Citation: LI Xiao-ming, ZHANG Hong, LIU Meng-jie, ZHI Li-fei, BAI Jin, BAI Zong-qing, LI Wen. Investigation of coal-biomass interaction during co-pyrolysis by char separation and its effect on coal char structure and gasification reactivity with CO₂[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(8): 897-907. shu

Investigation of coal-biomass interaction during co-pyrolysis by char separation and its effect on coal char structure and gasification reactivity with CO₂

LI Xiao-ming ¹ ,
ZHANG Hong ¹ ,
LIU Meng-jie ^2,3 ,
ZHI Li-fei ¹ ,
BAI Jin ^2,, ,
BAI Zong-qing ² ,
LI Wen ²

1.
School of Chemical and Biological Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China
2.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: BAI Jin, stone@sxicc.ac.cn
Received Date: 2 June 2020
Revised Date: 28 July 2020

Fund Project: Natural Science Foundation of China and Xinjiang Province U1703252Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province 2017006Natural Science Foundation of Shanxi Province 201801D121050The 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)Shanxi Scholarship Council of China 2017-086

Figures(7)

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 R_0.5 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.
- coal-biomass interaction,
- char separation,
- co-pyrolysis,
- gasification reactivity,
- alkali index
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沈阳化工大学材料科学与工程学院沈阳 110142

Investigation of coal-biomass interaction during co-pyrolysis by char separation and its effect on coal char structure and gasification reactivity with CO2

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通讯作者: 陈斌, bchen63@163.com

Investigation of coal-biomass interaction during co-pyrolysis by char separation and its effect on coal char structure and gasification reactivity with CO₂