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| Yoshizo Suzuki | |
| Thermal Energy and Combustion Engineering Department, | |
| National Institute for Resources and Environment, AIST, MITI | |
| Onogawa 16-3, Tsukuba, Ibaraki, 305-8569 Japan | |
| Phone +81-298-61-8225, Fax +81-298-61-8209 | |
| E-mail y_Suzuki@nire.go.jp |
19,989,000 Yen
(FY 1999; 6,541,000 Yen)
To establish the control technique of SO2 emission from the combustion of high sulfur coal produced in southwestern region of China, a new low cost flue gas treatment process using a circulating fluidized bed was studied. This method showed higher performance and SO2 removal efficiency achieved to 85% at Ca/S=1.7. Water steam played a vital role for the desulfurization reaction. Elutriation of fine absorber can be controlled in the range of 50-100%. It means stable operation is possible. Cost of this new process was estimated for a 10 tons/day scale model boiler. Estimated cost was 105,000 Yuan for construction and 1,200 Yuan for daily operation. It means this new process is a competent among other low cost desulfurization processes.
Chemical composition, physical structure after calcination, and reactivity were tested for 7 kinds of Chinese limestone as an absorbent. Generally, purity of CaO was not high as Japanese limestone, and MgO content was rather high. The most important property determining final conversion was the porosity of the absorber particle. There was a good relationship between Mg/Ca molar ratio and porosity. Limestone with higher Mg/Ca showed higher conversion.
Acid rain, Low cost desulfurization, Limestone