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在一维恒温沉降炉上,采用1200℃的再燃温度对木屑、秸秆、稻壳3种生物质再燃区烟气中的主要成分随过量空气系数的变化规律进行了研究.结果表明:再燃脱硝效率及CxHy、CO的浓度随过量空气系数的增大而降低,NH3、HCN的浓度也呈明显的降低趋势;在相同的过量空气系数条件下,木屑的脱硝效率最高,其次是秸秆,稻壳最低;木屑再燃区的CxHy和CO浓度最高,氧浓度最低,表明其再燃区还原性气氛强于其他2种生物质;木屑再燃烟气中的NH3、HCN浓度明显高于秸秆和稻壳.对3种生物质再燃烟气中的TFN进行了计算,得出由于NH3、HCN在燃尽区氧化导致总脱硝效率降幅较小的结论.
In the one-dimensional constant temperature sedimentation furnace, the change law of the main components in the flue gas with burnt wood, straw and rice husk with excess air coefficient was studied with the reburning temperature of 1200 ℃. The results showed that the reburning efficiency And CxHy. The concentration of CO decreased with the increase of excess air ratio, and the concentrations of NH3 and HCN also decreased obviously. Under the same excess air ratio, the efficiency of denitrification was the highest, followed by straw and rice husk ; The concentration of CxHy and CO in the sawdust reburning zone is the highest and the oxygen concentration is the lowest, indicating that the reducing atmosphere in the reburning zone is stronger than the other two kinds of biomass; the concentration of NH3 and HCN in the reburning flue gas is obviously higher than that of straw and rice husk. The calculation of TFN in biomass reburning flue gas shows that the decrease of total denitrification efficiency is small due to oxidation of NH3 and HCN in the burnout zone.