Treatment system and method for infinitely improving concentration multiple of circulating cooling water

Abstract

The invention relates to the technical field of water treatment, in particular to a treatment system and method for infinitely increasing the concentration multiple of circulating cooling water. Comprising an indirect cooling part, a split-flow treatment part and a sludge treatment part, the whole system does not discharge water, the concentration multiple of the system is infinitely improved, and finally, part of water and part of salt are taken away through sludge discharge of the system, so that salt balance is formed. By adopting a series of measures, the problems of corrosion, scaling, microbial algae and the like of a spray water system are solved, the system can be stably and circularly used, water is saved, strong brine is consumed, and the strong brine treatment problem is solved. The method is close to circular economy, resource utilization of the strong brine is achieved, water is saved, pollution is reduced, and economic and social benefits are remarkable.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, in particular to a treatment system and method for infinitely improving the concentration multiple of circulating cooling water. Background Art

[0002] Increasing the concentration ratio of circulating cooling water is beneficial to saving new water, but with the increase in concentration ratio, the salt, hardness, chloride ions, etc. in the water are enriched, which will cause corrosion, scaling, sludge deposition, and reduced heat exchange efficiency to heat exchange equipment, pipelines and other facilities; microorganisms, bacteria and algae breed biological slime, which is easy to cause microbial corrosion and block pipelines, heat exchange equipment, etc. Water treatment membrane method produces concentrated brine, and the disposal of concentrated brine has always been a problem.

[0003] Currently, many enterprises send concentrated brine to users with low water quality requirements. For example, the metallurgical industry sends it to blast furnace slag flushing. Although some of the concentrated brine can be consumed, the high salt content affects the quality of blast furnace slag, making it difficult to reuse as building materials. Chloride ions are highly corrosive to slag flushing equipment, and there are also problems such as slag compaction due to scaling. Some enterprises also deeply treat the concentrated brine for salt separation and crystallization, ultimately producing by-products such as sodium chloride and sodium sulfate, but the product utilization rate is low and sales are difficult. At the same time, some hazardous waste is generated and needs to be treated. The investment and operating costs for salt separation are extremely high, which enterprises cannot afford. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a processing system and method for infinitely improving the concentration multiples of circulating cooling water, which can infinitely improve the concentration multiples of circulating cooling water, which is beneficial to saving new water and consuming concentrated brine, making the disposal of concentrated brine no longer a problem, saving a lot of investment and operating costs.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A treatment system for infinitely improving the concentration multiple of circulating cooling water, comprising an indirect cooling part, a diversion treatment part and a sludge treatment part; the indirect cooling part comprises a cooling water pool, a user end and a cooler connected by pipelines, the cooler comprises a cooler coil and a cooler water collecting pan, and the cooler water collecting pan is connected to a spray water replenishment device; the diversion treatment part comprises a chiller, an electrochemical descaling device, a sedimentation device, an intermediate water tank, a filter and a filter backwashing regulating tank, and the chiller, the cooler water collecting pan, the electrochemical descaling device, the sedimentation device, the intermediate water tank, the filter and the filter backwashing regulating tank are connected by pipeline; the sludge treatment part comprises a dosing device, a sludge dehydration device, a sludge regulating tank, a sludge concentrating device, and a sedimentation sludge discharge tank, and the dosing device, the sludge dehydration device, the sludge regulating tank, the sludge concentrating device, and the sedimentation sludge discharge tank are connected by pipeline to the sedimentation device.

[0007] Furthermore, the cooler is a corrosion-resistant closed cooler. The part in contact with the concentrated brine is made of corrosion-resistant materials, including but not limited to duplex steel, steel-based hot-dip aluminum or titanium materials.

[0008] Furthermore, the sedimentation device is a high-density sedimentation tank.

[0009] Furthermore, the filter is a sand filter or a fiber ball filter.

[0010] Furthermore, it also includes a PH regulating device, which is connected to the cooler water collecting tray and the spray water replenishing device pipeline.

