Cycle experiments on chemical looping combustion of coal using potassium-improved iron ore as oxygen carrier

GU Hai-ming; SHEN Lai-hong; XIAO Jun; ZHANG Si-wen; SONG Tao

Volume 40 Issue 08

Aug. 2012

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GU Hai-ming, SHEN Lai-hong, XIAO Jun, ZHANG Si-wen, SONG Tao. Cycle experiments on chemical looping combustion of coal using potassium-improved iron ore as oxygen carrier[J]. Journal of Fuel Chemistry and Technology, 2012, (08): 927-934.

Citation:

GU Hai-ming, SHEN Lai-hong, XIAO Jun, ZHANG Si-wen, SONG Tao. Cycle experiments on chemical looping combustion of coal using potassium-improved iron ore as oxygen carrier[J]. Journal of Fuel Chemistry and Technology, 2012, (08): 927-934.

Citation:

GU Hai-ming, SHEN Lai-hong, XIAO Jun, ZHANG Si-wen, SONG Tao. Cycle experiments on chemical looping combustion of coal using potassium-improved iron ore as oxygen carrier[J]. Journal of Fuel Chemistry and Technology, 2012, (08): 927-934.

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Cycle experiments on chemical looping combustion of coal using potassium-improved iron ore as oxygen carrier

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China

Received Date: 2011-10-19
Rev Recd Date: 2011-12-27
Publish Date: 2012-08-31

Abstract

Abstract

The cycle experiments on chemical looping combustion of coal were carried out in a fluidized bed using a K-promoted iron ore as oxygen carrier. The continued effect of the K-promoted iron ore on the gas compositions, fractions of carbonaceous gases was investigated.The results showed that the reaction time was shortened by the K-promoted iron ore,and that the CO₂ concentration was significantly increased.The CO₂ fraction for the K-promoted iron ore was much higher than that for the iron ore whereas,the CO fraction was much lower during 20 cycles.After 11 cycles, the CO₂ fraction slightly decreased with a slight increase in CO fraction for the K-promoted iron ore. The reduced oxygen carriers after different cycles were characterized by SEM-EDS (Scanning Electron Microscope-Energy Dispersive Spectrometer) and XRD (X-ray diffraction).Compared with pure iron ore, the K-promoted iron ore showed serious sinter on the oxygen carrier particles during the first 11 cycles. The oxygen carrier, however, re-obtained the porous structure after 20 cycles due to the loss of potassium.The XRD showed that the KFe₁₁O₁₇ or its derivatives displayed the catalytic effect on coal gasification in the process of chemical looping combustion and the oxygen carrier could be regenerated to Fe₂O₃ after 20 cycles.
- potassium,
- iron ore,
- coal,
- chemical looping combustion

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References(22)

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