TY - JOUR
T1 - Characteristics of the mercury vapor removal from coal combustion flue gas by activated carbon using H2S
AU - Morimoto, Takefumi
AU - Wu, Shengji
AU - Azhar Uddin, Md
AU - Sasaoka, Eiji
N1 - Funding Information:
This work was supported by the Steel Industrial Foundation for Advancement of Environmental Protection Technology and also 21th COE projects of Okayama University.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2005/10
Y1 - 2005/10
N2 - Removal of Hg0 vapor from the simulated coal combustion flue gases with a commercial activated carbon was investigated using H2S. This method is based on the reaction of H2S and Hg over the adsorbents. The Hg0 removal experiments were carried out in a conventional flow type packed bed reactor system in the temperature range of 80-150 °C using simulated flue gases having the composition of Hg 0 (4.9 ppb), H2S (0-20 ppm), SO2 (0-487 ppm), CO2 (10%), H2O (0-15%), O2 (0-5%), N 2 (balance gas). The following results were obtained: in the presence of both H2S and SO2, Hg removal was favored at lower temperatures (80-100 °C). At 150 °C, presence of O2 was indispensable for Hg0 removal from H2S-SO2 flue gas system. It is suggested that the partial oxidation of H2S with O2 to elemental sulfur (H2S+1/2O2=S ad+H2O) and the Clause reaction (SO2+2H 2S=3Sad+2H2O) may contribute to the Hg 0 removal over activated carbon by the following reaction: S ad+Hg=HgS. The formation of elemental sulfur on the activated carbon was confirmed by a visual observation.
AB - Removal of Hg0 vapor from the simulated coal combustion flue gases with a commercial activated carbon was investigated using H2S. This method is based on the reaction of H2S and Hg over the adsorbents. The Hg0 removal experiments were carried out in a conventional flow type packed bed reactor system in the temperature range of 80-150 °C using simulated flue gases having the composition of Hg 0 (4.9 ppb), H2S (0-20 ppm), SO2 (0-487 ppm), CO2 (10%), H2O (0-15%), O2 (0-5%), N 2 (balance gas). The following results were obtained: in the presence of both H2S and SO2, Hg removal was favored at lower temperatures (80-100 °C). At 150 °C, presence of O2 was indispensable for Hg0 removal from H2S-SO2 flue gas system. It is suggested that the partial oxidation of H2S with O2 to elemental sulfur (H2S+1/2O2=S ad+H2O) and the Clause reaction (SO2+2H 2S=3Sad+2H2O) may contribute to the Hg 0 removal over activated carbon by the following reaction: S ad+Hg=HgS. The formation of elemental sulfur on the activated carbon was confirmed by a visual observation.
KW - Activated carbon
KW - Coal combustion flue gas
KW - H S
KW - Removal of mercury vapor
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U2 - 10.1016/j.fuel.2005.04.007
DO - 10.1016/j.fuel.2005.04.007
M3 - Article
AN - SCOPUS:20744445567
SN - 0016-2361
VL - 84
SP - 1968
EP - 1974
JO - Fuel
JF - Fuel
IS - 14-15
ER -