在有H_2S的情况下天然气催化燃烧Ⅲ型炉特性研究

Reaseach on Characteristics of Catalytic Combustion Burner Ⅲ of Natural Gas in the Present of H_2S

研究了影响催化剂寿命的因素.在常压和温度升到1 150 K范围内的滞止点流动反应器中,在有H2S的情况下,对CH4在镀氧化铝和氧化铈-氧化铝的铂催化剂上的转化率进行实验和模拟.在实验中将浓度为30-100 ppm的H2S气体掺入到N2稀释过的CH4/空气反应物流中后,明显地促进了甲烷的燃烧速率.在催化燃烧Ⅲ型炉中进行了1 100小时的寿命实验.通过测量催化燃烧炉的燃烧表面温度、通道温度和烟气含量等参数,探讨了催化剂的老化后所引起的燃烧表面温度、通道温度的变化情况,并分析了产生的原因.这将有助于改善催化燃烧炉的实际操作条件,延长催化剂的使用寿命.

The factors that affect the lifetime of catalyst are studied in the paper.The CH4 conversion efficiency over alumina and ceria-alumina supported platinum catalysts in the present of H2S was investigated experimentally and simulated in a stagnation point flow reactor at atmospheric pressure and at temperature up to 1 150 K.Doping the N2-diluted CH4/air reactant flow with H2S concentrations between 30 and 100 ppm had a significant promotional effect on the methane combustion rate.For the lifetime of catalyst about catalytic combustion burner Ⅲ 1 100 hours were obtained.The local surface temperatures of monolith,the gas temperature inside channels and pollutant concentrations were measured.The ageing of catalyst to the change of local surface temperatures and gas temperature was approached and its affecting factors were analyzed.This will improve the working conditions of catalytic combustion burner in future,and prolong its lifetime of catalyst.