Centralized box type all-in-one machine for two-stage heat extraction and one-time hot water production of bathing wastewater

Abstract

The invention relates to the field of bathing wastewater treatment, in particular to a centralized box type all-in-one machine for secondary heat extraction and one-time water heating of bathing wastewater. The bathing wastewater secondary heat extraction and one-time hot water production centralized tank type all-in-one machine comprises a sewage storage and supply system and a purified water supply and storage system. A first-stage sewage heat exchanger and a second-stage bathing wastewater large-temperature-difference special sewage source heat pump are arranged in the concentration box; the sewage storage and water supply system and the purified water supply and water storage system each comprise a pipeline structure used for conveying water, and the pipeline structures in the sewage storage and water supply system and the purified water supply and water storage system are connected with the first-stage sewage heat exchanger and the second-stage bathing wastewater large-temperature-difference special sewage source heat pump. According to the bathing wastewater two-stage heat extraction and one-time water heating centralized box type all-in-one machine, the heat exchanger and the sewage source heat pump are both of a hinge type structure, dirt is convenient to clean, equipment operation is not affected, and the problems that an existing domestic bathing wastewater waste heat recovery system is large in occupied area, difficult in dirt removal, long in water heating time and the like are solved.

Description

Technical Field

[0001] This invention relates to the field of bathing wastewater treatment, and in particular to a centralized box-type integrated machine for secondary heat extraction and one-time hot water production from bathing wastewater. Background Technology

[0002] Currently, the utilization rate of waste heat from bathhouse wastewater is very low, and most bathhouse wastewater is directly discharged into the sewer, resulting in a large waste of energy.

[0003] Currently, domestic wastewater heat recovery equipment primarily uses wastewater heat exchangers combined with wastewater source heat pumps to produce hot water for bathing. This equipment is typically located in a machine room, resulting in dispersed equipment and a large footprint. The existing wastewater heat recovery equipment uses plate heat exchangers with ordinary heat pump units featuring anti-corrosion coatings, which generally suffer from difficulties in cleaning scale buildup. Furthermore, the commonly used plate heat exchangers and wastewater source heat pumps do not produce hot water in a single cycle; instead, the hot water is circulated multiple times, heated to a set temperature, and then stored. This technology currently suffers from problems such as large footprint, difficulty in descaling, and long hot water production times.

[0004] Therefore, it is necessary to provide a new integrated box-type hot water generator for secondary heat extraction of bath wastewater to solve the above-mentioned technical problems. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a centralized box-type integrated machine for secondary heat extraction and one-time hot water production from bath wastewater.

[0006] The present invention provides a centralized box-type integrated machine for secondary heat extraction and one-time hot water production from bath wastewater, comprising a wastewater storage and supply system and a purified water supply and storage system; It also includes a centralized box with a built-in primary sewage heat exchanger and a secondary sewage source heat pump for large temperature difference in bath wastewater; Both the sewage storage and water supply system and the purified water supply and storage system include pipeline structures for water transportation. The pipeline structures in both systems are connected to a primary sewage heat exchanger and a secondary wastewater source heat pump with a large temperature difference for bathing wastewater, so as to use the heat in the sewage to reheat the purified water. Among them, the primary sewage heat exchanger and the secondary bath wastewater large temperature difference special sewage source heat pump both adopt a hinged door structure.

[0007] Preferably, the piping structure of both the sewage storage and supply system and the purified water supply and storage system includes internal piping and external piping. The outer wall of the centralized tank has a sewage inlet and a sewage outlet connected to the sewage storage and supply system, and a tap water inlet and a tap water outlet connected to the purified water supply and storage system. These inlets and outlets are connected to the internal pipes in the corresponding pipeline structure by socket plug connection, while they are connected to the external pipes by flange connection.

[0008] Preferably, the input end of the pipeline structure in the sewage storage and supply system is connected to the sewage collection tank, and the output end is connected to the sewage drainage ditch. The input end of the pipeline structure in the water purification supply and storage system is connected to the water purification supply pipe or the container for storing purified water, and the output end is connected to the finished insulated water tank.

