Wastewater recovery and reuse system and method

Abstract

The present application relates to wastewater treatment technical field and disclose a kind of wastewater recycling system and method, the system includes collection tank, comprehensive reuse water tank, filtration unit and reuse water pump;Collection tank is used to collect hot wastewater, comprehensive reuse water tank is connected with collection tank and temperature regulation is carried out to hot wastewater, filtration unit is used to remove solid impurities, and reuse water pump is pumped to urea dissolving tank after filtration hot wastewater as dissolving make-up water, or pumped to pipeline flushing circuit as flushing water source.The present application is by constructing collection, temperature regulation, filtration, distribution processing link, realizes to the high-efficiency recovery and closed loop reuse of urea ammonia production area heat tracing drain and various drain, effectively saves industrial fresh water consumption, recycles waste heat resource, guarantees the water temperature stability of urea dissolving process, with the advantages of water and energy saving, high degree of automation, stable operation.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically relating to a wastewater recycling system and method. Background Technology

[0002] During the operation of urea hydrolysis and pyrolysis ammonia production systems in thermal power plants, a large amount of wastewater is generated from urea dissolving tanks, transfer pumps, pipeline heating, equipment cooling, and periodic flushing. Currently, most power plants directly discharge steam-heated condensate, pump cooling water, pipeline flushing water, and tank overflow water into ditches or wastewater systems. This treatment method not only wastes water resources, but also results in significant heat loss due to the large amount of heat carried in the steam-heated condensate, leading to low energy utilization of the system. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a wastewater recycling system and method, which can recover heat energy from steam tracing condensate, thereby improving energy utilization efficiency.

[0004] The wastewater recycling system of this invention includes a collection tank, a comprehensive recycled water tank, a filtration unit, and a recycled water pump. The collection tank collects hot wastewater; the comprehensive recycled water tank is connected to the collection tank to allow the hot wastewater to enter, and the comprehensive recycled water tank is used to regulate the temperature of the hot wastewater; the filtration unit is connected to the comprehensive recycled water tank to allow the temperature-regulated hot wastewater to enter the filtration unit, and the filtration unit is used to filter solids from the hot wastewater; the recycled water pump is connected to the filtration unit to allow the filtered hot wastewater to enter the pump, and the recycled water pump is connected to a urea dissolving tank and a pipeline flushing circuit, and the recycled water pump is used to pump the hot wastewater into the urea dissolving tank and the pipeline flushing circuit.

[0005] This invention, through the construction of a complete physical chain encompassing collection, temperature regulation, filtration, and distribution, achieves tiered treatment and on-demand reuse of hot wastewater. Compared to the existing practice of directly discharging condensate, this system not only recovers valuable water resources and reduces the amount of fresh industrial water required, but also effectively avoids uneven urea dissolution or crystallization caused by temperature fluctuations due to pre-regulation of the water temperature, ensuring the process stability of the urea-to-ammonia system. By simultaneously supplying recycled water to both the dissolution and rinsing pathways, tiered utilization of water resources and a closed-loop circulation within the system are achieved.

[0006] In some embodiments, the collection box is connected to a steam-heated heat tracing unit, and the collection box is used to collect the heat tracing condensate in the steam-heated heat tracing unit.

[0007] In some embodiments, the integrated recycled water tank includes a mixing component, which includes a mixing tank body, a stirring rod, and a motor. The mixing tank body is connected to the collection tank and is used to contain hot wastewater. The motor is mounted on the mixing tank body, and the output end of the motor is connected to the stirring rod. The stirring rod is disposed in the mixing tank body and is used to stir the hot wastewater.

[0008] In some embodiments, the mixing chamber is provided with a plurality of overflow holes, which are spaced apart along the circumferential direction on the mixing chamber and are located on the same horizontal plane.

[0009] In some embodiments, the integrated recycled water tank further includes a temperature regulating component, which includes a temperature regulating chamber and a cooling coil. The temperature regulating chamber contains a temperature regulating medium, and the cooling coil is disposed in the temperature regulating chamber. One end of the cooling coil is connected to the mixing chamber, and the other end of the cooling coil is connected to the filter unit. The cooling coil is corrugated, and the temperature regulating medium is used to adjust the temperature of the hot wastewater flowing through the cooling coil.

