Abstract:Under the more and more strict environmental protection requirement, power plants are stepping forward on the flue gas environmental facilities reconstruction. Completely remove bypass flue, forward lead or remove gasgas heater or add wet electrical static precipitator, any kind of these reconstructions will change the stack operating condition. By combined theoretical analyzing and lab test, stack operating condition under the new circumstance was analyzed. Authors indicated that even though the stack operating condition is getting batter, the corrosion condition is still very serious. Stack anticorrosion is still very important. A few kinds of problematic stack anticorrosion technologies were analyzed. Suggestions for stack anticorrosion reconstruction design, material selection and construction implementation under the new circumstance were provided.

Keywords:thermal power plant, desulfurization, stack, anti corrosion, gas gas heater