Sewage heat recovery heating system of magnetic suspension heat pump
By combining a magnetic levitation heat pump with a two-stage plate heat exchanger, the problems of easy scaling, pollution, and low efficiency at low temperatures in wastewater waste heat recovery systems are solved. This achieves efficient, stable, and economical wastewater heat recovery heating, reduces operating energy consumption and maintenance costs, and extends equipment life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LEITZ INTELLIGENT EQUIP (GUANGDONG) CO LTD
- Filing Date
- 2025-05-08
- Publication Date
- 2026-05-12
AI Technical Summary
In existing wastewater heat recovery systems, shell-and-tube heat exchangers are prone to scaling, plate heat exchangers are prone to contamination, traditional heat pump equipment is sensitive to impurities in wastewater, and has low efficiency, high operating costs, large mechanical friction losses, and high noise levels in low-temperature environments. Absorption heat pumps have high initial investment and operating energy consumption, and require high system stability.
The system employs a magnetic levitation heat pump and a two-stage plate heat exchanger recovery unit to form a continuous heat circulation loop. Through multiple heat exchanges, the system improves the utilization rate of thermal energy. The magnetic levitation technology reduces mechanical friction, and the plate heat exchanger recovery unit provides tiered treatment to reduce equipment corrosion and scaling. Intelligent water circuit control ensures stable operation.
It achieves efficient, stable, and economical wastewater heat recovery heating, reduces maintenance frequency and operating costs, improves COP, reduces pollution and greenhouse gas emissions, and extends equipment life.
Smart Images
Figure CN224230376U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of heat pump wastewater heat recovery systems, and in particular to a magnetic levitation heat pump wastewater heat recovery heating system. Background Technology
[0002] In recent years, with the increasing requirements for energy conservation, emission reduction and environmental protection, traditional waste heat recovery systems usually use conventional heat pumps or other heat exchange devices. Urban sewage, industrial wastewater and domestic wastewater contain a large amount of reusable low-temperature waste heat. If it can be effectively recovered and used for heating, it can significantly reduce the energy consumption of traditional coal and gas heating, improve energy utilization efficiency, and reduce greenhouse gas emissions.
[0003] In the field of wastewater waste heat recovery, existing technologies include shell-and-tube heat exchangers and plate heat exchangers. Shell-and-tube heat exchangers utilize indirect heat exchange between wastewater and the heat medium to achieve preliminary heat energy recovery. However, the tubes are prone to scaling due to suspended particles in the wastewater, leading to decreased heat exchange efficiency and high long-term operation and maintenance costs. Plate heat exchangers, on the other hand, are widely used in wastewater waste heat recovery systems due to their compact structure and high heat exchange efficiency. Plate heat exchangers are easy to disassemble and clean, but they also face the problem of plate surface contamination caused by impurities in the wastewater, requiring regular maintenance and design optimization. Traditional vapor compression heat pumps: These use a compressor cycle principle to absorb low-temperature heat energy from wastewater and release high-temperature heat energy after compression, commonly used for heating and hot water preheating. Although they have high thermal efficiency, the equipment is sensitive to impurities in the wastewater, which may lead to system wear and reduced energy efficiency. Absorption heat pumps utilize the absorption and desorption process between the absorbent and the working fluid for heat energy conversion, suitable for waste heat utilization. Although the system structure is relatively simple, the initial investment and operating energy consumption are high, and the requirements for system stability are high. Meanwhile, in low-temperature wastewater environments, the efficiency of traditional heat pumps decreases significantly, especially in winter or low-temperature regions, resulting in lower COP (coefficient of performance) and higher operating costs. The compressor also suffers from mechanical friction losses and generates considerable operating noise, impacting the equipment's economic viability and lifespan. Utility Model Content
[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a sewage heat recovery heating system based on a magnetic levitation heat pump.
