闪蒸处理对石灰石脱硫性能的影响

The Impact of Flash Evaporation Modification on the Desufurization Performance of Limestone Particles

在自制的固体颗粒孔径增扩仪上对石灰石进行了闪蒸改性试验 ,并在气流反应器上对样品进行了煅烧和脱硫试验研究。结果表明 ,闪蒸改性处理能够增大石灰石的孔径 ,而且 ,在石灰石孔径增扩后 ,孔增之间的交联性得到了提高 ,比表面积稍有减少。石灰石经闪蒸改性后煅烧产物CaO的孔径向大孔方向偏移 ,同时由于闪蒸改性使反应气体的输运性能得到了较大的改善 ,减少了煅烧过程中烧结的影响 ,从而比表面积有了大幅度增大。在相同的试验条件下 ,闪蒸改性后样品的脱硫效率得到了明显提高。

On a solid-particle pore diameter enlargement device constructed by the authors flash-evaporation modification tests on limestone particles were performed and an experimental investigation of calcination and desulfurization was carried out on samples in a gas-flow reactor. It is found that the flash-evaporation modification treatment may lead to an increase in limestone pore diameter. In addition, with the enlargement of limestone pore diameter the cross-linkage properties among the pores will be enhanced, resulting in a slight decrease in specific surface area. The pore diameter of calcination product CaO after the flash-evaporation modification of the limestone will shift in the direction of securing a larger pore size. In the meantime, due to the flash-evaporation modification the transport performance of the reaction gas has been significantly improved, thus decreasing the sintering effect in the calcination process. As a consequence, the specific surface area will be increased considerably. Under identical test conditions the desulfurization efficiency of samples after the flash-evaporation modification has been markedly enhanced.