[0009] Preferably, the input end of the pipeline structure in the sewage storage and supply system has a submersible pump for drawing sewage from the inside of the sewage collection tank, and a multi-stage sewage filtration assembly located upstream of the primary sewage heat exchanger is installed in the pipeline structure. The water purification supply and storage system includes a pipeline pump located upstream of the primary sewage heat exchanger for transporting purified water, as well as a multi-stage water purification filtration assembly.

[0010] Preferably, the multi-stage wastewater filtration assembly includes a hair filter, a sand filter, and a wastewater filter in sequence from upstream to downstream. The hair filter and sand filter are located on the external pipeline, while the wastewater filter is located on the internal pipeline.

[0011] Preferably, the multi-stage water filtration assembly includes a tap water filter and a descaling device sequentially from upstream to downstream, and both the tap water filter and the descaling device are located on the pipeline inside the tank.

[0012] Preferably, the water purification supply and storage system is further equipped with an electric auxiliary heating device located downstream of the secondary bath wastewater large temperature difference special sewage source heat pump for further heating the purified water on the tank pipeline.

[0013] A method for using a centralized box-type integrated unit for secondary heat extraction and one-time hot water production from bath wastewater includes: S1. Turn on the submersible pump and the pipeline pump to introduce sewage and clean water into the corresponding pipeline structures respectively; S2. Wastewater is passed to a multi-stage wastewater filtration unit to remove impurities from the wastewater; purified water is passed to a multi-stage water filtration unit to remove impurities from the purified water. S3. Wastewater and purified water enter the first-stage wastewater heat exchanger, where the heat from the wastewater is used to heat the purified water. S4. Sewage and purified water enter the secondary bath wastewater large temperature difference special sewage source heat pump, and use the heat of sewage to reheat the purified water. S5. The wastewater is discharged into the wastewater drainage ditch, while the clean water is introduced into the finished insulated water tank for storage.

[0014] Preferably, in steps S3 and S4, the temperature of the purified water rises from 15°C to 25°C after the first heating and can reach 45°C after the second heating, while the temperature of the sewage drops to 5°C.

[0015] Preferably, in step S5, the purified water flows through the electric auxiliary heating device after being heated twice, and the purified water can be heated three times by the electric auxiliary heating device to further increase the temperature of the purified water.

[0016] Compared with the related art, the bathing wastewater two-stage heat recovery one-time hot water production centralized box type all-in-one machine has the following beneficial effects: The centralized box type structure is adopted, the first-stage sewage heat exchanger, the second-stage bathing wastewater large temperature difference special sewage source heat pump, the filtering device and the power distribution automatic control device are integrated in the centralized box. The integrated device has small floor area and does not need to build a new machine room; the second-stage heating form is adopted, the tap water is directly heated in the device, and the tap water is hot water meeting the bathing use requirement after being discharged from the device, the tap water is heated for a short time and is produced at one time; the centralized box type bathing hot water heating device can be prefabricated in a factory, and after being manufactured, the device is transported to a project site to be directly connected and used, thereby greatly shortening the construction period and improving the construction efficiency; all the devices in the technology are special bathing wastewater devices, the heat exchanger and the sewage source heat pump adopt the hinge type structure, the cleaning of dirt is convenient, and the operation of the device is not affected. The technology solves the problems of large floor area, difficult dirt removal and long hot water production time of the existing domestic bathing wastewater waste heat recovery system. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The structure schematic view of a preferred embodiment of the bathing wastewater two-stage heat recovery one-time hot water production centralized box type all-in-one machine provided by the present application is shown in the figure. Figure 2 The structure schematic view of the heat exchange process shown by the present application is shown in the figure.

