High-efficiency large-temperature-difference sewage waste heat recovery device

Abstract

The utility model discloses a kind of high-efficiency large temperature difference sewage waste heat recovery devices, it is related to high-temperature sewage recycling field, including primary heat exchanger and heat pump unit;Primary heat exchanger includes first sewage inlet, first sewage outlet, first clean water inlet and first clean water outlet, first sewage inlet and first sewage outlet are communicated to form sewage area in primary heat exchanger, first clean water inlet and first clean water outlet are communicated to form clean water area in primary heat exchanger, and sewage area and clean water area are two spaces not communicated each other;First sewage outlet is communicated with the heat-releasing water inlet of heat pump unit, and first clean water outlet is communicated with the heat-absorbing water inlet of heat pump unit.The utility model provides a kind of high-efficiency large temperature difference sewage waste heat recovery device, let high-temperature sewage carry out twice heat exchange, effectively heat in high-temperature sewage is used for the heating of clean water, avoid the waste of heat in high-temperature sewage, reduce the heating cost of high-temperature clean water.

Description

Technical Field

[0001] This utility model relates to the field of high-temperature wastewater reuse, and in particular to a high-efficiency wastewater waste heat recovery device with a large temperature difference. Background Technology

[0002] Some existing industrial production processes face a situation where "large amounts of high-temperature wastewater containing impurities are discharged while a large amount of high-temperature clean water is needed." This problem is common in dairy, food, chemical, and semiconductor manufacturing companies. A traditional process discharges high-temperature wastewater containing impurities at 50-70℃, while simultaneously requiring a large amount of high-temperature clean water at 80-90℃. Directly discharging the 50-70℃ wastewater into on-site wastewater treatment equipment is problematic because the high temperature affects the activity of microorganisms in the wastewater treatment process and also wastes a significant amount of heat. Meanwhile, high-temperature clean water is typically heated using high-temperature steam produced by boilers, requiring a large amount of steam and resulting in high energy costs for the companies. Utility Model Content

[0003] The purpose of this invention is to provide a high-efficiency wastewater waste heat recovery device with a large temperature difference, in order to solve the problems existing in the prior art. It allows high-temperature wastewater to undergo two heat exchanges, effectively using the heat in the high-temperature wastewater for heating clean water, avoiding the waste of heat in the high-temperature wastewater and reducing the heating cost of high-temperature clean water.

[0004] To achieve the above objectives, this utility model provides the following solution:

[0005] This utility model provides a high-efficiency waste heat recovery device for large temperature difference sewage, including a primary heat exchanger and a heat pump unit. The primary heat exchanger includes a first sewage inlet, a first sewage outlet, a first clean water inlet, and a first clean water outlet. The first sewage inlet and the first sewage outlet are connected within the primary heat exchanger to form a sewage zone, and the first clean water inlet and the first clean water outlet are connected within the primary heat exchanger to form a clean water zone. The sewage zone and the clean water zone are two separate spaces. The first sewage outlet is connected to the hot water outlet of the heat pump unit, and the first clean water outlet is connected to the hot water inlet of the heat pump unit.

[0006] In one embodiment, the heat pump unit includes a circulating heat exchange pipeline containing a heat exchange solvent, an expansion valve, a compressor, a heat release zone, and a heat absorption zone. The expansion valve and the compressor are both located on the circulating heat exchange pipeline. The heat release zone is located on the pipe section between the outlet of the expansion valve and the inlet of the compressor. The heat absorption zone is located on the pipe section between the outlet of the compressor and the inlet of the expansion valve. Both the heat release zone and the heat absorption zone are sealed structures. The inlet of the heat release zone is a hot water inlet, and the inlet of the heat absorption zone is a hot water inlet.

[0007] In one embodiment, the section of the circulating heat exchange pipeline in the heat release zone has a spiral structure, and the section of the circulating heat exchange pipeline in the heat absorption zone has a spiral structure.

[0008] In one embodiment, the system further includes a waste heat recycling device, which includes a second wastewater inlet, a second wastewater outlet, a circulation outlet, and a circulation inlet. The second wastewater inlet is connected to the first wastewater outlet. The circulation outlet is connected to the hot water outlet of the heat pump unit, and the circulation inlet is connected to the hot water outlet of the heat pump unit. A circulation pressurization device is provided on the pipe section connecting the waste heat recycling device and the heat pump unit.

