Central air-conditioning water systems are operated with a large number of corrosive products such as water, sludge, rust and algae biomix, which are deposited on the copper tube surface of the heat exchanger, seriously affecting the cooling effect and operational life of the central air-conditioning system, and the treatment of central air-conditioning water is of practical and practical value in improving the cooling effect of the central air-conditioning system, saving energy, curbing equipment erosion and extending the service life of the aircraft。
I. Need and purpose of central air-conditioning water treatment
1. Because of the presence of calcium, magnesium and salt substances in water, air-conditioning water systems inevitably produce a variety of water glucose, because the heat coefficient of the water is 1. 1 per cent of carbon steel, and the heat coefficient of the oil glucose, algae and clay is only 0. 23 per cent of carbon steel. When air-conditioning water systems produce dirt, they worsen the heat transfer performance of the aircraft, increase exhaust pressure and reduce refrigeration efficiency, leading to waste of energy, increased operating and maintenance costs, and high-pressure break-up protection of the host when severe。
2. Sequestration results in a difference between the dissolved oxygen concentration in water and the oxygen concentration in the surface of the ground, resulting in the formation of a low oxygen concentration battery and continuous erosion of the ground metal. At the same time, microbial slime can corrosively corrosive to metals, with the result that the operation and maintenance costs of the system will be significantly increased, the useful life of the equipment will be reduced and the mainframe will be rendered obsolete earlier if it is serious。
According to the production of water from air-conditioning systems and the breakdown of oxygen corrosion, the cleaning and routine water quality treatment must be carried out on a regular basis. Safe and effective chemical cleaning can achieve safe and normal operations and significantly increase the efficiency of cooling or heating. The cost of running the cleaning system, electricity, oil and gas consumption have been significantly reduced. The preservative film protects the mainframe and the tube network from erosion, and from the production of water, thereby extending the operational life of the crew。
Ii. Machine munching methods
Physical cleansing: one type of washing method for the cleaning of circulatory water systems or their equipment by physical or mechanical means. Commonly used physical cleaning methods include the main piped cannon, i. E. By means of compressing air or hand-stamping tools, rubber plugs, nylon brushes or round steels, and by changing the heater tube to remove sediment or plugs from the tube。
2 chemical cleansing: a type of washing method that dissolves, defuses, drops or strips sediments from washing equipment through the use of chemical agents. Common methods of chemical cleansing include acid washing, alkaline washing, compost washing, fungicide cleansing, etc. Chemical cleaning is generally used to remove equipment, hard dirt within pipes and sediments at points of convergence。
Cleaning process for cooling water systems:
1. Cutting the cooling tower power, manual cleaning of the cooling towers, terrain, fillings, etc.
2- placing in towers a dedicated anti-algaeicide with a pump cycle of 16-24 hours for system-wide anti-algae control。
3. Placing in the towers a cleaning decomposer and pumping a pump for 16-24 hours, which can penetrate and wet into the interior of the stains, making it easier to remove the oily stains, which are taken with the flow of water, such as stains, water, rust, mud, etc., for the purposes of cleaning。
4. Release cooling water, clean cooling towers, remove y-type filters from cooling system rooms, and clean cooling water after cleaning the filtration net。
A pre-film agent is added to the cooling tower and the system is cleaned at the first two steps to prevent erosion of the metal surface. Control ph values between 5. 5 and 6. 5 and emissions after 24 hours of operation。
Day-to-day maintenance, pharmaceutical concentration, depending on the quality of the water, is determined by analytical surveillance to increase it to maintain and repair the protective film formed on the surface of the metal in the system for the purpose of preservation against corruption, preservation against dirt and control of the growth of microorganisms。
Refrigerated water system cleaning process:
1. Exterior pumps are fed from sewage vents with fungicides, pump cycle 16-24 hours for system-wide treatment of biofabricidal algae。
2. Exterior pumps are pumped with detergents from the sewage vent and pumped for 24 hours, stripping the system of rust and oil contamination。
3. Emissions of frozen water that removes the stains and sludge from the freezer system. Block filters for the head of the freezer room of the system, the removal of filters, the sealing of filters and the filling of exhausts of the system to the freezing water. Frozen pumps are recycled half an hour to one hour, and the pumps are drained system-wide, drained and injected, so repeatedly washed to clear and transparent water。
4. The external pumps are fed with pre-membracing fluids from the sewage vent, and after cleaning the system, the metal surface is in a very active state and is susceptible to secondary oxidation, so the system should be pre-membraced to prevent erosion of the metal surface. Add prefilm agents, control ph values between 5. 5 and 6. 5 and release after 24 hours of operation。
Emission of 2/3 of frozen water, injection of a cooling agent from the exterior pump from the drain vent, two hours of pump cycle, so that the drug is evenly distributed in the system. Test ph, ph normal at 8-10。
Wind-cooled mainframe cleaning: washing machine water guns to the water column, washing the parts of the wind-cooled mainframe once, using a specialized fin-cleaning agent to spray on the condenser wings, waiting for their reaction, before blowing a bubble and washing with a water gun, until there are no residues and drying。
Iii. Purge maintenance of end-of-pipe equipment
The end-of-pipe equipment consists mainly of wind hoses, wind cabinets, modular air processors, etc. The end-of-pipe equipment circulates indoor air over a long period of time, so that the dust, bacteria, etc. In the air gathers on inner parts such as aluminium wings, leaf wheels, etc. Obsolete pollution, such as fibres, accumulates and clogged, resulting in reduced wind volume of end-of-pipe equipment, which seriously affects central air-conditioning thermal exchange and cooling efficiency. It is also dark and damp inside the equipment, with a wide variety of pathogenic bacteria, even in the legions of the army, which causes serious air pollution and endangers human health。