[0010] In some embodiments, the wastewater recycling system further includes a regulating valve, the inlet of which is connected to the outlet of the recycled water pump, and the outlet of which is connected to the urea dissolving tank and the pipeline flushing circuit. The regulating valve is used to adjust the flow rate of the hot wastewater.

[0011] In some embodiments, the wastewater recycling system further includes a wastewater tank connected to the pipeline flushing circuit and the equipment cooling water pipeline, and the wastewater tank is used to receive the flushing water from the pipeline flushing circuit and the equipment cooling water.

[0012] In some embodiments, the wastewater recycling system further includes a control unit connected to the recycled water pump and the regulating valve. The control unit is used to adjust the power of the recycled water pump and to adjust the opening degree of the regulating valve.

[0013] In some embodiments, the wastewater recycling system further includes a temperature sensor and a level sensor. The temperature sensor is disposed in the integrated recycled water tank and connected to the control unit. The temperature sensor is used to monitor the temperature of the hot wastewater in the integrated recycled water tank. The level sensor is disposed in the integrated recycled water tank and connected to the control unit. The level sensor is used to monitor the level of the hot wastewater in the integrated recycled water tank.

[0014] The wastewater recycling and reuse method of this invention, utilizing any of the wastewater recycling and reuse systems described above, includes the following steps:

[0015] Wastewater collection: Collect hot wastewater using collection tanks; Temperature regulation: The hot wastewater in the collection tank is sent to the integrated recycled water tank to regulate the temperature of the hot wastewater; Filtration: The heated wastewater, after temperature adjustment, is sent into the filtration unit to remove solid impurities from the wastewater. Reuse and distribution: The filtered hot wastewater is pumped to the urea dissolving tank as dissolution makeup water using a recycled water pump, and / or pumped to the pipeline flushing circuit as flushing water source.

[0016] This method organically integrates physical collection, thermodynamic temperature control, mechanical filtration, and automatic distribution control steps to form a standardized wastewater treatment and reuse process. The beneficial effects of this method are: transforming previously disorderly discharged wastewater into an orderly reused resource; solving the temperature fluctuation problem in hydrophobic waste heat recovery through forced stirring and heat exchange; and eliminating the risk of blockage in the reuse water circuit through pre-filtration. Ultimately, it achieves efficient recovery and utilization of water resources and heat energy, significantly reducing the operating costs and environmental footprint of urea-ammonia production systems in thermal power plants. Attached Figure Description

[0017] Figure 1 This is an overall schematic diagram of the present invention.

[0018] Figure 2 This is a schematic diagram of the structure of the hybrid component in this invention.

[0019] Figure 3 This is a schematic diagram of the temperature regulating component in this invention.

[0020] Figure 4 This is a schematic diagram of the stirring rod in this invention.

[0021] Figure label: 1. Collection box; 2. Integrated recycled water tank; 21. Mixing component; 211. Mixing tank body; 212. Stirring rod; 2121. Mounting shaft; 2122. Support rod; 2123. Mounting sleeve; 213. Motor; 214. Overflow hole; 22. Temperature control component; 221. Temperature control box; 222. Cooling coil; 3. Filter unit; 4. Reclaimed water pump; 5. Urea dissolving tank; 6. Pipeline flushing circuit; 7. Steam heating and heat tracing unit; 8. Control valve; 9. Wastewater tank; 10. Equipment cooling water piping; 11. Control unit; 12. Temperature sensor; 13. Liquid level sensor. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] This invention provides a wastewater recycling and reuse system and method, which is particularly suitable for urea-ammonia production areas in thermal power plants. It aims to achieve closed-loop recycling and reuse of heat tracing condensate, equipment cooling water, and flushing wastewater.

[0024] like Figures 1-4 As shown, the wastewater recycling system of this invention includes a collection tank 1, a comprehensive recycled water tank 2, a filtration unit 3, a recycled water pump 4, a urea dissolving tank 5, and a pipeline flushing circuit 6.

