About the "softening" problem of water circulation cooling water circulation
2019-06-07 08:04:04
The circulating water treatment of water-cooled air conditioning systems has been a subject of debate and discussion. Current domestic status:
1 No treatment or simple drainage to control fouling or corrosion.
2 Soften the supplemented water to control the quality of the cooling water.
3 The cooling water system is equipped with an electrostatic water processor to prevent scale, descaling, sterilization and algae killing.
4 Add chemicals (scaling, corrosion inhibition, sterilization, algae killing) in the cooling water system to control scaling, corrosion and microbial growth.
According to statistics, it is not uncommon for the cooling system to degrade or even shut down due to unqualified cooling water quality. Foreign research has long found that the central air-conditioning cooling water contains a large number of Legionnaire's Disease (Legionnaire's Disease), and it is easy to spread through the air in the form of water mist and water droplets. The harm cannot be ignored. In addition, China's north and south regions span a wide range, and the water quality in the south and north is different. It is necessary to adopt different water treatment methods for different geographical environments to find a more suitable and more economical cooling water treatment and control scheme. Based on the above background, the author compares and discusses the processing technology of the cooling water system.
Numerous water-conditioning and water treatment companies have proposed using demineralized water as supplemental water for refrigerant circulating water in refrigeration and air conditioning. In fact, quite a number of central air conditioning units use a softening water unit with a cation exchange resin. It is generally believed that the use of the same demineralized water as the boiler system can prevent the problem of air conditioning refrigerant water scaling, which is one of the misunderstandings of the water quality treatment of refrigeration and air conditioning.
Analysis of this misunderstanding can be carried out in the following three aspects:
1. The root cause of scale formation in circulating water is the increase in the concentration of circulating water. The concentration of calcium and magnesium ions in the water and the concentration of carbonate ions (the product of the two) exceeds a certain value to produce scale. For air-conditioning refrigerant water, it is generally operated in a closed state, and its water loss (water replenishment amount) is very small. It can be roughly considered that the refrigerant circulating water concentration factor is 1, so the refrigerant circulating water is not as easy to generate as the cooling circulating water. A lot of scale. If the refrigerant system produces rust and sludge scale, softened water cannot solve such problems.
2. From a chemical point of view, the concentration of calcium ions and magnesium ions in circulating water has a great influence on the corrosion resistance of metals (mainly carbon steel). The higher the concentration of calcium and magnesium ions, the stronger the corrosion resistance of the metal, and the smaller the concentration of calcium and magnesium ions, the more easily the metal is corroded. If the user replaces tap water with soft water in the air conditioning refrigerant water system as a supplementary water source, the corrosion rate of the metal of the equipment pipe network will be increased. This judgment can be proved by the fact that the boiler device that uses softened water for a long time, the section of the (iron) pipe that connects the softened water into the boiler is more easily damaged than other tap water pipes, and needs to be replaced frequently. The removed pipe is covered with rust. tumor. In the actual operation of water treatment, for special water quality, such as groundwater with low total hardness as the circulating water source, not only can the calcium and magnesium ions be removed, but also the calcium ions should be metered to increase the content to the normal range (Ca2+>30mg/L). .
3. From the point of view of water consumption, the softened water device is ineffective. For example, in a building with a cooling area of ​​about 20,000 m2, the circulating water capacity of the refrigerant is about 30 m3, and the water supply capacity is 0.5 m3/h with a softened water device. (Current water air conditioner http:// design the smallest model of softening device). Then in just 3 days, 36m3 of softened water can meet the needs of 30m3 soft water. Since the refrigerant water cannot be discharged every day, it is replaced every month. Therefore, this set of equipment with an investment of nearly 10,000 yuan is in an idle state all year round. The equipment waits for the retirement after a long time from the start of installation. In addition, it also takes up space in the computer room. I believe that users understand this and will not use this device. .
The water quality section emphasizes that the water quality should be checked before the unit is used, and the water should be chemically treated as needed. Circulating water and make-up water should use tap water or industrial water. Do not use pure water, natural water or soft water. (Note: natural water refers to river water, lake water, surface water and groundwater) thus officially denying the use of demineralized water as the source of circulating water.
The cooling water system is an important part of the large air conditioning cooling water system. Maintaining qualified circulating cooling water quality is very important and deserves the attention of relevant personnel. The traditional drug treatment method is complicated in technology and environmental pollution, which brings certain difficulties to relevant personnel and is not easy to realize automatic control. E-water treatment is an emerging approach to water treatment, and technology is constantly evolving, representing emerging water treatment technologies, but electronically treating cooling water can also have some negative effects and may not be suitable for water quality in the South. As for whether the drug treatment method and the electronic treatment method are more favorable, since the amount of water handled by each unit is different, the initial investment and operating costs will be different, and it must be determined after technical and economic analysis.
