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Coking behavior of coal hydroliquefaction residue andits application in coal blending for coking

2021 No. 04
428
242
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Authors:
CHEN Zhihui
WU Youqing
WU Shiyong
HUANG Sheng
CHEN Dabo
SUN Shuo
GU Jiale
Unit:
Department of Energy Chemical Engineering,East China University of Science & Technology;Hangzhou NiuMo Technology Co.,Ltd.,
Abstract:

In this paper,direct coal liquefaction residue(DCLR)obtained by mild hydroliquefaction(430 ℃)and carbonization process(410 ℃)of Hongliulin(HLL)coal was blended with other five coals to prepare crucible coke under the laboratory conditions,which was beneficial to alleviate the shortage of high quality coking coal,reduce the cost of coking,and make the utilization use of coal resources. The adhesion index of raw coal was studied,crucible cokes were prepared by using coal samples with different proportions,and the coke yield,cold strength and thermal strength of cokes were analyzed. In addition,the mechanism of DCLR addition in coal blending system was proposed. The results show that adding 5% and 10% DCLR into coal blending system can replace 12% and 18% high caking property coals respectively with coke quality promised. When the DCLR ratio increases from 5% to 10%,the crushing strength increases about 1.20%,the abrasive resistance decreases about 1.04%,the coke reactivity index increases about 3% and the coke strength after reaction increases about 2%. In addition,the addition amount of DCLR should not be too high(<15%),because the high activity and high content of inert component of DCLR may lead to a decrease in the caking property of coal blends. The optimal preparation conditions of DCLR are as follows:liquefaction temperature 430 ℃,carbonization temperature 410 ℃,1% basic iron oxide catalyst. The G index of DCLR is 68,and the adhesion is strong. Thus DCLR is suitable to be used as additive and binder for coal blending and coking. DCLR and QM can partly replace FM by interacting with each other,increase the fluidity of the metaplast,and broaden the melting temperature range of coal blending. A large amounts of gas in the system wallopes the colloidal layer,and squeezes metaplast into the pores of coal particles,so as to obtain high strength coke. In the early stage of coking,the interactions between DCLR and QM have a certain influence on the key process of coking,and increase the degree of anisotropy of coke.

Keywords:
integrated mild-liquefaction and carbonization
coal blending for coking
cold strength
thermal strength
Citation format:
陈智辉(1993—),男,江苏无锡人,博士研究生,从事煤液化残渣配煤炼焦相关技术研究。E-mail:chenzhihuihappily@163.com。
通讯作者:吴幼青,教授,博士生导师,从事煤炭直接液化、生物质气化研究。E-mail:wyq@ecust.edu.cn;吴诗勇,教授,博士生导师,从事煤炭清洁利用、生物质液化气化研究。E-mail:wsy@ecust.edu.cn
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