[0011] Furthermore, it also includes a cooling water supply pump and a cooler spray pump; the cooling water supply pump is installed on the pipeline connecting the cooling water tank and the user end, and the cooler spray pump is installed on the pipeline connecting the cooler water collection tray and the electrochemical descaling device; it also includes a filter water supply pump and a filter backwash drainage pump; the filter water supply pump is installed on the pipeline connecting the filter and the intermediate water tank, and the filter backwash drainage pump is installed on the pipeline connecting the filter backwash regulating tank and the electrochemical descaling device; it also includes a mud and water lifting pump and a sludge lifting pump; the mud and water lifting pump is installed on the pipeline connecting the sedimentation and sludge discharge tank and the sludge concentration device, and the sludge lifting pump is installed on the pipeline connecting the sludge dewatering device and the sludge regulating tank.

[0012] A method for infinitely increasing the concentration multiple of circulating cooling water is implemented based on the above system and specifically includes the following steps:

[0013] 1. The water in the cooling water pool is used by the user end. After use, the water temperature rises and is sent to the cooler for cooling, and then sent to the cooling water pool for recycling;

[0014] 2. The water supply of the spray water supply device is concentrated brine, part of which is used for cooling the cooler coil, and part of which is diverted and sent to the electrochemical descaling device;

[0015] 3. The electrochemical descaling device precipitates the hardness in the water in the form of soft scale, and then sends it to the sedimentation device for sedimentation treatment. After treatment, it enters the intermediate water tank and then is sent to the filter to further remove suspended matter;

[0016] 4. The filter backwash drainage enters the filter backwash regulating tank for water volume adjustment and then is sent to the sedimentation device for treatment;

[0017] 5. The water from the filter enters the chiller for cooling, and then returns to the water collection tray of the cooler for recycling;

[0018] 6. The pH adjustment device adds acid to the spray water system;

[0019] 7. The sedimentation device discharges the sludge into the sedimentation sludge tank, and the sludge is sent to the sludge thickening device to further thicken the sludge;

[0020] 8. The sludge thickening device discharges sludge into the sludge regulating tank, and then sends the sludge to the sludge dewatering device for dehydration. The dry sludge is transported out for treatment, and the supernatant and the effluent from the sludge thickening device are returned to the sedimentation tank for treatment and then recycled.

[0021] 9. The dosing device adds flocculating agent to the sludge dewatering device.

[0022] Furthermore, in steps 1) and 2), the circulating cooling water is cooled indirectly, the circulating cooling water in the cooler tube coil for the user end is soft water or new water, and the spray water for cooling outside the cooler tube coil is concentrated brine, and the two are set separately.

[0023] Furthermore, the concentration multiple of the concentrated brine is continuously increased, and the brine is infinitely concentrated to reach a conductivity of 300,000 us / cm to form a salt balance.

[0024] Furthermore, 5% to 10% by mass of the replenishing water of the spray replenishing device is taken for descaling, sedimentation, filtration, and refrigeration treatment, and then sent back to the spray replenishing device after treatment.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. Add concentrated brine to the circulating water system as the spray water for the cooler, so that the concentration of the spray water can be infinitely increased. It is only necessary to study corrosion, scaling, sludge precipitation and other problems at the closed cooler end of the circulating water treatment to avoid such problems at the user end and reduce the scope of risk. Part of the spray water is diverted for treatment to remove the hardness and suspended matter of the spray water system, and the scaling is controlled by adjusting the pH; the conductivity of the spray water is controlled at about 300,000 us / cm to prevent the growth of microorganisms and the generation of slime, as well as microbial corrosion of equipment; water-containing sludge is finally produced through sludge treatment, and the sludge discharge takes away part of the salt to form a salt balance.

[0027] The whole system has no external drainage, and the system concentration multiple is infinitely improved. Finally, part of the water is taken out through the system mud discharge, and part of the salt is taken away to form a salt balance. By taking a series of measures, the corrosion, scaling, microbial algae and other problems of the spray water system are solved, so that the system can be stably recycled, saving water while consuming concentrated brine, solving the problem of concentrated brine treatment. The present invention is closely linked to the circular economy, realizes the resource utilization of concentrated brine, saves water and reduces pollution, and has significant economic and social benefits.

[0028] 2. The present invention adopts a corrosion-resistant closed cooler, which can prevent corrosion caused by chloride ions and the like. When the concentration of chloride ions reaches a certain level, the corrosion efficiency decreases, which can effectively reduce corrosion.

