Treatment system for purifying circulating water of surface type indirect air cooling unit

Abstract

The utility model provides a treatment system for purifying circulating water of a surface type indirect air cooling unit, which comprises a current limiter, the current limiter is connected with a circulating water supply main pipe of the indirect air cooling unit, the current limiter is connected with a de-ironing separator, the de-ironing separator is connected with a membrane-free electric deionizer, the membrane-free electric deionizer is connected with a water outlet main isolating valve, and the water outlet main isolating valve is connected with a water outlet main isolating valve. The water outlet main isolating valve is connected with a circulating water supply main pipe of the indirect air cooling unit; a detector is arranged on a pipeline for connecting the membrane-free electric deionizer and the water outlet main isolating valve; a recirculation valve is connected between the water outlet main isolating valve and the iron remover; and the recirculation valve and the water outlet main isolating valve are in signal connection with a detector. According to the system, iron-containing oxides in the circulating water are removed through the iron remover, corrosion products in the circulating water are reduced, the circulating water is purified again through the membrane-free electric deionizer, the quality of the circulating water is further improved, efficient purification of the circulating water is achieved, and the stability and economical efficiency of system operation are remarkably improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of water treatment, in particular to a treatment system for purifying circulating water of a surface-type indirect air-cooling unit. Background Art

[0002] In recent years, surface indirect air cooling systems have been widely used in large and medium-sized thermal power plants in northern my country. In the surface indirect air cooling system, the unit circulating water system uses carbon steel transmission pipelines and aluminum tube radiators, and there are two metal systems, steel and aluminum, in the system. Since the corrosion of steel is inhibited under alkaline conditions, and the higher the pH value of the aqueous solution within a certain range, the weaker the corrosion; aluminum is an amphoteric metal, and its passivation zone pH range in aqueous solution is 4.6 to 8.3. Beyond this range, corrosion may occur. It is precisely because of the characteristics of the above-mentioned system structure that many indirect air-cooling units at home and abroad have experienced unqualified circulating water quality, corrosion and even rupture of the radiator aluminum tube bundle after commissioning, which poses a great hidden danger to the safe operation of power plants.

[0003] At present, the water quality control measures for circulating water of indirect air-cooling units mainly include regular water changes, dosing and adjustment, deoxygenation and corrosion inhibition, bypass treatment, etc. Among them, bypass treatment technology has been proposed and applied in some projects, and the specific system configurations mainly include "filtration + cationic bed", "filtration + mixed bed", "filtration + cationic bed + mixed bed" and "filtration + cationic bed + anionic bed + mixed bed" and other schemes. However, whether it is a cationic bed, anionic bed, or mixed bed, they all belong to the ion exchange method, and the resin filled in the ion exchanger will fail after a period of operation. The replacement of the resin or acid-base regeneration must be considered. However, if the resin is replaced with a new one after it fails, it will not only increase the operating cost of the power plant, but also increase the labor intensity of the operating personnel. Setting up a resin regeneration system in the original system requires adding multiple units such as acid-base unloading, acid-base storage, acid-base metering, and regeneration wastewater treatment. Not only does it make the water treatment process complicated, it also increases the investment in equipment and the floor space, and increases the economic cost of water treatment. If it is The failed resin is sent to the condensate polishing regeneration system of the main power plant. Since the polishing resin regeneration system cannot completely separate the positive and negative resins 100%, the failed resin used to treat the circulating water is introduced into the polishing regeneration system, which will inevitably cause some external resins to mix into the polishing resin. Since the quality of the indirect cooling circulating water is worse than that of the condensate, various impurities (sodium, aluminum, silicon, chloride ions, sulfate, etc.) in the circulating water will enter the condensate system of the power plant through the polishing regeneration device, causing cross contamination, thereby affecting the water vapor quality of the thermal system of the power plant and even threatening the safe operation of the steam turbine. Therefore, the existing bypass treatment system has a high cost for the treatment of the circulating water of the indirect air-cooling unit, and the water quality of the circulating water of the indirect air-cooling unit after treatment is difficult to guarantee, which is easy to cause harm to the steam turbine. Utility Model Content

[0004] In order to solve the problems that the existing bypass treatment system has high treatment cost for the circulating water of the indirect air-cooled unit, and it is difficult to ensure the water quality of the treated circulating water of the indirect air-cooled unit, which is likely to cause harm to the steam turbine, the present utility model provides a treatment system for purifying the circulating water of the surface-type indirect air-cooled unit.

