Citation: 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]. Journal of Fuel Chemistry and Technology, ;2019, 47(9): 1032-1041. shu

Investigation on transferring and release characteristics of chlorine during pyrolysis of low rank coal

ZHAO Ning ¹ ,
LIU Dong ^1,, ,
GUO Zhong-shan ² ,
ZHOU Jia-shun ¹ ,
GONG Xin ¹ ,
YU Ran ¹ ,
WANG Feng ²

1.
State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University Of Petroleum(East China), Qingdao 266580, China
2.
CTL Chemical of SNCG, Yinchuan 751410, China

Corresponding author: LIU Dong, liudong@upc.edu.cn
Received Date: 23 April 2019
Revised Date: 12 June 2019

Fund Project: The project was supported by the National Key Research and Development Project of China (2017YFB0602500)the National Key Research and Development Project of China 2017YFB0602500

Figures(12)

In order to reveal the release mechanism of chlorine(Cl) in low rank coal during pyrolysis process, a low rank coal from northern Shaanxi was pyrolyzed at different temperatures, particle sizes and heating rates in a tubular reactor and a Thermo Gravimetric-Infrared-Mass spectrometry (TG-IR-MS) to investigate the transferring and release characteristics of Cl during pyrolysis process. The dynamic model of Cl transferring and release was built based on the process of coal pyrolysis. The results show that the chloric species from the pyrolysis of low rank coal is HCl and little Cl₂, and the temperature strongly influences the release rate of Cl during pyrolysis in the tubular reactor. With the pyrolysis temperature increasing from 300 to 800 ℃, the release rate of Cl increases significantly, reaching to 49.5% at 800 ℃, while the fraction of Cl in the char decreases and the fraction of Cl in coal tar and pyrolysis gas increases gradually. The release rate of Cl has a maximum of 35.8% as the particle size is 3.0-4.0 mm. The particle size also affects the distribution of Cl in pyrolysis products. Moreover, increasing the heating rate is beneficial to the devolatilization, and the release rate of Cl in coal changes obviously as the heating rate is 15-25 ℃/min, but much higher heating rate will result in the decrease of the release rate of Cl in coal. Most Cl species in the coal tar is in form of water-soluble inorganic chlorides, and therefore the ultrapure water can present a better performance to remove chlorides. The release activation energy of chlorine in pyrolysis is about 20 kJ/mol.
- low rank coal,
- pyrolysis,
- coal tar,
- TG-IR-MS,
- dynamics
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