Treatment system and method for infinitely increasing cycles of concentration of circulating cooling water

Abstract

The present invention relates to the technical field of water treatment, and specifically relates to a treatment system and method for infinitely increasing the cycles of concentration of circulating cooling water. The system comprises an indirect cooling section, a split-flow treatment section and a sludge treatment section; the entire system has no effluent discharge, such that the cycles of concentration of the system are infinitely increased; and finally, partial water is removed by means of sludge discharge from the system, and thus partial salt is carried away, thereby achieving salt balance. A series of measures are taken to solve the problems in a spray water system, such as corrosion, scaling and microbial and algal growth, thereby enabling the stable cyclic operation of the system, realizing water conservation and consuming concentrated brine, and thus resolving the challenge of concentrated brine treatment. The present invention closely aligns with the circular economy, realizes the resource utilization of concentrated brine, and achieves water conservation and pollution reduction, thereby yielding significant economic and social benefits.

Description

A treatment system and method for unlimitedly increasing the concentration multiple of circulating cooling water TECHNICAL FIELD

[0001] The present application relates to the technical field of water treatment, in particular to a treatment system and method for unlimitedly increasing the concentration multiple of circulating cooling water. BACKGROUND

[0002] Increasing the concentration multiple of circulating cooling water is beneficial to saving fresh water, but the increase of the concentration multiple causes the enrichment of salt, hardness, chloride ions and the like in water, which produces side effects such as corrosion, fouling, sludge deposition, and reduction of heat exchange efficiency on heat exchange equipment, pipelines and other facilities; microorganisms, bacteria and algae grow biological slime, which is easy to cause microbial corrosion and easily block pipelines, heat exchange equipment and the like. The water treatment membrane method produces concentrated brine, and the disposal of concentrated brine has been a difficult problem.

[0003] At present, many enterprises send concentrated brine to some users with low water quality requirements, such as the metallurgical industry to blast furnaces for slagging, which can consume part of the concentrated brine, but the high salt content affects the water slag quality of the blast furnace, and it is difficult to be used as a secondary material such as building material, and the high chloride ion corrodes the slagging equipment, and there are problems such as water slag hardening caused by fouling; some enterprises also deeply treat the concentrated brine to produce by-product sodium chloride and sodium sulfate, but the utilization rate of the product is low, the sales are difficult, and part of the hazardous waste needs to be treated, the investment and operating cost of salt separation are extremely high, and the enterprises are difficult to bear. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the present application provides a treatment system and method for unlimitedly increasing the concentration multiple of circulating cooling water, which can unlimitedly increase the concentration multiple of circulating cooling water, which is beneficial to saving fresh water, and can consume concentrated brine, so that the disposal of concentrated brine is no longer a difficult problem, and a large amount of investment and operating cost is saved.

[0005] To achieve the above purpose, the present application adopts the following technical scheme:

[0006] A treatment system for unlimitedly increasing the concentration multiple of circulating cooling water, comprising an indirect cooling part, a shunt 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 tray, the cooler water collecting tray is connected with a spraying water supplement device; the shunt treatment part comprises a water chiller, an electrochemical descaling device, a sedimentation device, an intermediate pool, a filter and a filter backwashing conditioning pool, the water chiller, the cooler water collecting tray, the electrochemical descaling device, the sedimentation device, the intermediate pool, the filter and the filter backwashing conditioning pool are connected by pipelines; the sludge treatment part comprises a dosing device, a sludge dewatering device, a sludge conditioning pool, a sludge concentration device and a sedimentation sludge discharge pool, the dosing device, the sludge dewatering device, the sludge conditioning pool, the sludge concentration device and the sedimentation sludge discharge pool are connected with the sedimentation device by pipelines.

[0007] Further, the cooler is a corrosion-resistant sealed 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] Further, the sedimentation device is a high-density sedimentation tank.

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

[0010] Further, it further comprises a PH adjusting device connected with the cooler water collecting tray and the spraying water supplement device by pipelines.