[0005] To achieve the above object, the present utility model provides the following technical solutions:

[0006] The present utility model provides a treatment system for purifying the circulating water of the surface-type indirect air-cooled unit, including a flow limiter, a de-ironer, a membrane-free electrodeionizer, a detector, a recirculation valve and an outlet main isolation valve. Among them, the inlet of the flow limiter is connected to the outlet hole opened on the circulating water supply main pipe of the indirect air-cooled unit, the outlet of the flow limiter is connected to the inlet of the de-ironer, the outlet of the de-ironer is connected to the inlet of the membrane-free electrodeionizer, the outlet of the membrane-free electrodeionizer is connected to one end interface of the outlet main isolation valve, and the other end interface of the outlet main isolation valve is connected to the inlet opened on the circulating water supply main pipe of the indirect air-cooled unit;

[0007] The detector is installed on the pipeline connecting the membrane-free electrodeionizer and the outlet main isolation valve;

[0008] A recirculation valve is connected between the interface at one end of the outlet main isolation valve connected to the membrane-free electrodeionizer and the outlet of the de-ironer. The recirculation valve and the outlet main isolation valve are signal-connected to the detector, and the flow limiter is signal-connected to the user control terminal.

[0009] Preferably, the membrane-free electrodeionizer includes a plurality of inorganic ion processors connected in parallel. The inlet of each inorganic ion processor is connected to the outlet of the de-ironer, the outlet of each inorganic ion processor is connected to one end interface of a transmission main pipe through a conduit, and the other end interface of the transmission main pipe is connected to the outlet main isolation valve and the recirculation valve. The detector is installed on the transmission main pipe.

[0010] Preferably, the inorganic ion processor is filled with high-temperature resistant anion resin and high-temperature resistant cation resin.

[0011] Preferably, the temperature range of the circulating water tolerated by the inorganic ion processor is 5 - 60 °C.

[0012] Preferably, a rectifier power supply is connected to the inorganic ion processor.

[0013] Preferably, the detector includes a conductivity detector and a pH meter;

[0014] The conductivity detector and the pH meter are both installed on the main transfer pipe, and the conductivity detector installed on the main transfer pipe is close to the membrane-free electrodeionizer;

[0015] The signals of the conductivity detector and the pH meter are connected to a processor, and the processor is signal-connected to the recirculation valve and the total outlet isolation valve.

[0016] Preferably, filters are connected to the liquid outlet and the liquid inlet of the iron remover, and the filters include a security filter and a self-cleaning filter;

[0017] The self-cleaning filter is connected to the liquid inlet of the iron remover, and the liquid inlet of the self-cleaning filter is connected to the liquid outlet of the flow restrictor;

[0018] One end interface of the security filter is connected to the liquid outlet of the iron remover, and the other end interface of the security filter is respectively connected to the recirculation valve, the total outlet isolation valve and the membrane-free electrodeionizer.

[0019] Preferably, isolation valves and pressure gauges are connected to the liquid outlet and the liquid inlet of the self-cleaning filter, the liquid outlet and the liquid inlet of the iron remover, the liquid outlet and the liquid inlet of the security filter, and the liquid outlet and the liquid inlet of the membrane-free electrodeionizer.

[0020] Preferably, a total inlet isolation valve is connected to the liquid inlet of the flow restrictor, the total inlet isolation valve is connected to the liquid inlet of a booster pump, and the liquid outlet of the booster pump is connected to the liquid inlet of the flow restrictor;

[0021] The booster pump is signal-connected to the flow restrictor, and the total inlet isolation valve is signal-connected to the user control terminal.

[0022] Preferably, the flow restrictor is a flowmeter, and the flowmeter controls the booster pump to extract the circulating water volume in the circulating water supply main pipe of the indirect air-cooled unit to be 1‰ - 1.25‰ of the rated circulating water volume of a single indirect air-cooled unit.