[0025] Specifically, collection tank 1 is used to collect hot wastewater, which mainly refers to the high-temperature condensate and condensate generated by the steam tracing unit in the urea station of the thermal power plant. Integrated recycled water tank 2 is connected to collection tank 1, receiving the hot wastewater from collection tank 1 and regulating its temperature to meet the requirements of subsequent reuse processes. The regulated hot wastewater then enters filtration unit 3, which removes solid particulate impurities that may have entered the wastewater during transportation or storage, preventing blockage of subsequent precision valves or impact on the quality of the urea solution. The purified hot wastewater is then pumped by recycled water pump 4 to urea dissolving tank 5 as dissolving makeup water, or to pipeline flushing circuit 6 as flushing water source.

[0026] This invention, through the construction of a complete physical chain encompassing collection, temperature regulation, filtration, and distribution, achieves tiered treatment and on-demand reuse of hot wastewater. Compared to the existing practice of directly discharging condensate, this system not only recovers valuable water resources and reduces the amount of fresh industrial water required, but also effectively avoids uneven urea dissolution or crystallization caused by temperature fluctuations due to pre-regulation of the water temperature, ensuring the process stability of the urea-to-ammonia system. By simultaneously supplying recycled water to both the dissolution and rinsing pathways, tiered utilization of water resources and a closed-loop circulation within the system are achieved.

[0027] Furthermore, the inlet of the collection box 1 is specifically connected to the steam heating and tracing unit 7 inside the urea station. The steam heating and tracing unit 7 is used to prevent the urea solution pipeline from crystallizing and clogging in a low-temperature environment, and it generates a large amount of high-temperature steam condensate during operation.

[0028] By directly connecting the collection tank 1 to the condensate outlet of the steam heating and heat tracing unit 7, this portion of condensate with high temperature and excellent water quality can be used as the main source of recycled water. On the one hand, high-grade demineralized water is recovered, reducing the operating load of the desalination and water treatment system; on the other hand, this water carries a large amount of low-grade waste heat, which can be directly introduced into the integrated recycled water tank 2. Its own heat can be used to raise the temperature of the mixed water, thereby significantly reducing the additional heating energy consumption required to meet the temperature required for urea dissolution, achieving dual recovery of water resources and heat energy.

[0029] In some embodiments, to further optimize the uniformity of the incoming water temperature in the collection tank 1, the integrated recycled water tank 2 in this embodiment includes a mixing component 21. The mixing component 21 specifically includes a mixing tank body 211, a stirring rod 212, and a motor 213.

[0030] Specifically, the mixing tank 211 serves as the primary containment chamber and is connected to the outlet of the collection tank 1. Since the water entering the collection tank 1 may be intermittently hot and condensate, while the existing water in the tank is at a lower temperature, direct stagnation would lead to severe water temperature stratification. Therefore, this invention includes a motor 213 positioned above the mixing tank 211. The output shaft of the motor 213 extends into the tank and is connected to the stirring rod 212. When the motor 213 drives the stirring rod 212 to rotate, it forcibly agitates the hot wastewater within the tank, promoting rapid convection mixing of the high-temperature and low-temperature water.

[0031] The wastewater recycling system of this invention breaks the temperature stratification phenomenon caused by natural convection through active mechanical stirring, making the temperature of the wastewater flowing out of the mixing tank 211 more uniform. This creates favorable conditions for the precise temperature adjustment of the subsequent cooling coil 222, avoids frequent operation of the subsequent temperature control system due to temperature fluctuations, and improves the stability and response speed of the system operation.

[0032] Furthermore, the stirring rod 212 includes a mounting shaft 2121, on which four sets of rods are spaced apart along its axial direction. Each rod set includes a mounting sleeve 2123 and multiple support rods 2122. The mounting sleeve 2123 is fixedly sleeved on the mounting shaft 2121, and the multiple support rods 2122 are evenly arranged on the mounting sleeve 2123 along the circumferential direction.

[0033] In some embodiments, a plurality of overflow holes 214 are provided at intervals along the circumferential direction on the upper side wall of the mixing chamber 211, and the plurality of overflow holes 214 are located on the same horizontal plane.