[0029] 3. The descaling of the present invention adopts electrochemical descaling. Under the action of electric current, the spray water treated by shunting forms an alkaline environment near the cathode, the pH is increased, and hydroxide ions and carbonate ions are enriched. When calcium and magnesium ions pass through this area, precipitates such as calcium carbonate and magnesium hydroxide will be generated. These precipitates will be adsorbed on the cathode plate or suspended in the water. Under the action of the electric field, they can interfere with the crystallization process of CaCO3, causing the lattice to be distorted into irregular aragonite structure crystals. This is the lattice distortion effect. Lattice distortion turns the scale into amorphous soft scale. The crystals of this scale are not suitable for growing. There are a large number of gaps in the scale layer, and the adhesion between them is poor. It is easy to be washed away in the water flow and can be discharged with the sewage. This inhibits the formation of dense hard scale (calcite structure). BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure and process principle of the indirect cooling part of the present invention.

[0031] Figure 2 It is a schematic diagram of the structure and process principle of the diversion processing part of the present invention.

[0032] Figure 3 It is a schematic diagram of the structure and process principle of the sludge treatment part of the present invention.

[0033] In the figure: 1-cooling water tank 2-cooling water supply pump 3-user end 4-enclosed cooler 5-cooler coil 6-cooler water collection tray 7-cooler spray pump 8-spray water replenishment device 9-electrochemical descaling device 10-precipitation device 11-intermediate water tank 12-filter water supply pump 13-filter 14-chiller 15-filter backwash regulating tank 16-filter backwash drainage pump 17-PH regulating device 18-precipitation and sludge discharge tank 19-sludge water lifting pump 20-sludge concentration device 21-sludge regulating tank 22-sludge lifting pump 23-sludge dewatering device 24-dosing device DETAILED DESCRIPTION

[0034] The present invention discloses a treatment system and method for infinitely improving the concentration multiple of circulating cooling water. Those skilled in the art can refer to the content of this article and appropriately improve the process parameters to achieve it. It is particularly important to point out that all similar substitutions and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention. The method and application of the present invention have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the methods and applications described herein without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0035] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0036] A treatment system for infinitely increasing the concentration multiple of circulating cooling water, comprising an indirect cooling part, a diversion treatment part and a sludge treatment part.

[0037] like Figure 1 As shown, the indirect cooling part includes a cooling water pool 1, a cooling water supply pump 2, a user end 3 and a closed cooler 4. The closed cooler 4 is a corrosion-resistant closed cooler, and the part in contact with concentrated brine is made of corrosion-resistant materials, including but not limited to duplex steel, steel-based hot-dip aluminum or titanium materials, mainly to prevent corrosion such as chloride ions. At the same time, other equipment materials in contact with the spray water need to be made of corrosion-resistant materials or be treated with anti-corrosion. When the concentration of chloride ions reaches a certain height, the corrosion efficiency decreases, which can effectively reduce corrosion. The closed cooler 4 includes a cooler coil 5 and a cooler water collection tray 6.

[0038] The outlet of the cooling water pool 1 is connected to the inlet pipe of the cooling water supply pump 2, the outlet of the cooling water supply pump 2 is connected to the inlet pipe of the user end 3, the outlet of the user end 3 is connected to the pipe of the cooler coil 5, and the cooler coil 5 is connected to the inlet pipe of the cooling water pool 1. The spray water replenishing device 8 is connected to the cooler water collecting pan 6, the outlet of the cooler water collecting pan 6 is connected to the inlet pipe of the cooler spray pump 7, and the outlet of the cooler spray pump 7 is respectively connected to the cooler coil 5 and the electrochemical descaling device 9 through pipes.

[0039] like Figure 2 As shown, the diversion treatment part includes a chiller 14, an electrochemical descaling device 9, a sedimentation device 10, an intermediate water tank 11, a filter water supply pump 12, a filter 13, a filter backwashing regulating tank 15, a filter backwashing drainage pump 16 and a pH regulating device 17. The sedimentation device 10 is a high-density sedimentation tank. The filter 13 is a sand filter or a fiber ball filter.

[0040] The outlet of the filter 13 is connected to the inlet pipe of the chiller 14, and the outlet of the chiller 14 is connected to the pipe of the cooler water collecting pan 6. The outlet of the filter 13 is connected to the inlet pipe of the filter backwash regulating tank 15, and the outlet of the filter backwash regulating tank 15 is connected to the inlet pipe of the filter backwash drainage pump 16, and the outlet of the filter backwash drainage pump 16 is respectively connected to the inlet pipes of the electrochemical descaling device 9 and the sedimentation device 10, and the outlet of the sedimentation device 10 is connected to the inlet pipe of the intermediate water tank 11, and the outlet of the intermediate water tank 11 is connected to the inlet pipe of the filter water supply pump 12, and the outlet of the filter water supply pump 12 is connected to the inlet pipe of the filter 13. The PH adjustment device 17 is connected to the cooler water collecting pan 6 and the spray water replenishment device 8 pipes.

