Use of limestone for SO2 removal from flue gas in the semidry FGD process with a powder-particle spouted bed
書誌事項
- 公開日
- 2000-10-01
- DOI
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- 10.1016/s0009-2509(00)00090-7
- 公開者
- Elsevier BV
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説明
Abstract Hydrated lime is normally used as SO 2 sorbent in spray dry scrubbers, whereas limestone is considered unreactive under conditions prevailing in such a system. However, limestone is more easily available and several times cheaper than hydrated lime. We tried to use limestone to remove SO 2 from flue gas in the semidry FGD process with a powder-particle spouted bed. If limestone can be utilized in the process it would be of particular advantage. In the present study, the effects of operating parameters on SO 2 removal were investigated, such as Ca/S molar ratio, particle size of SO 2 sorbent, apparent residence time of gas in the bed and approach to saturation temperature. The comparison of reactivity with SO 2 between limestone and hydrated lime was also made based on their structural properties. The experimental results showed that SO 2 removal efficiency of limestone was considerably enhanced in the present process by increasing Ca/S molar ratio and decreasing the approach to saturation temperature and sorbent size. Thus, the present process with limestone as SO 2 sorbent may be an attractive alternative to other FGD technologies in terms of removal efficiency, price and availability of sorbent.
収録刊行物
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- Chemical Engineering Science
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Chemical Engineering Science 55 4643-4652, 2000-10-01
Elsevier BV