[0011] Further, it further comprises a cooling water supply pump and a cooler spraying pump; the cooling water supply pump is installed on the pipeline connecting the cooling water pool and the user end, and the cooler spraying pump is installed on the pipeline connecting the cooler water collecting tray and the electrochemical descaling device; it further comprises a filter water supply pump and a filter backwashing drainage pump; the filter water supply pump is installed on the pipeline connecting the filter and the intermediate pool, and the filter backwashing drainage pump is installed on the pipeline connecting the filter backwashing conditioning pool and the electrochemical descaling device; it further comprises a sludge and water lifting pump and a sludge lifting pump; the sludge and water lifting pump is installed on the pipeline connecting the sedimentation sludge discharge pool and the sludge concentration device, and the sludge lifting pump is installed on the pipeline connecting the sludge dewatering device and the sludge conditioning pool.

[0012] A treatment method for unlimitedly increasing the concentration multiple of circulating cooling water, which is based on the above-mentioned system and specifically comprises the following steps:

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

[0014] 2. The water supplement of the spraying water supplement device is concentrated brine, a part of which is used for cooling the cooler coil, and a part of which is shunted and sent to the electrochemical descaling device;

[0015] 3. The electrochemical descaling device sends the hardness in the water in the form of soft scale to the sedimentation device for sedimentation treatment, and then to the intermediate water pool, and then to the filter for further removal of suspended solids;

[0016] 4. The backwash water of the filter is sent to the filter backwash adjustment tank for water adjustment, and then to the sedimentation device for treatment;

[0017] 5. The filter effluent is cooled by the cold water machine, and then recycled to the cooling tower water collection tray;

[0018] 6. The PH adjusting device adds acid to the spray water system;

[0019] 7. The sedimentation device discharges sludge to the sedimentation sludge pool, and then sends the sludge to the sludge thickening device for further sludge thickening;

[0020] 8. The sludge thickening device discharges sludge to the sludge adjustment tank, and then sends the sludge to the sludge dewatering device for dewatering, and then transports the dry sludge for treatment, and then recycles the supernatant and the sludge thickening device effluent to the sedimentation tank for treatment.

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

[0022] Further, in steps 1) and 2), the circulating cooling water adopts indirect cooling, the circulating cooling water in the cooling tower pipe tray is soft water or new water, and the spray water for cooling outside the cooling tower pipe tray is concentrated brine, which are separately arranged.

[0023] Further, the concentration multiple of the concentrated brine is continuously improved, and the concentrated brine is infinitely concentrated to form a salt balance with an electrical conductivity of 300,000 us / cm.

[0024] Further, 5% to 10% of the spray water supplement device is taken for descaling, sedimentation, filtration, and refrigeration treatment, and then sent back to the spray water supplement device.

[0025] Compared with the prior art, the beneficial effects of the present application are:

[0026] 1. The concentrated brine is supplemented to the circulating water system as the spray water of the cooling tower, so that the concentration multiple of the spray water is infinitely improved, and only the problems of corrosion, scaling, and sludge sedimentation at the circulating water treatment closed cooling tower end need to be studied, and the problems at the user end are avoided, thereby reducing the risk range. Part of the spray water is branched off for treatment, and the hardness and suspended solids of the spray water system are removed, and scaling is controlled by adjusting the PH; the electrical conductivity of the spray water is controlled at about 300,000 us / cm to prevent the growth of microorganisms and the generation of slime and microbial corrosion of equipment; through sludge treatment, finally, the sludge containing water is generated, and the sludge is discharged to take away part of the salt, thereby forming a salt balance.

[0027] The whole system has no external drainage, the concentration multiple of the system is infinitely improved, finally part of water is taken out through the system sludge discharge, and part of salt is taken away, and salt balance is formed. Through a series of measures, the problems of corrosion, scaling, microorganisms and algae of the spray water system are solved, so that the system can be stably circulated, water is saved, concentrated brine is consumed, and the problem of concentrated brine treatment is solved. The present application closely follows the circular economy, realizes the resource utilization of concentrated brine, saves water and reduces pollution, and has remarkable economic and social benefits.

