A device for deep treatment and reuse of circulating cooling wastewater from power plants

Abstract

This application discloses a device for deep treatment and reuse of circulating cooling wastewater from a power plant, relating to the technical field of wastewater treatment. It includes an equalization tank, a self-cleaning filter, a first safety filter, an ultrafiltration system, an intermediate water tank, a second safety filter, and a reverse osmosis system, connected sequentially along the water flow direction via pipelines. The self-cleaning filter includes a tank and a self-cleaning system. The tank is located between and connected to the equalization tank and the ultrafiltration system, and the self-cleaning system is located within the tank. A pipeline mixer is also provided between the intermediate water tank and the second safety filter. The pipeline mixer's dosing end is connected to a reducing agent dosing device and a scale inhibitor dosing device. The ultrafiltration system is equipped with a backwashing device. A chemical cleaning device is also provided, connected to both the ultrafiltration system and the reverse osmosis system. This application can reduce ultrafiltration membrane fouling and the frequency of shutdown flushing.

Description

Technical Field

[0001] This application relates to the technical field of wastewater treatment, and in particular to a device for deep treatment and reuse of circulating cooling wastewater from power plants. Background Technology

[0002] Circulating cooling water is mainly used in industries such as steel, metallurgy, power, chemical, and semiconductor. Its pollutant composition is relatively simple, primarily consisting of inorganic salt ions such as Na+, Ca2+, Mg2+, Cl-, and SO42-, with relatively low levels of organic pollutants. Statistics show that in 2023, China's industrial water consumption reached 97.02 billion cubic meters, accounting for 16.4% of the total national water consumption, with circulating cooling water accounting for over 70% of this. Therefore, the treatment and reuse of circulating cooling water is essential.

[0003] Currently, the main methods for treating circulating cooling water wastewater include softening sedimentation, biological treatment, and membrane separation. Softening sedimentation requires the addition of large amounts of chemical agents, resulting in high operating costs. It is also only effective at removing Ca2+ and Mg2+, with poor results for inorganic salt ions such as Na+, Cl-, and SO42-, as well as organic pollutants. Biological treatment has low operating costs, but it requires a large area and its treatment effect is generally limited, often failing to meet the standards for recycled water. Membrane separation processes produce high-quality effluent, especially the combination of ultrafiltration and reverse osmosis, which significantly improves effluent quality compared to the makeup water standards for open-loop circulating cooling water systems in the "Water Quality Standard for Industrial Water Use in Urban Wastewater Reuse" (GB / T 19923-2005). This technology has gradually become the mainstream process for circulating cooling water treatment.

[0004] However, in actual operation, the ultrafiltration + reverse osmosis process suffers from several drawbacks. Because the circulating water system is open, the wastewater often contains small amounts of leaves, algae, and silt. This wastewater directly enters the ultrafiltration unit, leading to severe membrane fouling, frequent shutdowns for flushing, and an ultrafiltration recovery rate typically below 90%. Furthermore, the circulating cooling water system usually requires the addition of oxidizing agents such as hypochlorous acid to inhibit algae growth. However, the residual hypochlorous acid oxidant in the water significantly damages the reverse osmosis membrane, resulting in a short membrane lifespan and high operating costs. Summary of the Invention

[0005] In order to reduce ultrafiltration membrane fouling and the frequency of shutdown flushing, this application provides a device for deep treatment and reuse of power plant circulating cooling wastewater.

[0006] This application provides a device for deep treatment and reuse of power plant circulating cooling wastewater, which adopts the following technical solution:

[0007] A device for deep treatment and reuse of circulating cooling wastewater from a power plant includes an equalization tank, a self-cleaning filter, a first safety filter, an ultrafiltration system, an intermediate water tank, a second safety filter, and a reverse osmosis system, which are connected sequentially by pipelines along the water flow direction.

[0008] The self-cleaning filter includes a tank and a self-cleaning system. The tank is located between and connected to the equalization tank and the ultrafiltration system, and the self-cleaning system is located in the tank.

[0009] A pipeline mixer is also provided between the intermediate water tank and the second security filter. The pipeline mixer is connected to a reducing agent dosing device and a scale inhibitor dosing device at its dosing end.

[0010] The ultrafiltration system is equipped with a backwashing device;

[0011] A chemical cleaning device is connected to both the ultrafiltration system and the reverse osmosis system.

[0012] By adopting the above technical solution, wastewater is first discharged into a regulating tank, and then pumped into a self-cleaning filter to remove impurities such as leaves, algae, and silt. The filtered wastewater then enters the first safety filter and ultrafiltration system for further removal of fine suspended solids and trace amounts of organic pollutants. The self-cleaning filter is equipped with a self-cleaning system; monitoring the pressure difference between the inlet and outlet of the filter effectively determines its clogging status. When the pressure difference reaches 50 kPa or higher, the filter is cleaned online, effectively reducing the possibility of ultrafiltration membrane fouling and decreasing the frequency of ultrafiltration cleaning, thus ensuring a stable ultrafiltration recovery rate of over 95%.

[0013] Optionally, the ultrafiltration system further includes an ultrafiltration membrane module;

[0014] The ultrafiltration membrane module has a backwash air inlet at the bottom, and a backwash water inlet and a filter water inlet are formed on the outer wall of the bottom of the ultrafiltration membrane module. The filter water inlet is connected to the first security filter.

[0015] The top outer wall of the ultrafiltration membrane module has a drain outlet and a product water outlet. The drain outlet is connected to a fly ash slurry preparation system, and the product water outlet is connected to the intermediate water tank.

[0016] The backwashing device includes a blower, pneumatic valves, a pressure relief valve, and a backwashing pump;

[0017] The blower outlet is sequentially connected to the pneumatic valve, the pressure relief valve, and the backwash air inlet;

[0018] The inlet of the backwash pump is connected to the intermediate water tank, and the outlet of the backwash pump is connected to the backwash inlet.

[0019] By adopting the above technical solution, the ultrafiltration membrane module design, through the backwash air inlet and water inlet at the bottom, and the drain outlet and product water outlet at the top, achieves effective filtration of wastewater and high-quality product water output. The fly ash slurry system connected to the drain outlet enables waste reuse. The backwashing device, through the cooperation of a blower, pneumatic valves, pressure relief valve, and backwash pump, enables regular backwashing of the ultrafiltration membrane module, effectively removing dirt from the filter membrane, extending the service life of the filter membrane, and ensuring the quality of the product water.

