System for deeply treating and recycling high-low salt water in coal-fired power plant

Abstract

The utility model provides a coal-fired power plant high-low brine advanced treatment and recycling system which comprises an industrial wastewater storage pool, wherein water outlets of the industrial wastewater storage pools are connected with a main water outlet pipe through automatic valves, and the main water outlet pipe is sequentially connected with the PH adjusting tank, the reaction tank, the flocculation tank, the clarifier, the clean water pool and the final neutralization pool through a first lifting pump; the mixed bed regeneration wastewater high-salinity water is sequentially fed into a multi-medium filter for filtration, a self-cleaning filter, an ultrafiltration device and an ultrafiltration water tank through a lifting pump II and is fed into an ultraviolet sterilizer through a lifting pump III, and a water outlet of the ultraviolet sterilizer is connected with a security filter; a water outlet of the security filter is connected with the reverse osmosis device through a high-pressure pump; a fresh water outlet on the reverse osmosis device is connected with a fresh water tank and a concentrated water outlet is connected with a concentrated brine tank. According to the utility model, backwashing water and low-salt water are directly recycled to a desulfurization system after being filtered by the iron and manganese removal filter. And the mixed bed regeneration wastewater high-salinity water is discharged and treated by seawater reverse osmosis, so that recycling is achieved.

Description

Technical Field

[0001] This utility model relates to the technology of high and low saline water reuse in coal-fired power plants, and more particularly to a system for deep treatment and reuse of high and low saline water in coal-fired power plants. Background Technology

[0002] Coal-fired power plants utilize the heat energy generated from coal combustion to heat water and produce high-temperature, high-pressure steam. This steam drives the blades inside the steam turbine, cutting magnetic lines of force to generate alternating current. The water treatment system in a coal-fired power plant is extremely important; it not only ensures the normal operation and economic efficiency of the plant but is also a crucial measure for environmental protection and energy conservation and emission reduction. The water treatment system in a coal-fired power plant mainly consists of four parts: 1. Raw water treatment and boiler feedwater system: This system treats natural water or municipal wastewater to meet the unit's operational needs. Boiler feedwater replenishes the water lost during the steam-water circulation system. This water is generally demineralized water, and its water quality standard is the demineralized water standard. 1. Makeup water is crucial for the normal operation and extended service life of the boiler, as it forms the basis of the boiler's water circulation. This part consists of the water directly heated by coal combustion. 2. Condensate treatment system: An important component of the power plant's steam-water system, its main purpose is to treat the condensate after the turbine has performed its work, ensuring it meets the quality standards for boiler feedwater and guaranteeing the safe and efficient operation of the boiler system. This part is the boiler makeup water used for power generation after direct coal heating. The power plant uses a condensate polishing system for reuse. 3. Circulating water system: Circulating water reduces the unit temperature through equipment such as cooling towers, ensuring the unit operates within a safe temperature range. 4. Wastewater treatment system: Treats various types of wastewater generated during unit operation to meet environmental protection requirements.

[0003] One of the main tasks of boiler feedwater systems and condensate polishing systems is to remove ions from the water to meet demineralized water standards. Before 2008, the mainstream demineralized water process was mixed bed. Currently, boiler feedwater systems utilize reverse osmosis (RO), EDI, cation-anion bed (a subcategory of mixed beds, typically used in combination), and high-speed mixed bed for condensate polishing. Compared to reverse osmosis (RO) and EDI (continuous electro-deionization), mixed bed systems have disadvantages such as higher operating costs, more complex operation, and the need for neutralization of acidic and alkaline wastewater generated during regeneration. Their advantages include high-quality effluent, lower requirements for incoming water parameters, and the availability of high-temperature resistant high-speed mixed beds and high-temperature resistant resins. Mixed bed boiler feedwater systems are gradually being replaced, but they still have certain advantages in the final treatment of boiler feedwater. The process of primary reverse osmosis + secondary reverse osmosis + mixed bed (specifically referring to the subsequent treatment process of cation and anion beds) is irreplaceable in condensate polishing.

