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过程工程学报 ›› 2016, Vol. 16 ›› Issue (3): 516-521.DOI: 10.12034/j.issn.1009-606X.215418

• 材料工程专栏 • 上一篇    下一篇

复合流化床低阶煤热解制备兰炭的工艺条件

周琦 白立强 陈兆辉 高士秋 许光文   

  1. 煤炭科学技术研究院有限公司 中国科学院过程工程研究所多相复杂系统国家重点实验室 中国科学院过程工程研究所多相复杂系统国家重点实验室 中国科学院过程工程研究所多相反应重点实验室 中国科学院过程工程研究所多相复杂系统国家重点实验室
  • 收稿日期:2015-12-16 修回日期:2016-01-07 出版日期:2016-06-20 发布日期:2017-04-28
  • 通讯作者: 高士秋

Preparation Conditions of Semi-coke via Pyrolysis of Low-rank Coal in an Integrated Fluidization Bed

ZHOU Qi BAI Li-qiang CHEN Zhao-hui GAO Shi-qiu XU Guang-wen   

  1. National Key Laboratory of Multi-phase Complex System, Institute of Process Engineering, CAS National Key Laboratory of Multi-phase Complex System, Institute of Process Engineering, CAS Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences
  • Received:2015-12-16 Revised:2016-01-07 Online:2016-06-20 Published:2017-04-28
  • Contact: GAO Shi-qiu

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摘要： 以不同粒径范围的新疆准东煤为原料，在耦合下部流化床和上部输送床的复合流化床中热解制备兰炭，考察了热解温度、过量氧气系数、气化温度、煤颗粒停留时间等对热解产物分布和热解半焦性质的影响. 结果表明，随过量氧气系数、气化温度和颗粒平均停留时间增加，气体产率升高，半焦和焦油产率降低；半焦的比表面积随气化温度升高而增大，而随过量氧气系数增大先增大后减小. 当煤从下部流化床进料时，在过量氧气系数0.11、流化床气化温度850℃、输送床热解温度750℃、流化床内煤颗粒停留时间90 s的操作条件下，可制备出固定碳含量超过83%(w)、挥发分含量低于9%(w)的兰炭.

关键词: 复合流化床, 低阶煤, 兰炭, 热解, 气化

Abstract: Preparation conditions of semi-coke via pyrolysis of Xinjiang Zhundong coal with different sizes were studied in an integrated fluidization bed consisting of a fluidization bed section at the bottom and a transport bed section at the top. The effects of pyrolysis temperature, excessive oxygen ratio (ER), gasification temperature and residence time on product distributions and char properties were investigated. The yield of pyrolysis gas increased with ER, gasification temperature and residence time, while the yields of char and tar decreased. The specific surface area of the char increased with the gasification temperature, while it first increased and then decreased with ER. When coal was fed into the fluidization bed, the semi-coke with the fixed carbon content over 83%(w) and volatile matter below 9%(w) was obtained under the operating conditions of ER of 0.11, gasification temperatures of 850℃ in the fluidization bed, pyrolysis temperature of 750℃ in the transport bed, and coal particle residence time of 90 s in the fluidization bed.

Key words: integrated fluidization bed, low-rank coal, semi-coke, pyrolysis, gasification

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