氧化锌精脱硫剂加压浸渍制备参数的优化

Optimization of the pressure impregnation process parameters for preparation of zinc oxide fine desulfurizer

采用加压水热浸渍法制备氧化锌精脱硫剂,考察了浸渍时间、煅烧温度和煅烧时间对脱硫剂硫化性能的影响。对制备的脱硫剂在硫化温度500℃,空速2 000 h-1,气氛为H2(体积分数39%)、CO(体积分数33%)、H2S(体积分数1×10-3)和N2的条件下进行了固定床活性评价。结果显示,随着浸渍时间的延长,脱硫剂的脱硫能力增强,但硫化后脱硫剂粉化程度加剧。加压浸渍时间5 h、500℃煅烧5 h制备出的氧化锌脱硫剂的脱硫效果最佳。SEM结果表明,该条件下制备出的脱硫剂活性组分ZnO在载体表面分布均匀,且粒径较小。

Zinc oxide fine desulfurizer agent as the active constituent was prepared by press water hot dipping process.The influences of soaking time,calcination heat and calcination time on curing performance of the desulfurizer agent were studied.At the curing temperature of 500 ℃,airspeed of 2000 h-1,and H2（39 vol %）,CO（33 vol %）,H2S（1 000 ppm） or N2 as the atmosphere,activeness of the prepared desulfurizer agent on the fixed bed was appraised.The results demonstrated that along with soaking time expanding,desulfurizer agent desulphurization ability was strengthened,but the pulverization degree of cured desulfurizer agent was aggravated.The desulphurization effect of zinc oxide desulfurizer agent prepared in the condition of soaking 5 hours and calcining 5 hours at 500 ℃ was best.As the SEM result indicated,ZnO active constituent of the desulfurizer agent prepared in this condition was distributed in the carrier surface equably and the particle size was small.