[0004] Coal-fired power plants widely use high-speed mixed bed technology for boiler feedwater and condensate polishing. The anion and cation beds in boiler feedwater can be replaced by two-stage reverse osmosis, and the mixed bed can be replaced by EDI. However, high-speed mixed bed technology is still used for condensate polishing and cannot be replaced by other technologies. This is mainly due to its high operating temperature (around 55℃ for water-cooled units and around 75℃ for air-cooled units) and high operating pressure, which reverse osmosis cannot operate under. It also has a large water volume (which is why condensate polishing is called high-speed mixed bed). Using reverse osmosis and EDI would require large investments (due to the large treatment scale resulting from the large water volume), hence the use of high-speed mixed bed technology, which is irreplaceable in condensate polishing for coal-fired power plants.

[0005] The working principle of a mixed bed is mainly based on ion exchange. When water passes through the mixed bed, the cation exchange resin adsorbs cations from the water, while the anion exchange resin adsorbs anions. In this way, ionic impurities in the water are adsorbed by the resin, thus purifying the water. Over time, the resin gradually becomes saturated and can no longer adsorb ions from the water. At this point, a regeneration process is required to restore the resin's adsorption capacity. During regeneration, the acid concentration is generally controlled within the range of 4-5%, and the alkali concentration within the range of 3-4%. The acid and alkali wastewater, due to the use of large amounts of acid and alkali, has a high salt content, making it difficult to reuse in coal-fired power plants.

[0006] Mixed bed osmosis boasts numerous advantages, including high desalination efficiency, strong adaptability, ease of operation, and stability. The core issue hindering its gradual replacement is stringent environmental regulations. Power plants are opting for processes that reduce wastewater treatment, and reverse osmosis also faces environmental challenges related to waste membrane treatment and concentrate treatment. Effectively addressing the comprehensive utilization of its regeneration wastewater would revitalize the technology. Furthermore, since there are currently no suitable alternatives for condensate polishing mixed bed osmosis, although its regeneration wastewater volume is small, coal-fired power plants lack effective disposal methods. Achieving the recycling and reuse of most of the water resources would improve the ecological environment to some extent.

[0007] Mixed bed regeneration wastewater is generally treated to meet discharge standards, or treated and used as makeup water for desulfurization. However, this also leads to discoloration of gypsum, a byproduct of desulfurization. Furthermore, the entry of high saline water increases the ion content of the desulfurization system, resulting in incomplete sulfur oxidation, affecting desulfurization efficiency, and causing a surge in desulfurization wastewater, among other problems.

[0008] In non-zero emission coal-fired power plants, the backwash water from the fine treatment iron and manganese removal filter, the high-salt water and low-salt water from the mixed bed regeneration wastewater are mixed and then treated with conventional industrial wastewater to meet the standards before being discharged. This can basically achieve normal treatment, but it also poses certain environmental risks and wastes a large amount of low-salt water resources (a large amount of demineralized water is required for each regeneration of the mixed bed).

[0009] In zero-emission coal-fired power plants, the backwash water from the fine treatment iron and manganese removal filter, the high-salt water from the mixed-bed regeneration wastewater, and the low-salt water are mixed and treated using conventional industrial wastewater methods. All of this is used as makeup water for desulfurization. However, the backwash water from the fine treatment iron and manganese removal filter and the high- and low-salt water from the mixed-bed regeneration contain large amounts of iron and manganese ions, causing discoloration of the desulfurization slurry. This slightly affects desulfurization efficiency and causes discoloration of the byproduct gypsum, impacting its sales, especially during the current real estate downturn. In severe cases, it may have to be given away to the buyer. If the gypsum cannot be transported out in a timely manner, it will seriously affect the operation of the power plant.

[0010] Furthermore, because the high-salinity water entered the desulfurization system directly without any treatment, the ion content of the desulfurization slurry increased significantly, leading to insufficient dissolution of calcium and sulfur dioxide. This resulted in poorer sulfur dioxide absorption by the desulfurization system, affecting desulfurization efficiency. Additionally, the oxidation of iron and manganese ions requires oxygen, leading to incomplete sulfur oxidation and impacting gypsum quality. The large influx of ions also necessitated increased wastewater discharge from the desulfurization system, resulting in a dramatic increase in desulfurization wastewater.

