Anti-corrosion type primary sewage heat exchanger

Abstract

The utility model discloses an anti -corrosion type primary sewage heat exchanger, including integrated water tank, bearing base, medium water outlet pipe, medium water inlet pipe, sewage outlet and heat exchange pipe, the both sides of integrated water tank are provided with sewage inlet and sewage outlet respectively, integrated water tank is divided into sewage chamber of two ends and medium water chamber of middle through two sewage bulkhead plates, and a group of medium water outlet pipes and a group of medium water inlet pipes are arranged at the both ends of medium water chamber, so that the sewage flow direction is opposite to the flow direction of medium water in medium water chamber. The utility model adopts integrated sealing design, avoids the influence of the emission of irritating smell on the surrounding environment, improves the heat exchange efficiency through the structural design that the sewage flow direction is opposite to the flow direction of medium water in medium water chamber, and the service life of heat exchange pipe is improved through the pipeline design of sewage inlet.

Description

Technical Field

[0001] This utility model relates to the field of renewable energy utilization technology, specifically to a corrosion-resistant raw sewage heat exchanger. Background Technology

[0002] With the deepening of the national "dual-carbon" strategy, building energy conservation and renewable energy utilization technologies have received much attention. Urban sewage, due to its stable flow, suitable temperature (warm in winter and cool in summer), and high heat energy content, is considered a low-grade clean heat source with great application potential. Sewage source heat pump technology utilizes this characteristic to extract or release heat energy from sewage to achieve heating and cooling in buildings, offering advantages such as high energy efficiency, low operating costs, and significant environmental benefits. Based on whether there is direct contact between sewage and the heat pump working fluid, sewage source heat pump systems are mainly divided into two categories: direct and indirect.

[0003] In direct heat pump systems, wastewater directly enters the evaporator or condenser within the heat pump unit for heat exchange. While this method offers high heat transfer efficiency, the wastewater has a complex composition, containing large amounts of suspended solids, grease, fibers, sand, and other impurities, which easily cause severe fouling, scaling, and blockage on the inner walls of the heat exchange tubes. Furthermore, corrosive components in the wastewater, such as chloride ions and hydrogen sulfide, directly erode the expensive metal heat exchange tubes (such as copper tubes) within the heat pump unit, leading to a significant reduction in equipment lifespan and high maintenance costs, severely hindering the large-scale application of this technology.

[0004] To overcome the drawbacks of direct systems, indirect systems have emerged. This system adds a wastewater heat exchanger between the heat pump unit and the wastewater. The wastewater and a clean intermediate circulating medium (usually water or antifreeze) exchange heat non-contactly within the heat exchanger. The heated or cooled intermediate medium then returns to the heat pump unit. This method effectively protects the core heat pump unit and improves the system's reliability and lifespan. However, the performance of the core component of existing indirect systems, the raw wastewater heat exchanger, still faces severe challenges, mainly due to the following problems: First, in traditional shell-and-tube or plate wastewater heat exchangers, large particles of suspended matter, fibers, hair, etc., in the wastewater easily become entangled and adhere to the walls, quickly causing blockage of the heat exchange tubes and rendering the heat exchanger unable to function properly; Second, to prevent blockage, some designs use methods to increase the spacing between the flow channels, but this often comes at the cost of a compact heat exchange structure and efficient heat transfer performance, resulting in a large heat exchanger size, high material costs, and high initial investment; Third, the raw wastewater emits an irritating odor: immersion wastewater heat exchange systems typically have an open wastewater pool near the building, and the continuously emitted irritating odor has a significant impact on the sanitary environment. Therefore, we propose a corrosion-resistant raw wastewater heat exchanger to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a corrosion-resistant raw wastewater heat exchanger to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A corrosion-resistant raw wastewater heat exchanger includes an integrated water tank, a load-bearing base, a wastewater tank drain outlet, a wastewater inlet, a medium water outlet pipe, a medium water inlet pipe, a wastewater outlet, and heat exchange tubes. The inner wall of the integrated water tank is coated with a hot-dip galvanized layer to improve corrosion resistance. A wastewater inlet is located on one side of the integrated water tank, and a wastewater outlet at the same height as the wastewater inlet is located on the corresponding side. The integrated water tank is divided into two wastewater tank sections and a medium water tank in the middle by two wastewater tank wall panels. Multiple heat exchange tubes pass through the two wastewater tank wall panels and are sealed to the wastewater tanks. One set of medium water outlet pipes is located in the medium water tank near the wastewater inlet, and one set of medium water inlet pipes is located in the medium water tank near the wastewater outlet, so that the wastewater flow direction is opposite to the medium water flow direction in the medium water tanks. The bottom of the integrated water tank is fixed to the load-bearing base.

