燃料化学学报2020，Vol.48Issue(8)：897-907,11.
采用焦分离方法研究共热解时煤与生物质的相互作用及对焦结构和CO2气化反应性的影响
Investigation of coal-biomass interaction during co-pyrolysis by char separation and its effect on coal char structure and gasification reactivity with CO2
摘要
Abstract
The interaction between coal and biomass has been widely investigated. However, the mechanism is always proposed based on physicochemical structure and reactivity of char mixture. In this work, char mixture after co-pyrolysis of anthracite and biomass was separated based on different shape and size, and then structure and reactivity of the coal char were analyzed to reveal mechanism of coal-biomass interaction. Anthracite char samples with different corn straw ( CS) blending ratios were prepared by pyrolysis in a fixed bed reactor at 600 and 900 ℃. The AAEM concentration and microcrystalline structures of coal char were examined by inductively coupled plasma-optical emission spectrometry ( ICP-OES ) system and X-ray diffraction ( XRD ) . The gasification reactivity of char sample after separation was analyzed by TGA under CO2 . The results show that concentration of active K and Mg in coal char samples gradually increased and more disordered carbon structure formed as the CS proportion in the blending increased from 0 to 80％. The coal char in the blending captured more AAEM species by volatile-char interactions instead of escaping with volatile from biomass during co-pyrolysis process. Meanwhile, higher pyrolysis temperature led to volatilization and inactivation of K and Na, and also decrease in graphitization degree. Moreover, both addition of CS and low pyrolysis temperature could promote gasification reactivity of coal char sample. Furthermore, a satisfactory linear correlation (R2=0. 9009) between alkali index AI and R0. 5 of the char samples was established. This indicated that AAEMs performed the dominate effect to enhance gasification reactivity of coal char during co-gasification of coal and biomass.关键词
煤与生物质的相互作用/焦分离/共热解/气化反应性/碱性指数Key words
coal-biomass interaction/char separation/co-pyrolysis/gasification reactivity/alkali index分类
化学化工引用本文复制引用
李晓明,张红,刘梦杰,智丽飞,白进,白宗庆,李文..采用焦分离方法研究共热解时煤与生物质的相互作用及对焦结构和CO2气化反应性的影响[J].燃料化学学报,2020,48(8):897-907,11.基金项目
The project was supported by Natural Science Foundation of Shanxi Province (201801D121050), Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province (2017006), Shanxi Scholarship Council of China (2017-086), and Natural Science Foundation of China and Xinjiang Province (U1703252). （201801D121050）