[0023] Compared with the prior art, the utility model has the following beneficial technical effects:

[0024] The utility model provides a treatment system for purifying the circulating water of a surface indirect air-cooled unit. In this system, the circulating water in the circulating water supply main pipe of the indirect air-cooled unit is introduced into a magnetic separator through a conduit to remove iron oxides in the circulating water, reducing the corrosion products of the circulating water. The circulating water is further purified by an electrodialysis deionizer without a membrane, further improving the quality of the circulating water, achieving efficient purification of the circulating water, significantly enhancing the stability and economy of system operation. The introduction of a flow restrictor effectively controls the water flow rate entering the treatment system, ensuring the stable and efficient operation of subsequent treatment processes. At the same time, it is convenient for users to adjust the flow rate according to actual needs, enhancing the flexibility and adaptability of the system. The magnetic separator is used to remove iron oxides and other suspended impurities in the circulating water, reducing the corrosion risk of the water quality to the air-cooling equipment and extending the service life of the equipment. Subsequently, the electrodialysis deionizer without a membrane deeply purifies the water quality, removing dissolved salts, making the circulating water reach a higher purity, meeting the high-standard requirements of the indirect air-cooled unit for water quality, and ensuring the safety of the steam turbine.

[0025] Furthermore, the electrodialysis deionizer without a membrane in this system includes multiple inorganic ion processors. Through the inorganic ion processors, inorganic ions such as chloride ions, sodium ions, sulfate ions, and bicarbonate ions in the circulating water can be removed, improving the quality of the circulating water, extending the service life of pipelines and equipment, and reducing the maintenance costs and downtime caused by water quality problems. A rectifying power supply is connected to the inorganic ion processor. When the inorganic ion processor reaches a saturated state through the rectifying power supply, in-situ electrical regeneration of the inorganic ion processor can be carried out, reducing the system operation cost.

[0026] Even further, the detector in this system includes a conductivity detector and a pH meter. By integrating the conductivity detector and the pH meter, real-time and continuous monitoring of the key parameters of the treated water quality is achieved, ensuring that the effluent water quality meets the preset standards. The conductivity detector can accurately reflect the total amount of dissolved solids and the change of ion concentration in the water, while the pH meter ensures that the acidity and alkalinity of the water quality are within an appropriate range. Connecting the monitoring data to the processor realizes automatic data processing and feedback control. When it is detected that the water quality parameters deviate from the set range, the processor can respond quickly, automatically adjust the water flow path by adjusting the opening and closing states of the recirculation valve and the outlet main isolation valve, realizing re-treatment or safety isolation of the water quality, effectively avoiding the discharge of unqualified water quality, and enhancing the safety and reliability of the system.

[0027] Furthermore, a self-cleaning filter is installed at the liquid inlet of the iron remover in this system to filter large particle impurities such as sand grains and welding slag in the circulating water. A security filter is installed at the liquid outlet of the iron remover. The security filter intercepts fine particles with a particle size greater than 1 μm in the circulating water. Thus, the quality of the circulating water is improved through the self-cleaning filter and the security filter. At the same time, it avoids damage to devices such as the iron remover and the membrane-free electrodeionizer caused by impurity particles, improves the stability and service life of the system for water treatment, and reduces the treatment cost of the circulating water in the indirect air-cooled unit.

[0028] Furthermore, isolation valves and pressure gauges are connected to the liquid outlet and liquid inlet of the self-cleaning filter, the liquid outlet and liquid inlet of the iron remover, the liquid outlet and liquid inlet of the security filter, and the liquid outlet and liquid inlet of the membrane-free electrodeionizer in this system. Through the isolation valves and pressure gauges, the pressure loss at the liquid outlet and liquid inlet during the operation of the self-cleaning filter, the iron remover, the security filter, and the membrane-free electrodeionizer can be detected separately.

[0029] Furthermore, the circulating water in the indirect air-cooled unit can be isolated and controlled through the total inlet isolation valve in this system, and the amount of circulating water entering the system can be adjusted, which is convenient for system maintenance and troubleshooting. The signal connection between the booster pump and the flow limiter ensures the synchronization of the water pump operation and the flow control, and improves the accuracy and stability of the system response. The signal connection between the user control terminal and the total inlet isolation valve enables the user to obtain a more direct and convenient system control ability, which is convenient for adjusting the operation state of the circulating water system according to actual needs.

