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research-article

Effects of Hydrothermal Modification on Sulfur Release of Low-Quality Coals during Thermal Transformation Process

[+] Author and Article Information
Qian Li

State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027, Hangzhou, China
liqianzju@zju.edu.cn

Zhihua Wang

State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027, Hangzhou, China
wangzh@zju.edu.cn

Zhenmin Lin

Jiangsu Power Design Institute Co., Ltd. of China Energy Engineering Group, 211102, Nanjing, China
lzm2134@163.com

Yong He

State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027, Hangzhou, China
heyong@zju.edu.cn

Kang Zhang

State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027, Hangzhou, China
zhangkang@zju.edu.cn

Sunel Kumar

State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027, Hangzhou, China
sunelkotak@zju.edu.cn

Kefa Cen

State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027, Hangzhou, China
kfcen@zju.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4039268 History: Received March 26, 2017; Revised December 15, 2017

Abstract

In this paper, the effects of hydrothermal modification of sulfur-containing pollutants, such as SO2 and COS, during coal pyrolysis and combustion process, have been investigated. Three typical Chinese low-quality coals, Zhundong, Yimin and Zhaotong coal, have been used to conduct hydrothermal modification process with the final modification temperatures of 200oC, 250oC and 300 oC. Coal pyrolysis and combustion experiments of raw coal and modified coals were performed using a tube furnace. Results showed that SO2 and COS emission had been suppressed after hydrothermal modification during pyrolysis process. Lower emission of both SO2 and COS can also be achieved if final hydrothermal modification is higher, this is because of the loss of aliphatic sulfur, such as sulfoxide, sulfone and thiother, in the modification process. For Zhaotong coal, hydrothermal modification also caused a delay of the release time of sulfur-containing gases. In combustion experiments, hydrothermal modification reduced the SO2 emission for Yimin coal, but for Zhaotong coal, the SO2 release amount almost doubled, and for Zhundong coal, it also increased, after hydrothermal modification. Modification also caused SO2 peak delay in the combustion process of Zhaotong coal, after hydrothermal modification, sulfur-containing structures were converted to more stable aromatic structures.

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