[0005] The technical solution adopted by this utility model to solve its technical problem is: a sewage heat recovery heating system of magnetic levitation heat pump, including a sewage tank and a heat exchange station. The heat exchange station includes a magnetic levitation heat pump unit and a plate heat exchange recovery group. The sewage tank is connected to the magnetic levitation heat pump unit. The magnetic levitation heat pump unit includes a first magnetic levitation heat pump and a second magnetic levitation heat pump. The first magnetic levitation heat pump is connected to the second magnetic levitation heat pump.
[0006] As a further improvement of this utility model: the evaporator outlet pipe of the first magnetic levitation heat pump is connected to the evaporator inlet of the second magnetic levitation heat pump.
[0007] As a further improvement of this utility model: the evaporator outlet pipe of the second magnetic levitation heat pump is connected to the sewage tank to form a heat circulation loop.
[0008] As a further improvement of this utility model: a water pump unit is provided on the connecting pipe between the sewage tank and the magnetic levitation heat pump unit.
[0009] As a further improvement of this utility model: the plate heat exchanger recovery group includes a first plate heat exchanger group and a second plate heat exchanger group, wherein the first plate heat exchanger group and the second plate heat exchanger group are connected in series.
[0010] As a further improvement of this utility model: the first plate heat exchanger group includes a first water supply tank, a first pre-plate heat exchanger circulation pump, and a first plate heat exchanger circulation pump. The first water supply tank is connected to the first pre-plate heat exchanger circulation pump, and the first pre-plate heat exchanger circulation pump is connected to the first plate heat exchanger circulation pump.
[0011] As a further improvement of this utility model: the condensate pipe of the first pre-plate heat exchanger circulation pump is connected to the water supply tank, the condensate of the first pre-plate heat exchanger circulation pump returns to the water supply tank, and after heat exchange by the first pre-plate heat exchanger circulation pump, it enters the first plate heat exchanger circulation pump for heat exchange again.
[0012] As a further improvement of this utility model: the second plate heat exchanger group includes a second water supply tank, a second pre-plate heat exchanger circulation pump, and a second plate heat exchanger circulation pump. The second water supply tank is connected to the second pre-plate heat exchanger circulation pump, and the second pre-plate heat exchanger circulation pump is connected to the second plate heat exchanger circulation pump.
[0013] As a further improvement of this utility model: the condensate pipe of the second pre-plate heat exchanger circulation pump is connected to the water supply tank, the condensate of the second pre-plate heat exchanger circulation pump returns to the water supply tank, and after heat exchange by the second pre-plate heat exchanger circulation pump, it enters the second plate heat exchanger circulation pump for heat exchange again.
[0014] As a further improvement of this utility model: the first water supply tank is connected to the heating output pipe, and the second water supply tank is connected to the heating output pipe.
[0015] As a further improvement of this utility model: the first water supply tank and the second water supply tank are connected to the return pipe, and the return pipe is connected to the condenser inlet of the first magnetic levitation heat pump and the second magnetic levitation heat pump to form a condensation heat exchange loop.
[0016] As a further improvement of this utility model: the sewage tank is connected to the overflow pipe, and the overflow pipe is equipped with an overflow valve A.
[0017] As a further improvement of this utility model: an electromagnetic valve C is provided on the connecting pipe between the evaporator outlet pipe and the sewage tank of the second magnetic levitation heat pump.
[0018] As a further improvement of this utility model: an electromagnetic valve B is provided between the evaporator outlet pipe of the second magnetic levitation heat pump and the connecting pipe of the sewage tank and the overflow pipe.