1 No treatment or simple drainage to control fouling or corrosion.
2 Soften the supplemented water to control the quality of the cooling water.
3 The cooling water system is equipped with an electrostatic water processor to prevent scale, descaling, sterilization and algae killing.
4 Add chemicals (scaling, corrosion inhibition, sterilization, algae killing) in the cooling water system to control scaling, corrosion and microbial growth.
According to statistics, it is not uncommon for the cooling system to degrade or even shut down due to unqualified cooling water quality. Foreign research has long found that the central air-conditioning cooling water contains a large number of Legionnaire's Disease (Legionnaire's Disease), and it is easy to spread through the air in the form of water mist and water droplets. The harm cannot be ignored. In addition, China's north and south regions span a wide range, and the water quality in the south and north is different. It is necessary to adopt different water treatment methods for different geographical environments to find a more suitable and more economical cooling water treatment and control scheme. Based on the above background, the author compares and discusses the processing technology of the cooling water system.
Numerous water-conditioning and water treatment companies have proposed using demineralized water as supplemental water for refrigerant circulating water in refrigeration and air conditioning. In fact, quite a number of central air conditioning units use a softening water unit with a cation exchange resin. It is generally believed that the use of the same demineralized water as the boiler system can prevent the problem of air conditioning refrigerant water scaling, which is one of the misunderstandings of the water quality treatment of refrigeration and air conditioning.
Analysis of this misunderstanding can be carried out in the following three aspects:
1. The root cause of scale formation in circulating water is the increase in the concentration of circulating water. The concentration of calcium and magnesium ions in the water and the concentration of carbonate ions (the product of the two) exceeds a certain value to produce scale. For air-conditioning refrigerant water, it is generally operated in a closed state, and its water loss (water replenishment amount) is very small. It can be roughly considered that the refrigerant circulating water concentration factor is 1, so the refrigerant circulating water is not as easy to generate as the cooling circulating water. A lot of scale. If the refrigerant system produces rust and sludge scale, softened water cannot solve such problems.
2. From a chemical point of view, the concentration of calcium ions and magnesium ions in circulating water has a great influence on the corrosion resistance of metals (mainly carbon steel). The higher the concentration of calcium and magnesium ions, the stronger the corrosion resistance of the metal, and the smaller the concentration of calcium and magnesium ions, the more easily the metal is corroded. If the user replaces tap water with soft water in the air conditioning refrigerant water system as a supplementary water source, the corrosion rate of the metal of the equipment pipe network will be increased. This judgment can be proved by the fact that the boiler device that uses softened water for a long time, the section of the (iron) pipe that connects the softened water into the boiler is more easily damaged than other tap water pipes, and needs to be replaced frequently. The removed pipe is covered with rust. tumor. In the actual operation of water treatment, for special water quality, such as groundwater with low total hardness as the circulating water source, not only can the calcium and magnesium ions be removed, but also the calcium ions should be metered to increase the content to the normal range (Ca2+>30mg/L). .
3. From the point of view of water consumption, the softened water device is ineffective. For example, in a building with a cooling area of ​​about 20,000 m2, the circulating water capacity of the refrigerant is about 30 m3, and the water supply capacity is 0.5 m3/h with a softened water device. (Current water air conditioner http:// design the smallest model of softening device). Then in just 3 days, 36m3 of softened water can meet the needs of 30m3 soft water. Since the refrigerant water cannot be discharged every day, it is replaced every month. Therefore, this set of equipment with an investment of nearly 10,000 yuan is in an idle state all year round. The equipment waits for the retirement after a long time from the start of installation. In addition, it also takes up space in the computer room. I believe that users understand this and will not use this device. .
The water quality section emphasizes that the water quality should be checked before the unit is used, and the water should be chemically treated as needed. Circulating water and make-up water should use tap water or industrial water. Do not use pure water, natural water or soft water. (Note: natural water refers to river water, lake water, surface water and groundwater) thus officially denying the use of demineralized water as the source of circulating water.
The cooling water system is an important part of the large air conditioning cooling water system. Maintaining qualified circulating cooling water quality is very important and deserves the attention of relevant personnel. The traditional drug treatment method is complicated in technology and environmental pollution, which brings certain difficulties to relevant personnel and is not easy to realize automatic control. E-water treatment is an emerging approach to water treatment, and technology is constantly evolving, representing emerging water treatment technologies, but electronically treating cooling water can also have some negative effects and may not be suitable for water quality in the South. As for whether the drug treatment method and the electronic treatment method are more favorable, since the amount of water handled by each unit is different, the initial investment and operating costs will be different, and it must be determined after technical and economic analysis.
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