Microbial growth is one of the three major problems that need to be addressed in cooling water systems.
Microorganisms are generally self-proliferating, multi-functional and small-volume large-area single-cell systems. Microorganisms are small in size, large in area, high in absorption, fast in transformation, prosperous in growth, fast in reproduction, easy to mutate, strong in adaptability, and diverse in variety and distribution. wide. Microorganisms are pervasive, but not all microorganisms in the cooling water can cause malfunctions. The microorganisms that often cause malfunctions are bacteria, fungi and algae. In particular, microbes that can produce slime, which cover the metal surface, not only reduce the cooling effect, prevent the water treatment agent from reaching the metal surface, but also cause scale corrosion. The form of microbial corrosion can be uniform corrosion, but also crevice corrosion and stress corrosion, but mainly pitting. The faults caused by microbial slime are roughly as follows:
1. The slime adheres to the metal surface of the heat exchange portion to reduce the cooling effect of the cooling water;
2. A large amount of slime will block the cooling water in the heat exchanger, so that the cooling water can not work, a small amount of slime will reduce the cross-sectional area of ​​the cooling water passage, thereby reducing the cooling water flow and cooling effect, increasing the pump pressure;
3. The slime accumulates on the surface of the cooling tower packing or between the packings, blocking the passage of the cooling water and reducing the cooling effect of the cooling tower;
4. The slime covers the metal surface in the heat exchanger, preventing the corrosion inhibitor and the scale inhibitor from reaching the metal surface to exert its corrosion inhibition and scale inhibition effect, preventing the fungicide from killing the microorganisms in the slime and the slime, and reducing the medicaments. Function
5. The slime covers the metal surface, forming a differentially corroded battery, causing corrosion of these metal equipment;
6. A large amount of slime, especially algae, is present on the equipment of the cooling water system, affecting the appearance of the cooling water system.
The control of microorganisms in the cooling water system is mainly achieved by controlling the amount of microorganisms in the cooling water. One of the most effective and most commonly used methods is the addition of fungicides.
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