What methods of cleaning the closed cooling tower?

Because most cooling water containing calcium and magnesium ions and bicarbonate. When the cooling water flowing through the metal surface, the formation of carbonate. In addition, the dissolved oxygen in water will cause metal corrosion, the formation of rust. Due to rust scale, closed cooling tower heat transfer effect. Serious when have to spray cooling water outside shell, serious scaling blocking pipe, make the heat transfer effect. Research data show that scale deposits on the heat transfer loss has had a huge impact, with the increase of sediment will cause the increase of energy costs. Even a very thin layer of scale will increase the scaling part of the equipment more than 40% of the operating cost. Keep the cooling channels do not contain mineral deposits can well improve efficiency, save energy and prolong the service life of equipment, saving production time and cost at the same time. Has long been the traditional cleaning method such as mechanical method ( Shave, brush) And high pressure water, chemical cleaning, Pickling) A lot of problems in the equipment when cleaning, such as: cannot remove scale and other sediments, acid corrosion on equipment form loopholes, residual acid to secondary material corrosion or corrosion under the scale, * eventually lead to replacement of equipment, in addition, the cleaning liquid is toxic, need a lot of money for wastewater treatment. According to the above situation, working on cleaning agent for metal corrosive small, both at home and abroad and the research and development success blessed teck detergent. It has the characteristics of high efficiency, environmental protection, safety, no corrosion, not only cleaning effect is good and no corrosion to equipment, and can make the long-term use of closed cooling tower. Closed cooling tower material generally is given priority to with carbon steel, stainless steel and copper, carbon steel material of the tube plate when used as a closed cooling tower, the tube plate and the column tube weld corrosion leakage often occurs, the leakage into the cooling water system will result in environmental pollution and waste of materials. Closed cooling tower, which of the tubesheet and shell and tube welding general use manual arc welding, weld shape defects of different level, such as depression, porosity, slag, weld stress distribution is not uniform. When using tube plate parts contact with industrial cooling water, and the impurities in the industrial cooling water, salt, gas, microbes can constitute the corrosion of tube plate and weld. Studies have shown that both fresh water and sea water, industrial water will have all kinds of ions and dissolved oxygen, especially the change of chloride ions and oxygen concentration, play an important role on the corrosion of the metal shape. In addition, the complexity of the metal structure will also affect the corrosion morphology. For closed cooling tower anticorrosive problem, traditional methods is given priority to with repair welding, but internal stress is generated in repair welding is easy to make the tube plate is difficult to eliminate, may cause leakage of cooling tower tubesheet weld again. The current western countries adopt the method of polymer composite materials to protect the cleaning and maintenance of closed cooling tower.

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