Chilled water is a circulating water that flows to the cooling process only after its temperature has dropped through the refrigerator, and is mainly used in systems requiring low-temperature cooling in central air conditioners and factories. The composition of the cooling system, the frozen water is closed and non-closed, non-closed and divided into some open and spray two types. Most of the central air-conditioning chilled water systems are closed-type; most of the chilled water systems in the factory are open-type; chilled water systems with sprinklers are mainly found in places where air washing and air humidity control are required such as textile mills, electronic components manufacturing Workshop and so on. Chilled water cooling water temperature is very suitable for the growth of bacteria and algae, growing algae will form biological slime, in the pipeline to generate heterogenous oxygen bacteria, iron bacteria, nitrifying bacteria, bacteria such as sulfate reduction bacteria in large numbers, resulting in pipe Corrosion of the inner wall, resulting in rust skin off, affecting the condenser heat transfer; circulating cooling water will grow Legionella bacteria cause harm to human health. Circulating water in the calcium and magnesium ions with the condenser heat exchanger when the water temperature generated scale, attached to the inner wall of the condenser copper tube, the formation of dense scale (mainly calcium carbonate scale). Scale and dirt are often combined together, scaling and sticky mud can cause or aggravate the corrosion, seriously affecting the heat transfer. Therefore, cooling the main task of circulating water treatment is to eliminate or reduce the scale, corrosion and biological sludge damage. Compared with the cooling water has the following characteristics: In general, the amount of water storage and circulating water to be smaller. Water temperature is relatively low, usually 1 ℃ to 20 ℃ between the changes, most of 6 ℃ ~ 12 ℃ between. Concentration times remain unchanged. Closed chilled water system in the cycle, because it is not in contact with air, there is no evaporation, so the water is basically no loss. Part of the open chilled water system is only exposed to the air in the cold pool open part of the exchange between the quality of the air with little, can be ignored, so there is almost no water loss during the cycle. Chilled water system with spraying device has special hygroscopic phenomenon during the circulation in summer, that is, there is no loss of water during the circulation. Instead, the water in the air enters into the system to make the system have lower ion concentration than the make-up water. Due to the small change of ion concentration, it can be considered that the concentration ratio remains basically unchanged. In the winter due to humidification of the air from the role, there is a certain concentration of frozen water. Water treatment agents for a one-time investment, in order to ensure the effectiveness of agents in a specific cycle of sewage dressing. Chilled water on the equipment is the main cause of corrosion damage, often due to corrosion and red water. Ferrous hydroxide easily oxidized to red-brown rust, which is the main reason for the occurrence of red water chilled water. In open and sprinkler systems, the dissolved oxygen content of the system is adequate due to partial exposure of the system to air or direct contact with air; in closed chilled water systems, dissolved oxygen rapidly dissipates due to corrosion , Not enough. Water treatment agent classification can be divided into corrosion inhibitor corrosion inhibitor, organic corrosion inhibitor, polymer corrosion inhibitor. Inorganic corrosion inhibitors mainly include chromates, nitrites, silicates, molybdates, tungstates, polyphosphates, zinc salts and the like. Organic corrosion inhibitors include phosphonic acid (salt), phosphonic acid, behenyl, and benzothiazole, sulfonated lignin and some other nitrogen compounds containing heterocyclic compounds. Polymer corrosion inhibitors include polyethylene, POCA, polyaspartic acid and some other oligomers of polymer chemicals. Scale inhibitor refers to a class of agents that can disperse insoluble inorganic salts in water, prevent or interfere with the precipitation and fouling of insoluble inorganic salts on the metal surface, and maintain the good heat transfer effect of metal equipment. Cold exchange equipment, antiseptic scale inhibitor to epoxy resin and specific amino resin as the base material, adding appropriate amount of various anti-rust, anti-corrosion additives formulated from a single component. It has excellent shielding, impermeability, rust resistance, good scale, thermal conductivity, excellent resistance to weak acid, alkali, organic solvents and other properties, its strong adhesion, and the film bright, pliable, dense, hard .
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