煤的模型化合物热解过程中HCN、NH_3的逸出规律

The Law of HCN and NH_3 Escape during the Pyrolysis of Model Compounds of Coal

为了解煤燃烧过程中NOx 的生成机理 ,在 6 0 0～14 0 0℃温度范围内 ,选取吡啶、吡咯为煤的含氮模型化合物 ,采取傅立叶红外光谱仪 (Ft-Ir)和分光光度计连用方式 ,在等温连续式流动反应器中实验研究了模型化合物热解过程中HCN、NH3 的逸出规律。结果表明 :HCN是模型化合物的热解产物中的主要含氮产物 ;吡啶、吡咯的HCN的转换率都随着温度的升高而增大 ;同温度下 ,吡咯的HCN生成率高于吡啶的HCN生成率 ,吡咯的NH3 生成率高于吡啶的NH3生成率。

To understand the formation mechanism of NO_ x during a combustion process, tests were conducted over the temperature range of 873-1 673 K by selecting pyridine and pyrrole as nitrogen-containing model compounds. With the combined use of a Fourier transform infrared spectrometer (Ft-Ir) and a spectrophotometer the law of HCN and NH_3 escape during the pyrolysis of model compounds was experimentally investigated in an isothermal continuous-flow reactor. The investigation results indicate that HCN is the main nitrogen-containing product in the pyrolysis products of model compounds. The conversion rate of pyridine and pyrrole will increase with a rise in temperature. Under a same temperature the HCN formation rate of pyrrole is higher than that of pyridine and the NH_3 formation rate of pyrrole is higher than that of pyridine.