Evaluation of limestones for the purposes of desulphurisation during the fluid combustion of brown coal
Evaluation of limestones for the purposes of desulphurisation during the fluid combustion of brown coal
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DOI：
10.1016/j.fuel.2012.09.074
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发表时间：
2013-02
期刊：
影响因子：
7.4
通讯作者：
T. Hlinčík;P. Buryan
中科院分区：
文献类型：
--
作者：
T. Hlinčík;P. Buryan
对两种用于沸腾炉脱硫的石灰石进行的室内活性试验表明，它们的焙烧产物的脱硫能力与通常对石灰石中CaO绝对含量的看法还不一致。CaO含量较低的石灰石对燃气的脱硫率较高。这是由于CaO与灰渣和石灰石的压载氧化物的反应对燃烧气体的脱硫反应产生了显著的负面影响。两种石灰岩中压载氧化物的含量都随着粒度的减小而增加。在为给定的电力设备选择合适的石灰石时，有必要考虑这些副作用。根据燃煤的性质预先选择和优化石灰石颗粒的分布是有用的。因此，可以在遵守SO2排放限制的同时降低消耗。
Laboratory tests of the reactivity of two limestones used for desulphurization of fluidized bed boilers showed that the desulphurization capacity of their calcinates do not yet correspond to routinely applied opinions on the absolute content of CaO in the limestone. Limestone with lower CaO content desulphurised the combustion gas more. This was caused by the fact that the desulphurization reactions of combustion gas are significantly negatively affected by the reaction of CaO with ballast oxides of ash and limestone. The amount of ballast oxides in both limestones rises along with the decrease of the particle size. When choosing proper limestone for the given power equipment it is necessary to respect these side effects. It is useful to pre-select and optimise the distribution the limestone particles according to the nature of the burnt coal. Thereby it is possible to reduce the consumption while complying with the SO2emission limits.