煤快速热解制油技术问题的化学反应工程根源:逆向传热与传质

doi:10.11949/j.issn.0438-1157.20151718

化工学报 ›› 2016, Vol. 67 ›› Issue (1): 1-5.DOI: 10.11949/j.issn.0438-1157.20151718

煤快速热解制油技术问题的化学反应工程根源:逆向传热与传质

刘振宇

北京化工大学化工资源有效利用国家重点实验室, 北京 100029

收稿日期:2015-11-16 修回日期:2015-12-07 出版日期:2016-01-05 发布日期:2016-01-05
通讯作者: 刘振宇
基金资助:
国家自然科学基金项目(21276019);国家重点基础研究发展计划项目(2011CB201300)。

Origin of common problems in fast coal pyrolysis technologies for tar: the countercurrent flow of heat and volatiles

LIU Zhenyu

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Received:2015-11-16 Revised:2015-12-07 Online:2016-01-05 Published:2016-01-05
Supported by:
supported by the National Natural Science Foundation of China (21276019) and the National Basic Research Program of China (2011CB201300).

摘要/Abstract

摘要：

从化学反应工程的角度分析了煤热解过程中挥发物逸出方向与传热方向相反的现象,阐述了反应温度和反应时间对挥发物反应(二次反应)的不同作用,指出提高热源温度加快热解速度的方法反而会促进挥发物二次反应,导致焦油损失与结焦增加,进而提出抑制挥发物二次反应的关键是降低挥发物在反应器中的温升幅度。

关键词: 煤, 热解, 挥发物, 焦油, 传热, 传质

Abstract:

This paper analyzes fast coal pyrolysis technologies from a chemical reaction engineering point of view. It shows that the volatiles generated from coal transport in a direction against that of the heat transfer, and that the principle behind the fast coal pyrolysis technologies, i.e. reducing pyrolysis time by increasing the heating source temperature, may not reduce the reactions of volatiles as expected. Rather it promotes the reactions of volatiles leading to a low tar yield and formation of coke fines. Compared with the reduction in reaction time of volatiles the reduction in pyrolysis temperature is more important for reducing the volatiles' reaction (cracking), and therefore is favorable for a high tar yield and less coke formation in tar.

Key words: coal, pyrolysis, volatiles, tar, heat transfer, mass transfer

中图分类号:

TQ530.2

刘振宇. 煤快速热解制油技术问题的化学反应工程根源:逆向传热与传质[J]. 化工学报, 2016, 67(1): 1-5.

LIU Zhenyu. Origin of common problems in fast coal pyrolysis technologies for tar: the countercurrent flow of heat and volatiles[J]. CIESC Journal, 2016, 67(1): 1-5.

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煤快速热解制油技术问题的化学反应工程根源:逆向传热与传质

Origin of common problems in fast coal pyrolysis technologies for tar: the countercurrent flow of heat and volatiles

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