[0041] like Figure 3 As shown, the sludge treatment part includes a dosing device 24, a sludge dewatering device 23, a sludge lifting pump 22, a sludge regulating tank 21, a sludge concentrating device 20, a mud and water lifting pump 19, and a sedimentation and sludge discharge tank 18.

[0042] The dosing device 24 is connected to the pipeline of the sludge dewatering device 23, the outlet of the sludge dewatering device 23 is connected to the inlet pipeline of the sedimentation device 10, the outlet of the sedimentation device 10 is connected to the inlet pipeline of the sedimentation sludge discharge tank 18, the outlet of the sedimentation sludge discharge tank 18 is connected to the inlet pipeline of the mud and water lifting pump 19, the outlet of the mud and water lifting pump 19 is connected to the inlet pipeline of the sludge thickening device 20, the outlet of the sludge thickening device 20 is connected to the inlet pipeline of the sludge regulating tank 21, the outlet of the sludge regulating tank 21 is connected to the inlet pipeline of the sludge lifting pump 22, and the outlet of the sludge lifting pump 22 is connected to the inlet pipeline of the sludge dewatering device 23.

[0043] The circulating cooling water system of the present invention adopts an indirect cooling method, and a corrosion-resistant closed cooler is used for cooling; the closed cooler sprays cooling water (refrigerant water) and uses concentrated salt water or other water types to replenish the water, so that the concentration multiple of the spray water is continuously improved (infinite concentration), and finally a salt balance is formed after the conductivity reaches about 300,000 us / cm; the hardness and suspended matter that are continuously concentrated in the spray water system are removed by diversion treatment; the water temperature of part of the spray water is reduced by the chiller 14 to reduce the problem of high cooling water temperature in summer; the scale and sludge with a high water content generated by the spray water diversion treatment are concentrated and dehydrated, and the supernatant generated is returned to the spray water system. The dehydrated sludge contains part of the water and takes away part of the salt in the system, so that the spray water system forms a salt balance.

[0044] The cooler coil 5 contains circulating cooling water for the user end, and soft water or new water with better water quality can be used as water replenishment. The spray water outside the cooler coil 5 is concentrated brine or other water sources as water replenishment. The spray water system takes away part of the water through evaporation, splashing, and discharge of scale-containing sludge, and does not discharge sewage or other discharges, so that the spray water is continuously concentrated, and finally a balance of water volume and salt is formed. Due to the continuous increase in the concentration multiple of the spray water system, scaling will become more and more serious, and the hardness and suspended solids are removed by diversion treatment. Because the spray water system is maintained in an extremely high salt environment, it is difficult for microorganisms and algae to survive, and there is no need to add bactericidal and algaecidal agents.

[0045] Indirect cooling is to use concentrated brine as spray water, which is separated from the cooling water in the cooler coil 5 to prevent the spray water from corroding the user-side heat exchange equipment. Diversion treatment is to take 5-10% of the spray water for descaling, sedimentation, filtration, and refrigeration treatment (as needed), and then return it to the spray water system after treatment to prevent scaling in the spray water, reduce the content of suspended matter, and reduce the temperature of the spray water.

[0046] The descaling adopts electrochemical descaling. Under the action of electric current, the spray water treated by diversion forms an alkaline environment near the cathode, the pH increases, and hydroxide ions and carbonate ions are enriched. When calcium and magnesium ions pass through this area, precipitates such as calcium carbonate and magnesium hydroxide will be generated. These precipitates will be adsorbed on the cathode plate or suspended in the water. Under the action of the electric field, they can interfere with the crystallization process of CaCO3, causing the lattice to be distorted and become irregular aragonite structure crystals. This is the lattice distortion effect. Lattice distortion turns the scale into amorphous soft scale. The crystals of this scale are not suitable for growing. There are a lot of gaps in the scale layer, and the adhesion between each other is poor. It is easy to be washed away in the water flow and can be discharged with the sewage. This inhibits the formation of dense hard scale (calcite structure).