[0028] 2、The present application adopts corrosion-resistant closed coolers, which can prevent corrosion of chloride ions and the like. When the concentration of chloride ions reaches a certain height, the corrosion efficiency decreases, and the corrosion can be effectively reduced.

[0029] 3、The present application adopts electrochemical descaling. The spray water treated by diversion is subjected to the action of electric current to form an alkaline environment near the cathode, the PH value is increased, and hydroxyl ions and carbonate ions are enriched. When calcium and magnesium ions pass through the area, calcium carbonate, magnesium hydroxide and other precipitates are generated. These precipitates are adsorbed on the cathode plate or suspended in water, and under the action of an electric field, the crystallization process of CaCO3 can be interfered with, the crystal lattice is distorted, and irregular aragonite structure crystals are formed. The lattice distortion makes the scale into amorphous soft scale, the crystallization of the scale is not easy to grow, there are a large number of voids in the scale layer, the adhesion between them is poor, and the scale can be easily washed away in water flow and discharged with the blowdown water. In this way, the generation of dense hard scale (calcite structure) is inhibited. BRIEF DESCRIPTION OF DRAWINGS

[0030] Fig. 1 is a schematic diagram of the structure and process principle of the indirect cooling part of the present application.

[0031] Fig. 2 is a schematic diagram of the structure and process principle of the diversion treatment part of the present application.

[0032] Fig. 3 is a schematic diagram of the structure and process principle of the sludge treatment part of the present application.

[0033] In the figure: 1-cooling water pool 2-cooling water supply pump 3-user end 4-closed cooler 5-cooler coil 6-cooler water collecting tray 7-cooler spray pump 8-spray water supplement device 9-electrochemical descaling device 10-precipitation device 11-intermediate water pool 12-filter water supply pump 13-filter 14-cooling water machine 15-filter backwash conditioning pool 16-filter backwash drainage pump 17-PH adjusting device 18-sludge discharge pool 19-sludge-lifting pump 20-sludge thickening device 21-sludge conditioning pool 22-sludge-lifting pump 23-sludge dewatering device 24-dosing device DETAILED DESCRIPTION

[0034] The application discloses a treatment system and method for infinitely improving the concentration multiple of circulating cooling water.

[0035] The specific embodiment of the application is further described below with reference to the drawings:

[0036] The application discloses a treatment system for infinitely improving the concentration multiple of circulating cooling water, which comprises an indirect cooling part, a shunt treatment part and a sludge treatment part.

[0037] As shown in FIG. 1, the indirect cooling part comprises 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 the 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 of chloride ions and the like. At the same time, the materials of other equipment in contact with the spray water also need to be made of corrosion-resistant materials or be subjected to corrosion prevention treatment. When the concentration of chloride ions reaches a certain height, the corrosion efficiency decreases, which can effectively reduce corrosion. The closed cooler 4 comprises a cooler coil 5 and a cooler water collecting tray 6.

[0038] The outlet of the cooling water pool 1 is connected with the inlet pipeline of the cooling water supply pump 2, the outlet of the cooling water supply pump 2 is connected with the inlet pipeline of the user end 3, the outlet of the user end 3 is connected with the pipeline of the cooler coil 5, the cooler coil 5 is connected with the inlet pipeline of the cooling water pool 1. The spray water supplement device 8 is connected with the cooler water collecting tray 6, the outlet of the cooler water collecting tray 6 is connected with the inlet pipeline of the cooler spray pump 7, and the outlet of the cooler spray pump 7 is connected with the cooler coil 5 and the electrochemical descaling device 9 through pipelines.