[0011] This invention presents a novel method for the comprehensive treatment and reuse of high- and low-salinity water from backwash water of iron and manganese removal filters and mixed-bed regeneration wastewater. It solves a series of problems that arise in desulfurization systems when wastewater is reused after desulfurization. Utility Model Content

[0012] To address the aforementioned problems, this utility model discloses a deep treatment and reuse system and method for high and low saline water in coal-fired power plants. It improves upon conventional industrial wastewater treatment systems by separating and reusing backwash water from the fine treatment iron and manganese removal filter, high-salinity wastewater from mixed-bed regeneration wastewater, and low-salinity wastewater from mixed-bed regeneration wastewater. The backwash water and low-salinity wastewater, after filtration by the iron and manganese removal filter, are directly reused in the desulfurization system. The high-salinity wastewater from the mixed-bed regeneration wastewater is treated using seawater reverse osmosis, thus achieving reuse.

[0013] A deep treatment and reuse system for high and low saline water in a coal-fired power plant includes an industrial wastewater storage tank A, an industrial wastewater storage tank B, and an industrial wastewater storage tank C. The outlets of industrial wastewater storage tanks A, B, and C are all connected to a main outlet pipe via automatic valves. The main outlet pipe is connected in sequence to a pH adjustment tank, a reaction tank, a flocculation tank, a clarifier, a clean water tank, and a final neutralization tank via a booster pump one. High saline water from mixed-bed regeneration wastewater is sequentially fed through a multi-media filter, a self-cleaning filter, an ultrafiltration device, and an ultrafiltration water tank via a booster pump two, and then fed into an ultraviolet sterilizer via a booster pump three. The outlet of the ultraviolet sterilizer is connected to a security filter. The outlet of the security filter is connected to a reverse osmosis device via a high-pressure pump. The freshwater outlet of the reverse osmosis device is connected to a freshwater tank, and the concentrated water outlet of the reverse osmosis device is connected to a concentrated brine tank.

[0014] Furthermore, the outlet of the booster pump is also equipped with a low-salinity water pipe, which is connected to the iron and manganese removal filter.

[0015] Furthermore, the outlet of the freshwater tank is connected via a booster pump four; the outlet of the concentrated brine tank is connected via a booster pump five.

[0016] Furthermore, one end of the ultrafiltration water tank is connected to the ultrafiltration device via an ultrafiltration backwash water pump; the freshwater tank is connected via...

[0017] Furthermore, industrial wastewater storage tank A, industrial wastewater storage tank B, and industrial wastewater storage tank C are used to store backwash water from the iron and manganese removal filter that should be finely treated, low-salinity mixed-bed regeneration wastewater, and high-salinity mixed-bed regeneration wastewater, respectively.

[0018] A method for deep treatment and reuse of high and low saline water from a coal-fired power plant includes the following steps:

[0019] Step 1: Modify the drainage pipelines for the backwash water from the fine treatment iron and manganese removal filter, the low-salinity wastewater from the mixed bed regeneration wastewater, and the high-salinity wastewater from the mixed bed regeneration wastewater. Send the backwash water from the fine treatment iron and manganese removal filter to industrial wastewater storage tank A, the low-salinity wastewater from the mixed bed regeneration wastewater to industrial wastewater storage tank B, and the high-salinity wastewater from the mixed bed regeneration wastewater to industrial wastewater storage tank C for storage. Appropriate anti-corrosion measures must be taken for the tank bodies and equipment of the industrial wastewater storage tanks according to the water quality conditions to achieve separate recycling. Automatic valves connected to the discharge pipes are installed at the outlets of industrial wastewater storage tanks A, B, and C, based on the characteristics of the three water qualities.