[0047] Sedimentation can be carried out by using sedimentation facilities such as high-density sedimentation tanks, and the effluent enters the filtration process, and the sedimentation sludge enters the sludge treatment system for treatment. Filters such as sand and gravel or fiber balls can be used for filtration, and the effluent enters the next level of treatment. The backwash drainage is collected and evenly sent to the front-end sedimentation facility. The refrigeration treatment uses a chiller 14, and the treated water temperature is set according to the summer water temperature and the user's required water temperature. Sludge treatment is to collect the precipitated sludge and evenly send it to the sludge concentration device 20. After the sludge is concentrated, it is sent to the sludge dehydration device 23 for dehydration. The sludge concentration effluent and the supernatant produced by the sludge dehydration are returned to the sedimentation device 10 for diversion treatment for treatment and then returned to the spray water system for use.

[0048] A method for infinitely increasing the concentration multiple of circulating cooling water is implemented based on the above system and specifically includes the following steps:

[0049] 1. The circulating cooling water supply pump 2 takes water from the cooling water pool 1 for use by the user end 3. After use, the water temperature rises and returns to the closed cooler 4 for cooling before entering the cooling water pool 1 for circulation. In this process, the circulating cooling water does not come into contact with the outside, and the water quality can be well maintained.

[0050] 2. The spray water replenishment 8 in the closed cooler 4 is replenished with concentrated brine according to the liquid level of the cooler water collecting tray 6, and is lifted by the cooler spray pump 7. A part of it is used for cooling the cooler coil 5, and a part of it is diverted and sent to the electrochemical descaling device 9 for further treatment.

[0051] 3. After the electrochemical descaling device 9 precipitates the hardness in the water in the form of soft scale, it enters the sedimentation device 10 for sedimentation treatment, and after treatment, it enters the intermediate water tank 11, and then is pressurized by the filter water supply pump 12 and sent to the filter 13 for further removal of suspended matter.

[0052] 4. The backwash drainage of the filter 13 enters the filter backwash regulating tank 15 for water volume adjustment, and is evenly sent to the sedimentation device 10 for treatment through the filter backwash drainage pump 16.

[0053] 5. The water from the filter 13 enters the chiller 14 for cooling, and then returns to the cooler water collection tray 6 for recycling.

[0054] 6. The pH adjustment device 17 adds acid to the spray water system to place the spray water system in an acidic environment, making it difficult for the water hardness to form scale.

[0055] 7. The sedimentation device 10 discharges the sludge into the sedimentation and sludge discharge tank 18, and is sent to the sludge concentrating device 20 through the mud and water lifting pump 19 to further concentrate the sludge.

[0056] 8. The sludge thickening device 20 discharges sludge into the sludge regulating tank 21, and is sent to the sludge dewatering device 23 for dehydration through the sludge lifting pump 22. The dry sludge is transported out for treatment, and the supernatant and the effluent from the sludge thickening device are returned to the sedimentation tank for treatment and then recycled.

[0057] 9. The dosing device 24 adds flocculating agents into the sludge treatment system.

[0058] The whole system has no external drainage, and the system concentration multiple is infinitely improved. Finally, part of the water is taken out through the system mud discharge, and part of the salt is taken away to form a salt balance. By taking a series of measures, the corrosion, scaling, microbial algae and other problems of the spray water system are solved, so that the system can be stably recycled, saving water while consuming concentrated brine, solving the problem of concentrated brine treatment. The present invention is closely linked to the circular economy, realizes the resource utilization of concentrated brine, saves water and reduces pollution, and has significant economic and social benefits.

[0059] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A treatment system for infinitely increasing the concentration multiple of circulating cooling water, characterized in that: It includes indirect cooling part, diversion treatment part and sludge treatment part; The indirect cooling part includes a cooling water pool, a user end and a cooler connected by pipelines, the cooler includes a cooler coil and a cooler water collecting pan, and the cooler water collecting pan is connected to a spray water replenishing device; The split flow treatment part includes a chiller, an electrochemical descaling device, a sedimentation device, an intermediate water tank, a filter and a filter backwashing regulating tank, and the chiller, a cooler water collecting tray, an electrochemical descaling device, a sedimentation device, an intermediate water tank, a filter and a filter backwashing regulating tank are connected by pipelines; The sludge treatment part comprises a dosing device, a sludge dewatering device, a sludge regulating tank, a sludge concentrating device, and a sedimentation and sludge discharge tank. The dosing device, the sludge dewatering device, the sludge regulating tank, the sludge concentrating device, and the sedimentation and sludge discharge tank are connected with a sedimentation device pipeline.