[0039] As shown in FIG. 2, the shunt treatment part comprises a water cooler 14, an electrochemical descaling device 9, a sedimentation device 10, an intermediate water pool 11, a filter water supply pump 12, a filter 13, a filter backwashing adjusting pool 15, a filter backwashing drainage pump 16 and a PH adjusting 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 filter 13 outlet is connected with the inlet pipeline of the chiller 14, the chiller 14 outlet is connected with the pipeline of the cooler water collecting disc 6. The filter 13 outlet is connected with the inlet pipeline of the filter backwash adjusting pool 15, the filter backwash adjusting pool 15 outlet is connected with the inlet pipeline of the filter backwash drainage pump 16, the filter backwash drainage pump 16 outlet is connected with the inlet pipeline of the electrochemical scale removal device 9 and the sedimentation device 10 respectively, the sedimentation device 10 outlet is connected with the inlet pipeline of the intermediate water pool 11, the intermediate water pool 11 outlet is connected with the inlet pipeline of the filter water supply pump 12, the filter water supply pump 12 outlet is connected with the inlet pipeline of the filter 13. The PH adjusting device 17 is connected with the pipeline of the cooler water collecting disc 6 and the spray water supplement device 8.

[0041] As shown in Fig. 3, the sludge treatment part includes a dosing device 24, a sludge dewatering device 23, a sludge lifting pump 22, a sludge adjusting pool 21, a sludge thickening device 20, a sludge-water lifting pump 19 and a sedimentation sludge pool 18.

[0042] The dosing device 24 is connected with the pipeline of the sludge dewatering device 23, the sludge dewatering device 23 outlet is connected with the inlet pipeline of the sedimentation device 10, the sedimentation device 10 outlet is connected with the inlet pipeline of the sedimentation sludge pool 18, the sedimentation sludge pool 18 outlet is connected with the inlet pipeline of the sludge-water lifting pump 19, the sludge-water lifting pump 19 outlet is connected with the inlet pipeline of the sludge thickening device 20, the sludge thickening device 20 outlet is connected with the inlet pipeline of the sludge adjusting pool 21, the sludge adjusting pool 21 outlet is connected with the inlet pipeline of the sludge lifting pump 22, the sludge lifting pump 22 outlet is connected with the inlet pipeline of the sludge dewatering device 23.

[0043] The circulating cooling water system of the application adopts the indirect cooling mode, the cooling adopts the corrosion-resistant closed cooler, the spray cooling water (cooling medium water) supplement of the closed cooler adopts the concentrated brine or other water, the spray water concentration multiple is continuously improved (infinite concentration), and finally the salt balance is formed when the electric conductivity is about 300,000 us / cm. The hardness and suspended solids in the spray water system are removed through the shunt treatment. The water content of the scale and sludge produced by the shunt treatment of the spray water is high, the supernatant is returned to the spray water system, the sludge after dewatering contains part of the water and carries part of the salt in the system, so that the salt balance of the spray water system is formed.

[0044] The cooling coil 5 is used for circulating cooling water of the user end, and soft water or fresh water with good water quality can be used as make-up water. The spray water outside the cooling coil 5 is concentrated brine or other water sources as make-up water. The spray water system removes part of the water through evaporation, splashing and sludge discharge, and does not discharge or emit other emissions, so that the spray water is continuously concentrated, and finally forms water and salt balance. Due to the continuous increase of the concentration multiple of the spray water system, scaling will become more and more serious, and hardness and suspended solids are removed through shunt treatment. Since the spray water system operates in an extremely high salt environment, microorganisms and algae are difficult to survive, and bactericidal and algae-killing agents do not need to be added.

[0045] Indirect cooling is to use concentrated brine as spray water, which is set separately from the cooling water in the cooling coil 5 to avoid corrosion of the user end heat exchange equipment by the spray water. Shunt 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, so that the spray water does not scale, the suspended solids content is reduced, and the spray water temperature is reduced.