[0009] In one embodiment, the circulating pressurization device is a circulating water pump, the inlet of which is connected to the hot water outlet of the heat pump unit, and the outlet of which is connected to the circulating inlet.

[0010] In one embodiment, the primary heat exchanger is a wide-channel stainless steel wastewater heat exchanger, which includes a hot water chamber and a hot water exchange pipe. The inlet of the hot water chamber is the first wastewater inlet, and the outlet of the hot water chamber is the first wastewater outlet. The inlet of the hot water exchange pipe is the first clean water inlet, and the outlet of the hot water exchange pipe is the first clean water outlet. The inlet of the hot water chamber and the outlet of the hot water exchange pipe are located at the first end of the wide-channel stainless steel wastewater heat exchanger, and the outlet of the hot water chamber and the inlet of the hot water exchange pipe are located at the inlet end of the wide-channel stainless steel wastewater heat exchanger.

[0011] In one embodiment, the hot water exchange pipe is a coil.

[0012] In one embodiment, the waste heat recycling device is a wide-channel stainless steel wastewater heat exchanger. The waste heat recycling device includes a circulation chamber, the inlet of the circulation chamber is a second wastewater inlet, the outlet of the circulation chamber is a second wastewater outlet, and the circulation outlet and the circulation inlet are connected to the circulation chamber.

[0013] In one embodiment, the system further includes a steam heater, which is provided with a heating inlet, a heating outlet, a steam inlet, and a condensate outlet. The heating inlet and the heating outlet are connected within the steam heater to form a heating zone, and the steam inlet and the condensate outlet are connected within the steam heater to form a steam heat release zone. The heating zone and the steam heat release zone are two separate spaces. The hot water outlet of the heat pump unit is connected to the heating inlet.

[0014] In one embodiment, the heating inlet and the heating outlet are connected by a heating pipe.

[0015] The present invention achieves the following technical advantages over the prior art:

[0016] This invention provides a high-efficiency wastewater waste heat recovery device with a large temperature difference, allowing high-temperature wastewater to undergo two heat exchanges. This effectively utilizes the heat from the high-temperature wastewater to heat clean water, avoiding heat waste and reducing the heating cost of high-temperature clean water. In the primary heat exchanger, the wastewater temperature is much higher than the clean water temperature, allowing for spontaneous heat exchange without additional assistance. After the first heat exchange, the wastewater temperature decreases, making natural heat exchange ineffective. The heat pump unit utilizes the reverse Carnot cycle principle to transfer heat from a low-temperature heat source to a high-temperature heat source. In this invention, the exothermic wastewater serves as the low-temperature heat source, and the first-heated clean water serves as the high-temperature heat source. The heat pump unit further transfers the remaining heat from the exothermic wastewater to the first-heated clean water, completing a secondary heat exchange and maximizing the heat exchange effect. Through these two heat exchanges, the goal of heating low-temperature clean water with high-temperature wastewater is achieved. The heat in the wastewater is rationally utilized, and the significant temperature reduction of the wastewater after heat exchange does not kill the microorganisms used in wastewater treatment, while also significantly reducing the energy consumption for heating clean water. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the 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.

[0018] Figure 1 This is a schematic diagram illustrating the connection relationship between a primary heat exchanger and a heat pump unit in one embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram showing the connection relationship of a primary heat exchanger, a heat pump unit, and a waste heat recycling device in one embodiment of the present utility model.

[0020] Figure 3 This is a schematic diagram showing the connection relationship of a primary heat exchanger, a heat pump unit, a waste heat recycling device, and a steam heater in one embodiment of the present utility model.

[0021] Figure 4 This is a schematic diagram of the internal structure of a primary heat exchanger in an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the internal structure of a waste heat recycling device according to an embodiment of the present invention.

[0023] Among them, 1 is the primary heat exchanger; 101 is the first sewage inlet; 102 is the first sewage outlet; 103 is the first clean water inlet; 104 is the first clean water outlet; 105 is the hot water chamber; and 106 is the hot water exchange pipe.