[0020] Step 2: Connect the discharge pipe to the first booster pump, and connect the discharge pipe of the first booster pump to the pH adjustment tank; connect the discharge pipe of the pH adjustment tank to the reaction tank, and connect the discharge pipe of the reaction tank to the flocculation tank; connect the flocculation tank to the clarifier, and connect the outlet of the clarifier to the final neutralization tank and the purified water tank; the final neutralization tank and the purified water tank adopt a rotary overflow design; the recommended volume ratio between the purified water tank and the final neutralization tank is 4:1.

[0021] Step 3: The water after the backwash water of the fine treatment iron and manganese removal filter and the low-salinity water of the mixed bed regeneration wastewater are collectively referred to as low-salinity water. After passing through the clean water tank, it enters the iron and manganese removal filter for a second time to remove the iron and manganese that affect the operation of the desulfurization system, and is finally reused in the desulfurization system.

[0022] Step 4: The high saline wastewater from the mixed bed regeneration is sequentially fed into a multi-media filter, a self-cleaning filter, an ultrafiltration device, and an ultrafiltration water tank via a second booster pump. It is then fed into an ultraviolet sterilizer via a third booster pump, and finally into a security filter via the ultraviolet sterilizer.

[0023] Step 5: The security filter is pumped into the reverse osmosis unit for treatment via a high-pressure pump. The resulting fresh water is sent to the fresh water tank, and the resulting concentrated water is sent to the concentrated brine tank. The water in the fresh water tank is transported to the boiler feedwater system for reuse via booster pump four. The water in the concentrated brine tank is transported to the desulfurization system for makeup water via booster pump five.

[0024] Furthermore, different dosing methods and residence times are used in step 1; the residence time is changed by adjusting the manual valve of the booster pump or by using a frequency converter to change the flow rate of the treated water.

[0025] Furthermore, to ensure the operation of reverse osmosis, the conductivity of the high-salinity wastewater from the mixed bed regeneration is controlled at 5 mS / cm.

[0026] Furthermore, step 5 ultimately employs reverse osmosis for treatment. The reverse osmosis must use seawater reverse osmosis, and the recovery rate is generally set at 60%.

[0027] Furthermore, the ultrafiltration water tank is connected to the ultrafiltration device via an ultrafiltration backwash water pump, and the freshwater tank is connected to the reverse osmosis device via a reverse osmosis flushing pump to achieve backwashing. Since the backwashing of the fine treatment iron and manganese removal filter and the regeneration of the mixed bed are both relatively long, generally more than 45 days, the industrial wastewater treatment equipment needs to be emptied each time the backwashing of the treated water filter and the regeneration of the mixed bed are switched. The pH adjustment tank, reaction tank, flocculation tank, clarifier, clean water tank and final neutralization tank need to be emptied. The final neutralization tank is not equipped with a submersible lift pump. A temporary submersible lift pump is used for cleaning during its periodic treatment. The emptying method is that the pH adjustment tank, reaction tank, flocculation tank and clarifier are all equipped with bottom drain valves. The bottom sediment is first discharged to the sludge pit. The sludge is then transported to the sludge treatment room for centralized dewatering, and the upper clean water is discharged back to the original industrial wastewater storage tank.

[0028] The beneficial effects of this utility model are:

[0029] 1. It achieves deep treatment of backwash water from iron and manganese removal filters, high-salinity wastewater from mixed bed regeneration, and low-salinity wastewater from mixed bed regeneration, and also recycles water resources.

[0030] 2. It solves a series of problems caused by iron and manganese in the backwash water of the fine treatment iron and manganese removal filter and the fine treatment mixed bed reclaimed water being reused in the desulfurization system.

[0031] 3. Install a seawater reverse osmosis system to deeply treat and reuse the high-salinity wastewater from the mixed-bed regeneration process;

[0032] 4. The final neutralization tank and the purified water tank adopt a rotary overflow design to improve the quality of the produced water; the final neutralization tank is cleaned regularly using a submersible lift pump.