[0046] Descaling uses electrochemical descaling. The spray water treated by shunt treatment forms an alkaline environment near the cathode under the action of electric current, the PH value increases, and hydroxyl ions and carbonate ions are enriched. When calcium and magnesium ions pass through this area, calcium carbonate and magnesium hydroxide precipitates are generated. These precipitates will be adsorbed on the cathode plate or suspended in the water. Under the action of the electric field, it 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. The scale becomes amorphous soft scale, which is not easy to grow in crystallization, and there are a large number of voids in the scale layer, which have poor adhesion to each other and are easily washed away in the water flow and can be discharged with the blowdown water. This inhibits the formation of dense hard scale (calcite structure).

[0047] Sedimentation can use high-density sedimentation tanks and other sedimentation facilities. The effluent enters the filtration treatment, and the sediment enters the sludge treatment system. Filtration can use sand or fiber ball filters, and the effluent enters the next stage of treatment. The backwash drainage is collected and uniformly sent to the front-end sedimentation facility. Refrigeration treatment uses a water chiller 14 to set the water temperature after treatment according to the water temperature in summer and the user's demand water temperature. Sludge treatment is to collect the sediment discharge and uniformly send it to a sludge thickening device 20. The sludge is sent to a sludge dewatering device 23 for dewatering after being thickened. The sludge thickening effluent and the supernatant produced by sludge dewatering are both returned to the sedimentation device 10 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, which is realized based on the above system and specifically includes the following steps:

[0049] 1. The circulating cooling water supply pump 2 draws water from the cooling water tank 1 and supplies it to the user end 3. After use, the water temperature rises and returns to the closed cooler 4 for cooling before entering the cooling water tank 1 for reuse. During this process, the circulating cooling water does not come into contact with the outside, which can effectively maintain the water quality.

[0050] 2. The spray water replenishment 8 in the closed cooler 4 is replenished with concentrated brine or other water according to the liquid level in the cooler water collection pan 6. The water is then pumped up by the cooler spray pump 7. Part of the water is used for cooling the cooler coil 5, and the rest is diverted and sent to the electrochemical descaling device 9 for further treatment.

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

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

[0053] 5. Water from filter 13 enters chiller 14 for cooling, and after cooling, it returns to cooler water collection tray 6 for recycling.

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

[0055] 7. The sludge from the sedimentation device 10 is discharged into the sedimentation and sludge discharge tank 18, and then sent to the sludge thickening device 20 for further thickening via the sludge lift pump 19.

[0056] 8. The sludge thickening device 20 discharges sludge to the sludge equalization tank 21, and then sends it to the sludge dewatering device 23 for dewatering via the sludge lifting pump 22. The dried sludge is transported off-site for treatment, and the supernatant and effluent from the sludge thickening device are returned to the sedimentation tank for treatment and reuse.

[0057] 9. The dosing device 24 adds flocculant to the sludge treatment system.

[0058] The entire system has no external drainage, and the concentration ratio can be increased infinitely. Ultimately, some water is removed through system sludge discharge, while some salt is carried away, achieving a salt balance. By implementing a series of measures to solve problems such as corrosion, scaling, and microbial algae growth in the spray water system, the system can be used stably in a circular manner, saving water while consuming concentrated brine and solving the problem of concentrated brine treatment. This invention closely adheres to the circular economy, realizing the resource utilization of concentrated brine, saving water and reducing pollution, and achieving significant economic and social benefits.

[0059] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A treatment system for unlimitedly increasing the concentration multiple of circulating cooling water, characterized in that it comprises an indirect cooling part, a shunt treatment part and a sludge treatment part; the indirect cooling part comprises a cooling water pool, a user end and a cooler connected by pipes, the cooler comprises a cooler coil and a cooler water collecting pan, the cooler water collecting pan is connected with a spraying water supplement device; the shunt treatment part comprises a chiller, an electrochemical scale removal device, a sedimentation device, an intermediate water pool, a filter and a filter backwashing conditioning pool, the chiller, the cooler water collecting pan, the electrochemical scale removal device, the sedimentation device, the intermediate water pool, the filter and the filter backwashing conditioning pool are connected by pipes; the sludge treatment part comprises a dosing device, a sludge dewatering device, a sludge conditioning pool, a sludge concentration device and a sedimentation sludge discharge pool, the dosing device, the sludge dewatering device, the sludge conditioning pool, the sludge concentration device and the sedimentation sludge discharge pool are connected with the sedimentation device by pipes. The cooler is a corrosion-resistant closed cooler, the part in contact with the concentrated brine is made of duplex steel, steel-based hot-dip aluminum or titanium material. The sedimentation device is a high-density sedimentation tank. The filter is a sand filter or a fiber ball filter. It further comprises a PH adjusting device connected with the cooler water collecting pan and the spraying water supplement device by pipes.

