转炉LT法粉尘的表面吸附特性研究

Research on the surface adsorption property of converter LT dust

选取转炉干法除尘系统蒸发冷却器入口、粗灰斗、蒸发冷却器出口、细灰斗及静电除尘器出口5个不同位置的粉尘,进行比表面积、平均孔径和总孔容等孔隙结构的分析与比较。研究结果表明:转炉LT干法除尘粉尘的吸附等温线属于第Ⅱ类吸附等温线类型,粉尘的BET法比表面积和总孔容都随着粉尘粒径的减小逐渐增大,而平均孔径则随着粒径的减小而减小。该研究成果可为转炉干法除尘系统运行参数优化及粉尘综合利用提供基础数据。

Analyzed and compared with the specific surface area, average pore size and pore structure of converter LT dust in five different positions which were the entrance of the evaporative cooler, crude ash bucket, the exit of the evaporative cooler, fine ash bucket and the exit of the electrostatic precipi- tator in the converter dry dedusting system. The research results show that the adsorption isotherm of converter LT dust belongs to the typical type lI isotherm. The dust specific surface area of BET method and pore volume go up with the size of dust particle goes down, while the average pore size decreases with the size of dust particle decreases. Pore characteristic mainly affects the dedusting efficiency of electrostatic precipitator through changing the volume specific resistivity or surface specific resistivity of dust. The research results offer the basic data for operation parameter optimization of converter dry dedusting system and comprehensive utilization of dust.