[0019] Compared with the prior art, the beneficial effects of this utility model are:
[0020] By connecting the first and second magnetic levitation heat pumps in series, a continuous heat circulation loop is formed, allowing for the full extraction of low-temperature waste heat from the sewage. A two-stage plate heat exchanger recovery unit is employed, with multiple heat exchanges improving heat energy utilization and ensuring stable and reliable heating output temperature. Magnetic levitation technology reduces mechanical friction and energy consumption, significantly improving the COP (coefficient of performance) of the heat pumps and achieving low-energy operation. The design of the plate heat exchanger recovery unit and the water supply tank enables graded heat exchange, reducing direct corrosion and scaling of the equipment by sewage, thereby lowering maintenance frequency and operating costs. Through multi-stage heat recovery and intelligent water circuit control, an efficient, stable, and economical sewage heat recovery heating effect is achieved overall. Attached Figure Description
[0021] To more clearly illustrate the technical solution, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the structure of this utility model.
[0023] Figure 2 This is a schematic diagram of the heat exchange station part of this utility model.
[0024] Figure 3 This is a partial structural schematic diagram of the heat exchange station of this utility model.
[0025] Figure 4 This is a partial structural schematic diagram of the present invention.
[0026] Figure label:
[0027] 1. Wastewater tank; 2. Heat exchange station; 3. Magnetic levitation heat pump unit; 4. Plate heat exchanger recovery unit; 5. Water pump unit; 6. Heating output pipe; 7. Overflow valve A; 8. Solenoid valve C; 9. Solenoid valve B; 31. First magnetic levitation heat pump; 32. Second magnetic levitation heat pump; 311. Evaporator outlet pipe of the first magnetic levitation heat pump; 321. Evaporator inlet of the second magnetic levitation heat pump; 41. First plate heat exchanger unit; 42. Second plate heat exchanger unit; 411. First makeup water tank; 412. First pre-plate heat exchanger circulation pump; 413. First plate heat exchanger circulation pump; 421. Second makeup water tank; 422. Second pre-plate heat exchanger circulation pump; 423. Second plate heat exchanger circulation pump. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0031] Existing shell-and-tube heat exchangers: Suspended particles, grease, and other impurities in wastewater easily adhere to the inner walls of the tubes, forming scale, which significantly reduces heat exchange efficiency. Furthermore, scale buildup increases the frequency and cost of cleaning and maintenance, making long-term operational stability difficult to guarantee. Plate heat exchangers: Although compact in structure, have high heat exchange efficiency, and are easy to disassemble and clean, the small gaps between plates allow impurities in wastewater to easily deposit on the plate surfaces, leading to reduced heat exchange performance. Regular cleaning and design optimization are essential; otherwise, long-term use may affect the overall system performance and reliability. Vapor compression heat pumps: These use a compressor to extract low-temperature heat energy from wastewater through circulation. While they have high thermal efficiency, the equipment is extremely sensitive to impurities in the wastewater. Suspended solids and corrosive components in wastewater can cause equipment wear, reducing system lifespan and energy efficiency. Simultaneously, the compressor experiences significant energy loss due to mechanical friction during operation and generates considerable noise, negatively impacting the environment and equipment economy. Absorption heat pumps: Although relatively simple in structure and their heat conversion principle is suitable for waste heat utilization, their initial investment is high, and their operating energy consumption is also high. In addition, the system has high requirements for the stability of operating conditions, and its thermal efficiency drops significantly in low-temperature wastewater environments, making it difficult to achieve the expected energy-saving effect in practical applications.
[0032] To address the problems in existing technologies, this utility model provides a wastewater heat recovery heating system using a magnetic levitation heat pump. Through multiple heat exchanges, it improves heat energy utilization and ensures a stable and reliable heating output temperature. The present utility model will now be further described in conjunction with the accompanying drawings and embodiments: Figures 1-4 The wastewater heat recovery heating system of magnetic levitation heat pump shown includes a wastewater tank 1 and a heat exchange station 2. The heat exchange station 2 includes a magnetic levitation heat pump unit 3 and a plate heat exchange recovery unit 4. The wastewater tank 1 is connected to the magnetic levitation heat pump unit 3. The magnetic levitation heat pump unit 3 includes a first magnetic levitation heat pump 31 and a second magnetic levitation heat pump 32. The first magnetic levitation heat pump 31 is connected to the second magnetic levitation heat pump 32.
