摘要
对流向变换催化燃烧器的运行特性进行了数值模拟研究.选取热波移动距离作为比较的基准参数,研究了热波移动对燃烧器运行规律和熄火极限的影响.结果表明:当入口气速不同但热波移动距离相同时,在相同的入口反应物浓度下,燃烧器内温度分布基本相似,入口气速越高,燃烧器内高温区越窄但最高温度升高;随着热波移动距离的增大,维持反应器自热运行所需的最低入口反应物浓度升高且增幅逐渐增大;采用高密度的惰性床料替换部分催化剂有利于降低熄火浓度,当惰性段装填比例约为20％～40％时,熄火浓度为570～710 mg/m3;随着惰性段装填比例的增大,相同操作条件下热波移动距离逐渐减小.
Numerical simulations were carried out to operation characteristics of a reverse flow catalytic reactor,during which the effects of heat wave movement on both performance and extinction limit of the reactor were studied by taking heat wave creeping range as the reference parameters.Results show that for a constant heat wave creeping range and inlet methane concentration,but at different inlet gas velocities,the temperature distributions inside the reactor are essentially similar;the higher the inlet gas velocity is,the narrower the temperature plateau and the higher the maximum temperature will be.The minimum methane concentration required to maintain auto-thermal operation of the reactor grows with the rise of heat wave creeping range,and the growth rate increases gradually.The extinction limit may be lowed by substituting part of the catalyst section with inert packing,and the minimum methane concentration will be about 570-710mg/m3 when the inert portion accounts for 20 to 40percent.Under same working conditions,the heat wave creeping range tends to reduce with the rise of inert portion.
出处
《动力工程学报》
CAS
CSCD
北大核心
2014年第7期576-581,588,共7页
Journal of Chinese Society of Power Engineering
基金
宁波市自然科学基金资助项目(2013A610050)
宁波大学学科项目(XKL11D2091)
宁波大学人才工程项目(人才引进)
关键词
流向变换催化燃烧器
热波
低热值气体
熄火极限
数值模拟
reverse flow catalytic reactor
heat wave
low heating value gas
extinction limit
numerical simulation
