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
  • [1] Li X.H., Ma J.S., Li L.L., Et al., Semi-coke as solid heat carrier for low-temperature coal tar upgrading, Fuel Processing Technology, 143, pp. 79-85, (2016)
  • [2] Cheng S., Lai D., Shi Z., Et al., Suppressing secondary reactions of coal pyrolysis by reducing pressure and mounting internals in fixed-bed reactor, Chinese Journal of Chemical Engineering, 25, 4, pp. 507-515, (2017)
  • [3] Gao Z., Zheng M., Zhang D., Et al., Low temperature pyrolysis properties and kinetics of non-coking coal in Chinese western coals, Journal of the Energy Institute, 89, 4, pp. 544-559, (2016)
  • [4] Ladner W.R., The products of coal pyrolysis: properties, conversion and reactivity, Fuel Processing Technology, 20, pp. 207-222, (1988)
  • [5] Liu J., Jiang X., Shen J., Et al., Influences of particle size, ultraviolet irradiation and pyrolysis temperature on stable free radicals in coal, Powder Technology, 272, pp. 64-74, (2015)
  • [6] Sonoyama N., Nobuta K., Kimura T., Et al., Production of chemicals by cracking pyrolytic tar from Loy Yang coal over iron oxide catalysts in a steam atmosphere, Fuel Processing Technology, 92, 4, pp. 771-775, (2011)
  • [7] Liu Z., Guo X., Shi L., Et al., Reaction of volatiles-a crucial step in pyrolysis of coals, Fuel, 154, pp. 361-369, (2015)
  • [8] Song H., Liu G., Zhang J., Et al., Pyrolysis characteristics and kinetics of low rank coals by TG-FTIR method, Fuel Processing Technology, 156, pp. 454-460, (2017)
  • [9] Hayashi J., Takahashi H., Doi S., Et al., Reactions in brown coal pyrolysis responsible for heating rate effect on tar yield, Energy & Fuels, 14, 2, pp. 400-408, (2000)
  • [10] Jin L., Bai X., Li Y., Et al., In-situ catalytic upgrading of coal pyrolysis tar on carbon-based catalyst in a fixed-bed reactor, Fuel Processing Technology, 147, pp. 41-46, (2016)
123