[0024] 2. Heat pump unit; 201. Circulating heat exchange piping; 202. Expansion valve; 203. Compressor; 204. Heat release zone; 205. Heat absorption zone;

[0025] 3. Waste heat recycling device; 301. Second wastewater inlet; 302. Second wastewater outlet; 303. Circulation outlet; 304. Circulation inlet; 305. Circulation chamber;

[0026] 4. Circulating pressurization device;

[0027] 5. Steam heater; 501. Heating inlet; 502. Heating outlet; 503. Steam inlet; 504. Condensate outlet. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0029] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the implementation of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed herein. In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are merely for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Therefore, features specified with "first," "second," etc., may explicitly or implicitly include one or more of those features. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0030] It should also be noted that in the embodiments of this application, the same reference numerals are used to denote the same component or the same part.

[0031] The purpose of this invention is to provide a high-efficiency wastewater waste heat recovery device with a large temperature difference, in order to solve the problems existing in the prior art. It allows high-temperature wastewater to undergo two heat exchanges, effectively using the heat in the high-temperature wastewater for heating clean water, avoiding the waste of heat in the high-temperature wastewater and reducing the heating cost of high-temperature clean water.

[0032] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1-5 As shown, this utility model provides a high-efficiency wastewater waste heat recovery device with a large temperature difference, including a primary heat exchanger 1 and a heat pump unit 2. The primary heat exchanger 1 includes a first wastewater inlet 101, a first wastewater outlet 102, a first clean water inlet 103, and a first clean water outlet 104. The first wastewater inlet 101 and the first wastewater outlet 102 are connected within the primary heat exchanger 1 to form a wastewater zone, and the first clean water inlet 103 and the first clean water outlet 104 are connected within the primary heat exchanger 1 to form a clean water zone. The wastewater zone and the clean water zone are two separate spaces. The first wastewater outlet 102 is connected to the hot water outlet of the heat pump unit 2, and the first clean water outlet 104 is connected to the hot water intake inlet of the heat pump unit 2.

[0034] Working principle:

[0035] This utility model provides a high-efficiency wastewater waste heat recovery device with a large temperature difference, enabling wastewater and clean water to undergo two heat exchanges. The first heat exchange takes place in a primary heat exchanger 1. High-temperature wastewater enters the wastewater zone through the first wastewater inlet 101, while low-temperature clean water enters the clean water zone through the first clean water inlet 103. Due to the large temperature difference, the high-temperature wastewater spontaneously transfers heat to the low-temperature clean water. The wastewater zone and the clean water zone are not interconnected, ensuring that the wastewater and clean water do not mix. After the first heat exchange, the high-temperature wastewater becomes cooled wastewater, and the low-temperature clean water becomes heated clean water. The spontaneous heat exchange effect decreases sharply, but the cooled wastewater still contains unused heat, thus requiring a second heat exchange. The second heat exchange uses a heat pump unit 2 as the heat exchange device, which transfers heat from a low-temperature heat source to a high-temperature heat source. In the second heat exchange, the cooled wastewater is the low-temperature heat source, and the heated clean water is the high-temperature heat source. The cooled wastewater and heated clean water are respectively input into the heat pump unit 2 to complete the second heat exchange. After two heat exchanges, the heat in the high-temperature wastewater is fully utilized, resulting in wastewater with a suitable temperature that does not affect the activity of microorganisms in the wastewater treatment process. The original low-temperature clean water can also be heated to a higher temperature without an additional heat source, reducing the energy consumption for heating clean water.