[0030] Furthermore, the flow limiter in this system is a flowmeter. The flowmeter controls the booster pump to extract the circulating water volume in the circulating water supply main pipe of the indirect air-cooled unit to be 1‰ - 1.25‰ of the rated circulating water volume of a single indirect air-cooled unit, ensuring that a stable and appropriate amount of cooling water is retained in each indirect air-cooled unit, avoiding low efficiency caused by too little water volume. By accurately controlling within the range of 1‰ - 1.25‰ of the rated circulating water volume, the treatment efficiency of the system for circulating water is effectively improved, the energy consumption and operation cost are reduced, the flexibility and response speed of the system are enhanced, and the circulating water is treated quickly. Description of the Drawings

[0031] Figure 1 It is a schematic connection diagram of a treatment system for purifying the circulating water of a surface-type indirect air-cooled unit provided by the present utility model;

[0032] In the drawings: 1. Circulating water supply main pipe of the indirect air-cooled unit; 2. Total inlet isolation valve; 3. Booster pump; 4. Flowmeter; 5. Self-cleaning filter; 6. Iron remover; 7. Security filter; 8. Membrane-free electrodeionizer; 9. Rectifying power supply; 10. Conductivity detector; 11. pH meter; 12. Recirculation valve; 13. Total outlet isolation valve. Detailed Implementation Modes

[0033] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present utility model. Therefore, the drawings and descriptions are considered to be exemplary in nature rather than restrictive.

[0034] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0035] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0036] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0037] The embodiments of the present utility model will be described in detail below with reference to the drawings.

[0038] See Figure 1, the present utility model proposes a treatment system for purifying the circulating water of a surface indirect air-cooled unit. This system includes a flow restrictor, a de-ironer 6, a filter, a membrane-free electrodeionizer 8, a rectifier power supply 9, a detector, a recirculation valve 12, and an outlet main isolation valve 13. Among them, the inlet of the flow restrictor is connected to the outlet hole opened on the circulating water supply header pipe 1 of the indirect air-cooled unit through a conduit. The outlet of the flow restrictor is connected to the inlet of the de-ironer 6 through a conduit. The outlet of the de-ironer 6 is connected to the inlet of the filter through a conduit. The outlet of the filter is connected to the inlet of the membrane-free electrodeionizer 8 through a conduit. The outlet of the membrane-free electrodeionizer 8 is connected to one end interface of the outlet main isolation valve 13 through a conduit. The other end interface of the outlet main isolation valve 13 is connected to the inlet opened on the circulating water supply header pipe 1 of the indirect air-cooled unit through a conduit. A detector is installed on the pipeline connecting the outlet of the membrane-free electrodeionizer 8 and one end interface of the outlet main isolation valve 13. A recirculation valve 12 is connected through a conduit between the one end interface of the outlet main isolation valve 13 connected to the membrane-free electrodeionizer 8 and the outlet of the filter. The recirculation valve 12 and the outlet main isolation valve 13 are signal-connected to the detector;

[0039] The membrane-free electrodeionizer 8 includes a plurality of inorganic ion processors, and the plurality of inorganic ion processors are connected in parallel, that is, the inlets of the plurality of inorganic ion processors are connected together, and the outlets of the plurality of inorganic ion processors are connected together. The inlet of each inorganic ion processor is connected to the outlet of the filter through a conduit. The outlet of each inorganic ion processor is connected to one end interface of a transmission main pipe through a conduit. The other end interface of the transmission main pipe is connected to one end interface of the outlet main isolation valve 13 and one end interface of the recirculation valve 12. A detector is installed on the transmission main pipe. Among them, the resin filled in each inorganic ion processor is high-temperature resistant anion resin and high-temperature resistant cation resin to improve the temperature resistance of the device. The temperature range that the membrane-free electrodeionizer 8 can withstand for the circulating water is: 5 - 60 °C. The treatment of the circulating water in the circulating water supply header pipe 1 of the indirect air-cooled unit by this system is to first control the amount of circulating water flowing into this system through the flow restrictor. The circulating water then flows through the de-ironer 6 to remove the iron oxides (Fe2O3 and Fe3O4) in the circulating water, and then flows through the filter to remove the impurity particles in the circulating water, and then flows into the plurality of inorganic ion processors in the membrane-free electrodeionizer 8 to remove the inorganic ions such as chloride ions, sodium ions, sulfate radicals, and bicarbonate radicals in the circulating water. Then, it is monitored online through the detector. When the water quality is qualified, the outlet main isolation valve 13 is opened and the recirculation valve 12 is closed, and the treated circulating water is incorporated into the circulating water supply header pipe 1 of the indirect air-cooled unit for circulation.

