Fe_2O_3和K_2CO_3对钙基添加剂脱硫脱硝的影响

在研究焦炭燃烧过程中使用钙基添加剂固硫的基础上,探讨了Fe_2O_3或K_2CO_3对CaO脱硫脱硝的影响。实验结果表明:添加剂的种类对焦炭燃烧过程中排放的SO_2和NO的浓度及总量均有一定的影响;加入Fe_2O_3或K_2CO_3替代部分CaO后,焦炭燃烧过程中排放的SO_2和NO比单独加入CaO时均有所下降;向焦炭中分别混合3.0%(w)CaO),1.5%(w)CaO+1.5%(w)Fe_2O_3,1.5%(w)CaO+1.5%(w)K_2CO_3的添加剂时,焦炭的SO_2排放总量分别降低了69.93%,75.98%,79.98%,NO排放总量分别降低了64.38%,79.73%,84.14%;加入Fe_2O_3或K_2CO_3后,钙基添加剂的表面性质发生了变化,同时增加了反应的活性中心数,因而复合添加剂能更有效地进行脱硫脱硝。

Effects of Fe2O3 and K2CO3 on Desulfurization and Denitrification by Calcium-Based Additives

Based on researches of sulfur fixation with calcium-based additives in coke combustion process,the effects of Fe₂O₃ and K₂CO₃ on desulfurization and denitrification by CaO were investigated. The experimental results show that：The concentration and total amount of SO₂ and NO emitted in coke combustion process can be affected by the type of additives;After CaO is partly replaced with Fe₂O₃ and K₂CO₃,SO₂ and NO emitted in coke combustion process is declined than that by only CaO;When the coke is mixed with the additives of 3%（w）CaO,1.5%（w）CaO+1.5%（w）Fe₂O₃,1.5%（w）CaO+1.5%（w）K₂CO₃,the total emission amount of SO₂ is reduced by 69.93%,75.98%,79.98%,and that of NO is decreased by 64.38%,79.73%,84.14%,respectively;With the addition of Fe₂O₃ or K₂CO₃,the surface properties of calcium-based additive are changed and the number of active center is increased,therefore the complex additive can improve desulfurization and denitrification effectively.