[0033] Through magnetic levitation heat pump technology, the system can fully utilize the low-temperature waste heat in sewage to achieve efficient heat energy extraction and conversion. The series connection between the first magnetic levitation heat pump 31 and the second magnetic levitation heat pump 32 forms a continuous heat exchange loop, further improving the heat recovery rate. The magnetic levitation heat pump adopts non-contact magnetic levitation bearings, which effectively reduces mechanical friction and energy loss, significantly improves the system's coefficient of performance (COP), and reduces operating energy consumption. By recovering waste heat from sewage for heating, it can reduce pollution and greenhouse gas emissions caused by traditional coal and gas heating, meeting the requirements of energy conservation, emission reduction, and environmental protection. Magnetic levitation technology reduces mechanical wear, enabling the heat pump unit to maintain stable operation in a low-temperature sewage environment and extending the service life of the equipment. The effective connection between the plate heat exchanger recovery group 4 and the sewage tank 1 ensures the continuity and stability of the heat exchange process, reducing the risk of blockage and maintenance caused by sewage impurities.
[0034] In one embodiment of this utility model: the evaporator outlet pipe 311 of the first magnetic levitation heat pump is connected to the evaporator inlet 321 of the second magnetic levitation heat pump; the evaporator outlet pipe of the second magnetic levitation heat pump 32 is connected to the sewage tank 1 to form a heat circulation loop.
[0035] The series configuration of two-stage heat pumps enables the multiple extraction and utilization of low-temperature waste heat in sewage, realizing cascaded heat recovery and improving the overall heat recovery efficiency of the system. By forming a stable heat circulation loop, heat energy can be recycled within the system, reducing energy waste caused by heat loss and thus reducing operating energy consumption. It also makes full use of waste heat in sewage, reducing reliance on traditional coal and gas heating and lowering energy consumption and greenhouse gas emissions.
[0036] In one embodiment of this utility model: a water pump group 5 is installed on the connecting pipe between the sewage tank 1 and the magnetic levitation heat pump unit 3. The water pump group 5 includes a main water pump and a standby water pump, and the water pump has a power of 7.5KW and a flow rate of 80m³ / h. 3 / h head 24 meters.
[0037] The combined design of the main and standby water pumps ensures that the system can maintain normal water flow even if either pump fails, preventing interruptions in water flow from affecting heat exchange efficiency and the continuous operation of the heating system; 7.5KW power, 80m 3 The flow rate of / h and the head of 24 meters can fully meet the system's requirements for water flow and pressure, ensuring that the sewage can circulate efficiently within the heat pump unit, thereby achieving efficient heat transfer and full utilization of waste heat.
[0038] One embodiment of this utility model: The plate heat exchanger recovery group 4 includes a first plate heat exchanger group 41 and a second plate heat exchanger group 42, which are connected in series. The first plate heat exchanger group 41 includes a first water supply tank 411, a first pre-plate heat exchanger circulation pump 412, and a first plate heat exchanger circulation pump 413. The first water supply tank 411 is connected to the first pre-plate heat exchanger circulation pump 412, and the first pre-plate heat exchanger circulation pump 412 is connected to the first plate heat exchanger circulation pump 413. The condensate pipe of the first pre-plate heat exchanger circulation pump 412 is connected to the water supply tank, and the condensate from the first pre-plate heat exchanger circulation pump 412 returns to the water supply tank. After heat exchange, the condensate from the first pre-plate heat exchanger circulation pump 412 enters the first plate heat exchanger circulation pump 413 for further heat exchange. The condensate pipe of the second pre-plate heat exchanger circulation pump 422 is connected to the water supply tank, and the condensate from the second pre-plate heat exchanger circulation pump 422 returns to the water supply tank. After heat exchange, the condensate from the second pre-plate heat exchanger circulation pump 422 enters the second plate heat exchanger circulation pump 423 for further heat exchange. The second plate heat exchanger group 42 includes a second water supply tank 421, a second pre-plate heat exchanger circulation pump 422, and a second plate heat exchanger circulation pump 423. The second water supply tank 421 is connected to the second pre-plate heat exchanger circulation pump 422, and the second pre-plate heat exchanger circulation pump 422 is connected to the second plate heat exchanger circulation pump 423.