[0036] In one embodiment, the heat pump unit 2 includes a circulating heat exchange pipeline 201 containing a heat exchange solvent, an expansion valve 202, a compressor 203, a heat release zone 204, and a heat absorption zone 205. The expansion valve 202 and compressor 203 are both located on the circulating heat exchange pipeline 201. The heat release zone 204 is located on the pipeline section between the outlet of the expansion valve 202 and the inlet of the compressor 203. The heat absorption zone 205 is located on the pipeline section between the outlet of the compressor 203 and the inlet of the expansion valve 202. Both the heat release zone 204 and the heat absorption zone 205 are sealed structures. The inlet of the heat release zone 204 is a hot water inlet, and the inlet of the heat absorption zone 205 is a hot water inlet. The heat exchange solvent in the circulating heat exchange pipeline 201 absorbs heat from the cooling wastewater in the heat release zone 204 and releases heat to the heated clean water in the heat absorption zone 205. Before entering the heat release zone 204 after leaving the expansion valve 202, the heat exchange solvent is low-temperature, low-pressure steam. Upon entering the heat release zone 204, the steam absorbs heat, heats up, and vaporizes. After leaving the heat release zone 204, the hot steam enters the compressor 203, generating high-temperature, high-pressure gas (gas temperature higher than the heated water). This high-temperature, high-pressure gas then enters the heat absorption zone 205, where the heated water absorbs heat and heats up further. The released high-temperature, high-pressure gas becomes low-temperature, high-pressure gas, which then enters the expansion valve 202 to generate low-temperature, low-pressure wet steam for the next round of heat absorption and release. This process is repeated cyclically, achieving continuous secondary heat exchange. Preferably, the cooling wastewater directly contacts the pipe section in the heat release zone 204, and the heated water directly contacts the pipe section in the heat absorption zone 205.

[0037] In one embodiment, the section of the circulating heat exchange pipe 201 within the heat release zone 204 has a spiral structure, and the section of the circulating heat exchange pipe 201 within the heat absorption zone 205 also has a spiral structure. Given a fixed space, the spiral structure has a larger surface area and a longer distance than the straight pipe structure, thus resulting in a larger effective heat exchange area and a longer heat exchange time.

[0038] In one embodiment, a waste heat recycling device 3 is also included. The waste heat recycling device 3 includes a second wastewater inlet 301, a second wastewater outlet 302, a circulation outlet 303, and a circulation inlet 304. The second wastewater inlet 301 is connected to the first wastewater outlet 102, the circulation outlet 303 is connected to the hot water outlet of the heat pump unit 2, and the circulation inlet 304 is connected to the hot water outlet of the heat pump unit 2. A circulation pressurization device 4 is installed on the pipe section connecting the waste heat recycling device 3 and the heat pump unit 2. The heat release from the cooled wastewater during secondary heat exchange also utilizes the principle of heat exchange, and is therefore affected by various external factors. Performing only one secondary heat exchange may not efficiently utilize the heat in the cooled wastewater, so the cooled wastewater can be circulated into the heat pump unit 2. In this invention, the waste heat recycling device 3 is a container for circulating wastewater. The cooled wastewater obtained from the primary heat exchange first enters the waste heat recycling device 3, and part of the cooled wastewater leaves through the circulation outlet 303 and enters the heat pump unit 2. The cooled wastewater leaving the heat pump unit 2 re-enters the circulation inlet 304, thus achieving circulation. The circulating pressurization device 4 can pressurize the circulating sewage, ensuring that the circulating sewage flowing to the waste heat recycling device 3 can smoothly return to the waste heat recycling device 3. It is understandable that when the volume of high-temperature sewage is large, the waste heat recycling device 3 with limited capacity cannot receive an unlimited amount of cooled sewage from the primary heat exchanger 1. At this time, the second sewage outlet 302 can be opened to discharge sewage. However, even if the second sewage outlet 302 is opened, the sewage circulation between the waste heat recycling device 3 and the heat pump unit 2 can still proceed normally.

[0039] In one embodiment, the wastewater temperature at the first wastewater inlet 101 is 60 degrees Celsius, the wastewater temperature at the first wastewater outlet 102 is 25 degrees Celsius, the clean water temperature at the first clean water inlet 103 is 30 degrees Celsius, the clean water temperature at the first clean water outlet 104 is 55 degrees Celsius, the wastewater temperature at the circulation outlet 303 is 25 degrees Celsius, the temperature at the circulation inlet 304 is 20 degrees Celsius, and the clean water temperature at the outlet of the heat absorption zone 205 is 68 degrees Celsius.

[0040] In one embodiment, the circulating pressurization device 4 is a circulating water pump, with the inlet end of the circulating water pump connected to the hot water outlet of the heat pump unit 2, and the outlet end of the circulating water pump connected to the circulating inlet 304.

