Desulphurization Characteristics of Waste Cement Particles for the Flue Gas Desulphurization
Dry desulphurization performances of waste cement particles were examined with a laboratory-scale experimental apparatus based on the weight change of the sample caused by the exposure to a gas flow containing SO2. The waste cement particles, a byproduct of recycling process of aggregates from waste concrete, are fine particles with the diameter distributed in the range of 10 to 200 μm, and the average diameter of 105 μm. Effect of the operation parameters, I.e., SO2 concentration, oxygen concentration, temperature, on the desulphurization performances were investigated. The SO2 concentration in the gas flow was changed in the range of 60 ppm to 1500 ppm balanced with nitrogen and oxygen. The oxygen concentration was also changed in the range of 0 to 10％. The reaction temperature was changed in the range of 650 ℃ to 950 ℃. The desulphurization rates were found to depend on the 1.26-th order of SO2 concentration and almost independent of the oxygen concentration in the gas flow. Arrhenius type temperature dependence was observed up to 850 °C with the activation energy of 8.95 Kj/mol. The desulphurization rate of the waste cement particle for SO2 is about one third of that of pure calcium hydroxide based on the weight of the sorbent. However, the desulphurization rate based on the utilization ratio of calcium contained in the waste cement sample per unit surface area was almost equivalent with pure calcium hydroxide. The waste cement particle could be applicable to the dry desulphurization process as a low cost sorbent derived from wastes.
waste cement flue gas desulphurization thermo-gravimetric characterization
Jiawei Wu Atsushi Iizuka Akihiro Yamasaki Kazukiyo Kumagai Yukio Yanagisawa
Institute of Environmental Studies, Graduate School of Frontier Science, The University of Tokyo, 5- Institute of Environmental Management Technology, National Institute of Advanced Industrial Science
国际会议
2007环境科学与技术国际会议(The 2007 International Symposium on Environmental Science and Technology)
北京
英文
2007-11-13（万方平台首次上网日期，不代表论文的发表时间）