Effect of char powder on gaseous tar reaction during low-rank coal pyrolysis

LI Ting; DU Tian-zhou; SHEN Yan-feng; YAN Lun-jing; KONG Jiao; WANG Mei-jun; WANG Jian-cheng; CHANG Li-ping; BAO Wei-ren

doi:10.1016/S1872-5813(21)60056-7

Volume 49 Issue 5

May 2021

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Article Navigation > Journal of Fuel Chemistry and Technology > 2021 > 49(5): 626-633

LI Ting, DU Tian-zhou, SHEN Yan-feng, YAN Lun-jing, KONG Jiao, WANG Mei-jun, WANG Jian-cheng, CHANG Li-ping, BAO Wei-ren. Effect of char powder on gaseous tar reaction during low-rank coal pyrolysis[J]. Journal of Fuel Chemistry and Technology, 2021, 49(5): 626-633. doi: 10.1016/S1872-5813(21)60056-7

Citation:

LI Ting, DU Tian-zhou, SHEN Yan-feng, YAN Lun-jing, KONG Jiao, WANG Mei-jun, WANG Jian-cheng, CHANG Li-ping, BAO Wei-ren. Effect of char powder on gaseous tar reaction during low-rank coal pyrolysis[J]. Journal of Fuel Chemistry and Technology, 2021, 49(5): 626-633. doi: 10.1016/S1872-5813(21)60056-7

Citation:

LI Ting, DU Tian-zhou, SHEN Yan-feng, YAN Lun-jing, KONG Jiao, WANG Mei-jun, WANG Jian-cheng, CHANG Li-ping, BAO Wei-ren. Effect of char powder on gaseous tar reaction during low-rank coal pyrolysis[J]. Journal of Fuel Chemistry and Technology, 2021, 49(5): 626-633. doi: 10.1016/S1872-5813(21)60056-7

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Effect of char powder on gaseous tar reaction during low-rank coal pyrolysis

doi: 10.1016/S1872-5813(21)60056-7

1.
State Key Laboratory of Clean and Efficient Coal Utilization,Taiyuan University of Technology, Taiyuan 030024, China
2.
Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Ministry of Education, Taiyuan 030024, China

Funds: The project was supported by National Key Research and Development Program of China (2016YFB0600302) and National Natural Science Foundation of China (22078224)

Received Date: 2020-12-31
Rev Recd Date: 2021-02-10

Available Online: 2021-03-08

Publish Date: 2021-05-28

Abstract

Abstract

The char powder entrained in gaseous tar influences the reaction of gaseous tar that exists in the transportation pipeline or dust removal equipment, which further affects the distribution and composition of pyrolysis products. This study investigated the effect of char powder on the reaction of gaseous tar during Naomaohu long-flame coal pyrolysis from 400 to 500 ℃ in a two-stage fluidized bed reactor. Results indicated that in addition to its thermal cracking and polycondensation reactions, catalytic cracking reaction of gaseous tar also occurred when char powder was added, resulting in the decrease of tar yield and pitch content, and the increase of pyrolysis gases and coke yield at different reaction temperatures. The thermal cracking and polycondensation reactions of gaseous tar intensified with increasing reaction temperature, which stabilized the gaseous tar and made it difficult to be catalyzed by char powder. Therefore, with the increase of reaction temperature, the influences of char powder on tar yield, tar pitch content and pyrolysis gases yield were reduced. The polycondensation reaction of free radicals from catalytic cracking of gaseous tar was prone to occur with increasing reaction temperature, which enhanced the effect of char powder on coke yield. Also, the catalytic cracking action of char powder reduced the content of heterocyclic compounds in tar at different reaction temperatures, and the reaction between gaseous tar and water was promoted by char powder, resulting in the decrease of aliphatics and aromatics contents in tar, and the increase of phenols and oxygenated compounds contents in tar at different reaction temperatures.
- char powder,
- low-rank coal,
- pyrolysis,
- gaseous tar,
- cracking reaction

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References(25)