[0033] 5. Reverse osmosis must use seawater reverse osmosis, with a recovery rate generally set at 60%, not the conventional 90%. Conventional reverse osmosis typically achieves 75% or higher, sometimes reaching 90%, because it treats water with low ion content, thus enabling the recovery of chlorine. Seawater reverse osmosis is designed for high-salinity seawater; due to the high ion content, even with special design, it can only achieve 35%-55%.

[0034] 6. This utility model uses seawater reverse osmosis for treatment. Because its high-salinity water is the same as the mixed-bed regenerated high-salinity water, and because of its high ion content, it carries away some of the mixed low-salinity water, achieving a recovery rate of 50%-70%, which is higher than when treating seawater.

[0035] 7. Fresh water can be reused in the boiler feedwater system, and concentrated brine can be used to make up for the desulfurization system. Attached Figure Description

[0036] Figure 1 System diagram of this utility model. Detailed Implementation

[0037] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. It should be noted that the terms "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the accompanying drawings, and the terms "inner" and "outer" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0038] like Figure 1 As shown in this embodiment, a system for deep treatment and reuse of high and low saline water in a coal-fired power plant includes an industrial wastewater storage tank A4, an industrial wastewater storage tank B5, and an industrial wastewater storage tank C6. The outlets of industrial wastewater storage tanks A4, B5, and C6 are all connected to a main outlet pipe via automatic valves. The main outlet pipe is connected in sequence to a pH adjustment tank 9, a reaction tank 10, a flocculation tank 11, a clarifier 12, a purified water tank 14, and a final neutralization tank via a booster pump. The high-salinity wastewater from the mixed-bed regeneration process is sequentially fed through a multi-media filter 18, a self-cleaning filter 20, an ultrafiltration unit 21, and an ultrafiltration water tank 22 via a second booster pump. It is then fed into an ultraviolet sterilizer 23 via a third booster pump. The outlet of the ultraviolet sterilizer 23 is connected to a security filter 24. The outlet of the security filter 24 is connected to a reverse osmosis unit 26 via a high-pressure pump 25. The freshwater outlet of the reverse osmosis unit 26 is connected to a freshwater tank 27, and the concentrated water outlet of the reverse osmosis unit 26 is connected to a concentrated brine tank 29.

[0039] The outlet of the booster pump 2 is also equipped with a low-salinity water pipe, which is connected to the iron and manganese removal filter 17.

[0040] The outlet of the freshwater tank 27 is connected via a booster pump four; the outlet of the concentrated brine tank 29 is connected via a booster pump five. One end of the ultrafiltration tank is connected to the ultrafiltration device via an ultrafiltration backwash water pump.

[0041] Furthermore, industrial wastewater storage tank A, industrial wastewater storage tank B, and industrial wastewater storage tank C are used to store backwash water from the iron and manganese removal filter that should be finely treated, low-salinity mixed-bed regeneration wastewater, and high-salinity mixed-bed regeneration wastewater, respectively.

[0042] like Figure 1 The equipment usage table is as follows:

[0043] Serial Number name Serial Number name 1 Fine treatment iron and manganese removal filter backwash water 16 High saline 2 Mixed bed regeneration low saline solution 17 Iron and manganese removal filter 3 Mixed bed regeneration high saline solution 18 Water reused in the desulfurization system makeup water 4 Industrial wastewater storage tank A 19 Multi-media filter 5 Industrial wastewater storage tank B 20 Self-cleaning filter 6 Industrial wastewater storage tank C 21 Ultrafiltration device 7 atmosphere 21.1 Ultrafiltration backwash water pump 8 Roots blower 22 Ultrafiltration water tank 9 pH adjustment tank 23 UV sterilizer 9.1 Add acid 24 Security Filter 9.2 Add alkali 25 High pressure pump 10 reaction tank 26 Reverse osmosis unit 10.1 Add flocculant 26.1 Reverse osmosis flushing pump 11 flocculation tank 26.2 water production 11.1 Add coagulant 26.3 Concentrated water 12 Clarifier 27 Freshwater tank 13 Final neutralization pool 28 reuse 14 Clean pool 29 concentrated brine pool 15 low saline 30 Outbound processing Note 1 mud removal

[0044] This embodiment describes a deep treatment method for high and low salinity water in a coal-fired power plant.

