologies, this invention can recycle reclaimed water as a heat source or cold source multiple times, reduce the amount of reclaimed water used, realize the cascade utilization of reclaimed water, improve the stability of water source heat pump energy supply, and improve the economic benefits of reclaimed water utilization. It solves the problems of low economic benefits and low potential utilization of reclaimed water application, and plays an important role in improving the utilization rate of reclaimed water and promoting the use of clean energy.

[0023] 2. The present invention is equipped with a heat dissipation device that can dynamically adapt to the temperature and automatically switch between heat preservation and heat dissipation modes according to the temperature difference between the outside environment and the reclaimed water, ensuring the efficient operation of the water source heat pump; it can reduce the return water temperature of the reclaimed water, extend its compliance with the circulation standard cycle, and improve the utilization rate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the water source heat pump return water cascade utilization process in this invention;

[0025] Figure 2 This is a three-dimensional schematic diagram of the heat dissipation device in this invention;

[0026] Figure 3 This is a schematic diagram of the overall structure of the heat sink in this invention;

[0027] Figure 4 This is a three-dimensional schematic diagram of the structure of the movable plate, guide rod, and pusher in this invention;

[0028] Figure 5 This is a three-dimensional schematic diagram of the insulation board, the first thermometer, the electric push rod, and the sealing gasket in this invention.

[0029] In the diagram: 1. Water storage tank; 2. Inlet pump; 3. Water source heat pump; 4. Inlet pipe; 5. Heat dissipation device; 6. Heat dissipation box; 7. Insulation board; 8. First thermometer; 9. Return pipe; 10. Drain pipe; 11. Three-way solenoid valve; 12. Heat dissipation plate; 13. Connecting plate; 14. Connecting pipe; 15. Second thermometer; 16. Movable plate; 17. Limiting rod; 18. Guide rod; 19. Strip-shaped through hole; 20. Fixing strip; 21. Guide groove; 22. Electric push rod; 23. Connecting block; 24. Sealing gasket; 25. Heat dissipation strip. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0031] Example 1:

[0032] This invention provides, for example Figures 1 to 5The wastewater reclaimed water recycling process shown includes: a water storage tank 1, a water source heat pump 3, a recharge mechanism, and a heat dissipation device 5. The water storage tank 1 stores reclaimed water and is equipped with an inlet pump 2. The water storage tank 1 has a volume of 500 cubic meters, is constructed of reinforced concrete, and has anti-corrosion treatment on its inner walls. It is equipped with two 7.5kW inlet pumps 2, each with a flow rate of 200 cubic meters per hour. The water source heat pump 3 extracts energy from the reclaimed water in the water storage tank 1. The water source heat pump 3 and the water storage tank 1... A water inlet pipe 4 is connected to the water inlet pump 2. A screw-type water source heat pump 3 is selected, with a rated heating capacity of 500kW and a rated cooling capacity of 600kW. A return water mechanism is used to transport the recycled water after energy extraction back to the water storage tank 1 or directly output it. A heat dissipation device 5 includes a heat dissipation box 6, insulation boards 7, and sealing components. The heat dissipation box 6 is installed on the water inlet pipe 4, and the interior of the heat dissipation box 6 is connected to the water inlet pipe 4. There are two insulation boards 7, which are symmetrically fixed to the top of the heat dissipation box 6. The insulation board 7 at the top and bottom of the heat dissipation box 6 is equipped with a first thermometer 8 for measuring the external temperature. Two sealing components are symmetrically arranged on the front and rear sides of the heat dissipation box 6, working in conjunction with the two insulation boards 7 to seal and insulate the heat dissipation box 6. Both the insulation board 7 and the movable plate 16 are hollow, and both are filled with an insulating core. Several pads are evenly fixed to the bottom of the insulation board 7 at the bottom, with the bottom of the pads lower than the bottom of the electric push rod 22, to support the entire heat dissipation device 5. To prevent the bottom electric push rod 22 from contacting the ground and protect it from damage, the heat dissipation box 6 has no fewer than 5 heat dissipation plates 12, each 3 meters long, 1 meter wide, and 0.1 meters thick. The heat dissipation strips 25 at the top and bottom of the heat dissipation plate 12 are 0.05 meters high and spaced 0.1 meters apart. The insulation board 7 is made of polyurethane insulation material with a thickness of 0.15 meters and is filled with rock wool insulation core. The electric push rod 22 is a DTZ300 model with a rated thrust of 3000N and a stroke of 500mm.