[0018] In the figure, 1 is a sewage collection tank, 2 is a submerged sewage pump, 3 is a hair filter, 4 is a sand cylinder, 5 is a sewage inlet, 6 is a tap water inlet, 7 is a tap water filter, 8 is a dirt removal device, 9 is a sewage filter, 10 is a pipeline pump, 11 is a first-stage sewage heat exchanger, 12 is a second-stage bathing wastewater large temperature difference special sewage source heat pump, 13 is an electric auxiliary heating device, 14 is a centralized box, 15 is a tap water outlet, 16 is a sewage outlet and 17 is a finished product heat preservation water tank. DETAILED DESCRIPTION

[0019] The present application is described in detail below in combination with specific embodiments.

[0020] Embodiment one Please refer to Figure 1 The bathing wastewater two-stage heat recovery one-time hot water production centralized box type all-in-one machine provided by the embodiment of the present application includes a sewage storage and water supply system, a purified water supply system and a centralized box 14 internally provided with a first-stage sewage heat exchanger 11 and a second-stage bathing wastewater large temperature difference special sewage source heat pump 12. The sewage water storage and supply system and the clean water storage and supply system both include pipeline structures for water transportation. The input end of the pipeline structure in the sewage water storage and supply system is connected to the sewage collection tank 1, and the output end is connected to the sewage drainage ditch. The input end of the pipeline structure in the clean water storage and supply system is connected to the clean water supply pipe or the clean water storage container, and the output end is connected to the finished product heat preservation water tank 17. Both of the pipeline structures are connected to the first sewage heat exchanger 11 and the second bathing wastewater large temperature difference special sewage source heat pump 12. Meanwhile, the second bathing wastewater large temperature difference special sewage source heat pump 12 is internally provided with a condenser and an evaporator. The pipeline structure in the sewage water storage and supply system is connected to the evaporator, and the pipeline structure in the clean water storage and supply system is connected to the condenser.

[0021] It should be noted that in the device, large equipment such as the first sewage heat exchanger 11 and the second bathing wastewater large temperature difference special sewage source heat pump 12 are installed inside the centralized box 14, and power supply equipment is also provided. The integrated equipment has a small footprint and does not require a new machine room. The sewage water storage and supply system can store and transport sewage, i.e., the wastewater after bathing is stored in the sewage collection tank 1, and the corresponding pipeline structure is connected to the sewage collection tank 1 to extract the internal sewage, which is discharged to the sewage drainage ditch after the heat exchange process. The clean water storage and supply system can transport and store clean water, i.e., the input end is connected to the clean water supply pipe or directly connected to the clean water storage container to guide the clean water into the corresponding pipeline structure, and then the clean water is guided into the finished product heat preservation water tank 17 after the heat exchange process for storage. The pipeline structures in the sewage water storage and supply system and the clean water storage and supply system are both connected to the first sewage heat exchanger 11 and the second bathing wastewater large temperature difference special sewage source heat pump 12. Therefore, the sewage and clean water can be subjected to primary heat exchange through the first sewage heat exchanger 11, and the clean water is heated after the primary heat exchange. The sewage and clean water can be subjected to secondary heat exchange through the second bathing wastewater large temperature difference special sewage source heat pump 12. In particular, the second bathing wastewater large temperature difference special sewage source heat pump 12 is provided with a condenser and an evaporator. The pipeline structure in the sewage water storage and supply system is connected to the evaporator to further release the heat in the sewage after the evaporator, and the pipeline structure in the clean water storage and supply system is connected to the condenser to absorb the heat released from the sewage, thereby achieving secondary heat exchange of the clean water.

[0022] It should be further noted that the first sewage heat exchanger 11 and the second bathing wastewater large temperature difference special sewage source heat pump 12 both adopt a hinged door structure. When the equipment is running for a period of time and scaling occurs, the valve can be closed and the hinged door structure can be opened for cleaning the inside of the equipment with a high-pressure water gun. Therefore, the cleaning difficulty is relatively low, and the device has higher practicality.

