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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℃)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℃)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SiO2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。
Taking straw as the main research object and chlorine-containing biomass as control, the pyrolysis mechanism of inorganic chlorine in biomass was explored through tube furnace, combined thermal-infrared and theoretical calculations. The tube furnace pyrolysis test showed that KCl in straw and mold can react with active groups to precipitate HCl at low temperature (200-600 ℃). The ash composition may catalyze the chlorine precipitation at low temperature. Chlorides in compounds are mainly precipitated as gaseous alkali chlorides in high temperature regions (> 600 ° C). The results of TG-FTIR showed that there was a direct correlation between the devolatilization of rice straw and the precipitation of HCl. The Cl was HCl precipitated at the lower temperature in the pyrolysis of rice straw furnace. At high temperature, There was no significant chemical reaction between the ashes and SiO2. The theoretical calculation shows that Cl in biomass is in the form of alkali metal chloride; alkali metal chloride enters the vapor phase mainly in the vapor state under high temperature (> 700 ℃); the reaction of alkali metal chloride with SiO2 proceeds at high temperature 800 ~ 900 ℃) can be carried out.