[0033] The water return mechanism includes a return pipe 9 and a discharge pipe 10. The return pipe 9 is connected between the water source heat pump 3 and the water storage tank 1. The discharge pipe 10 is connected to the return pipe 9. A three-way solenoid valve 11 is installed at the connection between the return pipe 9 and the discharge pipe 10. The three-way solenoid valve 11 is a one-inlet and two-outlet type. Both the return pipe 9 and the discharge pipe 10 are made of DN200 steel pipe. The three-way solenoid valve 11 is model ZCS-200, with a working pressure of 1.6MPa and is made of stainless steel.

[0034] A water temperature monitoring device is installed in the water storage tank 1 to transmit relevant water temperature data to the host computer system. The host computer controls the reclaimed water utilization mode and sets the minimum water temperature for the water source heat pump 3 to be 7℃ or the maximum water temperature to be 32℃. After the water source heat pump 3 extracts energy, when the return water temperature is higher than 7℃ or lower than 32℃, the three-way solenoid valve 11 can ensure that the return water pipe 9 is open while controlling the discharge pipe 10 to be closed. When the return water temperature is lower than 7℃ or higher than 32℃, the three-way solenoid valve 11 can ensure that the return water pipe 9 is closed while controlling the discharge pipe 10 to be open.

[0035] After the water source heat pump 3 extracts energy, when the return water temperature is higher than 7℃ or lower than 32℃, the three-way solenoid valve 11 is open, and the return water enters the water storage tank 1. The regenerated water that has been used for energy extraction by the water source heat pump 3 is mixed with the regenerated water that has not been used for energy extraction, and is used again as a heat source or cold source for the water source heat pump 3 to extract energy. When the return water temperature is lower than 7℃ or higher than 32℃ after energy extraction by the water source heat pump 3, the solenoid valve is closed, and the return water is discharged from the discharge port for use in municipal greening, river ecological water replenishment, etc., so as to maximize the utilization of regenerated water by the water source heat pump 3, and at the same time, the regenerated water is used in a cascade manner, making multiple uses of one water.

[0036] like Figures 2 to 5 As shown, the heat dissipation box 6 includes several heat dissipation plates 12 and two connecting plates 13. Both the heat dissipation plates 12 and the connecting plates 13 are hollow. The multiple heat dissipation plates 12 are evenly distributed horizontally. The two connecting plates 13 are symmetrically connected between the two sides of the multiple heat dissipation plates 12, and the interior of the heat dissipation plates 12 is connected to the interior of the connecting plates 13. The two connecting plates 13 are connected to the opposite side of each other by a connecting pipe 14. The two connecting pipes 14 are respectively connected between the water inlet pipe 4 and the water source heat pump 3. A second thermometer 15 for measuring the temperature of the reclaimed water is installed on the connecting pipe 14 near the water inlet pump 2.

[0037] The sealing assembly includes a movable plate 16, a limiting rod 17, a guide rod 18, and a pushing component. There are two movable plates 16, symmetrically arranged vertically. The length of each movable plate 16 matches the length of the heat sink 6, and the width of each movable plate 16 is equal to half the height of the heat sink 6. Each movable plate 16 has several strip-shaped through holes 19 along its front and rear sides. When the movable plate 16 is in a vertical position, the multiple strip-shaped through holes 19 are directly opposite and close to the front or rear sides of multiple heat sink plates 12. The limiting rod 17 is rotatably connected to both sides of the movable plate 16, and the limiting rod 17 is located at... On the side where the two movable plates 16 are separated, the limiting rod 17 is horizontally and vertically slidably inserted into the front or rear side of the insulation board 7. The guide rod 18 is horizontally inserted into the side of the movable plate 16 away from the limiting rod 17 along both sides. The guide rod 18 has symmetrical fixing strips 20 at both ends. The fixing strips 20 are fixedly connected to the connecting plate 13 facing each other. The two fixing strips 20 are each provided with a vertical guide groove 21 on the side facing each other. The two ends of the guide rod 18 are slidably installed in the two guide grooves 21 respectively. The pushing member is connected to the side of the movable plate 16 near the limiting rod 17 and is used to push the movable plate 16 to tilt it.