[0023] The connection between the pipeline structure and the centralized tank 14 in the sewage storage water supply system and the clean water storage water supply system; Please refer to Figure 1 The pipeline structure in the sewage storage water supply system and the clean water storage water supply system both include the in-tank pipeline and the out-tank pipeline; The outer wall of the centralized tank 14 has a sewage inlet 5, a sewage outlet 16 connected to the sewage storage water supply system, and a tap water inlet 6, a tap water outlet 15 connected to the clean water storage water supply system. The inlets and outlets are connected to the in-tank pipeline of the corresponding pipeline structure by socket insertion, and are connected to the out-tank pipeline by flange connection.

[0024] It should be noted that the pipeline structure in the sewage storage water supply system and the clean water storage water supply system both adopt assembly design, that is, they include the in-tank pipeline and the out-tank pipeline. The in-tank pipeline is installed inside the centralized tank 14, and the pipeline structure realizes connection with the primary sewage heat exchanger 11 and the secondary bathing wastewater large-temperature-difference special sewage source heat pump 12. The out-tank pipeline is connected to the corresponding inlet and outlet by flange connection, so that both of them form a complete pipeline structure. This design makes the in-tank pipeline and the centralized tank 14 integrated, which is more convenient for transportation, assembly and storage of the entire heat exchange equipment.

[0025] For the sewage storage water supply system; Please refer to Figure 1 The input end of the pipeline structure in the sewage storage water supply system has a sewage pump 2 for pumping sewage in the sewage collection tank 1, and a sewage multi-stage filtering assembly is arranged in the pipeline structure at a position upstream of the primary sewage heat exchanger 11. The sewage multi-stage filtering assembly includes a hair filter 3, a sand cylinder 4 and a sewage filter 9 from upstream to downstream. The hair filter 3 and the sand cylinder 4 are located on the out-tank pipeline, and the sewage filter 9 is located on the in-tank pipeline.

[0026] It should be noted that in the sewage storage water supply system, the sewage pump 2 is the power equipment for transporting sewage. It is a water pump specially designed for sewage treatment. Its shell is usually made of stainless steel or cast iron, which has good corrosion resistance and long service life. It can directly pump sewage in the sewage collection tank 1. Before heat exchange, the sewage is filtered by the sewage multi-stage filtering assembly. For the multi-stage filtering assembly, it includes a hair filter 3, a sand cylinder 4 and a sewage filter 9 (these devices are mature existing technologies, and will not be described in detail here), which can filter sewage at multiple levels to prevent discharged sewage from damaging the environment.

[0027] For the clean water storage water supply system; Please refer to Figure 1 The pipeline structure of the clean water supply and storage system is provided with a pipeline pump 10 for conveying clean water at an upstream position of the primary sewage heat exchanger 11, and is also provided with a clean water multi-stage filtering assembly; The clean water multi-stage filtering assembly comprises, from upstream to downstream, a tap water filter 7 and a descaling device 8, both of which are located on the pipeline in the tank; Meanwhile, the pipeline in the tank of the clean water supply and storage system is also provided with an electric auxiliary heating device 13 for further heating of clean water at a downstream position of the secondary bathing sewage large-temperature-difference special sewage source heat pump 12.

[0028] It should be noted that, in the clean water supply and storage system, the pipeline pump 10 is used as the power equipment for conveying clean water, and before heat exchange, the clean water is filtered by the clean water multi-stage filtering assembly; The clean water multi-stage filtering assembly comprises the tap water filter 7 and the descaling device 8 (both of which are mature existing technologies and will not be described in detail here), for further purification of clean water; The electric auxiliary heating device 13 is also provided in the pipeline structure of the clean water supply and storage system, which can further heat the clean water after secondary heat exchange to make it have a higher temperature. This device is an auxiliary device, and if the clean water is heated twice to meet the bathing demand, it is not necessary to further heat it by using the electric auxiliary heating device 13.

