微波制备高效脱硫脱硝吸附剂及性能

Microwave Preparation and Properties of High-efficiency Desulfurization and Denitrification adsorbent

以粉煤灰、电石渣为原料,在微波场下制备了吸附剂样品,探究反应温度、粉煤灰与电石渣配比、微波功率、辐射时间等因素对脱硫脱硝性能的影响,进而探寻最优的吸附剂制备条件。结果表明:微波能显著提高吸附剂性能,在粉煤灰与电石渣配比为1:2、微波功率800 W、微波辐射时间5 min、反应温度250℃时,脱硫率为99%,脱硝率为96%,脱硫性能略好于脱硝性能,SO2和NO的t 90%脱硫脱硝率达到90%的时间依次为10 min、5 min;运用SEM、XRD、BET等技术对吸附剂进行了表征。XRD结果表明:反应后的样品存在MgSO4、 Ca(NO2)2、CaSO4的衍射峰。动力学分析表明:高效脱硫脱硝阶段,脱硫符合二级动力学与颗粒内扩散模型共同作用,脱硝符合颗粒内扩散模型;整体脱硫脱硝阶段,脱硫符合颗粒内扩散模型,脱硝符合二级动力学模型。以粉煤灰与电石渣为原料的吸附剂性能优异,有十分重要的环保意义和经济应用前景。

Adsorbent samples were prepared from fly ash and calcium carbide slag under microwave field.The influence of reaction temperature,ratio of fly ash to calcium carbide slag,microwave power and radiation time on the desulfurization and denitrification performance,and then the optimal preparation conditions of the adsorbent were investigated.The results showed that microwave can significantly improve the properties of the adsorbents.When the ratio of fly ash to calcium carbide slag is 1:2,the microwave power is 800 W,the microwave radiation time is 5 min and the reaction temperature is 250℃,the desulfurization rate is 99%and the denitrification rate is 96%.The desulfurization performance is slightly better than the denitrification performance.The t90%of SO2 and NO(the time when desulfurization and denitrification rates reach 90%)is 10 min and 5 min respectively.The morphology and structure of the adsorbent were characterized by SEM,XRD and BET.The XRD results showed that the diffraction peaks of MgSO4,Ca(NO2)2 and CaSO4 exist in the samples after reaction.The kinetic analysis showed that the high efficiency desulfurization and denitrification stages,desulfurization conforms to the second-order kinetics and the interparticle diffusion model,while denitrification conforms to the interparticle diffusion model.While the overall desulfurization and denitrification stages,desulfurization conforms to the internal diffusion model and denitrification to the second-order kinetic model.The adsorbent with fly ash and calcium carbide slag as raw materials has excellent properties with very important environmental protection significance and economic application prospect.