Effects of temperature gradient and product flow on distribution of pyrolysis products of Xianfeng lignite

被引：0
作者：
Zhou G. [1 ]
Liu Z. [1 ,2 ]
Zhan J. [2 ]
Lai D. [2 ]
Liu X. [2 ]
机构：
[1] School of Environmental and Chemical Engineering, Heilongjiang University of Science and Technology, Harbin
[2] State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing
来源：
Huagong Xuebao/CIESC Journal | 2018年 / 69卷 / 06期
关键词：
Char; Coal pyrolysis; Secondary reactions; Temperature;
D O I：
10.11949/j.issn.0438-1157.20171345
中图分类号：
学科分类号：
摘要：
The processes of coal pyrolysis and secondary reactions were separated by using two-stage fixed bed reactor to simulate the product flow and the interactions among reaction particles for coal pyrolysis in the traditional indirect heating reactor and indirect heating reactor with internals, and to investigate the effects of different temperature char on the distribution and quality of pyrolysis products of Xianfeng lignite. The results showed that the drastic secondary reactions occurred when tar flowed through the 500-900 ℃ char layer, the yield of pyrolysis gas increased, the tar yield and atomic H/C ratio were lower than those of blank control experiment, and the quality of oil decreased. Under the action of 100-400 ℃ char layer, the slight secondary reaction of the tar occurred, the yield of pyrolysis gas increased slightly, the tar yield had a little decrease, the atomic H/C ratio was higher than that of blank control, and the oil quality increased. The results verified the conclusion that the tar with indirect heating reactor with internals produced higher yield and better quality. © 2018, Science Press. All right reserved.
引用
收藏
页码：2672 / 2680
页数：8
相关论文
共 29 条
  • [11] Liu Z.Y., Origin of common problems in fast coal pyrolysis technologies for tar: the countercurrent flow of heat and volatiles, CIESC Journal, 67, 1, pp. 1-5, (2016)
  • [12] Chen Z.H., Gao S.Q., Xu G.W., Analysis and control methods of coal pyrolysis process, CIESC Journal, 68, 10, pp. 3693-3707, (2017)
  • [13] Khan M.R., A literature survey and an experimental study of coal devolatilization at mild and severe conditions: influences of heating rate, temperature, and reactor type on products yield and composition, Fuel, 68, 12, pp. 1522-1531, (1989)
  • [14] Doolan K.R., Mackie J.C., Tyler R.J., Coal flash pyrolysis: secondary cracking of tar vapours in the range 870-2000 K, Fuel, 66, 4, pp. 572-578, (1987)
  • [15] Xu W.C., Tomita A., The effects of temperature and residence time on the secondary reactions of volatiles from coal pyrolysis, Fuel Processing Technology, 21, 1, pp. 25-37, (1989)
  • [16] Zeng D., Hu S., Sayre A.N., Et al., On the rank-dependence of coal tar secondary reactions, Proceedings of the Combustion Institute, 33, 2, pp. 1707-1714, (2011)
  • [17] Shui H.F., Zhang D.X., Zhang C.Q., Separation and Purification of Coal Tar, (2007)
  • [18] Zhang C., Wu R., Xu G., Coal pyrolysis for high-quality tar in a fixed-bed pyrolyzer enhanced with internals, Energy & Fuels, 28, 1, pp. 236-244, (2013)
  • [19] Lai D.G., Zhan J.H., Chen Z.H., Et al., Oil shale pyrolysis by solid heat carrier in internal-structured moving bed, CIESC Journal, 68, 10, pp. 3647-3657, (2017)
  • [20] Chen Z.R., Influence of gas residence time on product distribution of coal pyrolvsis, (2015)
123