[0039] The first plate heat exchanger group 41 and the second plate heat exchanger group 42 are connected in series, enabling heat energy to undergo two-stage exchange, fully utilizing the waste heat in the sewage, and achieving step-by-step extraction and utilization of heat. In each stage of plate heat exchange, the pre-plate heat exchanger circulation pump returns condensate to the makeup water tank, participating in the heat exchange process again, effectively reducing heat energy waste, while ensuring sufficient water volume in the system to maintain heat exchange efficiency. The cascaded cooperation of the pre-plate heat exchanger circulation pump and the plate heat exchanger circulation pump makes the heat exchange process continuous and stable, capable of responding quickly to temperature changes and maintaining high-efficiency operation for extended periods. Through multiple heat exchange and circulating water replenishment design, the overall energy utilization rate of the system is significantly improved, reducing dependence on external heat sources, thereby reducing operating energy consumption and maintenance costs.
[0040] In one embodiment of this utility model: the first water supply tank 411 is connected to the heating output pipe 66, and the second water supply tank 421 is connected to the heating output pipe 66; by directly connecting the two-stage water supply tanks to the heating output pipe 6, it is ensured that the heat energy after multi-stage heat exchange in the plate heat exchange recovery group 4 can be quickly and efficiently transferred to the heating system, thereby improving the overall heat energy utilization efficiency; after condensation and heat exchange, the water in the water supply tank has a stable temperature, and direct connection with the heating pipe can ensure a balanced distribution of heating water temperature and improve the heating effect.
[0041] In one embodiment of this utility model: the first water supply tank 411 and the second water supply tank 421 are connected to a return pipe, which is connected to the condenser inlets of the first magnetic levitation heat pump 31 and the second magnetic levitation heat pump 32, forming a condensation heat exchange loop. The return pipe collects and recycles the condensate after heat exchange and supplies it directly to the condenser inlet, ensuring that the heat energy is fully utilized within the system and improving the condensation heat exchange efficiency. The closed loop allows the condensate to be continuously recycled, reducing heat loss and effectively recovering and reusing waste heat, further improving the overall system energy efficiency. By having the returned condensate directly participate in the next round of heat exchange, the dependence on external heat sources is reduced, achieving low-energy operation and lowering the system's operating costs. The closed-loop design helps maintain the balance of water flow and temperature within the system, ensuring that the magnetic levitation heat pump operates efficiently under stable conditions and extending the equipment's service life.
[0042] In one embodiment of this utility model: the sewage tank 1 is connected to an overflow pipe, and an overflow valve A7 is provided on the overflow pipe; an electromagnetic valve C8 is provided on the connecting pipe between the evaporator outlet pipe of the second magnetic levitation heat pump 32 and the sewage tank 1; an electromagnetic valve B9 is provided between the connecting pipe between the evaporator outlet pipe of the second magnetic levitation heat pump 32 and the sewage tank 1 and the overflow pipe; when the overflow valve A7 is open, the electromagnetic valve B9 is open and the electromagnetic valve C8 is closed; when the overflow valve A7 is closed, both the electromagnetic valves B9 and C8 are closed, and the main unit and water pump are shut down after 5 minutes in this state. When the water level in the sewage tank 1 rises abnormally and triggers the opening of the overflow valve A7, the system automatically opens the electromagnetic valve B9 and closes the electromagnetic valve C8 through linkage control, effectively directing excess water to the overflow pipe and preventing the sewage tank 1 from overflowing or the water level from being too high, which could cause abnormal system operation; when the overflow valve A7 is closed, i.e., the water level returns to normal, both the electromagnetic valves B9 and C8 remain closed, and the main unit and water pump are automatically shut down after a 5-minute delay. To ensure that the equipment can stop operating in a timely manner when abnormal conditions occur during the wastewater recycling process, and to avoid equipment damage caused by water level fluctuations or overflows; the strategy of automatically delaying the shutdown of the main unit and water pumps helps to reduce energy consumption when continuous operation is not required, while also protecting the equipment from unnecessary wear and tear, and improving the overall operational stability and service life of the system.