[0034] Specifically, when the water flow in collection tank 1 increases suddenly or the liquid surface fluctuates due to stirring by motor 213, the wastewater can overflow evenly in a circumferential direction through overflow hole 214 into the main tank space of integrated recycled water tank 2. The multi-point, coplanar overflow design effectively avoids localized short-flow or flow deviation caused by single-point overflow, ensuring the representativeness and stability of the effluent water quality. Simultaneously, the arrangement of overflow hole 214 prevents excessive liquid surface sloshing during high-flow-rate water intake, which could lead to tank structure resonance or sensor malfunctions, thus improving the safety and detection accuracy of the equipment.

[0035] In some embodiments, to precisely control the temperature of the uniformly mixed wastewater, the integrated recycled water tank 2 further includes a temperature regulating component 22. The temperature regulating component 22 includes a temperature regulating chamber 221 and a cooling coil 222 disposed within the temperature regulating chamber 221. The temperature regulating chamber 221 is pre-filled with a temperature regulating medium. The inlet end of the cooling coil 222 is connected to the mixing tank 211, and the outlet end is connected to the filter unit 3. The cooling coil 222 is arranged in a wavy, curved pattern.

[0036] Specifically, when the uniformly mixed hot wastewater flows through the corrugated cooling coil 222, heat is transferred to the temperature-regulating medium outside the coil through the coil wall. The use of a corrugated structure instead of a straight pipe design significantly extends the fluid flow path and heat exchange contact area within the same installation space. According to the principles of heat transfer, the heat exchange area is directly proportional to the amount of heat exchanged; therefore, the corrugated structure can significantly extend the residence time of the wastewater in the temperature-regulating medium, thereby achieving more thorough and efficient heat exchange.

[0037] The wastewater recycling system of this invention can quickly and stably cool the originally high-temperature hydrophobic water to a suitable range for urea dissolution without increasing the equipment size, ensuring the safe and stable operation of the subsequent recycled water pump and urea dissolution process, and effectively preventing the problem of high-temperature water damaging the pump seal or causing the urea solution to hydrolyze more rapidly.

[0038] In some embodiments, the system is equipped with a regulating valve 8 on the outlet pipeline of the recycled water pump 4. The inlet of the regulating valve 8 is connected to the recycled water pump 4, and the outlet is divided into two paths, which are connected to the urea dissolving tank 5 and the pipeline flushing circuit 6, respectively.

[0039] Specifically, since the water replenishment needs of the urea dissolving tank 5 and the flushing needs of the pipeline flushing circuit 6 are usually asynchronous and unequal, directly controlling them by starting and stopping the water pumps would not only damage the pump motors but also fail to meet the precise requirements of the process. By setting up a regulating valve 8, the flow rate of the heated wastewater entering the two pipelines can be dynamically adjusted according to the actual operating conditions.

[0040] The wastewater recycling and reuse system of this invention realizes on-demand allocation of recycled water resources, avoids water competition, ensures the priority of the urea dissolution process, and also meets the needs of intermittent high-flow rinsing, thereby improving the flexibility and process adaptability of the entire reuse system.

[0041] In some embodiments, the system is further provided with a wastewater tank 9. The inlet end of the wastewater tank 9 is connected not only to the end drain of the pipeline flushing circuit 6, but also to the equipment cooling water pipeline 10.

[0042] Specifically, in actual production, in addition to high-temperature heat tracing and drainage, the mechanical seal cooling water of the urea transfer pump, the equipment bearing cooling water, and the flushing water containing a small amount of urea crystal particles after pipeline flushing all need to be collected. This water is relatively low in temperature and may contain dissolved urea. Collecting them into wastewater tank 9 serves two purposes: firstly, it separates the low-temperature water source from the high-temperature drainage source for subsequent graded utilization of thermal energy; secondly, it concentrates this low-pollution water that was originally directly discharged, which can then be used as a supplementary water source for the integrated recycled water tank 2 or for other flushing applications with slightly lower water quality requirements. This expands the types of recycled water sources, achieves full coverage collection of almost all external drainage flows within the urea station area, and further improves the overall water recovery rate of the system.