[0007] Furthermore, the entire surface of the medium water outlet pipe and the medium water inlet pipe located in the medium water tank is provided with through holes at uniform intervals; both the medium water outlet pipe and the medium water inlet pipe are L-shaped structures.

[0008] Furthermore, the medium water tank is equipped with two sets of baffles, which are inclined and funnel-shaped. The two sets of baffles are located between the bottom of the medium water inlet pipe and the medium water outlet pipe, with the smaller end of the funnel facing the direction of the medium water outlet pipe.

[0009] Furthermore, the sewage inlet is connected to a first sewage pipe located in the sewage chamber at the sewage inlet end; two parallel sewage spray pipes are respectively provided on the first sewage pipe; and the sewage spray pipes are uniformly provided with upward-opening spray nozzles.

[0010] Furthermore, the sewage outlet is connected to a second sewage pipe located in the sewage tank at the sewage discharge end; a set of horizontal sewage return pipes are provided on the second sewage pipe; and through holes are uniformly provided on the side surface of the sewage return pipes.

[0011] Furthermore, the upper surface of the integrated water tank is respectively provided with a sewage tank inspection port corresponding to the medium water outlet pipe and the medium water inlet pipe.

[0012] Furthermore, a support grid is provided in the medium water tank; a positioning hole is provided on the support grid; and the heat exchange tube is disposed in the positioning hole.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model adopts an integrated sealed and corrosion-resistant design, which avoids the emission of irritating odors from affecting the surrounding environment. By using a structural design where the sewage flow direction is opposite to the flow direction of the medium water in the medium water tank, the heat exchange efficiency is improved. At the same time, the medium water after heat exchange is input into the heat pump unit for full utilization, so as to realize the full utilization of thermal energy.

[0014] 2: By uniformly setting upward-facing spray nozzles on the first sewage pipe and sewage spray pipe connected to the sewage inlet, most of the large-particle suspended solids, fibers, and hair in the sewage can be retained in the sewage spray pipe, reducing their entry into the heat exchange tubes, thereby reducing the clogging of the heat exchange tubes. Compared with cleaning a large number of heat exchange tubes, cleaning the sewage spray pipe is much more time-saving and labor-saving.

[0015] 3. After the wastewater is heated, most of the debris remains at the bottom of the wastewater tank, making it easier to discharge it from the wastewater tank outlet for further treatment, thus improving the environmental protection effect. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0018] Figure 3 This is the front view of the present invention.

[0019] Figure 4 This is a top view of the present invention.

[0020] Figure 5 for Figure 3 A schematic diagram of the AA cross-section.

[0021] Figure 6 This is a schematic diagram of the sewage inlet pipe of this utility model.

[0022] Figure 7 This is a schematic diagram of the sewage outlet pipe of this utility model.

