Long-term corrosion protection of flue inner wall of high temperature and high corrosion chimney

The corrosion of low-temperature flue gas has always been a difficult problem in the anticorrosion of flue gas chimney pipes. There are generally four types of chimney flue: brick chimney, reinforced concrete chimney, insulation brick and steel plate chimney. The main function of chimney is to draw fire and smoke, exhaust flue gas and improve combustion conditions. Relevant persons of Dilin Heavy-duty Anticorrosive Coatings proposed that if there is low-temperature flue gas in the flue chimney, the water in the flue gas will condense, and the condensed water will absorb the acid-base medium of the flue gas and become the source of acid-base corrosion. The smoke anticorrosion coating on the inner wall of chimney flue can prevent condensation water from pitting corrosion, stress corrosion, chemical corrosion and potential corrosion. The coating also has high flexibility and thermal expansion resistance, which can resist the corrosion of vibration chimney in operation, although the steel chimney is reinforced; Since the national environmental protection department strictly controlled the operation rate of desulfurization devices in coal-fired power plants in early 2008, corrosion and leakage accidents of desulfurized chimneys in domestic coal-fired power plants have occurred frequently: (1) Some anti-corrosion chimneys are leaking only one week after the desulfurization device is put into operation; (2) A considerable part of desulfurized bacon has been put into operation for less than half a year, that is, serious leakage and steel corrosion have occurred: (3) What's more, after these leakage accidents, the general contractor for corrosion protection of these chimneys couldn't put forward any remedial measures. In addition, due to the power grid dispatching, the power plant couldn't find a time to stop for more than two months for these contractors to carry out the chimney corrosion protection project. This project has a long cycle, a large cost and the corrosion protection effect in high erosion areas is not very ideal. To sum up, at present, a large number of wet desulfurization bacon in China runs in a seriously corrosive environment with diseases, and there are a lot of difficult-to-control and difficult-to-handle security risks, which seriously endanger the safe operation of power plants. Anti-corrosion of high-temperature chimney flue: polish/sand-blast the chimney base and clean it → brush Dilin RC900 for rust conversion → brush Dilin 8050 heavy-duty anti-corrosion coating → check and repair → brush Dilin 8050 heavy-duty anti-corrosion coating → wait for 3 days to cure.