[0038] The pushing component includes an electric push rod 22 and a connecting block 23. The electric push rod 22 is horizontally installed on the side of the two insulation plates 7 that are separated. The connecting block 23 is fixedly connected to the side of the movable plate 16 near the limiting rod 17. The output end of the electric push rod 22 is hinged to the corresponding connecting block 23.

[0039] In the process of heat extraction by the water source heat pump 3 in this invention, when the first thermometer 8 detects that the outside temperature is lower than the regenerated water temperature detected by the second thermometer, the electric push rod 22 is in a shortened state. At this time, the movable plate 16 can remain vertical under the pull of the electric push rod 22 and stick together with the insulation plate 7, thereby cooperating with the insulation plate 7 to keep the heat dissipation box 6 warm.

[0040] During the cooling process of the water source heat pump 3, when the first thermometer 8 detects that the outside temperature is higher than the reclaimed water temperature detected by the second thermometer, the electric push rod 22 can be in a shortened state, thereby insulating the heat dissipation box 6 through the movable plate 16 and the insulation plate 7. When the first thermometer 8 detects that the outside temperature is lower than the reclaimed water temperature detected by the second thermometer, the electric push rod 22 can be extended, thereby pushing the movable plate 16 near the limit rod 17 to deflect away from the heat dissipation plate 12 through the connecting block 23. During the deflection of the movable plate 16, the guide rod 18 can move along the guide groove 21, thereby satisfying the deflection requirements of the movable plate 16. Meanwhile, the limiting rod 17 can gradually extend from the insulation plate 7. When the electric push rod 22 drives the movable plate 16 to deflect to the maximum angle, the strip-shaped through hole 19 on the movable plate 16 can be aligned with the gap between the adjacent heat dissipation plate 12. At this time, when the regenerated water flows in the heat dissipation tank 6, the heat in the regenerated water can be quickly dissipated into the air through the heat dissipation plate 12, thereby further reducing the temperature of the regenerated water. Subsequently, the cooled regenerated water can enter the water source heat pump 3, thereby improving the cooling effect of the water source heat pump 3. At the same time, it also reduces the water temperature flowing into the return pipe from the water source heat pump 3, thereby increasing the number of regenerated water cycles and saving regenerated water.

[0041] Furthermore, when the movable plate 16 is tilted, the two movable plates 16 located on the front and rear sides of the heat sink 6 can form a V-shape, which can gather and guide the external airflow. When there is wind outside, the wind can quickly enter the gap between the adjacent heat sink 12 under the guidance of the movable plate 16, thereby improving the cooling efficiency of the heat sink 12 for regenerated water.

[0042] like Figure 3 and Figure 5 As shown, rubber sealing gaskets 24 are fixedly connected to the front and rear sides of the heat dissipation plate 12 and the insulation plate 7. The area of ​​the sealing gasket 24 is larger than the area of ​​the strip-shaped through hole 19. When the movable plate 16 is in a vertical state, the sealing gasket 24 can fit together with the movable plate 16. When the movable plate 16 is in a final tilted state under the action of the electric push rod 22, the multiple strip-shaped through holes 19 on the movable plate 16 can be aligned with the gap between two adjacent heat dissipation plates 12.

[0043] With the sealing gasket 24 provided, when the movable plate 16 is in a vertical state, the sealing gasket 24 on the insulation plate 7 and the sealing gasket 24 on the heat dissipation plate 12 can respectively adhere to the edge of the movable plate 16 and the strip-shaped through hole 19, thereby achieving the sealing effect on the gap between the movable plate 16 and the insulation plate 7, and the gap between the strip-shaped through hole 19 and the heat dissipation plate 12, thereby improving the heat preservation effect of the movable plate 16 and the insulation plate 7 on the heat dissipation box 6 in winter.

[0044] like Figure 3As shown, the top and bottom of the heat sink 12 are provided with several heat dissipation strips 25, and the length direction of the heat dissipation strips 25 is perpendicular to the front side of the heat sink 12. The height of the top surface of the heat sink 12 gradually increases from the front and rear sides to the middle, and the top surface of the heat sink 12 is designed with an arc surface.

