Mechanism Study of Chlorine Release During Biomass Pyrolysis

以稻草为主要研究对象，以含氯生物质模化物为对照，通过管式炉、热重红外联用以及理论计算，对生物质中无机氯的热解析出机制进行探索。管式炉热解试验表明：低温下（200～600℃1稻草和模化物中的KCl可以与活性基团反应而析出HCl；灰成分对低温条件下氯析出的过程可能有催化促进作用；模化物中的氯在高温区（〉600℃1主要以气态碱金属氯化物形式析出。TG．FTIR试验表明：稻草热解脱挥发分过程与HCl的析出之间存在直接的关联；管式炉稻草热解过程在较低温度条件下析出的cl是HCl；在高温区，碱金属氯化物和灰成分Si02之间未发生显著的化学反应。理论计算表明：生物质中的Cl是以碱金属氯化物形式存在的；碱金属氯化物在高温下（〉700℃）主要以蒸汽态进入气相；碱金属氯化物与SiO2的反应在高温下（800-900℃）可以进行。

Biomass, especially herbaceous biomass mostly contains a certain quantity of inorganic impurity such as K and C1, which would cause precipitation, erosion and contamination in the process of thermal utilization. Therefore, the existing form and releasing rule of Clbecomes an important subject. Researchers have found that a great amount of Cl will release when the transmission of Cl in biomass pyrolysis is studied at a low temperature.