[0029] Example Two Please refer to Figure 2 A use method of the bathing sewage two-stage heat extraction one-time hot water preparation centralized tank-type all-in-one machine, comprising: S1, start the sewage pump 2 and the pipeline pump 10, and respectively guide the sewage and the clean water into the corresponding pipeline structure; S2, the sewage is guided into the sewage multi-stage filtering assembly to remove impurities in the sewage; the clean water is guided into the clean water multi-stage filtering assembly to remove impurities in the clean water; S3, the sewage and the clean water enter the primary sewage heat exchanger 11, and the clean water is heated once by the heat of the sewage; S4, the sewage and the clean water enter the secondary bathing sewage large-temperature-difference special sewage source heat pump 12, and the clean water is heated twice by the heat of the sewage; S5, the sewage is discharged to the sewage drainage ditch, and the clean water is guided into the finished product heat preservation water tank 17 for storage; In steps S3 and S4, the temperature of the clean water is raised from 15℃ to 25℃ after the first heating, and the temperature of the clean water can reach 45℃ after the second heating, while the temperature of the sewage is reduced to 5℃. In step S5, the clean water is heated for the third time by the electric auxiliary heating device 13 after the second heating, so as to further raise the temperature of the clean water.

[0030] The specific use process of the device is as follows: The sewage pump 2 and the pipeline pump 10 are started, and the sewage and the clean water are introduced into the corresponding pipeline structures, respectively, and flow through the multi-stage filtering assemblies in the corresponding pipeline structures, so as to treat the sewage and the clean water. Then, the sewage and the clean water enter the primary sewage heat exchanger 11, at this time, the heat in the sewage is transferred to the clean water, so as to heat the clean water for the first time, and the temperature of the clean water can reach 25℃. After the heat exchange is completed, the sewage and the clean water enter the secondary bathing wastewater large temperature difference special sewage source heat pump 12, and are treated by the evaporator and the condenser to realize the second heat exchange, at this time, the clean water can reach 45℃. After the second heat exchange, the sewage is discharged into the sewage drainage ditch, and the clean water can be introduced into the finished product heat preservation water tank 17. If it is required to make the temperature of the clean water higher, the electric auxiliary heating device 13 can be used to further heat the clean water, The centralized box type structure is adopted, the primary sewage heat exchanger, the secondary bathing wastewater large temperature difference special sewage source heat pump, the filtering device and the power distribution automatic control device are integrated in the centralized box. The integrated device has small floor area and does not need to build a new machine room. The tap water is directly heated in the device, and the heated water meets the requirements of bathing after being discharged from the device. The heating time of the tap water is short, and the water is formed at one time. The centralized box type bathing hot water heating device can be directly prefabricated in the factory, transported to the project site after being manufactured, and directly connected and used, so that the construction period is greatly shortened and the construction efficiency is improved. All the devices in the technology adopt the bathing wastewater special device, the heat exchanger and the sewage source heat pump adopt the hinge type structure, the cleaning of dirt is convenient, and the operation of the device is not affected. The application solves the problems of large floor area, difficult descaling and long hot water forming time of the existing domestic bathing wastewater waste heat recovery system.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A centralized box-type integrated machine for secondary heat extraction and one-time hot water production from bathing wastewater, comprising a wastewater storage and supply system and a purified water supply and storage system, characterized in that: It also includes a central box (14) with a built-in primary sewage heat exchanger (11) and a secondary sewage source heat pump (12) for large temperature difference of bathing wastewater. Both the sewage storage and water supply system and the purified water supply and storage system include pipeline structures for water transmission. The pipeline structures in both systems are connected to a primary sewage heat exchanger (11) and a secondary wastewater source heat pump (12) for large temperature difference in bath wastewater, so as to use the heat in the sewage to heat the purified water in a secondary manner. The piping structure of both the sewage storage and supply system and the purified water supply and storage system includes internal piping and external piping. The outer wall of the central box (14) has a sewage inlet (5) and a sewage outlet (16) connected to the sewage storage and water supply system, and a tap water inlet (6) and a tap water outlet (15) connected to the clean water supply and water storage system. These inlets and outlets are connected to the pipes inside the box in the corresponding pipe structure by socket plug connection, while they are connected to the pipes outside the box by flange connection. The primary sewage heat exchanger (11) and the secondary bath wastewater large temperature difference special sewage source heat pump (12) are both hinged door structure.