[0043] In some embodiments, to achieve precise unattended control, the system further includes a control unit 11, a temperature sensor 12, and a level sensor 13. The control unit 11 is connected to the recycled water pump 4 and the regulating valve 8. The temperature sensor 12 and the level sensor 13 are both installed inside the integrated recycled water tank 2 and feed back real-time monitoring signals to the control unit 11.

[0044] Specifically, temperature sensor 12 monitors the water temperature in the integrated recycled water tank 2 in real time. When the control unit 11 receives a signal that the water temperature is higher than the set threshold, it will issue a command to increase the cooling medium flow rate of the temperature regulating component 22 or reduce the stirring speed. At the same time, it can also link the regulating valve 8 to appropriately reduce the outflow water to extend the cooling time. The liquid level sensor 13 is used to monitor the water level in the tank. When the liquid level is too low, the control unit 11 will reduce the power of the recycled water pump 4 or stop it to prevent the pump from running dry and being damaged. When the liquid level is too high, it will increase the power of the pump or open the regulating valve 8 to accelerate drainage and prevent overflow.

[0045] Through the logic of sensor perception, controller calculation, and actuator action, real-time dynamic adjustment of wastewater temperature, flow rate, and liquid level is achieved. This not only greatly reduces the inspection and operation intensity of operators and realizes automated operation, but also ensures that the system always operates at the optimal operating point through precise control logic. This guarantees the stringent water temperature requirements of the urea dissolution process while minimizing the power consumption of water pumps and refrigeration equipment, which is in line with the development trend of energy conservation and consumption reduction in smart power plants.

[0046] Furthermore, the temperature sensor 12 is located at the water outlet of the cooling coil 222, and the liquid level sensor 13 is located in the temperature control box 221.

[0047] The present invention also provides a wastewater recycling and reuse method, which is implemented based on any of the above system embodiments and specifically includes the following steps: Wastewater collection: High-temperature heat tracing condensate from steam-heated heat tracing unit 7 is collected centrally using collection box 1.

[0048] Temperature regulation: The hot wastewater in the collection tank 1 is introduced into the integrated recycled water tank 2. First, the mixing component 21 is used to eliminate water temperature stratification. Then, the corrugated cooling coil 222 in the temperature regulating component 22 exchanges heat with the temperature regulating medium to precisely regulate the water temperature to a suitable range of 25~50℃.

[0049] Filtration: The heated wastewater with a uniform and stable temperature is sent into the filtration unit 3 to intercept and remove scale, welding slag or other small solid particles that may be carried in the wastewater, ensuring the cleanliness of the recycled water.

[0050] Reuse and Distribution: Start the reclaimed water pump 4 to pressurize and deliver the filtered clean warm water. According to actual process requirements, the water flow is distributed to the urea dissolving tank 5 as makeup water for dissolving urea particles through the regulating valve 8, and / or distributed to the pipeline flushing circuit 6 to flush and replace easily crystallizing pipelines.

[0051] This method organically integrates physical collection, thermodynamic temperature control, mechanical filtration, and automatic distribution control steps to form a standardized wastewater treatment and reuse process. The beneficial effects of this method are: transforming previously disorderly discharged wastewater into an orderly reused resource; solving the temperature fluctuation problem in hydrophobic waste heat recovery through forced stirring and heat exchange; and eliminating the risk of blockage in the reuse water circuit through pre-filtration. Ultimately, it achieves efficient recovery and utilization of water resources and heat energy, significantly reducing the operating costs and environmental footprint of urea-ammonia production systems in thermal power plants.