[0020] Optionally, the intermediate water tank is equipped with an acid dosing device, which includes an acid dosing tank and an acid metering pump;

[0021] The acid metering pump is located between and connected to the acid dosing tank and the intermediate water tank.

[0022] By adopting the above technical solution, the acid dosing device, through precise control of the acid dosing tank and acid metering pump, achieves pH adjustment of the water in the intermediate water tank, further improving water quality and providing better conditions for subsequent reverse osmosis treatment.

[0023] Optionally, the chemical cleaning device includes a cleaning tank, a chemical cleaning pump, an ultrafiltration chemical cleaning valve, and a reverse osmosis cleaning valve;

[0024] One end of the chemical cleaning pump is connected to the ultrafiltration chemical cleaning valve and the reverse osmosis chemical cleaning valve, respectively, and the other end is connected to the cleaning tank.

[0025] The reverse osmosis chemical cleaning valve is connected to the second security filter at the end furthest from the chemical cleaning pump.

[0026] The end of the ultrafiltration chemical cleaning valve furthest from the chemical cleaning pump is connected to the first security filter.

[0027] By adopting the above technical solution, the chemical cleaning device, through the synergistic action of the cleaning tank, chemical cleaning pump, ultrafiltration chemical cleaning valve, and reverse osmosis cleaning valve, achieves regular cleaning of the ultrafiltration system and reverse osmosis system, effectively removing dirt and deposits in the system and ensuring the long-term stable operation of the system.

[0028] Optionally, a filter chamber is formed inside the tank, and a water inlet pipe, a water delivery pipe, and a sewage discharge pipe are provided on the outer wall of the tank.

[0029] The inlet pipe is connected to the regulating tank, and the delivery pipe is connected to the first security filter;

[0030] The tank is provided with a partition plate located inside the filtration chamber, which divides the filtration chamber into a coarse filtration chamber, a fine filtration chamber, and a wastewater chamber, with the fine filtration chamber located between the coarse filtration chamber and the wastewater chamber;

[0031] The partition plate includes a first partition plate and a second partition plate, the first partition plate being located between the coarse filter chamber and the fine filter chamber, and the second partition plate being located between the fine filter chamber and the sewage discharge chamber;

[0032] The water inlet pipe is connected to the coarse filter chamber, the water delivery pipe is connected to the fine filter chamber, and the sewage discharge pipe is connected to the sewage chamber.

[0033] A coarse filter screen located in the coarse filtration chamber is provided on the partition plate away from the sewage chamber, and a fine filter screen located in the fine filtration chamber is provided between adjacent partition plates;

[0034] A connecting hole is formed in the middle of the first partition plate, and the fine filter screen covers the connecting hole;

[0035] The second partition plate is rotatably connected to a drain pipe extending into the fine filter chamber, and a sewage pump connected to the drain pipe is provided on the outer wall of the tank.

[0036] The sewage pipe has a sewage hole that communicates with the fine filter chamber, and the sewage pipe has an outlet that communicates with the sewage chamber.

[0037] The first partition plate is rotatably connected to a connecting ring on the side near the fine filter chamber. Multiple dirt collection plates are evenly spaced along the circumference of the connecting ring, and dirt collection grooves are formed in the dirt collection plates.

[0038] The sludge collection plate surrounds the drain pipe, and the drain pipe is provided with a connecting pipe that connects to the sludge collection plate. The connecting pipe connects the sludge collection tank and the drain pipe.

[0039] The two opposite sides of the sludge collection plate are respectively formed with collection ports. The sludge collection plate is slidably connected with a sealing plate corresponding to each collection port. The sludge collection plate is provided with an elastic driving member to drive the sealing plate to block the collection port.

[0040] The tank is equipped with a power component that drives the sewage pipe to rotate;

[0041] The first partition plate is equipped with a control component. When the sludge collection plate flips from a horizontal state to a vertical state, the control component controls the corresponding sealing plate located above to open the collection port.

[0042] When the sludge collection plate flips from a vertical to a horizontal position, the control component controls the corresponding sealing plate located above to open the collection port.

[0043] By adopting the above technical solution, the partition plate design inside the tank divides the filtration chamber into a coarse filtration chamber, a fine filtration chamber, and a wastewater chamber, achieving multi-stage filtration of wastewater and improving filtration efficiency. The coarse and fine filter screens effectively remove impurities from the water. The coordination of the drain pipe, sludge collection plate, control components, and power components enables automatic collection and discharge of dirt from the fine filter screen, reducing the frequency of manual cleaning and improving the automation level of the equipment.

[0044] Optionally, the control component includes a control ring, a control bar, and a control column;

[0045] The control columns are disposed on the sealing plate and correspond one-to-one with each other. Adjacent control columns are staggered with each other. The control columns slide and protrude out of the sludge collection plate.

[0046] The control ring is disposed on the side of the first partition plate near the second partition plate, and the control column is slidably connected to the outer periphery of the control ring. At this time, the sealing plate blocks the collection port.

[0047] Multiple control strips are offset and located on the outer periphery of the connecting ring. The control strips are inclined to form a sliding surface. The control column slides along the sliding surface to the side of the control strip away from the control ring. At this time, the sealing plate opens the collection port.

[0048] By adopting the above technical solution, the control component, through the ingenious design of the control ring, control strip, and control column, achieves precise control of the sealing plate on the sludge collection plate. When the sludge collection plate flips, the control column slides along the sliding surface, controlling the sealing plate to open or close the collection port, realizing the automatic collection and discharge of dirt and improving the operating efficiency of the equipment.

[0049] Optionally, the control column has an arc-shaped structure on the side away from the sealing plate.

[0050] By adopting the above technical solution, the arc-shaped structure design of the control column makes the control column slide more smoothly, reduces friction and resistance between it and the control bar, and extends the service life of the equipment.

[0051] Optionally, the elastic driving component is a driving spring, the sealing plate is provided with a slider, and the sludge collection plate is provided with a groove for the slider to slide.

