FeCeLaO/粉煤灰基SiO_(2)-Al_(2)O_(3)中低温烟气脱砷及抗硫性能  

Middle-Low-temperature Flue Gas Arsenic Removal and Sulfur Resistance Performance of FeCeLaO/Fly Ash-based SiO_(2)-Al_(2)O_(3)

作　　者：王凯[1] 张凯华[1] 张锴[1] WANG Kai;ZHANG Kaihua;ZHANG Kai(Beijing Key Laboratory of Pollutant Monitoring and Control in Thermoelectric Production Process,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学热电生产过程污染物监测与控制北京市重点实验室,北京102206

出　　处：《动力工程学报》2025年第4期602-611,共10页Journal of Chinese Society of Power Engineering

基　　金：国家重点研发计划资助项目(2020YFB0606201);国家自然科学基金委与山西煤基低碳联合基金重点资助项目(U1910215)。

摘　　要：采用碱熔-酸洗法对粉煤灰表面进行改性,制备活性Si-Al载体,同时以Fe、Ce、La复合氧化物为活性组分,采用共沉淀法制备FeCeLaO/活性Si-Al载体复合吸附剂,通过X射线荧光光谱、比表面积测定、X射线衍射图谱等对吸附剂进行表征,进而研究温度、Si/Al质量分数比、FeCeLaO负载率对复合吸附剂脱砷和抗硫中毒能力的影响。结果表明:活性Si-Al载体的脱砷能力随Si/Al质量分数比的增大和吸附温度的升高均先升高后降低,最佳Si/Al质量分数比为1.85,此时脱砷效率最高为78.7%,为原灰的2.8倍;最佳吸附温度位于高温段600℃,此时脱砷效率为84.8%;而FeCeLaO/活性Si-Al载体复合吸附剂最佳吸附温度位于中低温段400℃,脱砷效率高达96.9%,活性组分最佳负载率为1∶1。活性Si-Al载体的抗硫中毒能力随Si/Al质量分数比的增大而增强;引入FeCeLaO活性组分,有利于增强吸附剂的抗硫中毒能力,且负载率越高,抗硫中毒能力越强;FeCeLaO/活性Si-Al氧化物抗硫中毒能力强的原因主要是SiO_(2)的表面酸性和Ce元素对Fe、La、Al等活性组分的保护效应。The surface of fly ash was modified using an alkali fusion-acid washing method to prepare an active Si-Al carrier.And Fe,Ce,La composite oxides were used as the active components to prepare FeCeLaO/active Si-Al carrier composite adsorbent by co-precipitation method.The adsorbents were characterized by X-ray fluorescence spectroscopy(XRF),specific surface area measurements,and X-ray diffraction(XRD)patterns.Effects of temperature,Si/Al mass ratio,FeCeLaO loading ratio on arsenic removal efficiency and sulfur poisoning resistance of the composite adsorbent were investigated.Results show that the arsenic removal capacity of active Si-Al carrier increases first and then decreases with the increase of Si/Al mass ratio and adsorption temperature.The optimal Si/Al mass fraction ratio is 1.85,achieved a maximum arsenic removal efficiency of 78.7%,which is 2.8 times higher than that of raw fly ash.The highest removal efficiency of 84.8%is located in the high temperature range of 600℃.The best adsorption temperature of FeCeLaO/active Si-Al carrier composite adsorbent is located in the middle and low temperature section of 400℃,the arsenic removal efficiency is as high as 96.9%,and the best loading ratio of active components is 1∶1.The anti-sulfur poisoning ability of active Si-Al carriers is enhanced with the increase Si/Al mass fraction ratio.The introduction of FeCeLaO active component is conducive to the enhancement of the antisulfur poisoning ability of the adsorbent,and the higher the loading ratio,the stronger the anti-sulfur poisoning ability.The reason for the strong anti-sulfur poisoning ability of FeCeLaO/active Si-Al oxides is mainly due to the surface acidity of SiO_(2) and the protective effect of elemental Ce on the active components,such as Fe,La,Al,etc.

关 键 词：砷 吸附 粉煤灰 FeCeLaO 抗硫中毒 

分 类 号：TM61[电气工程—电力系统及自动化]