2. The system of claim 1, wherein, It further comprises a cooling water supply pump and a cooler spraying pump; the cooling water supply pump is installed on the pipe connecting the cooling water pool and the user end, and the cooler spraying pump is installed on the pipe connecting the cooler water collecting pan and the electrochemical scale removal device; 3. The system of claim 1, wherein the system further comprises a pH adjuster. It further comprises a filter water supply pump and a filter backwashing drainage pump; the filter water supply pump is installed on the pipe connecting the filter and the intermediate water pool, and the filter backwashing drainage pump is installed on the pipe connecting the filter backwashing conditioning pool and the electrochemical scale removal device; 4. The system of claim 1, wherein the system further comprises a pH adjuster. It further comprises a sludge and water lifting pump and a sludge lifting pump; the sludge and water lifting pump is installed on the pipe connecting the sedimentation sludge discharge pool and the sludge concentration device, and the sludge lifting pump is installed on the pipe connecting the sludge dewatering device and the sludge conditioning pool.

5. The system of claim 1, wherein the system further comprises a pH adjuster. Specifically, the steps include:

6. The system of claim 1, wherein the system is characterized by: 1) The water in the cooling water pool is used by the user end, the temperature of the used water is increased, and then the water is sent to the cooler for cooling, and then the water is sent to the cooling water pool for recycling; 2) The water supplement of the spraying water supplement device is concentrated brine, a part of which is used for cooling the cooler coil, and the other part is sent to the electrochemical scale removal device for shunt treatment; 3) The electrochemical scale removal device precipitates hardness in the water in the form of soft scale, and then the water is sent to the sedimentation device for sedimentation treatment, and then the water is sent to the intermediate water pool, and then the water is sent to the filter for further removal of suspended solids; 7. A treatment method for unlimitedly increasing the concentration multiple of circulating cooling water, which is implemented based on the treatment system for unlimitedly 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, 4) The filter backwashing drainage enters the filter backwashing conditioning pool for water quantity adjustment, and then the water is sent to the sedimentation device for treatment; 5) The filter effluent enters the chiller for cooling, and then the water is returned to the cooler water collecting pan for recycling; 6) The PH adjusting device adds acid to the spraying water system; 7) The sedimentation device discharges sludge to the sedimentation sludge discharge pool, and then the sludge is sent to the sludge concentration device for further concentration of the sludge; 8) The sludge concentration device discharges sludge to the slurry conditioning pool, and then the sludge is sent to the sludge dewatering device for dewatering, the dry sludge is transported out for treatment, and the supernatant and the sludge concentration device effluent are returned to the sedimentation tank for treatment and recycling; 9) The dosing device adds flocculating agent to the sludge dewatering device. ​ ​ ​ ​ 8. The method of claim 7, wherein the method is characterized by, In the steps 1) and 2), the circulating cooling water is indirectly cooled, the circulating cooling water in the cooler pipe disc for the user end is soft water or fresh water, and the spray water for cooling the outside of the cooler pipe disc is concentrated salt water, which are separately arranged.

9. The method of claim 8, wherein the method is characterized by, The concentrated salt water is continuously concentrated, infinitely concentrated, and reaches the salt balance with the conductivity of 300,000 us / cm.

10. The method of claim 7, wherein the method is characterized by, The spray water with the mass percentage of 5-10% is treated by descaling, precipitation, filtration and refrigeration, and then is sent back to the spray water supplement device.

Images