[0052] The drive spring is installed in the slide groove and slides toward the control ring.

[0053] By adopting the above technical solution, the drive spring provides a stable driving force for the sealing plate, ensuring that the sealing plate can quickly seal the collection port when needed, reducing dirt leakage. At the same time, the elastic design of the drive spring also allows the sealing plate to flexibly open or close the collection port when the control column slides, improving the flexibility of the equipment.

[0054] Optionally, the sludge collection plate is provided with cleaning bristles on the side away from the drain pipe, and the cleaning bristles slide in contact with the inner peripheral sidewall of the fine filter screen.

[0055] By adopting the above technical solution, the cleaning brush design on the dirt collection plate effectively removes dirt and impurities from the fine filter screen through sliding contact with the inner circumferential sidewall, ensuring the filtration effect of the fine filter screen. At the same time, the cleaning brush design also reduces the frequency of manual cleaning of the fine filter screen, improving the operating efficiency of the equipment.

[0056] Optionally, the outer wall of the sludge collection plate is inclined and symmetrically formed with a collection surface connecting the collection port.

[0057] By adopting the above technical solution, the collection surface design formed by the inclined and symmetrical outer wall of the sludge collection plate enables the collection port to better receive and collect dirt, thereby improving the dirt collection efficiency.

[0058] In summary, this application includes at least one of the following beneficial effects:

[0059] 1. By setting up a self-cleaning filter, impurities such as leaves, algae and silt in the circulating cooling wastewater can be effectively intercepted, reducing ultrafiltration membrane fouling and the frequency of shutdown flushing, so that the water recovery rate of the ultrafiltration system can reach more than 95%.

[0060] 2. The internal partition design divides the filtration chamber into a coarse filter chamber, a fine filter chamber, and a wastewater chamber, achieving multi-stage filtration of wastewater and improving filtration efficiency. The coarse and fine filter screens effectively remove impurities from the water. The coordinated operation of the drain pipe, sludge collection plate, control components, and power components enables automatic collection and discharge of dirt from the fine filter screen, reducing the frequency of manual cleaning and increasing the automation level of the equipment. Attached Figure Description

[0061] Figure 1 This is a schematic diagram of the connection structure of the recycling device in Embodiment 1 of this application;

[0062] Figure 2 This is a schematic diagram of the structure of the self-cleaning filter in Embodiment 1 of this application;

[0063] Figure 3 This is a schematic diagram of the structure of the ultrafiltration membrane module in Embodiment 1 of this application;

[0064] Figure 4This is a schematic diagram of the external structure of the tank in Embodiment 2 of this application;

[0065] Figure 5 This is a schematic diagram of the internal cross-section of the tank in Embodiment 2 of this application;

[0066] Figure 6 This is a schematic diagram of the connection structure between the sewage collection plate and the sewage pipe in Embodiment 2 of this application;

[0067] Figure 7 yes Figure 6 Enlarged schematic diagram of part A;

[0068] Figure 8 This is a schematic diagram of the internal cross-section of the sludge collection plate in Embodiment 2 of this application.

[0069] Reference numerals: 1. Equalization tank; 11. Inlet pump; 12. First level gauge; 2. Self-cleaning filter; 21. Tank body; 211. Filter chamber; 2111. Coarse filter chamber; 2112. Fine filter chamber; 2113. Sewage chamber; 212. Inlet pipe; 213. Water supply pipe; 214. Sewage drain pipe; 215. Divider plate; 2151. First divider plate; 2152. Second divider plate; 2153. Connecting hole; 2154. Sewage drain pipe; 2155. Sewage hole; 2156. Connecting pipe; 2157. Outlet; 216. Coarse filter screen; 217. Fine filter screen; 218. Sewage pump; 219. Connecting ring; 2191. Sludge collection plate; 2192. Sludge collection tank; 2193. Collection surface; 2194. Collection port; 2195. Sealing plate; 2196. Drive spring; 2197. Slider; 2198. Slide groove; 2199. Cleaning brush bristles; 22. Self-cleaning system; 221. First pressure gauge; 222. Second pressure gauge; 223. Time controller; 23. Power motor; 3. First safety filter; 4. Ultrafiltration system; 41. Ultrafiltration membrane module; 411. Backwash 412. Air inlet; 413. Backwash water inlet; 414. Filter water inlet; 415. Sewage outlet; 416. Water production outlet; 42. Fly ash slurry system; 43. Backwash device; 431. Blower; 432. Pneumatic valve; 433. Pressure relief valve; 434. Backwash pump; 5. Intermediate water tank; 51. Acid dosing device; 511. Acid dosing tank; 512. Acid metering pump; 52. Agitator; 53. Online pH meter; 54. Pipeline mixer; 55. Reducing agent dosing device; 551. Reducing agent tank; 552. Reducing agent metering pump; 56. Antiscalant dosing device; 561. Antiscalant tank; 562. Antiscalant metering pump; 57. Reverse osmosis feed pump; 58. Second level gauge; 6. Second safety filter; 61. First online conductivity meter; 62. Online ORP meter; 7. Reverse osmosis system; 71. Second online conductivity meter; 8. Chemical cleaning device; 81. Cleaning tank; 82. Chemical cleaning pump; 83. Ultrafiltration chemical cleaning valve; 84. Reverse osmosis cleaning valve; 9. Control components; 91. Control ring; 92. Control bar; 921. Sliding surface; 93. Control column. Detailed Implementation

[0070] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0071] This application discloses a device for deep treatment and reuse of circulating cooling wastewater from a power plant.

[0072] Example 1

[0073] See Figure 1The treatment and reuse device includes a regulating tank 1, a self-cleaning filter 2, a first safety filter 3, an ultrafiltration system 4, an intermediate water tank 5, a second safety filter 6, and a reverse osmosis system 7, which are connected sequentially through pipes along the water flow direction. In use, wastewater is first introduced into the regulating tank 1 through pipes, and then sequentially passes through the self-cleaning filter 2, the first safety filter 3, the ultrafiltration system 4, the intermediate water tank 5, the second safety filter 6, and the reverse osmosis system 7 for treatment until it meets the standards, and then outputs from the reverse osmosis system 7 for reuse.