2. The centralized box-type integrated machine for secondary heat extraction and one-time hot water production from bath wastewater according to claim 1, characterized in that, The input end of the pipeline structure in the sewage storage and water supply system is connected to the sewage collection tank (1), and the output end is connected to the sewage drainage ditch. The input end of the pipeline structure in the water purification supply and storage system is connected to the water purification supply pipe or the container for storing purified water, and the output end is connected to the finished insulated water tank (17).

3. The centralized box-type integrated unit for secondary heat extraction and one-time hot water production of bath wastewater according to claim 2, characterized in that, The sewage storage and water supply system has a submersible pump (2) at the input end of the pipeline structure for drawing sewage from the sewage collection tank (1), and a multi-stage sewage filtration assembly located upstream of the primary sewage heat exchanger (11) is installed in the pipeline structure. The water purification supply and storage system is equipped with a pipeline pump (10) located upstream of the primary sewage heat exchanger (11) for transporting purified water, and also with a multi-stage water purification filtration assembly.

4. The centralized box-type integrated machine for secondary heat extraction and one-time hot water production from bath wastewater according to claim 3, characterized in that, The multi-stage wastewater filtration assembly includes a hair filter (3), a sand filter (4), and a wastewater filter (9) from upstream to downstream. The hair filter (3) and the sand filter (4) are located on the external pipeline, while the wastewater filter (9) is located on the internal pipeline.

5. The centralized box-type integrated machine for secondary heat extraction and one-time hot water production from bath wastewater according to claim 4, characterized in that, The multi-stage water filtration assembly includes a tap water filter (7) and a descaling device (8) from upstream to downstream, and both the tap water filter (7) and the descaling device (8) are located on the pipeline inside the tank.

6. The centralized box-type integrated unit for secondary heat extraction and one-time hot water production from bath wastewater according to claim 5, characterized in that, The water purification supply and storage system is also equipped with an electric auxiliary heating device (13) located downstream of the secondary bath wastewater large temperature difference special sewage source heat pump (12) for further heating the purified water.

7. The method of using a centralized box-type integrated machine for secondary heat extraction and one-time hot water production from bathing wastewater according to claims 1-6, characterized in that, include: S1. Turn on the submersible pump (2) and the pipeline pump (10) to introduce sewage and clean water into the corresponding pipeline structures respectively; S2. Wastewater is passed to a multi-stage wastewater filtration unit to remove impurities from the wastewater; purified water is passed to a multi-stage water filtration unit to remove impurities from the purified water. S3. Sewage and clean water enter the first-stage sewage heat exchanger (11) and use the heat in the sewage to heat the clean water once. S4. Sewage and clean water enter the secondary bath wastewater large temperature difference special sewage source heat pump (12) and use the heat of sewage to heat the clean water a second time. S5. The wastewater is discharged into the wastewater drainage ditch, while the clean water is introduced into the finished insulated water tank (17) for storage.

8. The centralized box-type integrated unit for secondary heat extraction and one-time hot water production from bath wastewater according to claim 7, characterized in that, In steps S3 and S4, the temperature of the purified water rises from 15°C to 25°C after the first heating and can reach 45°C after the second heating, while the temperature of the sewage drops to 5°C.

9. The centralized box-type integrated unit for secondary heat extraction and one-time hot water production of bath wastewater according to claim 8, characterized in that, In step S5, after the purified water is heated twice, it flows through the electric auxiliary heating device (13), which can be used to heat it a third time to further increase the temperature of the purified water.

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