Performance of simultaneous desulfurization and denitration using limestone modified by wood vinegar in O<sub>2</sub>/CO<sub>2</sub> coal combustion

HAN Kui-hua; QI Jian-hui; LI Hui; LIU Hong-tao; LU Chun-mei

Volume 41 Issue 11

Nov. 2013

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Article Navigation > Journal of Fuel Chemistry and Technology > 2013 > 41(11): 1378-1383

HAN Kui-hua, QI Jian-hui, LI Hui, LIU Hong-tao, LU Chun-mei. Performance of simultaneous desulfurization and denitration using limestone modified by wood vinegar in O2/CO2 coal combustion[J]. Journal of Fuel Chemistry and Technology, 2013, 41(11): 1378-1383.

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HAN Kui-hua, QI Jian-hui, LI Hui, LIU Hong-tao, LU Chun-mei. Performance of simultaneous desulfurization and denitration using limestone modified by wood vinegar in O₂/CO₂ coal combustion[J]. Journal of Fuel Chemistry and Technology, 2013, 41(11): 1378-1383.

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Performance of simultaneous desulfurization and denitration using limestone modified by wood vinegar in O₂/CO₂ coal combustion

School of Energy and Power Engineering, Shandong University, Jinan 250061, China

Received Date: 2013-03-09
Rev Recd Date: 2013-05-26
Publish Date: 2013-11-30

Abstract

Abstract

The performance of simultaneous desulfurization and denitration during coal combustion in O₂/CO₂ atmosphere with premixed and injected limestone modified by wood vinegar (LMWV) was investigated in a tube furnace and a drop tube furnace, respectively. The SO₂ and NO reduction efficiency are 91.0%~94.9% and 23.5%~30.8% respectively during the combustion of coal premixed with LMWV at 1 173 ~ 1 323 K at the Ca/S molar ratio of 2.0. The desulfurization and denitration rates increase with raising the Ca/S molar ratio, and the optimum Ca/S molar ratio is from 1.5 to 2.0. The higher the sulfur content of coal, the greater desulfurization and denitration rates are gained during coal combustion. The performance of desulfurization and denitration with LMWV is better than that with calcium acetate. The maximum desulfurization and denitration rates of 75.8% and 86.6% respectively are gained by injecting LMWV directly into the flue gas of O₂/CO₂ coal combustion at both 1 223 K and 1 323 K and the Ca/S molar ratio of 2.0 with a residence time of 0.8 s. When the ammonia is injected into the reactive zone at [NH₃]/[NO] molar ratio of 0.75, the desulfurization rates are 73.2% and 63.9%, and the denitration rates are 93.2% and 94.8%, respectively at the combustion temperature of 1 223 K and 1 323 K.
- O₂/CO₂,
- coal combustion,
- desulfurization and denitration,
- wood vinegar,
- modify,
- limestone

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References(17)

References

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