Use of limestone for SO2 removal from flue gas in the semidry FGD process with a powder-particle spouted bed
Use of limestone for SO2 removal from flue gas in the semidry FGD process with a powder-particle spouted bed
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DOI：
10.1016/s0009-2509(00)00090-7
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发表时间：
2000-10-01
影响因子：
4.7
通讯作者：
Kato, K
中科院分区：
文献类型：
--
作者：
Ma, XX;Kaneko, T;Kato, K
熟石灰通常用作喷雾干燥洗涤器中的 SO2 吸附剂，而石灰石在此类系统中的普遍条件下被认为不发生反应。然而，石灰石更容易获得，而且比熟石灰便宜几倍。我们尝试使用石灰石在粉末颗粒喷动床的半干法烟气脱硫工艺中去除烟气中的二氧化硫。如果在该过程中可以使用石灰石，那将具有特别的优势。在本研究中，研究了Ca/S摩尔比、SO2吸附剂粒径、气体在床层中的表观停留时间以及接近饱和温度等操作参数对SO2去除的影响。还根据石灰石和熟石灰的结构特性，对它们与 SO2 的反应性进行了比较。实验结果表明，通过增加Ca/S摩尔比、降低饱和温度和吸附剂尺寸，本工艺中石灰石的SO2去除效率显着提高。因此，就脱除效率、价格和吸附剂可用性而言，目前使用石灰石作为 SO2 吸附剂的工艺可能是其他 FGD 技术的有吸引力的替代方案。 (C) 2000 Elsevier Science Ltd. 保留所有权利。
Hydrated lime is normally used as SO2 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 SO2 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 SO2 removal were investigated, such as Ca/S molar ratio, particle size of SO2 sorbent, apparent residence time of gas in the bed and approach to saturation temperature. The comparison of reactivity with SO2 between limestone and hydrated lime was also made based on their structural properties. The experimental results showed that SO2 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 SO2 sorbent may be an attractive alternative to other FGD technologies in terms of removal efficiency, price and availability of sorbent. (C) 2000 Elsevier Science Ltd. All rights reserved.