[0045] Step 1: Modify the drainage pipelines for the backwash water 1 from the fine treatment iron and manganese removal filter, the low-salinity wastewater 2 from the mixed bed regeneration wastewater, and the high-salinity wastewater 3 from the mixed bed regeneration wastewater. Send the backwash water 1 from the fine treatment iron and manganese removal filter to industrial wastewater storage tank A4, the low-salinity wastewater 2 from the mixed bed regeneration wastewater to industrial wastewater storage tank B5, and the high-salinity wastewater 3 from the mixed bed regeneration wastewater to industrial wastewater storage tank C6 for storage. Appropriate anti-corrosion measures must be taken for the tank bodies and equipment of the industrial wastewater storage tanks according to the water quality conditions to achieve separate recycling. Based on the characteristics of the three water qualities, automatic valves are installed at the outlets of industrial wastewater storage tanks A4, B5, and C6, all connected to the discharge pipes. To ensure the operation of reverse osmosis, the conductivity of the high-salinity wastewater from the mixed bed regeneration wastewater is controlled at 5 mS / cm.

[0046] Step 2: Connect the discharge pipe to lift pump one; the discharge pipe of lift pump one is connected to pH adjustment tank 9; the discharge pipe of pH adjustment tank 9 is connected to reaction tank 10; the discharge pipe of reaction tank 10 is connected to flocculation tank 11; flocculation tank 11 is connected to clarifier 12; the outlet of clarifier 12 is connected to final neutralization tank 13 and purified water tank 14; the final neutralization tank 13 and purified water tank 14 adopt a rotary overflow design; the recommended volume ratio between purified water tank 14 and final neutralization tank 13 is 4:1; pH adjustment is performed on pH adjustment tank 9 by adding acid 9.1 and alkali 9.2.

[0047] In step 1, different dosing methods and residence times are used; the residence time is adjusted by changing the manual valve of the booster pump or by changing the frequency of the booster pump to change the flow rate of the treated water.

[0048] Step 3: The water after the backwash water of the fine treatment iron and manganese removal filter and the low saline water of the mixed bed regeneration wastewater are collectively referred to as low saline water 15. After passing through the clean water tank 14, it enters the iron and manganese removal filter 17 through the second lift pump to remove iron and manganese that affect the operation of the desulfurization system for the second time, and is finally reused in the desulfurization system 18.

[0049] Step 4: The high salinity wastewater 16 from the mixed bed regeneration is sequentially fed into the multi-media filter 19, the self-cleaning filter 20, the ultrafiltration device 21 and the ultrafiltration water tank 22 by the second booster pump, and then into the ultraviolet sterilizer 23 by the third booster pump, and then into the security filter 24 for filtration through the ultraviolet sterilizer 23.

[0050] Step 5: The security filter 24 is sent to the reverse osmosis unit 26 for treatment via the high-pressure pump 25. The resulting fresh water 26.2 is sent to the fresh water tank 27, and the resulting concentrated water 26.3 is sent to the concentrated brine tank 29. The water in the fresh water tank 27 is transported to the boiler feedwater system for reuse via the booster pump 4. The water in the concentrated brine tank 29 is transported to the external treatment 30 via the booster pump 5 for desulfurization system replenishment.

[0051] The final treatment process uses reverse osmosis, which requires seawater and typically has a recovery rate of 60%.