2. A treatment system for infinitely improving the concentration multiple of circulating cooling water according to claim 1, characterized in that: The cooler is a corrosion-resistant closed cooler, and the part in contact with concentrated brine is made of duplex steel, steel-based hot-dip aluminum or titanium material.

3. A treatment system for infinitely improving the concentration multiple of circulating cooling water according to claim 1, characterized in that: The sedimentation device is a high-density sedimentation tank.

4. A treatment system for infinitely increasing the concentration multiple of circulating cooling water according to claim 1, characterized in that: The filter is a sand filter or a fiber ball filter.

5. A treatment system for infinitely increasing the concentration multiple of circulating cooling water according to claim 1, characterized in that: It also includes a PH regulating device, which is connected to the cooler water collecting tray and the spray water replenishing device pipeline.

6. A treatment system for infinitely increasing the concentration multiple of circulating cooling water according to claim 1, characterized in that: It also includes a cooling water supply pump and a cooler spray pump; the cooling water supply pump is installed on the pipeline connecting the cooling water pool and the user end, and the cooler spray pump is installed on the pipeline connecting the cooler water collection tray and the electrochemical descaling device; It also includes a filter water supply pump and a filter backwash drainage pump; the filter water supply pump is installed on the pipeline connecting the filter and the intermediate water tank, and the filter backwash drainage pump is installed on the pipeline connecting the filter backwash regulating tank and the electrochemical descaling device; It also includes a mud and water lifting pump and a sludge lifting pump; the mud and water lifting pump is installed on the pipeline connecting the sedimentation and sludge discharge tank with the sludge concentration device, and the sludge lifting pump is installed on the pipeline connecting the sludge dewatering device with the sludge regulating tank.

7. A method for infinitely increasing the concentration multiple of circulating cooling water, based on a system for infinitely increasing the concentration multiple of circulating cooling water according to claim 1 or 2 or 3 or 4 or 5 or 6, characterized in that: The specific steps include: 1) The water in the cooling water pool is used by the user end. After use, the water temperature rises and is sent to the cooler for cooling, and then sent to the cooling water pool for recycling; 2) The water supply of the spray water supply device is concentrated brine, part of which is used for cooling the cooler coil, and part of which is diverted and sent to the electrochemical descaling device; 3) The electrochemical descaling device precipitates the hardness in the water in the form of soft scale, and then sends it to the sedimentation device for sedimentation treatment. After treatment, it enters the intermediate water tank and is then sent to the filter to further remove suspended matter; 4) The filter backwash drainage enters the filter backwash regulating tank for water volume adjustment and is then sent to the sedimentation device for treatment; 5) The water from the filter enters the chiller for cooling, and then returns to the water collection tray of the cooler for recycling; 6) The pH adjustment device adds acid to the spray water system; 7) The sedimentation device discharges the sludge into the sedimentation sludge tank, and the sludge is sent to the sludge thickening device to further thicken the sludge; 8) The sludge thickening device discharges sludge into the sludge regulating tank, and then sends the sludge to the sludge dewatering device for dehydration. The dry sludge is transported out for treatment, and the supernatant and the effluent from the sludge thickening device are returned to the sedimentation tank for treatment and then recycled. 9) The dosing device adds flocculating agent to the sludge dewatering device.

8. A method for infinitely increasing the concentration multiple of circulating cooling water according to claim 7, characterized in that: In the steps 1) and 2), the circulating cooling water is cooled indirectly, the circulating cooling water in the cooler tube tray for the user end is soft water or new water, and the spray water for cooling outside the cooler tube tray is concentrated brine, and the two are set separately.

9. A method for infinitely increasing the concentration multiple of circulating cooling water according to claim 8, characterized in that: The concentration multiple of the concentrated brine is continuously increased, and the concentration is infinite, and the conductivity reaches 300,000 us / cm to form a salt balance.

10. A method for infinitely increasing the concentration multiple of circulating cooling water according to claim 7, characterized in that: 5% to 10% by mass of the replenishing water of the spray replenishing device is taken for descaling, sedimentation, filtration and refrigeration treatment, and then sent back to the spray replenishing device after treatment.

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