焦炭流化床燃烧条件下氧化亚氮生成途径的实验研究

Experimental study on nitrous oxide formation during char combustion at fluidized bed conditions

在小型电加热流化床实验台上对一种无烟煤焦炭燃烧过程中氧化亚氮生成途径进行了实验研究 ,实验结果表明 ,HCN的气相氧化反应和NO与焦炭表面多相反应均为N2 O的来源 .HCN的析出是焦炭脱挥发分的结果 ,制焦温度越高 ,HCN的生成机会越小 ,HCN的氧化反应在N2 O生成过程中作用越小 ,这时 ,NO和焦炭表面的多相反应主导着N2 O的生成 .

Nitrous oxide formation during char combustion was investigated at a batch scale electrically heated qartz tube fluidized bed reactor. Experimental results showed that HCN oxidation is a nitrous oxide formation path during char combustion. The reaction of NO with char particle surface also contributes to nitrous oxide formation. HCN is from char devolatilization during combustion. The role of HCN oxidation on nitrous oxide formation becomes slight when char prepare temperature increases, whereas the heterogeneous reaction of NO with particle surface becomes dominant for nitrous oxide formation.