Co-gasification of digestate and lignite in a downdraft fixed bed gasifier: Effect of temperature

被引：31
|
作者：
Chang, Shengqiang [1 ,2 ]
Zhang, Zhikai [1 ]
Cao, Lixia [1 ]
Ma, Liqiang [2 ]
You, Siming [3 ]
Li, Wangliang [1 ]
机构：
[1] Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, 1 Zhongguancun, Beijing 100190, Peoples R China
[2] China Univ Min & Technol Beijing, Sch Chem & Environm Engn, Beijing 100083, Peoples R China
[3] Univ Glasgow, James Watt Sch Engn, Div Syst Power & Energy, Glasgow G12 8QQ, Lanark, Scotland
来源：
ENERGY CONVERSION AND MANAGEMENT | 2020年 / 213卷
基金：
中国国家自然科学基金;
关键词：
Co-gasification; Lignite; Digestate; Downdraft fixed bed gasifier; Biochar; CHAR STRUCTURE; SEWAGE-SLUDGE; ANAEROBIC-DIGESTION; PYROLYSIS INFLUENCE; BIOMASS; BEHAVIOR; WASTE; STEAM; COMBUSTION; ADSORPTION;
D O I：
10.1016/j.enconman.2020.112798
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
To improve energy efficiency and biomass utilization in the process of anaerobic digestion, co-gasification is considered as an effective method to post-treat anaerobic digestion residues. In this work, the effect of temperature (650 degrees C, 750 degrees C, 850 degrees C and 950 degrees C) on the co-gasification of digestate and lignite was thoroughly investigated in a downdraft fixed bed gasifier. The results showed that the increase of gasification temperature increased the gas yield and the lower heating value (LHV) of product gas. Physicochemical properties of biochar were characterized by physical adsorption analyzer, Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy and thermogravimetric analyzer (TG). It was shown that the average pore diameter increased in the range of 650 degrees C to 950 degrees C, while specific surface area and pore volume first increased from 650 degrees C to 850 degrees C and then decreased at 950 degrees C. The Raman analysis of biochar indicated that small aromatic rings condensed to large aromatic ring and increased the content of C-aromatic-C-alkyl and the crosslinking density at higher temperature. The variation of biochar properties at the higher temperature caused a decrease in the gasification reactivity. With the increase of temperature, the content of carbolic oil in the tar increased, but the contents of light oil, naphthalene oil and washing oil decreased. This study comprehensively analyzed the products properties and demonstrated the feasibility of co-gasification of digestate and lignite.
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页数：10
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