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When the airway transports general gas, the black steel plate air duct should be derusted and brushed with anti-rust paint. The dust-proof gas can be sprayed with anti-wear protection layer. When the ambient air humidity is large, the outer wall of the air duct needs to be prevented. Corrosion, anti-rust treatment. For the inner wall of the galvanized steel sheet conveying high temperature and high humidity gas, it is advisable to spray phosphating primer or other corrosion resistant coating. When the high temperature gas or low temperature air is transported in the air duct, the outer wall of the air duct shall be treated with heat preservation (cooling).
The purpose of heat preservation of the high-temperature gas duct is to prevent the heat loss of the air in the pipeline (appearing in the centralized air-conditioning system in winter); and to prevent the heat from being emitted into the room when the waste steam or high-temperature gas is transported, so that the room temperature rises. It can also prevent people from being exposed to the air duct and being burnt. In the summer, when the temperature of the conveying gas is lower than the air dew point temperature of the surrounding environment, condensation will occur on the outer wall of the pipe. This will increase the loss of cooling capacity in the air duct of the centralized air conditioning system, and the condensation of water droplets will pollute the ceiling and the wall, so it should also be insulated and insulated.
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