典型生物质热解过程中碱(土)金属转化特性

Transforming Characteristics of Alkali and Alkaline Earth Metallic Species during Isothermal Pyrolysis of Typical Biomass

通过进行鄱阳湖典型水生植物管式炉热解试验,联用便携红外分析仪、煤气分析仪和电感耦合等离子体发射光谱仪,分析了恒温热解焦中碱(土)金属的含量及其在热解过程中转化规律。结果表明:凤眼莲对生活污水中的碱(土)金属有一定的吸附作用;水生植物的恒温热解过程主要为一次反应,CO、CO2和CH4的体积分数达到最大的时间在60 s左右,而H2在100 s左右。水生植物热解过程中,Na的析出率最高,其次是K,然后是Ca和Mg;凤眼莲中K主要以无机盐形式存在,在热解反应后期以无机盐分解挥发析出,析出率最高达75%左右。

Based on the isothermal pyrolysis experiments of typical aquatic plants in PoYang Lake with tube furnace, the content and the transforming rule of alkali and alkaline earth metallic species （AAEMs） of isothermal pyrolysis chars were studied and analyzed with the portable infrared analyzer, gas analyzer and ICP-AES. The results showed that eichhornia crassipes could absorb some AAEMs in domestic sewage, aquatic plant isothermal pyrolysis process was mainly a first-order reaction, and it was about at 60 s when the volume fraction of CO, CO2 and CH4 a- chieve the maximum but H2 within 100 s. During aquatic plants pyrolysis, Na precipitation rate was the highest, K second, Ca and Mg least. K mainly exists with inorganic salt formation in eichhornia crassipes, and precipitates with inorganic salt formation in the pyrolysis reaction later stage, and the highest releasing percentage reached about 75%.