[0045] The presence of heat dissipation strips 25 increases the contact area between the heat dissipation plate 12 and the outside world, thereby improving the cooling efficiency of the heat dissipation plate 12 for the regenerated water entering it. During the use of the heat dissipation plate 12, when the outside wind blows into the top space of the heat dissipation plate 12, the curved design of the top of the heat dissipation plate 12 can work with its insulation plate 7 or the flat bottom of the heat dissipation plate 12 to increase the airflow velocity between adjacent heat dissipation plates 12, thereby further improving the heat dissipation effect of the outside wind on the heat dissipation plate 12.

[0046] Example 2:

[0047] To more clearly illustrate the practical application effect of the wastewater reclaimed water source heat pump return water cascade utilization process in this wastewater treatment plant, a detailed explanation is provided below with reference to specific scenarios.

[0048] (a) Scene setting

[0049] A wastewater treatment plant in a northern city, located in a temperate monsoon climate zone, experiences four distinct seasons. Winter temperatures can reach as low as -15°C, while summer temperatures can reach as high as 35°C. The plant treats approximately 50,000 cubic meters of wastewater daily, producing about 30,000 cubic meters of reclaimed water. Previously, the reclaimed water was primarily used for a small amount of irrigation for green spaces within the plant area, with the remainder being directly discharged, resulting in extremely low energy utilization. Furthermore, in winter and summer, the water source heat pump system often faced unstable power supply issues due to unsuitable reclaimed water temperatures. Therefore, this invention introduces a wastewater reclaimed water source heat pump cascade utilization process to improve the utilization rate of reclaimed water and the stability of the water source heat pump system's power supply.

[0050] (II) Process Operation

[0051] 1. Winter operation (taking January as an example, the average outside temperature is -8℃)

[0052] Initial Stage: The treated reclaimed water from the wastewater treatment plant enters the storage tank 1. When the water level in the storage tank 1 reaches 2 / 3, the inlet pump 2 is started, transporting the reclaimed water through the inlet pipe 4 to the heat dissipation device 5. At this time, the outside temperature is measured to be -8℃ by the first thermometer 8, and the temperature of the reclaimed water in the inlet pipe 4 is measured to be 12℃ by the second thermometer 15. Due to the low outside temperature, to prevent excessive heat loss during transport, the electric push rod 22 is retracted, and the movable plate 16 remains vertical, tightly fitting against the sealing gasket 24 on the heat dissipation plate 12 and the insulation plate 7, sealing and insulating the heat dissipation box 6. The reclaimed water experiences almost no heat loss within the heat dissipation box 6 and enters the water source heat pump 3 through the connecting pipe 14.

[0053] Energy extraction and return water control: The water source heat pump 3 extracts energy from the reclaimed water to provide heating for the surrounding residential areas. After energy extraction, the temperature sensor detects that the return water temperature is 9℃, which is higher than the minimum water temperature set by the water source heat pump 3 by 7℃. At this time, the control system controls the three-way solenoid valve 11 to close the discharge pipe 10 and open the return water pipe 9, so as to transport the extracted reclaimed water back to the water storage tank 1, realizing the recycling of reclaimed water.

[0054] Recycling: After the reclaimed water returns to the storage tank 1, it mixes with the newly entering reclaimed water and is then pumped again by the inlet pump 2 to the water source heat pump 3 for energy extraction. This cycle allows for the reclaimed water to be recycled 3 to 4 times daily, significantly reducing the amount of new reclaimed water used. Statistics show that only 800 cubic meters of new reclaimed water need to be added daily in winter, saving 1200 cubic meters of reclaimed water daily compared to the traditional process (which requires all new reclaimed water, with a daily consumption of approximately 2000 cubic meters).

[0055] Emergency Power Supply: During an extreme cold wave, the wastewater treatment plant experienced a disruption in its reclaimed water supply due to equipment failure. Since the reclaimed water had already been recycled within the system, a certain amount of reclaimed water meeting the temperature requirements was stored in reservoir 1. The water source heat pump system 3 relied on the reclaimed water in reservoir 1 to continue providing stable power for 4 hours until the wastewater treatment plant's reclaimed water supply returned to normal, effectively preventing heating outages in surrounding residential areas.

