关键词: 生活垃圾, 催化剂, 高温再生, 脱硝效率

Abstract: A certain municipal solid waste incineration plant in Tianjin was taken as the research object， to explore the effect of catalysts offline high-temperature regeneration in municipal solid waste incineration by adopting the method of engineering experiment. The XRF tests on new and old catalysts before and after regeneration were carried out, and the durations and the changing trend of SO2 concentration in the circulating flue gas in each stage of heating up, holding and cooling down were summarized. The results showed that the main factors causing the deactivation of SCR low-temperature catalysts in municipal solid waste incineration project were the (NH4)2SO4 and NH4HSO4. Through performance test and analysis, it was found that after the old catalyst regenerated offline at high temperature, the flue gas pressure drop of the catalysts was reduced by 300 Pa, and the relative activity of the catalyst recovered by 72%, the offline regeneration process has achieved the expected effect. Taking four 750 t/d municipal solid waste incinerators as an example, through cost analysis, the adoption of the offline high-temperature regeneration process could save 4.03 million yuan in operating costs annually, indicating that the offline high-temperature regeneration process has high economic efficiency and high promotion value.

Key words: municipal solid waste, catalyst, high-temperature regeneration, denitration efficiency