[0052] The ultrafiltration water tank 22 is connected to the ultrafiltration device via the ultrafiltration backwash water pump 21.1, and the freshwater tank 27 is connected to the reverse osmosis device 26 via the reverse osmosis flushing pump 26.1 to achieve backwashing. Since the backwashing of the fine treatment iron and manganese removal filter and the regeneration of the mixed bed are both relatively long, generally more than 45 days, the industrial wastewater treatment equipment needs to be emptied each time the treatment water quality filter backwashing and mixed bed regeneration water are switched. The pH adjustment tank 9, reaction tank 10, flocculation tank 11, clarifier 12, clean water tank 14, and final neutralization tank 13 are emptied. The final neutralization tank 13 is not equipped with a submersible lift pump. A temporary submersible lift pump is used for cleaning during its periodic treatment. The emptying method is that the pH adjustment tank, reaction tank, flocculation tank, and clarifier are all equipped with bottom drain valves. The bottom sediment is first discharged to the sludge pit. The sludge is then transported to the sludge treatment room for centralized dewatering, and the upper clean water is discharged back to the original industrial wastewater storage tank.

[0053] This embodiment can achieve the separate recovery of backwash water from the iron and manganese removal filter, high-salinity wastewater from mixed bed regeneration wastewater, and low-salinity wastewater from mixed bed regeneration wastewater; different dosages are set according to different water qualities to achieve better treatment results; before the low-salinity wastewater is reused in the desulfurization system, an iron and manganese removal filter is installed to reduce the entry of iron and manganese into the desulfurization system and improve the desulfurization operation effect.

[0054] The technical means disclosed in this utility model are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.

Claims

1. A system for advanced treatment and reuse of high and low salinity water from coal-fired power plants, characterized by: The system includes industrial wastewater storage tank A, industrial wastewater storage tank B, and industrial wastewater storage tank C. The outlets of industrial wastewater storage tanks A, B, and C are all connected to a main outlet pipe via automatic valves. The main outlet pipe is connected in sequence to a pH adjustment tank, reaction tank, flocculation tank, clarifier, clean water tank, and final neutralization tank via a booster pump 1. High-salinity mixed-bed regeneration wastewater is sequentially fed through a multi-media filter, a self-cleaning filter, an ultrafiltration device, and an ultrafiltration water tank via a booster pump 2, and then fed into an ultraviolet sterilizer via a booster pump 3. The outlet of the ultraviolet sterilizer is connected to a security filter. The outlet of the security filter is connected to the reverse osmosis unit via a high-pressure pump; the freshwater outlet of the reverse osmosis unit is connected to the freshwater tank.

2. The system for advanced treatment and reuse of high and low salinity water from a coal-fired power plant of claim 1, wherein: The concentrated water outlet of the reverse osmosis unit is connected to the concentrated brine tank.

3. The system for deep treatment and reuse of high and low saline water in a coal-fired power plant according to claim 1, characterized in that: The outlet of the booster pump is also equipped with a low-salinity water pipe, which is connected to the iron and manganese removal filter.

4. A system for deep treatment and reuse of high and low saline water in a coal-fired power plant according to claim 1, characterized in that: The outlet of the freshwater tank is connected to a booster pump.

5. A system for deep treatment and reuse of high and low saline water in a coal-fired power plant according to claim 2, characterized in that: The outlet of the concentrated brine tank is connected via a booster pump.

6. A system for deep treatment and reuse of high and low saline water in a coal-fired power plant according to claim 1, characterized in that: One end of the ultrafiltration water tank is connected to the ultrafiltration device via an ultrafiltration backwash water pump.

7. The system for advanced treatment and reuse of high and low salinity water from a coal-fired power plant of claim 1, wherein: The freshwater tank is connected to the reverse osmosis unit via a reverse osmosis flushing pump.

8. The system for advanced treatment and reuse of high and low salinity water from a coal-fired power plant of claim 1, wherein: Industrial wastewater storage tank A, industrial wastewater storage tank B, and industrial wastewater storage tank C are used to store backwash water from the iron and manganese removal filter, low-salinity mixed-bed regeneration wastewater, and high-salinity mixed-bed regeneration wastewater, respectively.

9. The system for advanced treatment and reuse of high and low salinity water from a coal-fired power plant of claim 1, wherein: The final neutralization tank and the purification tank adopt a rotary overflow design.

10. The system for advanced treatment and reuse of high and low salinity water from a coal-fired power plant of claim 6, wherein: The recommended volume ratio of the clean water tank to the final neutralization tank is 4:1.

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