I. Introduction.
Circulating cooling water system has a wide range of applications in petrochemical, metallurgy, electric power, fertilizer, pharmaceutical, textile and other industries. Circulating cooling water treatment is to solve these problems by adding scale inhibitors, dispersants, corrosion inhibitors, biocides and other agents, changing the operating conditions, changing the material of the equipment, and combining various physical water treatment methods.
2. Three major factors affecting the function of circulating cooling water.
Corrosion, scaling, microbial growth and other problems are the three major factors affecting the function of circulating cooling water.
1) Corrosion
There are many kinds of corrosion of metal equipment in circulating cooling water, and there are many influencing factors, which can generally be divided into physical, chemical and biological elements, mainly including temperature, ion type and concentration, pH value, dissolved oxygen, water flow rate, microorganisms and the material of the metal itself.
2) Scaling. For the open circulating cooling water system, the concentration of calcium and magnesium ions in the water will continue to increase due to the continuous evaporation and concentration of water, which will increase the hardness of the circulating cooling water. When the content of calcium and magnesium ions in the water increases to a certain extent, the calcium and magnesium ions in the water will combine with the anions in the water, forming a scale layer on the inner wall of the pipe and heat exchanger of the system. The scaling layer will affect the heat transfer efficiency of the heat exchanger, the thicker the scale layer, the lower the heat transfer efficiency, and the fouling problem on the inner wall of the circulating cooling water system will seriously affect the heat exchange, so that the heat exchange efficiency is greatly reduced.
3) Microorganisms such as fungi and algae.
Due to the recycling of cooling water, the nutrient content in the water is also concentrated, which provides good living conditions for the growth and reproduction of microorganisms, so that bacteria and algae can multiply. Microorganisms emit mucus, mixed with biofilms, sediments in water, etc., that can be used to form visible sediments that can clog pipes.
3. Sharing of water treatment agent formula.
For the above-mentioned water treatment system, here is a circulating cooling water treatment agent suitable for pipe or shell open cooling water equipment, and can also be used for circulating cooling water treatment of various water quality, which has the effect of corrosion inhibition, scale inhibition and sterilization and algae killing.
Raw material ratio:
Polymaleic anhydride: easily hydrolyzed into maleic acid. used as thickener, preservative, scale inhibitor, dispersant, etc.
Preparation method: Weigh each component according to the above ratio, mix it and stir it evenly.
This product is characterized by easy availability of raw materials, small equipment investment, low cost, and can keep the pH value of circulating water at 8 9.
Fourth, summary. When dealing with circulating cooling water, it is crucial to understand its fundamentals and common problems. By using the appropriate treatment agent formulation, the problems of scaling, corrosion and microbial growth can be effectively solved, and the treatment effect of circulating cooling water can be improved. In practice, continuous monitoring of water quality and system status, as well as regular adjustment of treatment agent formulations, are key to ensuring the stable and efficient operation of the circulating cooling water system.