[0052] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A wastewater recycling and reuse system, characterized in that, include: Collection box (1), the collection box (1) is used to collect hot wastewater; A comprehensive recycled water tank (2) is connected to the collection tank (1) so that the hot wastewater enters the comprehensive recycled water tank (2) and the comprehensive recycled water tank (2) is used to regulate the temperature of the hot wastewater. A filtration unit (3) is connected to the integrated recycled water tank (2) so that the heated wastewater after temperature adjustment enters the filtration unit (3) and the filtration unit (3) is used to filter the solids in the heated wastewater. A recycled water pump (4) is connected to the filter unit (3) so that the filtered hot wastewater enters the recycled water pump (4). The recycled water pump (4) is connected to the urea dissolving tank (5) and the pipeline flushing circuit (6). The recycled water pump (4) is used to pump the hot wastewater into the urea dissolving tank (5) and the pipeline flushing circuit (6).

2. The wastewater recycling system according to claim 1, characterized in that, The collection box (1) is connected to the steam heating and heat tracing unit (7), and the collection box (1) is used to collect the heat tracing condensate in the steam heating and heat tracing unit (7).

3. The wastewater recycling system according to claim 1, characterized in that, The integrated recycled water tank (2) includes a mixing component (21), which includes a mixing tank body (211), a stirring rod (212), and a motor (213). The mixing tank body (211) is connected to the collection tank (1) and is used to contain hot wastewater. The motor (213) is installed on the mixing tank body (211) and its output end is connected to the stirring rod (212). The stirring rod (212) is installed in the mixing tank body (211) and is used to stir the hot wastewater.

4. The wastewater recycling system according to claim 3, characterized in that, The mixing tank (211) is provided with a plurality of overflow holes (214), which are spaced apart along the circumferential direction on the mixing tank (211) and are located on the same horizontal plane.

5. The wastewater recycling system according to claim 3, characterized in that, The integrated recycled water tank (2) also includes a temperature regulating component (22), which includes a temperature regulating box (221) and a cooling coil (222). The temperature regulating box (221) contains a temperature regulating medium. The cooling coil (222) is installed in the temperature regulating box (221). One end of the cooling coil (222) is connected to the mixing tank (211), and the other end of the cooling coil (222) is connected to the filter unit (3). The cooling coil (222) is corrugated. The temperature regulating medium is used to adjust the temperature of the hot wastewater flowing through the cooling coil (222).

6. The wastewater recycling system according to claim 5, characterized in that, It also includes a regulating valve (8), the inlet of which is connected to the outlet of the recycled water pump (4), and the outlet of which is connected to the urea dissolving tank (5) and the pipeline flushing circuit (6). The regulating valve (8) is used to adjust the flow rate of the hot wastewater.

7. The wastewater recycling system according to claim 1, characterized in that, It also includes a wastewater tank (9), which is connected to the pipeline flushing circuit (6) and the equipment cooling water pipeline (10). The wastewater tank (9) is used to receive the flushing water from the pipeline flushing circuit (6) and the equipment cooling water.

8. The wastewater recycling system according to claim 6, characterized in that, It also includes a control unit (11), which is connected to the recycled water pump (4) and the regulating valve (8). The control unit (11) is used to adjust the power of the recycled water pump (4) and the control unit (11) is used to adjust the opening of the regulating valve (8).

9. The wastewater recycling system according to claim 8, characterized in that, It also includes a temperature sensor (12) and a liquid level sensor (13). The temperature sensor (12) is installed in the integrated recycled water tank (2) and is connected to the control unit (11). The temperature sensor (12) is used to monitor the temperature of the hot wastewater in the integrated recycled water tank (2). The liquid level sensor (13) is installed in the integrated recycled water tank (2) and is connected to the control unit (11). The liquid level sensor (13) is used to monitor the liquid level of the hot wastewater in the integrated recycled water tank (2).

10. A method for wastewater recycling and reuse, comprising a wastewater recycling and reuse system according to any one of claims 1-9, characterized in that, Includes the following steps: Wastewater collection: Collect hot wastewater using collection tanks; Temperature regulation: The hot wastewater in the collection tank is sent to the integrated recycled water tank to regulate the temperature of the hot wastewater; Filtration: The heated wastewater, after temperature adjustment, is sent into the filtration unit to remove solid impurities from the wastewater. Reuse and distribution: The filtered hot wastewater is pumped to the urea dissolving tank as dissolution makeup water using a recycled water pump, and / or pumped to the pipeline flushing circuit as flushing water source.

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