[0074] An inlet pump 11 is connected between the equalization tank 1 and the self-cleaning filter 2 to pump wastewater from the equalization tank 1 into the self-cleaning filter 2. The equalization tank 1 is equipped with a first level gauge 12, which can trigger a high-level alarm based on three preset levels: high, medium, and low. When the wastewater in the equalization tank 1 is at the medium or low level, the inlet pump 11 automatically stops. When the level reaches high, the inlet pump 11 automatically restarts to pump the wastewater out of the equalization tank 1 and pump it back into the equalization tank 1.

[0075] The self-cleaning filter 2 includes a tank 21 and a self-cleaning system 22. The tank 21 is located between and connected to the equalization tank 1 and the ultrafiltration system 4. The self-cleaning system 22 is located on the tank 21 and is used to control the self-cleaning operation of the tank 21. The self-cleaning system 22 includes a first pressure gauge 221, a second pressure gauge 222, a time controller 223, and a cleaning motor. The first pressure gauge 221 is installed on the pipe at the inlet end of the tank 21, and the second pressure gauge 222 is installed on the pipe at the outlet end of the tank 21 to monitor the pressure of the wastewater in the pipes at the inlet and outlet ends of the tank 21. The cleaning motor is installed on the top of the tank 21 to clean the tank 21, and the time controller 223 is installed on the outer surface of the tank 21 to monitor the processing time.

[0076] When wastewater from the equalization tank 1 flows into the self-cleaning filter 2, the filter effectively traps impurities such as leaves, algae, and silt, reducing ultrafiltration membrane fouling and the frequency of shutdown flushing, thus achieving a water recovery rate of over 95% for the ultrafiltration system 4. Afterward, the filtered wastewater enters the first safety filter 3, where fine particles are further filtered. The first safety filter 3 then supplies the re-filtered wastewater into the ultrafiltration system 4.

[0077] The ultrafiltration system 4 also includes an ultrafiltration membrane module 41. A backwash air inlet 411 is formed at the bottom of the ultrafiltration membrane module 41. A backwash water inlet 412 and a filter water inlet 413 are formed on the outer wall of the bottom of the ultrafiltration membrane module 41. The filter water inlet 413 is connected to the first safety filter 3. A drain outlet 414 and a product water outlet 415 are formed on the outer wall of the top of the ultrafiltration membrane module 41. The drain outlet 414 is connected to a fly ash slurry preparation system 42, and the product water outlet 415 is connected to the intermediate water tank 5.

[0078] The ultrafiltration system 4 is equipped with a backwashing device 43, which includes a blower 431, a pneumatic valve 432, a pressure relief valve 433, and a backwashing pump 434. The outlet of the blower 431 is sequentially connected to the pneumatic valve 432, the pressure relief valve 433, and the backwashing air inlet 411. The inlet of the backwashing pump 434 is fixedly connected to and in communication with the intermediate water tank 5, and the outlet of the backwashing pump 434 is connected to the backwashing water inlet 412.

[0079] An acid dosing device 51 is installed on the intermediate water tank 5. The acid dosing device 51 includes an acid dosing tank 511 and an acid metering pump 512. The acid metering pump 512 is located between the intermediate water tank 5 and the acid dosing tank 511 and is connected to it. The acid metering pump 512 draws acid from the acid dosing tank 511 and then inputs it into the intermediate water tank 5.

[0080] The intermediate water tank 5 is equipped with a stirrer 52 and an online pH meter 53, which is linked to the acid metering pump 512 and can automatically control the start and stop of the acid metering pump 512 based on the online pH monitoring data. In this embodiment, the pH value of the water flowing in the intermediate water tank 5 is controlled between 6.5 and 7.2.

[0081] A pipeline mixer 54 is also connected between the intermediate water tank 5 and the second safety filter 6. The dosing end of the pipeline mixer 54 is connected to a reducing agent dosing device 55 and a scale inhibitor dosing device 56. The scale inhibitor dosing device 56 includes a scale inhibitor tank 561 and a scale inhibitor metering pump 562. The scale inhibitor metering pump 562 is located between and connected to the pipeline mixer 54 and the scale inhibitor tank 561. The scale inhibitor metering pump 562 draws the scale inhibitor from the scale inhibitor tank 561 and then inputs it into the pipeline mixer 54. The reducing agent dosing device 55 includes a reducing agent tank 551 and a reducing agent metering pump 552. The reducing agent metering pump 552 is located between and connected to the pipeline mixer 54 and the reducing agent tank 551. The reducing agent metering pump 552 draws the reducing agent from the reducing agent tank 551 and then inputs it into the pipeline mixer 54.

[0082] A reverse osmosis feed pump 57 is installed between the pipeline mixer 54 and the intermediate water tank 5. During use, the reverse osmosis feed pump 57 draws out the mixed wastewater from the intermediate water tank 5 and then feeds it into the pipeline mixer 54. A second level gauge 58 is also installed in the intermediate water tank 5. The second level gauge 58 is linked to the reverse osmosis feed pump 57, so that the reverse osmosis feed pump 57 automatically stops when the liquid level is low and automatically starts when the liquid level is high.

[0083] A first online conductivity meter 61 is installed on the water pipe between the second security filter 6 and the reverse osmosis system 7. The first online conductivity meter 61 is linked with the scale inhibitor metering pump 562. The frequency of the scale inhibitor metering pump 562 can be controlled by the conductivity of the inlet water to achieve precise dosing of the scale inhibitor.

[0084] An online ORP meter 62 is installed on the water pipe between the second security filter 6 and the reverse osmosis system 7. The online ORP meter 62 is located between the first online conductivity meter 61 and the reverse osmosis system 7. The online ORP meter 62 is linked to the reducing agent metering pump 552. The frequency of the reducing agent metering pump 552 can be adjusted by the ORP level of the influent, thereby adjusting the dosage of the reducing agent and controlling the ORP of the reverse osmosis influent between +50mV and +150mV, reducing the possibility of oxidation damage to the reverse osmosis membrane. A second online conductivity meter 71 is also installed at the reverse osmosis outlet of the reverse osmosis system 7 for real-time monitoring of the system's effluent water quality. Once the effluent from the reverse osmosis system 7 meets the standards, it can be reused.

