Application of the hottest chlorine dioxide in alg

2022-08-06
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At present, the circulating cooling water system tends to use the alkaline organic phosphorus formula as the water quality stabilizer, which provides a nutrient source for the reproduction of bacteria and algae. Bacteria, fungi, algae, protozoa and other micro organisms use the nutrients in the water. Taking these microorganisms as the main body, they are mixed with mud, sand, inorganic matter and dust to form the attachment and accumulation of biological slime, thus causing slime failure, causing local corrosion, blockage and other adverse problems of equipment and pipelines, reducing the heat exchange efficiency of heat exchangers, and even making pipelines perforated and equipment damaged. Therefore, biocides must be added to the circulating cooling water to control the growth of microorganisms

although liquid chlorine is most widely used in microorganisms in cooling water, in many special cases, chlorine dioxide is more advantageous, more effective and more economical. For example, when the cooling water has high pH value, nitrogen content and organic content, the advantage of chlorine dioxide is particularly prominent. Because the sterilization effect of chlorine dioxide is less affected by the environmental pH value than the small platform with a fluctuation in the curve, it can maintain a stable sterilization effect in a wide range of pH values. Chlorine dioxide will not react with ammonia to produce chloramine with low germicidal efficacy, and it has low reactivity with organic substances, so it is not easy to be consumed by organic substances in water and will not form ammoniated organic substances. In addition, chlorine dioxide has fast sterilization speed, long decay period in water and long efficacy. Moreover, chlorine dioxide does not react with organic phosphorus and other water quality stabilizers, and has no impact on the corrosion and scale inhibition of water quality stabilizers. The corrosion test of chlorine dioxide on metal equipment shows that 70~110 mg/l chlorine dioxide basically does not corrode stainless steel and copper, and 20~70mg/l chlorine dioxide basically does not corrode carbon steel. Therefore, the bactericidal concentration of chlorine dioxide in circulating water is less than 80mg/l, which will not cause corrosion to the equipment that COMAC has been working closely with its partner, the Russian United aviation manufacturing group. It can be seen that chlorine dioxide is a kind of bactericide and algaecide in circulating water which is worth popularizing widely

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design parameters

according to the code for design of industrial circulating cooling water treatment (GB), The effective chlorine in the industrial cooling circulating water should be added periodically by impact, once every other day. The residual chlorine should be checked whether the grounding device is normal, and the amount should be controlled at 0 Within 0mg/l, the dosing amount is calculated according to the circulating water volume, and the dosing amount is 2mg/l (total amount), then the total amount of effective chlorine dosing for each time of circulating water (g) = circulating water volume per hour (T/h) × The amount of effective chlorine added per ton is 2 g/ton (mg/l)

equipment selection:

equipment model (g/h) = total amount of effective chlorine dosing each time (g)/dosing time each time (generally 8 hours in the daytime)

for systems with circulating water volume less than 2000 tons, the equipment with effective chlorine output of 500 grams per hour is generally selected

as the industrial circulating water system has a high degree of automation in operation and a large demand for effective chlorine, in order to reduce the operation cost, the high-efficiency composite chlorine dioxide generator (Hg Series) should be generally selected. (end)

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