Denitration performance of catalytic filter bag and synergistic purification of waste incineration flue gas
Aiming at the technical idea of catalytic filter bag for synergistic purification of waste incineration flue gas deacidification,denitration and dedust,a synergistic purification experimental system was established.The effects of key factors on the denitration performance of catalytic filter bag were studied under the premise of waste incineration flue gas deacidification.Then the optimized parameters were selected to carry out the synergistic purification experiments.The results show that the denitration efficiency changes by about 15％ within the applicable temperature range of 180-220 ℃.The ammonia escape decreases by about 0.9 μL/L for every 10 ℃increase.At 150 ℃,both denitration efficiency and ammonia escape concentration deviate seriously from the demand value.With the increase of ammonia nitrogen ratio 0.1 mol/mol,flue gas moisture content 5％ ,inlet NOx concentration 100 mg/m3 and filtration velocity 0.1 m/min,the variation of denitration efficiency is about 4.1％ ,-2.6％ ,2.7％ and-1.7％ respectively,and the variation of ammonia escape concentration is about 1.9,0.5,2.3 and 0.6 μL/L respectively.In the synergistic purification experiments of deacidification and denitration,when the stoichiometric ratio of NaHCO3 to HC1+SO2 was 1.1 mol/mol,the removal efficiency of HC1 was basically stable at about 96％ ,and the removal efficiency of SO2 reached more than 97％ and increased slightly with the increase of NH3/NO.When the NH3/NO is above 1 mol/mol,the denitration efficiency can reach more than 70％ .For every 0.1 mol/mol increase in NH3/NO,the denitration efficiency increases by about 3.2％ ,and the ammonia escape concentration increases by about 3.1 μL/L.
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