[0085] The treatment and reuse device also includes a chemical cleaning device 8, which is connected to both the ultrafiltration system 4 and the reverse osmosis system 7, and is used to chemically clean these systems. The chemical cleaning device 8 includes a cleaning tank 81, a chemical cleaning pump 82, an ultrafiltration chemical cleaning valve 83, and a reverse osmosis cleaning valve 84. One end of the chemical cleaning pump 82 is connected to both the ultrafiltration chemical cleaning valve 83 and the reverse osmosis cleaning valve 84, and the other end is connected to the cleaning tank 81. The end of the reverse osmosis cleaning valve 84 furthest from the chemical cleaning pump 82 is connected to the second security filter 6, and the end of the ultrafiltration chemical cleaning valve 83 furthest from the chemical cleaning pump 82 is connected to the first security filter 3.

[0086] The implementation principle of the deep treatment and reuse device for power plant circulating cooling wastewater in Embodiment 1 of this application is as follows:

[0087] Wastewater is first discharged into equalization tank 1, and then pumped into self-cleaning filter 2 by inlet pump 11 to remove impurities such as leaves, algae, and silt. The filtered wastewater then enters the first safety filter 3 and ultrafiltration system 4 for further removal of fine suspended solids and trace amounts of organic pollutants. Simultaneously, self-cleaning filter 2 is equipped with a self-cleaning system 22. Monitoring the pressure difference between the inlet and outlet of self-cleaning filter 2 effectively determines its clogging status. When the pressure difference reaches 50 kPa or higher, the cleaning motor starts to perform online cleaning of self-cleaning filter 2, effectively reducing the possibility of ultrafiltration membrane fouling and decreasing the frequency of ultrafiltration cleaning, ensuring a stable ultrafiltration recovery rate of over 95%. The water produced after ultrafiltration flows into intermediate water tank 5, where sulfuric acid, hydrochloric acid, or citric acid is added via acid dosing device 51 to adjust the pH value of the wastewater to between 6.8 and 7.2. Water from intermediate tank 5 is pumped by reverse osmosis feed pump 57 and then sequentially enters pipeline mixer 54, second safety filter 6, and reverse osmosis system 7. Pipeline mixer 54 is equipped with antiscalant and reducing agent dosing devices 55. The pipeline between reverse osmosis system 7 and second safety filter 6 is also equipped with a first online conductivity meter 61 and an online ORP meter 62. These allow for real-time monitoring of the reverse osmosis feed water conductivity and ORP value, enabling adjustment of the antiscalant and reducing agent dosages. When the reverse osmosis feed water conductivity is between 1500-5000 μs / cm, the antiscalant dosage is controlled at 5-25 ppm; the reverse osmosis feed water ORP value is controlled between +50mV and +150mV, effectively reducing reverse osmosis membrane fouling and the possibility of membrane oxidation damage, thus extending membrane lifespan. Ultrafiltration system 4 is equipped with a backwashing device 43, which performs backwashing every 20-60 minutes during ultrafiltration operation to maintain the stability of the ultrafiltration permeate. The ultrafiltration system 4 and the reverse osmosis system 7 are also equipped with a shared chemical cleaning device 8, which performs chemical cleaning every 20-40 days. The cleaning water from the ultrafiltration system 4 and the reverse osmosis system 7, along with a small amount of reverse osmosis concentrate, is discharged into the power plant fly ash pulping system 42 for pulping. The water produced by the reverse osmosis system 7 is recycled to the power plant's circulating cooling water system after meeting the standards.

[0088] Example 2

[0089] See Figure 4 and Figure 5 The difference between Embodiment 2 and Embodiment 1 is that a filter chamber 211 is formed inside the tank 21, and the filter chamber 211 has a cylindrical cavity structure and extends horizontally. An inlet pipe 212, a delivery pipe 213, and a drain pipe 214 are formed on the outer wall of the tank 21. The inlet pipe 212 is connected to the water pump 11, and the delivery pipe 213 is connected to the first security filter 3 (the first security filter 3 is located in...). Figure 1 (Winning bid) Connected to the network.

[0090] A partition plate 215 is fixedly installed on the tank body 21. The partition plate 215 has a circular plate structure, and there are two partition plates 215 located inside the filter chamber 211. The central axis of the partition plate 215 coincides with the central axis of the filter chamber 211. The partition plate 215 includes a first partition plate 2151 and a second partition plate 2152. The first partition plate 2151 and the second partition plate 2152 divide the filter chamber 2111 into a coarse filter chamber 2111, a fine filter chamber 2112, and a wastewater chamber 2113. The fine filter chamber 2112 is located between the coarse filter chamber 2111 and the wastewater chamber 2113. The first partition plate 2151 is located between the coarse filter chamber 2111 and the fine filter chamber 2112, and the second partition plate 2152 is located between the fine filter chamber 2112 and the wastewater chamber 2113.

[0091] The inlet pipe 212 is connected to the coarse filter chamber 2111 and is used to feed water into the coarse filter chamber 2111. The outlet pipe 213 is connected to the fine filter chamber 2112, and the wastewater after fine filtration is discharged through the outlet pipe 213. The drain pipe 214 is connected to the sewage chamber 2113, and the impurities after fine filtration enter the sewage chamber 2113 and are then discharged through the drain pipe 214.

[0092] A coarse filter screen 216 is fixedly connected to the end face of the first partition plate 2151 away from the sewage chamber 2113. The coarse filter screen 216 has a cylindrical cover structure, and there is a gap between the outer peripheral wall of the coarse filter screen 216 and the peripheral wall of the coarse filter chamber 2111. When wastewater enters the coarse filter chamber 2111, impurities such as leaves, algae, and silt in the wastewater are filtered by the coarse filter screen 216 and remain between the coarse filter screen 216 and the peripheral wall of the coarse filter chamber 2111, while the filtered wastewater enters the coarse filter screen 216.