[0043] In one embodiment of this utility model: the sewage tank 1 is connected to the outdoor water tank 11, and the sewage first enters the outdoor water tank 11 and then enters the heat exchange station 2.
[0044] In summary, any other corresponding modifications made by those skilled in the art after reading this utility model document, based on the technical solution and concept of this utility model without creative mental effort, shall all fall within the scope of protection of this utility model.
Claims
1. A wastewater heat recovery heating system using a magnetic levitation heat pump, characterized in that, It includes a sewage tank and a heat exchange station. The heat exchange station includes a magnetic levitation heat pump unit and a plate heat exchange recovery unit. The sewage tank is connected to the magnetic levitation heat pump unit. The magnetic levitation heat pump unit includes a first magnetic levitation heat pump and a second magnetic levitation heat pump. The first magnetic levitation heat pump is connected to the second magnetic levitation heat pump.
2. The wastewater heat recovery heating system of a magnetic levitation heat pump according to claim 1, characterized in that, The evaporator outlet pipe of the first magnetic levitation heat pump is connected to the evaporator inlet of the second magnetic levitation heat pump.
3. A wastewater heat recovery heating system based on a magnetic levitation heat pump according to claim 2, characterized in that, The evaporator outlet pipe of the second magnetic levitation heat pump is connected to the sewage tank to form a heat circulation loop.
4. A wastewater heat recovery heating system based on a magnetic levitation heat pump according to claim 1, characterized in that, A water pump unit is installed on the connecting pipe between the sewage tank and the magnetic levitation heat pump unit.
5. A wastewater heat recovery heating system based on a magnetic levitation heat pump according to claim 1, characterized in that, The plate heat exchanger recovery group includes a first plate heat exchanger group and a second plate heat exchanger group, which are connected in series.
6. A wastewater heat recovery heating system based on a magnetic levitation heat pump according to claim 5, characterized in that, The first plate heat exchanger group includes a first water supply tank, a first pre-plate heat exchanger circulation pump, and a first plate heat exchanger circulation pump. The first water supply tank is connected to the first pre-plate heat exchanger circulation pump, and the first pre-plate heat exchanger circulation pump is connected to the first plate heat exchanger circulation pump.
7. A wastewater heat recovery heating system based on a magnetic levitation heat pump according to claim 6, characterized in that, The second plate heat exchanger group includes a second water supply tank, a second pre-plate heat exchanger circulation pump, and a second plate heat exchanger circulation pump. The second water supply tank is connected to the second pre-plate heat exchanger circulation pump, and the second pre-plate heat exchanger circulation pump is connected to the second plate heat exchanger circulation pump.
8. A wastewater heat recovery heating system based on a magnetic levitation heat pump according to claim 7, characterized in that, The first and second water supply tanks are connected to the return pipe, which is connected to the condenser inlet of the first and second magnetic levitation heat pumps, forming a condensation heat exchange loop.
9. A wastewater heat recovery heating system based on a magnetic levitation heat pump according to claim 4, characterized in that, The sewage tank is connected to an overflow pipe, and an overflow valve A is installed on the overflow pipe.
10. A wastewater heat recovery heating system based on a magnetic levitation heat pump according to claim 3, characterized in that, The second magnetic levitation heat pump has an electromagnetic valve C installed on the connection pipe between the evaporator outlet pipe and the sewage tank.