[0023] In the diagram: 1. Integrated water tank; 2. Load-bearing base; 3. Sewage tank drain outlet; 4. Sewage inlet; 5. Medium water outlet pipe; 6. Sewage tank inspection port; 7. Medium water inlet pipe; 8. Sewage outlet; 9. Heat exchange pipe; 10. Support grid; 11. Sewage tank wall panel; 12. Sewage tank; 13. Medium water tank; 14. Water baffle; 15. First sewage pipe; 16. Sewage spray pipe; 17. Second sewage pipe; 18. Sewage return pipe. Detailed Implementation

[0024] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figures 1 to 7As shown, this utility model provides a corrosion-resistant raw wastewater heat exchanger, including an integrated water tank 1, a load-bearing base 2, a wastewater tank drain outlet 3, a wastewater inlet 4, a medium water outlet pipe 5, a medium water inlet pipe 7, a wastewater outlet 8, and heat exchange pipes 9. The inner wall of the integrated water tank 1 is provided with a hot-dip galvanized layer. The integrated water tank 1 has a wastewater inlet 4 on one side and a wastewater outlet 8 at the same height as the wastewater inlet 4 on the other side, thereby improving the heat exchange efficiency of the wastewater. The integrated water tank 1 is divided into two wastewater tanks 12 at both ends and a medium water tank 13 in the middle by two wastewater tank wall panels 11. Multiple heat exchange pipes 9 pass through the two wastewater tank wall panels 11 and are sealed and connected to the wastewater tanks 12. A set of medium water outlet pipes 5 is set in the medium water tank 13 near the wastewater inlet 4, and a set of medium water inlet pipes 7 is set in the medium water tank 13 near the wastewater outlet 8, so that the wastewater flow direction is opposite to the medium water flow direction in the medium water tank 13. The bottom of the integrated water tank 1 is fixed on the load-bearing base 2. This utility model adopts an integrated sealing design to avoid the emission of irritating odors and their impact on the surrounding environment. By designing a structure in which the flow direction of sewage is opposite to that of the medium water in the medium water tank 13, the heat exchange efficiency is improved. At the same time, the medium water after heat exchange is input into the heat pump unit for full utilization, so as to realize the full utilization of thermal energy.

[0028] As a preferred embodiment, such as Figure 2 As shown, the medium water outlet pipe 5 and the medium water inlet pipe 7 are provided with through holes evenly spaced on all surfaces of the portion located in the medium water tank 13; both the medium water outlet pipe 5 and the medium water inlet pipe 7 are L-shaped structures. This structural design, combined with the structural design that the sewage flow direction is opposite to the medium water flow direction in the medium water tank 13, allows the medium water to flow out through the through holes as soon as it enters the medium water tank 13, and to fully contact the heat exchange pipe 9 for heat exchange.

[0029] As a preferred embodiment, such as Figure 2 and Figure 5 As shown, the medium water chamber 13 is provided with two sets of baffles 14. The baffles 14 are inclined and shaped like a funnel. The two sets of baffles 14 are located between the bottom of the medium water inlet pipe 7 and the medium water outlet pipe 5. The smaller end of the funnel is facing the direction of the medium water outlet pipe 5. By setting the baffles 14, the medium water is allowed to flow from the funnel, thereby impacting the heat exchange tube 9 and achieving full contact heat exchange.

[0030] As a preferred embodiment, such as Figure 6As shown, the sewage inlet 4 is connected to the first sewage pipe 15 located in the sewage chamber 12 at the sewage inlet end; two parallel sewage spray pipes 16 are respectively provided on the first sewage pipe 15; the sewage spray pipes 16 are uniformly provided with upward-opening spray nozzles; through this structural design, most of the large-particle suspended solids, fibers, and hair in the sewage can be retained in the sewage spray pipes 16, reducing their entry into the heat exchange pipes 9, thereby reducing the clogging of the heat exchange pipes 9. Moreover, there are many heat exchange pipes 9, and cleaning them after clogging is very time-consuming and laborious, while cleaning the sewage spray pipes 16 is very convenient.

