文献类型：期刊文献

英文题名：Evolution and mechanism of a new index liquid-gas ratio (LGR) in coking of coal blending

作者：Chen, Zhihui[1];Wu, Youqing[1,2];Huang, Sheng[1,2];Wu, Shiyong[1,2];Gao, Jinsheng[1,2]

机构：[1]East China Univ Sci & Technol, Dept Chem Engn Energy Resources, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Coal Gasificat Engn Technol Res Ctr, Shanghai 200237, Peoples R China

年份：2021

卷号：158

外文期刊名：JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS

收录：;EI(收录号：20213010666261);WOS:【SCI-EXPANDED(收录号:WOS:000687221600007)】；

基金：This work was supported by the National Natural Science Foundation of China (Grant Nos. 21878096, 2197080732 and 201506060) , the National Key Basic Research and Development Program of China (Grant No. 2018YFB0604602) , and the Fundamental Research Funds for the Central Universities (Grant No. 222201718003) .

语种：英文

外文关键词：Coke strength; LGR; Caking index; Thickness of colloidal matter layer; Thermogravimetric analysis; LGR(t)

摘要：Direct coal liquefaction residue (DCLR) was blended with five bituminous coals to prepare crucible coke in the laboratory. A new index liquid-gas ratio (LGR) was defined to quantify relative amounts of liquid phase and gas phase during coking. Great attention was paid to the early stage of coking (400-600 degrees C) and then LGR was modified to LGR(t). Relationships and mechanism between LGR, LGR(t) and coke strength were investigated and summarized. Results showed that when high caking property coal ratios was inadequate (< 60 %), the higher LGR was, the larger coke strength was. When high caking property coal ratios was over 60 %, LGR was over 37 mm and coke strength could be guaranteed. Besides, polynomial fitting results of LGR and CSR* showed that coke strength increased sharply and then decreased slightly when LGR increased from 20 to 40 mm. The optimal LGR of coal blends was 37 mm and rational LGR range was from 33 to 40 mm. It was also found that LGR(t) needed to be at least 90 mm at the peak temperature during the early stage of coking. In addition, DCLR ratio in blending system needed to be controlled within 5%. Otherwise, the content of gas was inadequate enough to squeeze large amounts of metaplast into holes at the temperature range 400-430 degrees C. Finally, it was concluded that high quality coke could be obtained with two requirements: high caking property coal ratios was abundant (> 60 %) and the content of gas druing coking matched the content of metaplast (rational LGR and LGR(t)).