1 000MW燃煤机组湿烟囱防腐方案

我国燃煤电厂烟气中的SO2排放控制主要采用湿法脱硫技术，脱硫后的烟气中仍含有少量的SO2和大部分SO3，不设烟气再热器（gas-gas heater，GGH）时烟囱内烟气湿度大，属于湿烟囱，应按强腐蚀性等级考虑。从防腐角度来看，烟囱结构形式的首选方案是多管式烟囱。通过对圆筒、方筒和塔架3种烟囱外筒形式的比较，得出采用普通圆形钢筋混凝土外筒最优的结论。通过对钛钢复合板内筒、玻璃钢内筒、镍基合金内衬和宾高德防腐玻璃砖内衬钢内筒这几种湿烟囱防腐方案的对比分析，优先推荐玻璃钢内筒作为1 000MW燃煤机组湿烟囱防腐方案。

Anti-Corrosion Schemes for Wet Chimney for 1 000 MW Coal-Fired Units

Wet FGD is the main technology used for the SO2 emissions control in coal-fired power plants in China, but there is still SO3 in flue gas after desulfurization, as well as a little SO2. Without gas-gas heater （GGH）, the flue gas humidity in chimney is high, so it belongs to wet chimney, whose corrosion grad is strong, and preferred structure scheme is multi-flue chimney. Through the comparison of outer tube forms of chimneys： cylinder, square tube and tower, it shows that the reinforced concrete cylinder is the most suitable to the outer tube of chimney. After comparing four wet anti- corrosion schemes of inner tube of wet chimney including titanium steel composite plate, FRP, nickel-base alloy and Pennguard anti-corrosion glass block, the FRP inner tube is recommended as an ideal anti-corrosion scheme for wet chimney in 1 000 MW coal-fired units.