[0040] See Figure 1, the membrane-free electrodeionizer 8 further includes a rectifying power supply 9, which is electrically connected to a plurality of inorganic ion processors in the membrane-free electrodeionizer 8 respectively. When saturation occurs in one or more of the inorganic ion processors, the rectifying power supply 9 is started to perform in-situ electro-regeneration on them. After the regeneration is completed, they can be put into operation again.

[0041] See Figure 1 , an outlet is opened on the circulating water supply main pipe 1 of the indirect air-cooled unit, and one end interface of the inlet total isolation valve 2 is connected through a conduit. The other end interface of the inlet total isolation valve 2 is connected to the liquid inlet of a booster pump 3 through a conduit. The liquid outlet of the booster pump 3 is connected to the liquid inlet of a flow limiter through a conduit. The booster pump 3 is signal-connected to the flow limiter. The flow limiter controls the amount of circulating water extracted from the circulating water supply main pipe 1 of the indirect air-cooled unit by the booster pump 3 and the opening degree of the inlet total isolation valve 2. The inlet total isolation valve 2 is signal-connected to the user control terminal. The user control terminal controls the opening and closing of the inlet total isolation valve 2 based on the detected conductivity and pH value of the circulating water in the circulating water supply main pipe 1 of the indirect air-cooled unit. That is, when the conductivity of the circulating water exceeds 2 μS / cm and the pH value is greater than 8.3, the inlet total isolation valve 2 is controlled to open.

[0042] See Figure 1 , the flow limiter is a flow meter 4, and the flow meter 4 is used to control the amount of circulating water extracted from the circulating water supply main pipe 1 of the indirect air-cooled unit by the booster pump 3 to be 1‰ - 1.25‰ of the rated circulating water volume of a single indirect air-cooled unit.

[0043] See Figure 1 , the filter includes a security filter 7 and a self-cleaning filter 5. The security filter 7 is connected to the liquid outlet of the iron remover 6, and the security filter 7 intercepts fine particles with a particle size greater than 1 μm in the circulating water. The self-cleaning filter 5 is connected to the liquid inlet of the iron remover 6, and the self-cleaning filter 5 removes large particle impurities such as sand grains and welding slag in the circulating water flowing into the iron remover 6.

[0044] See Figure 1 , the detector includes a conductivity detector 10 and a pH meter 11. The conductivity detector 10 and the pH meter 11 are respectively installed on the pipeline between the outlet of the membrane-free electrodeionizer 8 and one end interface of the outlet total isolation valve 13, and the conductivity detector 10 is close to the membrane-free electrodeionizer 8.

[0045] The signals of the conductivity detector 10 and the pH meter 11 are connected to a processor, and the processor is signal-connected to the recirculation valve 12 and the total outlet isolation valve 13. The conductivity detector 10 is used to detect whether the conductivity of the circulating water after being treated by the membrane-free electrodeionizer 8 is qualified. If it is detected that the conductivity of the circulating water does not exceed 0.2 μS / cm, it is determined to be qualified. The pH meter 11 is used to detect whether the pH value of the circulating water is qualified. If it is detected that the pH value of the circulating water is within the range of 6.5 ≤ pH ≤ 7.5, it is determined to be qualified. When the processor receives the qualified signals determined by the conductivity detector 10 and the pH meter 11, it controls the actions of the recirculation valve 12 and the total outlet isolation valve 13.

[0046] Preferably, isolation valves and pressure gauges are connected to the liquid outlet and inlet of the self-cleaning filter 5, the liquid outlet and inlet of the iron remover 6, the liquid outlet and inlet of the security filter 7, and the outlet and inlet of the membrane-free electrodeionizer 8. When the self-cleaning filter 5, the iron remover 6, the security filter 7, and the membrane-free electrodeionizer 8 fail or need maintenance, these devices can be isolated, and at the same time, the pressure losses at the outlets and inlets of these devices during operation can be monitored.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0048] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention fall within the protection scope of the claims of the present invention.