[0093] A connecting hole 2153 is formed in the middle of the first partition plate 2151, which connects the coarse filtration chamber 2111 and the fine filtration chamber 2112. The coarsely filtered wastewater enters the fine filtration chamber 2112 through the connecting hole 2153. A fine filter screen 217 is fixedly connected between the first partition plate 2151 and the second partition plate 2152. The fine filter screen 217 is located in the fine filtration chamber 2112 and covers the connecting hole 2153. There is a gap between the fine filter screen 217 and the peripheral wall of the fine filtration chamber 2112. After the coarsely filtered wastewater is filtered through the fine filter screen 217, the fine particulate impurities in the wastewater remain in the fine filter screen 217, while the finely filtered wastewater enters the space between the fine filter screen 217 and the peripheral wall of the fine filtration chamber 2112, and is finally discharged from the fine filtration chamber 2112 through the water supply pipe 213.

[0094] A drain pipe 2154 is rotatably connected to the second partition plate 2152, and the drain pipe 2154 extends into the fine filtration chamber 2112. The drain pipe 2154 is coaxially arranged with the second partition plate 2152, and the drain pipe 2154 can slide axially on the second partition plate 2152. Multiple sewage holes 2155 are formed on the drain pipe 2154, spaced apart, and the sewage holes 2155 communicate with the fine filtration chamber 2112. Multiple water outlets 2157 are formed on the drain pipe 2154, spaced apart circumferentially, and the water outlets 2157 communicate with the sewage chamber 2113. A sewage pump 218 is fixedly installed on the outer wall of the tank 21, and the inlet of the sewage pump 218 is connected to the drain pipe 214. The outlet side of the sewage pump 218 is connected to the discharge pipe. When the sewage pump 218 is started, fine particulate impurities in the fine filter chamber 2112 enter the sewage pipe 2154 through the sewage hole 2155, then enter the sewage chamber through the sewage pipe 2154, and finally are pumped out by the sewage pump 218.

[0095] A connecting ring 219 is rotatably connected to the first partition plate 2151 near the fine filter chamber 2112. The connecting ring 219 is coaxially arranged with the drain pipe 2154. A sludge collection plate 2191 is fixedly connected to the connecting ring 219. The sludge collection plate 2191 extends towards the second partition plate 2152. There are multiple sludge collection plates 2191, which are evenly spaced circumferentially and surround the drain pipe 2154. A cleaning brush bristle 2199 is fixedly connected to the side of the sludge collection plate 2191 away from the drain pipe 2154. There are multiple cleaning brush bristles 2199, which are evenly spaced and slide in contact with the inner circumferential sidewall of the fine filter screen 217.

[0096] A sludge collection trough 2192 is formed inside the sludge collection plate 2191. A connecting pipe 2156 is fixedly connected to the outer wall of the drain pipe 2154. The connecting pipe 2156 corresponds one-to-one with the sludge collection plate 2191. The end of the connecting pipe 2156 away from the drain pipe 2154 is connected and fixed to the side wall of the sludge collection plate 2191 near the drain pipe 2154. The connecting pipe 2156 connects the sludge collection trough 2192 and the drain pipe 2154.

[0097] A connection port is formed on the side of the sludge collection plate 2191 near the drain pipe 2154. Connecting grooves extending axially along the drain pipe 2154 are formed on the opposite side walls of the connection port. A connecting plate is slidably connected to the side of the sludge collection plate 2191 near the drain pipe 2154, with both ends of the connecting plate slidably connected to the connecting grooves on both sides. The connecting plate seals the connection port, and the opposite side walls of the connecting plate slide in contact with the opening wall of the connection port, thus sealing the connection port. The connecting pipe 2156 is fixedly connected to the connecting plate. When the drain pipe 2154 slides axially, the connecting plate slides within the connecting groove, ensuring that the connecting pipe 2156 remains connected to both the sludge collection tank 2192 and the drain pipe 2154 while moving with the drain pipe 2154.

[0098] See Figure 5 and Figure 6 Collection ports 2194 are formed on the opposite sides of the collection plate 2191. The outer wall of the collection plate 2191 is inclined and symmetrically formed with a gathering surface 2193 connecting the collection ports 2194. The two gathering surfaces 2193 extend inclinedly upward from the side near the collection port 2194 toward the drain pipe 2154 and the periphery of the fine filter chamber 2112, respectively.

[0099] See Figure 6 and Figure 7 Each sludge collection plate 2191 is slidably connected to a sealing plate 2195, with each sealing plate 2195 corresponding to a collection port 2194. A "T"-shaped slider 2197 is fixedly connected to the side wall of the sealing plate 2195. A "T"-shaped groove 2198 is formed on the wall of the sludge collection tank 2192, extending towards the drain pipe 2154. The slider 2197 is slidably connected within the groove 2198, enabling a sliding connection between the sealing plate 2195 and the sludge collection plate 2191.

[0100] The collection plate 2191 is equipped with an elastic drive element for driving the sealing plate 2195 to block the collection port 2194. The elastic drive element is a drive spring 2196, which is installed in the slide groove 2198. One end of the drive spring 2196 abuts against the side of the slider 2197 away from the drain pipe 2154, and the other end abuts against the wall of the slide groove 2198. When the drive spring 2196 is released elastically, it pushes the sealing plate 2195 to slide towards the drain pipe 2154 until the end of the slider 2197 away from the drive spring 2196 abuts against the wall of the slide groove 2198, at which point the sealing plate 2195 blocks the collection port 2194.

[0101] See Figure 4 and Figure 5 The tank body 21 is equipped with a power component for driving the sewage pipe 2154 to rotate. The power component is a motor 23. A support plate is fixedly connected to the outer wall of the tank body 21, and the motor 23 is mounted on the support plate. The output shaft of the motor 23 is rotatably connected to the tank body 21 and fixedly connected to the sewage pipe 2154. When the motor 23 starts, it drives the sewage pipe 2154 to rotate. At this time, the connecting pipe 2156 is linked to the sludge collection plate 2191, so that the sludge collection plate 2191 rotates with the sewage pipe 2154.

[0102] See Figure 5 and Figure 6The first partition plate 2151 is provided with a control component 9. When the sludge collection plate 2191 flips from a horizontal state to a vertical state, the control component 9 controls the corresponding sealing plate 2195 located above to open the collection port 2194. When the sludge collection plate 2191 flips from a vertical state to a horizontal state, the control component 9 controls the corresponding sealing plate 2195 located above to open the collection port 2194.

