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Analysis on the technology development status of coal-based needle coke in China

2022 No. 01
879
918
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Authors:
CHENG Junxia
ZHAO Xuefei
ZHU Yaming
LAI Shiquan
GAO Lijuan
Unit:
College of Chemical Engineering,University of Science and Technology Liaoning
Abstract:

The development of coal-measure needle coke in China originated in the 1980s. Now,the production of coal-measure needle coke has begun to take shape through decades of continuous efforts of relevant workers. The three main development stages of coal- measure needle coke preparation technology in our country were reviewed and summarized: technology development in laboratory and initial industrialization stage, the breakthrough of technical barriers of coal-measure needle coke industrialization and dream-realization localization stage, and the in-depth development stage of coal-measure needle coke technology. Meanwhile, the research focus and development direction of coal-measure needle coke technology in each development stage were introduced in detail. Current production technology process of coal-measure needle coke production companies in our country have been discussed and analyzed according to the pretreatment unit, delayed coking unit and calcination unit, respectively. In the pretreatment unit, three kinds of unique pretreatment technology have been developed based on the solvent extraction method. Overall, the raw material pretreatment operation with high refined pitch yield and ideal QI removal effect has been realized. There are two different process technologies (zero cycle ratio process and adjustable cycle ratio process) on the delayed coking unit during the industrial production of needle coke. Where, the fundamental difference is that the materials entering the coke tower are different, and the difference in the specific operation process was that the operation mode of zero cycle ratio process is constant temperature, variable pressure and short coke generation cycle. While the operation mode of adjustable cycle ratio process is variable temperature, variable pressure, and long coke generation cycle. Most coal-measure needle coke production enterprises choose the adjustable cycle ratio technology. Moreover, the calcination unit is major in rotary kiln calcination process and supplemented by the tank furnace calcination process. The former has a short processing cycle and ideal production capacity, but has large carbon burning loss, low yield, and is not friendly to the calcination of green needle coke containing more powders. Therefore, the calcination technology of tank furnace has been attracted a lot of attention again in the past two years. Based on the analysis of the current situation of domestic coal-measure needle coke technology, the existing situation of poor quality and serious "homogenization" of coal-measure needle coke products should be broken. The technical foundation research and continuous improvement of production process were emphasized to pay more attention according to the current situation of the coal-measure needle coke industry in our country. Which is favourable to improve the quality of China′s coal-based needle coke products and enhance the international competitiveness. Furthermore, the trend of industrial technology development of coal-based needle coke in the future was suggested as follows: through the development of two-stage coking process, the advanced production technology with simple operation, less human intervention, high process parameter control precision, friendly environment and high added value of by-products will be realized. On this basis, the strategic objectives of product quality "high-end quality" and the performance satisfaction "application differentiation" will be achieved to promote the orderly development of China′s coal-measure needle coke industry.

Keywords:
coal-measure needle coke
pretreatment
delayed coking
calcination
refined pitch
Citation format:
程俊霞(1982—),女,河南商丘人,讲师,博士。E-mail:cheng.anshan@163.com。
通讯作者:赵雪飞(1956—),男,辽宁铁岭人,教授,博士。E-mail:zhaoxuefei@sohu.com
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About Journal

  • Executive director

    China Coal Science and Industry Group Co., Ltd

  • Sponsored by

    Coal Science Research Institute Co., Ltd
    Coal Industry Clean Coal Engineering
    Technology Research Center

  • Editor in Chief

    XIE Qiang

  • Vice Editor-in-Chief

    YU Chang
    SHI Yixiang
    ZHAO Yongchun
    DUAN Linbo
    CAO Jingpei
    ZENG Jie

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