[0031] As a preferred embodiment, such as Figure 7 As shown, the sewage outlet 8 is connected to the second sewage pipe 17 in the sewage tank 12 at the sewage discharge end; a set of horizontal sewage return pipes 18 are provided on the second sewage pipe 17; the side surface of the sewage return pipe 18 is uniformly provided with through holes. After heat exchange, the sewage enters the sewage tank 12 at the sewage discharge end, and is driven by the sewage pump to be discharged from the sewage return pipe 18. Due to the through holes on the side of the sewage return pipe 18, the sewage can be carried away, while most of the other parts remain at the bottom of the sewage tank 12, which is convenient for discharge from the sewage tank outlet 3 and then for treatment.

[0032] As a preferred embodiment, such as Figures 1 to 4 As shown, the upper surface of the integrated water tank 1 is respectively provided with sewage tank inspection ports 6 corresponding to the medium water outlet pipe 5 and the medium water inlet pipe 7, which facilitates maintenance and allows for regular access to the sewage tank 12 through the sewage tank inspection port 6 for cleaning.

[0033] As a preferred embodiment, such as Figure 2 and Figure 5 As shown, a support grid 10 is provided in the medium water tank 13; a positioning hole is provided on the support grid 10; and the heat exchange tube 9 is installed in the positioning hole to improve the stability of the heat exchange tube 9 installation and extend its service life.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention 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 invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A corrosion-resistant raw wastewater heat exchanger, characterized in that: The system includes an integrated water tank, a load-bearing base, a sewage tank drain outlet, a sewage inlet, a medium water outlet pipe, a medium water inlet pipe, a sewage outlet, and heat exchange pipes. The inner wall of the integrated water tank is coated with a hot-dip galvanized layer. A sewage inlet is located on one side of the integrated water tank, and a sewage outlet at the same height as the sewage inlet is located on the corresponding side. The integrated water tank is divided into two sewage tanks and a medium water tank in the middle by two sewage tank wall panels. Multiple heat exchange pipes pass through the two sewage tank wall panels and are sealed to the sewage tanks. One set of medium water outlet pipes is located in the medium water tank near the sewage inlet, and one set of medium water inlet pipes is located in the medium water tank near the sewage outlet, so that the sewage flow direction is opposite to the medium water flow direction in the medium water tanks. The bottom of the integrated water tank is fixed to the load-bearing base.

2. The corrosion-resistant raw wastewater heat exchanger according to claim 1, characterized in that: The medium water outlet pipe and the medium water inlet pipe located in the medium water tank have through holes evenly spaced on their entire surface; both the medium water outlet pipe and the medium water inlet pipe are L-shaped structures.

3. The corrosion-resistant raw wastewater heat exchanger according to claim 1, characterized in that: The medium water tank is equipped with two sets of baffles, which are inclined and funnel-shaped. The two sets of baffles are located between the bottom of the medium water inlet pipe and the medium water outlet pipe, with the smaller end of the funnel facing the direction of the medium water outlet pipe.

4. The corrosion-resistant raw wastewater heat exchanger according to claim 1, characterized in that: The sewage inlet is connected to a first sewage pipe located in the sewage chamber at the sewage inlet end; two parallel sewage spray pipes are respectively installed on the first sewage pipe; and the sewage spray pipes are uniformly provided with upward-opening spray nozzles.

5. The corrosion-resistant raw wastewater heat exchanger according to claim 1, characterized in that: The sewage outlet is connected to a second sewage pipe located in the sewage tank at the sewage discharge end; a set of horizontal sewage return pipes are provided on the second sewage pipe; and through holes are uniformly provided on the side surface of the sewage return pipes.

6. The corrosion-resistant raw wastewater heat exchanger according to claim 1, characterized in that: The upper surface of the integrated water tank is respectively provided with sewage compartment inspection ports corresponding to the medium water outlet pipe and the medium water inlet pipe.

7. The corrosion-resistant raw wastewater heat exchanger according to claim 1, characterized in that: The medium water tank is equipped with a support grid; the support grid is provided with positioning holes; and the heat exchange tube is installed in the positioning holes.

Images