The management method of circulating water has the saying of "three parts medicine, seven parts management method", indicating the necessity of regulation. After the circulating water treatment equipment switches to normal operation, during its heating, volatilization, and refrigeration process, the cooling circulating water is gradually concentrated, and its water quality indicators will change. The key to daily management methods is to make immediate corresponding adjustments based on the changes in the water body, and analyze the circulating water on time for each shift.

1. Calcium hardness, total alkalinity

Total alkalinity is an indicator value in the control of circulating water. When the concentration ratio is controlled steadily and there are no other external influences, the trend of scaling development in the system software can be seen from the change in total alkalinity. Strength refers to the total concentration of Ca2+and Mg2+in water, and is also a key indicator value in the actual operation control of circulating water. Be sure to control the calcium hardness and total alkalinity of the circulating water within the range specified in the secret recipe. Based on calculations, this system software controls the calcium strength (calculated as CaCO3)+total alkalinity to be around 1100mg/L; If there is a change in the water body situation, it is necessary to adjust the corresponding water-saving and stable layer secret recipe.

2. PH value

Due to the escape of CO2 in the closed cooling tower, the pH value of the circulating cooling water continues to increase with the increase of concentration factor. When the concentration factor is constant, the pH value of the circulating water also remains stable. The pH value is generally controlled between 8.0-9.2.

3. Total phosphorus and chloride ions

The purpose of measuring total nitrogen in circulating water is to better calculate the composition of organic phosphines in circulating water. The corrosion and scale inhibitor contains organic phosphine phosphates. Based on the total nitrogen analysis data of the system software, the dosage is moderately adjusted to control the total nitrogen in the circulating water between 6.0-8.0mg/L; When the total nitrogen is less than 6.0mg/L, increase the dosage of corrosion and scale inhibitors to the target value range. If it exceeds 8.0mg/L, moderately reduce the dosage.

Excessive concentration of Cl - in circulating water accelerates the corrosion of machinery and equipment, especially stainless steel equipment, which is highly sensitive to Cl -. Therefore, detection and control should be carried out during operation; In general, the concentration value of Cl - in circulating water does not change. In the absence of introducing chloride ion content externally, it can indicate a change in the salt content of circulating water. Therefore, the concentration factor of Cl - is commonly calculated based on the concentration value of Cl -, and according to the water condition of the system software, Cl - should be controlled at around 100mg/L.

4. Sticky mud

The circulating water system software has become an ideal natural environment for the growth and development of various bacteria due to its suitable environmental temperature, good natural ventilation, sufficient sunlight exposure, and other standards. In this condition, rapid proliferation of microbial strains is certain. Even if microbial strain control is done well, the number of bacteria is likely to reach 104-105/mL. If the control is not reasonable, it is still common for the number of bacteria to reach 106-108/mL. The harmfulness of microbial strains is multifaceted, mainly due to microbial sludge damage. In the software of the circulating water system, sludge is mainly a collective term for the accumulation of attached substances and suspended solids generated by biological actions. Once microbial sludge is generated, it needs to be sterilized, disinfected, cleaned and separated. There are standards to carry out complete cleaning during maintenance, and strict sterilization and separation control should be carried out during operation. When production cannot be stopped, chemical water treatment without parking can be carried out.

5. Concentration factor

The salt content of fresh filling water and the salt content of circulating water through the entire concentration process are not the same. The ratio of the two is called the concentration factor, which is a major indicator value of circulating water. Due to the inconvenience of studying salt content, in production and manufacturing, a certain type of ion concentration or conductivity that is not easy to consume and can be quickly measured in circulating water is usually selected to replace the calculation of concentration factor. For example, the solubility of fluoride is very high, making it difficult to deposit in circulating water, and the concentration value of Cl - will not change. In the absence of external introduction of chloride ion content, it can indicate a change in salt content in circulating water. Therefore, the concentration value of Cl - is commonly used to calculate concentration factor. Generally, when the concentration factor is low, the water consumption is large, and the sewage treatment capacity is also large; A high concentration factor can reduce water flow and save water to solve costs. However, if the concentration factor is too high, the strength, alkalinity, and turbidity of the circulating cooling water will increase too much, and the scale in the water will tend to expand a lot, which will increase the difficulty coefficient of scale and corrosion control. This will increase the residence time of the water treatment agent in the cooling circulating water and cause hydrolysis reaction. Therefore, the higher the K value of the circulating cooling water, the better. Taking into full consideration the conservation of water resources and the concentrated circulating water body, this operating system is selected with a concentration factor of 3.0 times.

6. Bacteria

Persistently selecting air oxidizing pesticide fungicides and non air oxidizing pesticide fungicides for replacement and application, in order to synergistically control the growth of bacteria and algae in the purification equipment of chilled water. Air oxidizing pesticide fungicides include chlorine dioxide, TH-404, and Youlujing; Non air oxidizing pesticide fungicides include isothia, TH-406, and 1227. The concentration value for each addition is 100-200mg/L (based on the amount of water enjoyed).

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