[0103] The control component 9 includes a control ring 91, a control strip 92, and a control column 93. The control column 93 is slidably connected to the sludge collection plate 2191 along the direction of the water discharge pipe 2154. There are multiple sets of control columns 93, each set of control columns 93 corresponding to one sludge collection plate 2191. Each set of control columns 93 has two columns, which correspond one-to-one with the sealing plate 2195. The control columns 93 are fixedly connected to the sealing plate 2195, and the control columns 93 in the same set are staggered along the axis of the discharge pipe 2154. The control columns 93 protrude outwards from the sludge collection plate 2191 in the direction of the discharge pipe 2154.

[0104] The control ring 91 is fixedly connected to the side of the first partition plate 2151 near the second partition plate 2152. The control column 93 has an arc-shaped structure on the side away from the sealing plate 2195. The arc-shaped structure is slidably connected to the outer periphery of the control ring 91. At this time, the sealing plate 2195 blocks the collection port 2194.

[0105] See Figure 8 The control strip 92 is fixedly connected to the outer periphery of the control ring 91, and one end of the control strip 92 is inclined to form a sliding surface 921. When the collection plate 2191 rotates with the drain pipe 2154, the control column 93 slides from the outer periphery of the control ring 91 onto the sliding surface 921, and then slides through the sliding surface 921 to the side of the control strip 92 away from the control ring 91. At this time, the sealing plate 2195 opens the collection port 2194.

[0106] See Figure 7 and Figure 8There are two control bars 92, each corresponding to one of the two control columns 93 in the same group. The two control bars 92 are staggered and adjacent to each other. When the sludge collection plate 2191 moves from a horizontal to a vertical position, the control column 93 corresponding to the upper sealing plate 2195 slides on one of the control bars 92, while the other control column 93 slides on the outer peripheral side wall of the control ring 91. At this time, the collection port 2194 on the upper side of the sludge collection plate 2191 opens, and the fine particles of impurities brushed off by the cleaning bristles 2199 on the fine filter screen 217 and falling on the sludge collection plate 2191 enter the sludge collection tank 2192 along the collection surface 2193 and through the collection port 2194. When the sludge collection plate 2191 moves from a vertical to a horizontal position, the control column 93 separates from the control bar 92. At this time, the drive spring 2196 pushes the corresponding control column 93 to abut against the outer periphery of the control ring 91. Simultaneously, another control column 93 slides from the outer periphery of the control ring 91 onto the sliding surface 921 and slides through the sliding surface 921 to the side of the control bar 92 away from the control ring 91. During the movement of the sludge collection plate 2191 from a vertical to a horizontal position, the corresponding sealing plate 2195 at the top opens the collection port 2194, and the brushed-off impurities enter the sludge collection tank 2192 again through the collection port 2194. This is beneficial for collecting fine particulate impurities in the fine filter chamber 2112, reducing the number of fine particulate impurities in the fine filter chamber 2112, and improving the wastewater filtration effect of the fine filter screen 217.

[0107] See Figure 5 When the sewage pump 218 starts, the fine particulate impurities collected in the sludge collection tank 2192 are drawn into the sewage discharge pipe 2154. At the same time, the sewage outlet 2155 draws the fine particulate impurities from the fine filter chamber 2112 into the sewage discharge chamber, and then discharges them through the sewage pump 218. To improve the sewage discharge effect, a cylinder is installed and fixed on the support plate. The piston rod of the cylinder is fixedly connected to the power motor 23, which drives the power motor 23 to move axially along the sewage discharge pipe 2154, thereby increasing the range of fine particulate impurities drawn by the sewage outlet 2155.

[0108] The implementation principle of the deep treatment and reuse device for power plant circulating cooling wastewater in Embodiment 2 of this application is as follows:

[0109] In operation, wastewater enters the coarse filter chamber 2111, where the coarse filter screen 216 filters out impurities such as leaves, algae, and silt. The coarsely filtered wastewater then flows into the fine filter chamber 2112, where the fine filter screen 217 filters out fine particulate impurities before discharging. During the filtration process, the cleaning brush 2199 cleans impurities from the fine filter screen 217, while the collection plate 2191 collects the fine particulate impurities filtered within the fine filter chamber 2112, reducing the number of fine particulate impurities and improving the filtration effect.

