Citation: WANG Bao-wen, WANG Wei, LI He-yu, CAI Zhong-yuan, JIANG Tao, LIANG Yan-chen, DING Ning. Study on the performance of the purified CaSO₄ oxygen carrier derived from wet flue gas desulphurization slag in coal chemical looping combustion[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(8): 908-919. shu

Study on the performance of the purified CaSO₄ oxygen carrier derived from wet flue gas desulphurization slag in coal chemical looping combustion

1.
North China University of Water Resources and Electric Power, Zhengzhou 450045, China
2.
HeBei Ji-Yan Energy Science and Technology Research Institute, Shijiazhuang 050000, China

Corresponding author: WANG Bao-wen, david-wn@163.com
Received Date: 21 May 2020
Revised Date: 19 July 2020

Fund Project: the Key Scientific and Technological Project of Henan Province 162102210233National Natural Science Foundation of China 51776073The project was supported by National Natural Science Foundation of China (51776073, 51276210), the Key Scientific and Technological Project of Henan Province (162102210233), Research Project of Ji-Yan Energy Science and Technology Research Institute (2020-05) and Innovative Technology Project of North China University of Water Resources and Electric Power (2019XA014)Research Project of Ji-Yan Energy Science and Technology Research Institute 2020-05National Natural Science Foundation of China 51276210Innovative Technology Project of North China University of Water Resources and Electric Power 2019XA014

Figures(13)

Flue gas desulphurized slag was collected as the raw material and purified using the multiple steps of sour purification procedures, which was further prepared as CaSO₄ oxygen carrier (OC). Reaction characteristics of the purified desulphurized slag OC with the selected lignite as well as release of the different gaseous sulfur species from the CaSO₄ side reactions were investigated on in a lab-scale fixed bed reactor. Several main influencing factors, including reaction temperature, OC excess number Φ and the cycle numbers, were focused. The experimental results indicated that the purified CaSO₄ OC was of high reactivity and promising to be applied in the coal-fueled chemical looping combustion process as OC. Furthermore, according to the pros and cons of the three influencing factors on the carbon conversion versus the gaseous sulfur release, the optimized reaction conditions were determined as 900℃ and the OC excess number around 1.0. Finally, under this optimized reaction condition, the effect of the cycle numbers was evaluated and found that the continuous release of gaseous sulfur from the CaSO₄ side reactions deteriorated the reactivity of the purified CaSO₄ OC and its reaction stability was diminished with the five cycles.
- coal,
- chemical looping combustion,
- purified desulfurization slag,
- reaction characteristics,
- sulfur evolution
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Study on the performance of the purified CaSO4 oxygen carrier derived from wet flue gas desulphurization slag in coal chemical looping combustion

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通讯作者: 陈斌, bchen63@163.com

Study on the performance of the purified CaSO₄ oxygen carrier derived from wet flue gas desulphurization slag in coal chemical looping combustion