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Research Papers: Fuel Combustion

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

[+] Author and Article Information
Qian Li, Yong He, Kang Zhang, Sunel Kumar, Kefa Cen

State Key Laboratory of Clean Energy Utilization,
Zhejiang University,
Hangzhou 310027, China

Zhihua Wang

State Key Laboratory of Clean Energy Utilization,
Zhejiang University,
38, Zheda Road,
Hangzhou 310027, China
e-mail: wangzh@zju.edu.cn

Zhenmin Lin

Jiangsu Power Design Institute Co., Ltd.,
China Energy Engineering Group,
Nanjing 211102, China

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received March 26, 2017; final manuscript received December 15, 2017; published online February 27, 2018. Assoc. Editor: Ashwani K. Gupta.

J. Energy Resour. Technol 140(7), 072201 (Feb 27, 2018) (7 pages) Paper No: JERT-17-1137; doi: 10.1115/1.4039268 History: Received March 26, 2017; Revised December 15, 2017

In this paper, the effects of hydrothermal modification on sulfur-containing pollutants, such as sulfur dioxide (SO2) and carbonyl sulfide (COS), during coal pyrolysis and combustion, have been investigated. Three typical Chinese low-quality coals, Zhundong, Yimin, and Zhaotong coal (ZT), have been treated by hydrothermal modification at final modification temperatures of 200 °C, 250 °C, and 300 °C. Coal pyrolysis and combustion experiments using raw coal and modified coals were performed using a tube furnace. Results showed that SO2 and COS emission were suppressed after hydrothermal modification in the pyrolysis process. Lower emission of both SO2 and COS were also achieved when final hydrothermal modification was increased, this was attributed to the loss of aliphatic sulfur, e.g., sulfoxide, sulfone, and thiother, during the modification process. For ZT, hydrothermal modification also caused a delay in the release of sulfur-containing gases. In combustion experiments, hydrothermal modification reduced the SO2 emission for Yimin coal, but for ZT, the SO2 release amount almost doubled, and for Zhundong coal (ZD), it also increased, after hydrothermal modification. Hydrothermal modification also caused a delay in peak SO2 emission during the combustion of ZT; this is attributed to conversion of sulfur containing structures to stable aromatic compounds through hydrothermal modification.

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Figures

Grahic Jump Location
Fig. 1

Schematic of hydrothermal modification apparatus

Grahic Jump Location
Fig. 2

Schematic of thermal transformation experiments system

Grahic Jump Location
Fig. 3

Release of sulfur-containing pollutants during 1000 °C pyrolysis: the name of each figure is the abbreviation of sulfur-containing pollutant and coal type, e.g., COS-ZT indicates COS release from ZT coal: (a) SO2-ZD, (b) COS-ZD, (c) SO2-YM, and (d) COS-YM, (e) SO2-ZT, and (f) COS-ZT

Grahic Jump Location
Fig. 4

Typical organic sulfur-containing groups in coal: S and O represents sulfur and oxygen atoms, R and R′ represents organic functional groups: (a) thiophene, (b) sulfoxide, (c) sulfone, and (d) thioether

Grahic Jump Location
Fig. 5

Release of SO2 under 1000 °C combustion: (a) ZD coal, (b) YM coal, and (c) ZT coal

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