Citation: ZHANG Chun-xiu, SU Sheng, CHEN Yi-feng, LIU Tao, YIN Zi-jun, WANG Zhong-hui, WANG Yi, HU Song, ZHAO Zhi-gang, XIANG Jun. Study on the effects of steam on the precipitation characteristics of sodium during coal thermal conversion[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(7): 769-775. shu

Study on the effects of steam on the precipitation characteristics of sodium during coal thermal conversion

ZHANG Chun-xiu ^1,2 ,
SU Sheng ^1,, ,
CHEN Yi-feng ¹ ,
LIU Tao ¹ ,
YIN Zi-jun ¹ ,
WANG Zhong-hui ¹ ,
WANG Yi ¹ ,
HU Song ¹ ,
ZHAO Zhi-gang ¹ ,
XIANG Jun ¹

1.
State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2.
Harbin Turbine Company Limited, Harbin 150046, China

Corresponding author: SU Sheng, susheng@mail.hust.edu.cn
Received Date: 18 May 2020
Revised Date: 28 June 2020

Fund Project: National Key R & D Program of China 2017YFB0601802National Natural Science Foundation of China U1910214The project was supported by National Key R & D Program of China (2017YFB0601802) and National Natural Science Foundation of China (U1910214)

Figures(6)

The char samples were prepared from the coal impregnated with NaCl under different steam concentrations and temperatures. The mode of occurrence of sodium and the contents of sodium in different chars with the same conversion ratio were analyzed by inductively coupled plasma mass spectrometry. The effects of steam and temperature on the migration and transformation of sodium in the coal during the thermal conversion processes were studied. The results showed that the increase of steam concentration enhanced the release of water-soluble sodium during the thermal conversion of coal and promoted the transformation of water-soluble sodium into ammonium acetate, hydrochloric acid and insoluble sodium. As a result, the release of sodium was suppressed to a certain extent. It was also observed that increasing the reaction temperature could promote the release of water-soluble sodium and promote the transformation of water-soluble sodium to the other soluble forms of sodium. The evolution of char structure was an important influence on the release of sodium. The results revealed that the degrees of char condensation increased with the steam gasification reaction. The formation of large aromatic ring structures from the condensation of the small aromatic rings played the important role in the encapsulation of sodium, which would inhibit the release of sodium.
- sodium,
- steam,
- temperature,
- migration transformation
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