References

[1]	赵宁, 刘东, 郭中山, 周家顺, 龚鑫, 于冉, 王峰. 低阶烟煤热解过程中氯的迁移释放特性研究[J]. 燃料化学学报,2019,47(9):1032−1041. doi: 10.3969/j.issn.0253-2409.2019.09.002 ZHAO Ning, LIU Dong, GUO Zhong-shan, ZHOU Jia-shun, GONG Xin, YU Ran, WANG Feng. Investigation on transferring and release characteristics of chlorine during pyrolysis of low rank coal[J]. J Fuel Chem Technol,2019,47(9):1032−1041. doi: 10.3969/j.issn.0253-2409.2019.09.002
[2]	潘生杰, 陈建玉, 范飞, 李鹏飞. 低阶煤分质利用转化路线的现状分析及展望[J]. 洁净煤技术,2017,23(5):7−12. PAN Sheng-jie, CHEN Jian-yu, FAN Fei, LI Peng-fei. Present situation analysis and prospect of low rank coal quality-based utilization conversion route[J]. Clean Coal Technol,2017,23(5):7−12.
[3]	陈兆辉, 高士秋, 许光文. 煤热解过程分析与工艺调控方法[J]. 化工学报,2017,68(10):3693−3707. CHEN Zhao-hui, GAO Shi-qiu, XU Guang-wen. Analysis and control methods of coal pyrolysis process[J]. J Chem Ind Eng,2017,68(10):3693−3707.
[4]	刘书贤, 门卓武, 郭屹, 陈爱国, 王向辉, 陈微, 翁力. 块煤热解提质工艺及反应器开发进展[J]. 洁净煤技术,2015,21(4):70−76. LIU Shu-xian, MEN Zhuo-wu, GUO Yi, CHEN Ai-guo, WANG Xiang-hui, CHEN Wei, WENG Li. Status and development of lump coal pyrolysis and reactor design technologies[J]. Clean Coal Technol,2015,21(4):70−76.
[5]	杜鑫, 黄茂丽, 齐彬彬, 李云. 粉煤热解含尘干馏气两级净化实验研究[J]. 煤炭学报,2018,43(10):255−261. DU Xin, HUANG Mao-li, QI Bin-bin, LI Yun. Experimental study on the two-stage purification of retorting gas in the process of pulverized coal pyrolysis[J]. J China Coal Soc,2018,43(10):255−261.
[6]	CHEN Q L, FANG M X, CEN J M, LU M L, SHAO S T, XIA Z X. Comparison of positive and negative DC discharge under coal pyrolysis gas media at high temperatures[J]. Powder Technol,2019,345:352−362. doi: 10.1016/j.powtec.2019.01.004
[7]	陈昭睿, 王勤辉, 郭志航, 贾鑫, 方梦祥, 骆仲泱. 热解气停留时间对典型烟煤热解产物的影响[J]. 热能动力工程,2015,30(5):756−761. CHEN Zhao-rui, WANG Qin-hui, GUO Zhi-hang, JIA Xin, FANG Meng-xiang, LUO Zhong-yang. Influence of the residence time of gases pyrolyzed on the pyrolytic products of typical bituminous coal[J]. J Eng Therm Energy Power,2015,30(5):756−761.
[8]	XU W C, AKIRA T. The effects of temperature and residence time on the secondary reactions of volatiles from coal pyrolysis[J]. Fuel Process Technol,1989,21(1):25−37. doi: 10.1016/0378-3820(89)90012-X
[9]	ZHOU Q Q, LIU Q Y, SHI L, YAN Y X, WU J F, XIANG C, WANG T, LIU Z Y. Effect of volatiles’ reaction on composition of tars derived from pyrolysis of a lignite and a bituminous coal[J]. Fuel,2019,242:140−148. doi: 10.1016/j.fuel.2019.01.005
[10]	敦启孟, 陈兆辉, 皇甫林, 周杨, 余剑, 高士秋, 刘鸿雁. 温度和停留时间对煤热解挥发分二次反应的影响[J]. 过程工程学报,2018,18(1):140−147. doi: 10.12034/j.issn.1009-606X.217192 DUN Qi-meng, CHEN Zhao-hui, HUANG Fu-lin, ZHOU Yang, YU Jian, GAO Shi-qiu, LIU Hong-yan. Influences of temperature and residence time on secondary reactions of volatiles from coal pyrolysis[J]. Chin J Process Eng,2018,18(1):140−147. doi: 10.12034/j.issn.1009-606X.217192
[11]	刘殊远, 汪印, 武荣成, 曾玺, 许光文. 热态半焦和冷态半焦催化裂解煤焦油研究[J]. 燃料化学学报, 2013, 41(9): 1041−1049. LIU Shu-yuan, WANG Yin, WU Rong-chen, ZENG Xi, XU Guang-wen. Research on coal tar catalytic cracking over hot in situ chars[J]. 2013, 41(9): 1041−1049.