[0056] 2. Summer operation (taking July as an example, the average outside temperature is 30℃)

[0057] Initial Stage: After the reclaimed water enters the storage tank 1, the inlet pump 2 is started to deliver the reclaimed water to the heat dissipation device 5. The first thermometer 8 measures the outside temperature as 30℃, and the second thermometer 15 measures the temperature of the reclaimed water in the inlet pipe 4 as 30℃. Due to the high outside temperature, in order to lower the temperature of the reclaimed water, the electric push rod 22 is extended, pushing the movable plate 16 to rotate around the guide rod 18, so that the movable plate 16 is tilted, and the strip-shaped through hole 19 on the movable plate 16 is aligned with the gap between the two adjacent heat dissipation plates 12. When the reclaimed water flows in the heat dissipation tank 6, heat is dissipated into the air through the heat dissipation plates 12 and heat dissipation strips 25. After heat dissipation, the temperature of the reclaimed water drops to 26℃ before entering the water source heat pump 3.

[0058] Energy extraction and return water control: The water source heat pump 3 extracts energy from the reclaimed water to cool the surrounding commercial buildings. After energy extraction, the return water temperature is detected to be 31℃, which is lower than the maximum water temperature of 32℃ set by the water source heat pump 3. The control system controls the three-way solenoid valve 11 to close the discharge pipe 10 and open the return water pipe 9, sending the reclaimed water back to the storage tank 1 for recycling.

[0059] High Temperature Handling: During a prolonged period of high temperatures, the outside temperature reached 35℃. Even after cooling by the heat dissipation device 5, the temperature of the reclaimed water remained as high as 33℃. After entering the water source heat pump 3 for energy extraction, the return water temperature rose to 34℃, exceeding the set maximum water temperature of 32℃. At this point, the control system quickly activated the three-way solenoid valve 11, opening the discharge pipe 10 and closing the return water pipe 9. The high-temperature return water was then transported through the discharge pipe 10 to the municipal greening network and river ecological water replenishment system for urban greening irrigation and river replenishment. On that day, approximately 1500 cubic meters of reclaimed water were transported through the discharge pipe 10, of which 1000 cubic meters were used for municipal greening and 500 cubic meters for river ecological water replenishment, achieving the cascade utilization of reclaimed water.

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A process for the cascade utilization of reclaimed water from a wastewater treatment plant using a heat pump, characterized in that, include: A water storage tank (1) is used to store reclaimed water, and an inlet pump (2) is installed in the water storage tank (1). A water source heat pump (3) is used to extract energy from the regenerated water in the water storage tank (1). The water source heat pump (3) is connected to the water storage tank (1) by an inlet pipe (4), and the inlet pipe (4) is connected to the inlet pump (2). The water return mechanism is used to transport the reclaimed water after energy extraction back to the water storage tank (1) or directly output it; The heat dissipation device (5) includes a heat dissipation box (6), insulation boards (7) and sealing components. The heat dissipation box (6) is installed on the water inlet pipe (4) and the interior of the heat dissipation box (6) is connected to the water inlet pipe (4). There are two insulation boards (7). The two insulation boards (7) are symmetrically fixedly connected to the top and bottom of the heat dissipation box (6). A first thermometer (8) for measuring the external temperature is installed on the insulation board (7) at the top. There are two sealing components. The two sealing components are symmetrically arranged on the front and rear sides of the heat dissipation box (6) to cooperate with the two insulation boards (7) to seal and insulate the heat dissipation box (6).

2. The wastewater treatment plant reclaimed water source heat pump cascade utilization process according to claim 1, characterized in that: The water return mechanism includes a water return pipe (9) and a discharge pipe (10). The water return pipe (9) is connected between the water source heat pump (3) and the water storage tank (1). The discharge pipe (10) is connected to the water return pipe (9). A three-way solenoid valve (11) is installed at the connection between the water return pipe (9) and the discharge pipe (10). The three-way solenoid valve (11) is a one-inlet and two-outlet type.

3. The wastewater treatment plant reclaimed water source heat pump cascade utilization process according to claim 2, characterized in that: The minimum water temperature set by the water source heat pump (3) is 7°C or the maximum water temperature is 32°C. After the water source heat pump (3) takes energy, when the return water temperature is higher than 7°C or lower than 32°C, the three-way solenoid valve (11) can ensure that the return water pipe (9) is open under the premise of controlling the discharge pipe (10) to be closed. When the return water temperature is lower than 7°C or higher than 32°C, the three-way solenoid valve (11) can ensure that the return water pipe (9) is closed under the premise of controlling the discharge pipe (10) to be open.