Claims

1. A treatment system for purifying the circulating water of a surface indirect air-cooled unit, characterized in that, It includes a flow limiter, a magnetic separator (6), a membrane-free electrodeionizer (8), a detector, a recirculation valve (12) and an outlet main isolation valve (13). Among them, the inlet of the flow limiter is connected to the outlet hole opened on the circulating water supply header pipe (1) of the indirect air-cooled unit. The outlet of the flow limiter is connected to the inlet of the magnetic separator (6). The outlet of the magnetic separator (6) is connected to the inlet of the membrane-free electrodeionizer (8). The outlet of the membrane-free electrodeionizer (8) is connected to one end interface of the outlet main isolation valve (13). The other end interface of the outlet main isolation valve (13) is connected to the inlet opened on the circulating water supply header pipe (1) of the indirect air-cooled unit; The detector is installed on the pipeline connecting the membrane-free electrodeionizer (8) and the outlet main isolation valve (13); A recirculation valve (12) is connected between the end interface of the outlet main isolation valve (13) connected to the membrane-free electrodeionizer (8) and the outlet of the magnetic separator (6). The recirculation valve (12) and the outlet main isolation valve (13) are signal-connected to the detector, and the flow limiter is signal-connected to the user control terminal.

2. The treatment system for purifying the circulating water of a surface indirect air-cooled unit according to claim 1, characterized in that, The membrane-free electrodeionizer (8) includes a plurality of inorganic ion processors. The plurality of inorganic ion processors are connected in parallel. The inlet of each inorganic ion processor is connected to the outlet of the magnetic separator (6). The outlet of each inorganic ion processor is connected to one end interface of a transmission main pipe through a conduit. The other end interface of the transmission main pipe is connected to the outlet main isolation valve (13) and the recirculation valve (12). The detector is installed on the transmission main pipe.

3. The treatment system for purifying the circulating water of a surface-type indirect air-cooled unit according to claim 2, wherein, The inorganic ion processor is filled with high-temperature resistant anion resin and high-temperature resistant cation resin.

4. A treatment system for purifying the circulating water of a surface-type indirect air-cooled unit according to claim 3, characterized in that, The temperature range of the circulating water tolerated by the inorganic ion processor is 5 - 60 °C.

5. The treatment system for purifying the circulating water of a surface-type indirect air-cooled unit according to claim 4, characterized in that, A rectifying power supply (9) is connected to the inorganic ion processor.

6. The treatment system for purifying the circulating water of a surface-type indirect air-cooled unit according to claim 2, wherein, The detector includes a conductivity detector (10) and a pH meter (11); Both the conductivity detector (10) and the pH meter (11) are installed on the transmission main pipe, and the conductivity detector (10) installed on the transmission main pipe is close to the membrane-free electrodeionizer (8); The conductivity detector (10) and the pH meter (11) are signal-connected to a processor, and the processor is signal-connected to the recirculation valve (12) and the outlet main isolation valve (13).

7. A treatment system for purifying the circulating water of a surface-type indirect air-cooled unit according to claim 1, characterized in that, Filters are connected to the outlet and inlet of the magnetic separator (6). The filters include a security filter (7) and a self-cleaning filter (5); The self-cleaning filter (5) is connected to the inlet of the magnetic separator (6), and the inlet of the self-cleaning filter (5) is connected to the outlet of the flow limiter; One end interface of the security filter (7) is connected to the outlet of the magnetic separator (6), and the other end interface of the security filter (7) is respectively connected to the recirculation valve (12), the outlet main isolation valve (13) and the membrane-free electrodeionizer (8).

8. A treatment system for purifying the circulating water of a surface type indirect air-cooled unit according to claim 7, characterized in that, Isolation valves and pressure gauges are connected to the liquid outlet and inlet of the self-cleaning filter (5), the liquid outlet and inlet of the iron remover (6), the liquid outlet and inlet of the security filter (7), and the liquid outlet and inlet of the membrane-free electrodeionizer (8).

9. The treatment system for purifying the circulating water of a surface-type indirect air-cooled unit according to claim 1, wherein The inlet of the flow restrictor is connected to the total inlet isolation valve (2) for water, the total inlet isolation valve (2) for water is connected to the inlet of the booster pump (3), and the outlet of the booster pump (3) is connected to the inlet of the flow restrictor; The booster pump (3) is signal-connected to the flow restrictor, and the total inlet isolation valve (2) for water is signal-connected to the user control terminal.

10. The treatment system for purifying the circulating water of a surface-type indirect air-cooled unit according to claim 9, characterized in that, The flow restrictor is a flowmeter (4), and the flowmeter (4) controls the booster pump (3) to extract the circulating water volume in the circulating water supply main pipe (1) of the indirect air-cooled unit to be 1‰ - 1.25‰ of the rated circulating water volume of a single indirect air-cooled unit.

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