[0110] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for deep treatment and reuse of circulating cooling wastewater from power plants, characterized in that: It includes a regulating tank (1), a self-cleaning filter (2), a first security filter (3), an ultrafiltration system (4), an intermediate water tank (5), a second security filter (6), and a reverse osmosis system (7) connected sequentially by pipes along the water flow direction; The self-cleaning filter (2) includes a tank (21) and a self-cleaning system (22). The tank (21) is located between and connected to the regulating tank (1) and the ultrafiltration system (4). The self-cleaning system (22) is located in the tank (21). A pipeline mixer (54) is also provided between the intermediate water tank (5) and the second security filter (6). The pipeline mixer (54) is connected to a reducing agent dosing device (55) and a scale inhibitor dosing device (56) at the dosing end. The ultrafiltration system (4) is equipped with a backwashing device (43); Chemical cleaning device (8), which is connected to the ultrafiltration system (4) and the reverse osmosis system (7) respectively. A filter chamber (211) is formed inside the tank (21), and a water inlet pipe (212), a water delivery pipe (213), and a sewage discharge pipe (214) are provided on the outer wall of the tank (21). The inlet pipe (212) is connected to the regulating tank (1), and the water delivery pipe (213) is connected to the first security filter (3); The tank (21) is provided with a partition plate (215) located in the filter chamber (211). The partition plate (215) divides the filter chamber (211) into a coarse filter chamber (2111), a fine filter chamber (2112), and a sewage chamber (2113). The fine filter chamber (2112) is located between the coarse filter chamber (2111) and the sewage chamber (2113). The partition plate (215) includes a first partition plate (2151) and a second partition plate (2152). The first partition plate (2151) is located between the coarse filter chamber (2111) and the fine filter chamber (2112), and the second partition plate (2152) is located between the fine filter chamber (2112) and the sewage discharge chamber. The water inlet pipe (212) is connected to the coarse filter chamber (2111), the water delivery pipe (213) is connected to the fine filter chamber (2112), and the sewage discharge pipe (214) is connected to the sewage chamber (2113). A coarse filter screen (216) located in the coarse filter chamber (2111) is provided on the partition plate (215) away from the sewage chamber (2113), and a fine filter screen (217) located in the fine filter chamber (2112) is provided between adjacent partition plates (215). A connecting hole (2153) is formed in the middle of the first partition plate (2151), and the fine filter (217) covers the connecting hole (2153). The second partition plate (2152) is rotatably connected to a drain pipe (2154) extending into the fine filter chamber (2112), and a sewage pump (218) connected to the drain pipe (214) is provided on the outer wall of the tank (21). The sewage pipe (2154) has a sewage hole (2155) that communicates with the fine filter chamber (2112), and the sewage pipe (2154) has an outlet (2157) that communicates with the sewage chamber (2113). The first partition plate (2151) is rotatably connected to a connecting ring (219) on the side near the fine filter chamber (2112). Multiple dirt collection plates (2191) are evenly spaced along the circumference on the connecting ring (219), and dirt collection grooves (2192) are formed in the dirt collection plates (2191). The sludge collection plate (2191) surrounds the drain pipe (2154), and the drain pipe (2154) is provided with a connecting pipe (2156) that connects to the sludge collection plate (2191). The connecting pipe (2156) connects the sludge collection tank (2192) and the drain pipe (2154). The sludge collection plate (2191) has collection ports (2194) formed on its opposite sides. The sludge collection plate (2191) is slidably connected to a sealing plate (2195) corresponding to the collection port (2194). The sludge collection plate (2191) is provided with an elastic driving member that drives the sealing plate (2195) to block the collection port (2194). The tank (21) is equipped with a power component that drives the drain pipe (2154) to rotate; The first partition plate (2151) is provided with a control component (9). When the sludge collection plate (2191) is flipped from a horizontal state to a vertical state, the control component (9) controls the corresponding sealing plate (2195) located above to open the collection port (2194). When the sludge collection plate (2191) flips from a vertical state to a horizontal state, the control component (9) controls the corresponding sealing plate (2195) located above to open the collection port (2194).

2. The device for deep treatment and reuse of power plant circulating cooling wastewater according to claim 1, characterized in that: The ultrafiltration system (4) also includes an ultrafiltration membrane module (41). The ultrafiltration membrane module (41) has a backwash air inlet (411) at the bottom, and a backwash water inlet (412) and a filter water inlet (413) are formed on the outer wall of the bottom of the ultrafiltration membrane module (41). The filter water inlet (413) is connected to the first security filter (3). The ultrafiltration membrane module (41) has a drain outlet (414) and a product water outlet (415) formed on the top outer wall. The drain outlet (414) is connected to a fly ash pulping system (42), and the product water outlet (415) is connected to the intermediate water tank (5). The backwashing device (43) includes a blower (431), a pneumatic valve (432), a pressure relief valve (433), and a backwashing pump (434). The outlet of the blower (431) is sequentially connected to the pneumatic valve (432), the pressure relief valve (433), and the backwash inlet (411). The inlet end of the backwash pump (434) is connected to the intermediate water tank (5), and the outlet end of the backwash pump (434) is connected to the backwash inlet (412).

3. The device for deep treatment and reuse of power plant circulating cooling wastewater according to claim 1, characterized in that: An acid dosing device (51) is provided on the intermediate water tank (5). The acid dosing device (51) includes an acid dosing tank (511) and an acid metering pump (512). The acid metering pump (512) is located between and connected to the acid dosing tank (511) and the intermediate water tank (5).

4. The device for deep treatment and reuse of power plant circulating cooling wastewater according to claim 1, characterized in that: The chemical cleaning device (8) includes a cleaning tank (81), a chemical cleaning pump (82), an ultrafiltration chemical cleaning valve (83), and a reverse osmosis cleaning valve (84). One end of the chemical cleaning pump (82) is connected to the ultrafiltration chemical cleaning valve (83) and the reverse osmosis cleaning valve (84), and the other end is connected to the cleaning tank (81). The reverse osmosis cleaning valve (84) is connected to the second security filter (6) at the end furthest from the chemical cleaning pump (82). The end of the ultrafiltration chemical cleaning valve (83) away from the chemical cleaning pump (82) is connected to the first security filter (3).

5. The device for deep treatment and reuse of power plant circulating cooling wastewater according to claim 1, characterized in that: The control component (9) includes a control ring (91), a control bar (92), and a control column (93); The control posts (93) are disposed on the sealing plate (2195) and correspond one to one. Adjacent control posts (93) are staggered. The control posts (93) slide and protrude outside the sludge collection plate (2191). The control ring (91) is located on the side of the first partition plate (2151) near the second partition plate (2152), and the control column (93) is slidably connected to the outer periphery of the control ring (91). At this time, the sealing plate (2195) blocks the collection port (2194). Multiple control strips (92) are offset and located on the outer periphery of the connecting ring (219). The control strips (92) are inclined to form a sliding surface (921). The control column (93) slides along the sliding surface (921) to the side of the control strips (92) away from the control ring (91). At this time, the sealing plate (2195) opens the collection port (2194).

6. The device for deep treatment and reuse of power plant circulating cooling wastewater according to claim 5, characterized in that: The control column (93) has an arc-shaped structure on the side away from the sealing plate (2195).

7. The device for deep treatment and reuse of power plant circulating cooling wastewater according to claim 5, characterized in that: The elastic driving component is a driving spring (2196), the sealing plate (2195) is provided with a slider (2197), and the sludge collection plate (2191) is provided with a groove (2198) for the slider (2197) to slide. The drive spring (2196) is installed in the slide groove (2198) and slides toward the control ring (91).

8. The device for deep treatment and reuse of power plant circulating cooling wastewater according to claim 1, characterized in that: The sludge collection plate (2191) is provided with cleaning bristles (2199) on the side away from the drain pipe (2154), and the cleaning bristles (2199) slide in contact with the inner peripheral sidewall of the fine filter screen (217).

9. The device for deep treatment and reuse of power plant circulating cooling wastewater according to claim 1, characterized in that: The outer wall of the sludge collection plate (2191) is inclined and symmetrically formed with a collection surface (2193) connecting the collection port (2194).

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