4. The wastewater treatment plant reclaimed water source heat pump return water cascade utilization process according to claim 3, characterized in that: The heat dissipation box (6) includes several heat dissipation plates (12) and two connecting plates (13). The heat dissipation plates (12) and the connecting plates (13) are hollow. The heat dissipation plates (12) are evenly distributed horizontally. The two connecting plates (13) are symmetrically connected between the two sides of the heat dissipation plates (12). The interior of the heat dissipation plates (12) is connected to the interior of the connecting plates (13). The two connecting plates (13) are connected to a connecting pipe (14) on the opposite side. The two connecting pipes (14) are respectively connected between the water inlet pipe (4) and the water source heat pump (3). A second thermometer (15) for measuring the temperature of reclaimed water is installed on the connecting pipe (14) near the water inlet pump (2).

5. The wastewater treatment plant reclaimed water source heat pump return water cascade utilization process according to claim 4, characterized in that: The sealing assembly includes a movable plate (16), a limiting rod (17), a guide rod (18), and a pushing component. There are two movable plates (16), which are vertically symmetrically distributed. The length of the movable plate (16) matches the length of the heat sink (6), and the width of the movable plate (16) is equal to half the height of the heat sink (6). The movable plate (16) has several strip-shaped through holes (19) along its front and rear sides. When the movable plate (16) is in a vertical state, the multiple strip-shaped through holes (19) are respectively aligned with and close to the front or rear sides of the multiple heat sinks (12). The limiting rod (17) is rotatably connected to the positions on both sides of the movable plate (16). Located on the side where the two movable plates (16) are separated, the limiting rod (17) is horizontally and vertically slidably inserted into the front or rear side of the insulation board (7). The guide rod (18) is horizontally inserted into the side of the movable plate (16) away from the limiting rod (17) along both sides. The guide rod (18) is symmetrically provided with fixing strips (20) at both ends. The fixing strips (20) are fixedly connected to the connecting plate (13) facing each other. Vertical guide grooves (21) are opened on the side of the two fixing strips (20) facing each other. The two ends of the guide rod (18) are slidably installed in the two guide grooves (21). The pushing member is connected to the side of the movable plate (16) near the limiting rod (17) and is used to push the movable plate (16) to tilt it.

6. The wastewater treatment plant reclaimed water source heat pump cascade utilization process according to claim 5, characterized in that: The pusher includes an electric push rod (22) and a connecting block (23). The electric push rod (22) is horizontally installed on one side of the two insulation boards (7) that are away from each other. The connecting block (23) is fixedly connected to the side of the movable plate (16) near the limiting rod (17). The output end of the electric push rod (22) is hinged to the connecting block (23) facing it.

7. The wastewater treatment plant reclaimed water source heat pump cascade utilization process according to claim 6, characterized in that: Rubber sealing gaskets (24) are fixedly connected to the front and rear sides of the heat dissipation plate (12) and the insulation plate (7). The area of ​​the sealing gasket (24) is larger than the area of ​​the strip-shaped through hole (19). When the movable plate (16) is in a vertical state, the sealing gasket (24) can fit together with the movable plate (16). When the movable plate (16) is in a final tilted state under the action of the electric push rod (22), the multiple strip-shaped through holes (19) on the movable plate (16) can be aligned with the gap between two adjacent heat dissipation plates (12).

8. The wastewater treatment plant reclaimed water source heat pump return water cascade utilization process according to claim 7, characterized in that: Both the insulation board (7) and the movable board (16) are hollow designs, and both the insulation board (7) and the movable board (16) are filled with an insulation core.

9. The wastewater treatment plant reclaimed water source heat pump cascade utilization process according to claim 8, characterized in that: The top and bottom of the heat sink (12) are provided with a number of heat dissipation strips (25), and the length direction of the heat dissipation strips (25) is perpendicular to the front side of the heat sink (12).

10. The wastewater treatment plant reclaimed water source heat pump cascade utilization process according to claim 9, characterized in that: The top surface of the heat sink (12) gradually increases from the front and rear sides to the middle, and the top surface of the heat sink (12) is designed with an arc.

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