Citation: PENG Bing-xian, WU Dai-she, ZHOU Ai-hong. Study on release and transformation of iodine from anthracite during combustion[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(3): 265-271. shu

Study on release and transformation of iodine from anthracite during combustion

1.
College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
2.
School of Environment and Chemical Engineering, Nanchang University, Nanchang 330031, China
3.
Jiangxi Diyuan Drainage and Water Quality Detection Company Limited, Nanchang 330025, China

Corresponding author: PENG Bing-xian, pbingxian@163.com
Received Date: 16 December 2016
Revised Date: 5 February 2017

Fund Project: Scientific and Technological Plan Project of Jiangxi Province in China 20141BBG70008the Natural Science Foundation of Jiangxi Province in China 20142BAB203020

Figures(5)

Modes of iodine occurrence in 4 Chinese anthracites and the combustion residues obtained at each temperature were extracted with sequential chemical extraction. The coal combustion was simulated with a tube furnace, the effects and mechanisms of heating temperature, heating time, O₂ flow rate and water vapor on iodine release and transformation behavior during anthracite combustion were investigated. The results showed iodine in anthracites can present typically in three main modes of occurrence:organic matter-bound, Fe-Mn oxide-bound and water-soluble form. Temperature had a pronounced effect on iodine release and transformation. Iodine release increased with the increase of temperature, and 500-900℃ was a main stage for iodine release. Before 700℃, some forms of iodine which include water-soluble, ion-exchangeable and organic matter-bound iodine can be almost emitted completely and partly transformed into the carbonate-bound, Fe-Mn oxide-bound and residue-bound iodine. The Fe-Mn oxide-bound iodine may be mainly emitted in 700-900℃, and the residue-bound iodine was emitted partly before 1 100℃.Moreover, the iodine release from anthracite increased with the increase of heating time and O₂ flow rate, and water vapor can obviously promote the iodine release. 93.8%-95.9% of iodine may be emitted in the form of HI and I₂ at the given experimental condition of 1 100℃, water vapor access, O₂ flow rate of 120 mL/min and combustion time of 20 min.
- anthracite,
- combustion,
- iodine,
- modes of occurrence,
- release,
- transformation
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