[0041] In one embodiment, the primary heat exchanger 1 is a wide-channel stainless steel wastewater heat exchanger. The primary heat exchanger 1 includes a hot water chamber 105 and a hot water exchange pipe 106. The inlet of the hot water chamber 105 is a first wastewater inlet 101, and the outlet of the hot water chamber 105 is a first wastewater outlet 102. The inlet of the hot water exchange pipe 106 is a first clean water inlet 103, and the outlet of the hot water exchange pipe 106 is a first clean water outlet 104. The inlet of the hot water chamber 105 and the outlet of the hot water exchange pipe 106 are located at the first end of the wide-channel stainless steel wastewater heat exchanger, while the outlet of the hot water chamber 105 and the inlet of the hot water exchange pipe 106 are located at the inlet end of the wide-channel stainless steel wastewater heat exchanger. The wide-channel stainless steel wastewater heat exchanger effectively avoids the problem of wastewater impurities clogging the system and is easy to clean and maintain; simply open the heat exchanger cover and rinse with a high-pressure water gun.

[0042] In one embodiment, the hot water exchange pipe 106 is a coil. Given a fixed space, the surface area of ​​a coil is larger and the distance is longer than that of a straight pipe structure, thus resulting in a larger effective heat exchange area and a longer heat exchange time.

[0043] In one embodiment, the waste heat recycling device 3 is a wide-channel stainless steel wastewater heat exchanger. The waste heat recycling device 3 includes a circulation chamber 305, with an inlet 301 (second wastewater inlet) and an outlet 302 (second wastewater outlet). The circulation outlet 303 and circulation inlet 304 connect to the circulation chamber 305. The waste heat recycling device 3 only contains cooled wastewater; therefore... Figure 5 The heat exchange tubes commonly found in heat exchangers are omitted. It is understandable that the circulation outlet 303 and circulation inlet 304 can be independently opened on the outer wall of the wide-channel stainless steel wastewater heat exchanger, or the inlet and outlet of the original heat exchange tubes of the wide-channel stainless steel wastewater heat exchanger can be used. The heat exchange tubes inside the wide-channel stainless steel wastewater heat exchanger can be removed to meet the usage requirements.

[0044] In one embodiment, the present invention further includes a steam heater 5, which is provided with a heating inlet 501, a heating outlet 502, a steam inlet 503, and a condensate outlet 504. The heating inlet 501 and the heating outlet 502 are connected within the steam heater 5 to form a heating zone, and the steam inlet 503 and the condensate outlet 504 are connected within the steam heater 5 to form a steam heat release zone. The heating zone and the steam heat release zone are two separate spaces. The hot water outlet of the heat pump unit 2 is connected to the heating inlet 501. After two heat exchanges, the temperature of the high-temperature clean water may still not reach the specified temperature, therefore further heating is required.

[0045] In one embodiment, the temperature of the clean water at the heating outlet 502 is 80 degrees Celsius.

[0046] In one embodiment, the heating inlet 501 and the heating outlet 502 are connected by a heating pipe.

[0047] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0048] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral forming process).

[0049] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0050] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0051] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0052] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0053] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A high-efficiency wastewater waste heat recovery device with large temperature difference, characterized in that: It includes a primary heat exchanger (1) and a heat pump unit (2); The primary heat exchanger (1) includes a first sewage inlet (101), a first sewage outlet (102), a first clean water inlet (103), and a first clean water outlet (104). The first sewage inlet (101) and the first sewage outlet (102) are connected within the primary heat exchanger (1) to form a sewage zone. The first clean water inlet (103) and the first clean water outlet (104) are connected within the primary heat exchanger (1) to form a clean water zone. The sewage zone and the clean water zone are two spaces that are not connected to each other. The first sewage outlet (102) is connected to the hot water inlet of the heat pump unit (2), and the first clean water outlet (104) is connected to the hot water inlet of the heat pump unit (2).