[12]	JIN L J, BAI X Y, LI Y, DONG C, LI X. In-situ catalytic upgrading of coal pyrolysis tar on carbon-based catalyst in a fixed-bed reactor[J]. Fuel Process Technol,2016,147:41−46. doi: 10.1016/j.fuproc.2015.12.028
[13]	韩江则, 刘少杰, 申淑锋. 半焦催化裂解原位煤热解焦油的研究[J]. 现代化工,2017,37(2):62−65. HAN Jiang-ze, LIU Shao-jie, SHEN Shu-feng. Catalytic cracking of in situ coal pyrolysis tar over char catalyst[J]. Mod Chem Ind,2017,37(2):62−65.
[14]	王兴栋, 韩江则, 陆江银, 陆江银, 高士秋, 许光文. 半焦基催化剂裂解煤热解产物提高油气品质[J]. 化工学报,2013,63(12):3897−3905. WANG Xing-don, HAN Jiang-ze, LU Jiang-yin, GAO Shi qiu, XU Guan-gwen. Catalytic cracking of coal pyrolysis product for oil and gas upgrading over char-based catalysts[J]. J Chem Ind Eng,2013,63(12):3897−3905.
[15]	FU D Q, LI X H, LI W Y, FENG J. Catalytic upgrading of coal pyrolysis products over bio-char[J]. Fuel Process Technol,2018,176:240−248. doi: 10.1016/j.fuproc.2018.04.001
[16]	WANG F J , ZHANG S , CHEN Z D , LIU C,WANG Y G. Tar reforming using char as catalyst during pyrolysis and gasification of Shengli brown coal[J]. J Anal Appl Pyrolysis,2014,105:269−275.
[17]	ZHANG S, CHEN Z D, ZHANG H Y, WANG Y G, XU X Q, CHENG L, ZHANG Y M. The catalytic reforming of tar from pyrolysis and gasification of brown coal: Effects of parental carbon materials on the performance of char catalysts[J]. Fuel Process Technol,2018,174:142−148. doi: 10.1016/j.fuproc.2018.02.022
[18]	HAN J Z, WANG X D, YUE J R, XI B F, GAO S Q, XU G W. Catalytic upgrading of coal pyrolysis tar over char-based catalysts[J]. Fuel Process Technol,2014,122:4934−4941.
[19]	XU W C, TOMITA A. Effect of metal oxides on the secondary reactions of volatiles from coal[J]. Fuel,1989,68(5):673−676. doi: 10.1016/0016-2361(89)90173-7
[20]	FURUTANI Y, KUDO S, HAYASHI J I, NORINAGA K. Predicting molecular composition of primary product derived from fast pyrolysis of lignin with semi-detailed kinetic model[J]. Fuel,2018,212:515−522. doi: 10.1016/j.fuel.2017.10.079
[21]	PÜTÜN A E, APAYDIN E, PETÉN E. Rice straw as a bio-oil source via pyrolysis and steam pyrolysis[J]. Energy,2004,29(12-15):2171−2180. doi: 10.1016/j.energy.2004.03.020
[22]	郭林丹. 水蒸气对煤与生物质共热解的影响[D]. 大连: 大连理工大学, 2013. GUO Lin-dan. Influence of steam on co-pyrolysis of coal and biomass[D]. Dalian: Dalian University of Technology, 2013.
[23]	WU J F, LIU QY, WANG R X, HE W J, SHI L, GUO X J, CHEN Z Z, JI L M. Coke formation during during thermal reaction of tar from pyrolysis of a subbituminous coal[J]. Fuel Process Technol,2017,155:68−73. doi: 10.1016/j.fuproc.2016.03.022
[24]	DONG L, HANS, YU W H, LEI Z P, KANG S G, ZHANG K, YANG J C, LI Z K, SHUI H F, WANG Z C, REN S B, PAN C X. Effect of volatile reactions on the yield and quality of tar from pyrolysis of Shenhua bituminous coal[J]. J. Anal Appl Pyrolysis,2019,140:321−330. doi: 10.1016/j.jaap.2019.04.009
[25]	FIDALGO B, NIEKERK D V, MILLAN M. The effect of syngas on tar quality and quantity in pyrolysis of a typical south african inertinite-rich coal[J]. Fuel,2014,134:90−96. doi: 10.1016/j.fuel.2014.05.032