2. The high-efficiency wastewater waste heat recovery device with large temperature difference according to claim 1, characterized in that: The heat pump unit (2) includes a circulating heat exchange pipeline (201) containing a heat exchange solvent, an expansion valve (202), a compressor (203), a heat release zone (204), and a heat absorption zone (205). The expansion valve (202) and the compressor (203) are both located on the circulating heat exchange pipeline (201). The heat release zone (204) is located on the pipe section between the outlet of the expansion valve (202) and the inlet of the compressor (203). The heat absorption zone (205) is located on the pipe section between the outlet of the compressor (203) and the inlet of the expansion valve (202). Both the heat release zone (204) and the heat absorption zone (205) are sealed structures. The inlet of the heat release zone (204) is a heat release water inlet, and the inlet of the heat absorption zone (205) is a heat absorption water inlet.

3. The high-efficiency wastewater waste heat recovery device with large temperature difference according to claim 2, characterized in that: The section of the circulating heat exchange pipeline (201) in the heat release zone (204) has a spiral structure, and the section of the circulating heat exchange pipeline (201) in the heat absorption zone (205) has a spiral structure.

4. The high-efficiency wastewater waste heat recovery device with large temperature difference according to claim 1, characterized in that: It also includes a waste heat recycling device (3), which includes a second sewage inlet (301), a second sewage outlet (302), a circulation outlet (303) and a circulation inlet (304), wherein the second sewage inlet (301) is connected to the first sewage outlet (102); The circulation outlet (303) is connected to the hot water inlet of the heat pump unit (2), the circulation inlet (304) is connected to the hot water outlet of the heat pump unit (2), and a circulation pressurization device (4) is provided on the pipe section connecting the waste heat recycling device (3) and the heat pump unit (2).

5. The high-efficiency wastewater waste heat recovery device with large temperature difference according to claim 4, characterized in that: The circulating pressurization device (4) is a circulating water pump. The inlet of the circulating water pump is connected to the hot water outlet of the heat pump unit (2), and the outlet of the circulating water pump is connected to the circulating inlet (304).

6. The high-efficiency wastewater waste heat recovery device with large temperature difference according to claim 1, characterized in that: The primary heat exchanger (1) is a wide-channel stainless steel sewage heat exchanger. The primary heat exchanger (1) includes a hot water chamber (105) and a hot water exchange pipe (106). The inlet of the hot water chamber (105) is the first sewage inlet (101), the outlet of the hot water chamber (105) is the first sewage outlet (102), the inlet of the hot water exchange pipe (106) is the first clean water inlet (103), and the outlet of the hot water exchange pipe (106) is the first clean water outlet (104). The inlet of the hot water chamber (105) and the outlet of the hot water exchange pipe (106) are located at the first end of the wide-channel stainless steel wastewater heat exchanger, while the outlet of the hot water chamber (105) and the inlet of the hot water exchange pipe (106) are located at the inlet end of the wide-channel stainless steel wastewater heat exchanger.

7. The high-efficiency wastewater waste heat recovery device with large temperature difference according to claim 6, characterized in that: The hot water exchange pipe (106) is a coil.

8. The high-efficiency wastewater waste heat recovery device with large temperature difference according to claim 4, characterized in that: The waste heat recycling device (3) is a wide-channel stainless steel wastewater heat exchanger. The waste heat recycling device (3) includes a circulation chamber (305). The inlet of the circulation chamber (305) is a second wastewater inlet (301), and the outlet of the circulation chamber (305) is a second wastewater outlet (302). The circulation outlet (303) and the circulation inlet (304) are connected to the circulation chamber (305).

9. The high-efficiency wastewater waste heat recovery device with large temperature difference according to any one of claims 1 to 8, characterized in that: It also includes a steam heater (5), which is provided with a heating inlet (501), a heating outlet (502), a steam inlet (503), and a condensate outlet (504). The heating inlet (501) and the heating outlet (502) are connected in the steam heater (5) to form a heating zone, and the steam inlet (503) and the condensate outlet (504) are connected in the steam heater (5) to form a steam heat release zone. The heating zone and the steam heat release zone are two spaces that are not connected to each other. The heat pump unit (2) has its hot water outlet connected to the heating inlet (501).

10. The high-efficiency wastewater waste heat recovery device with large temperature difference according to claim 9, characterized in that: The heating inlet (501) and the heating outlet (502) are connected by a heating pipe.

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