摘要
【目的】基于环境与双碳战略的需求,对高炉煤气进行脱硫以实现炼铁行业的清洁生产势在必行。分子筛吸附剂因操作简便、运行成本低、再生性能好,而具有良好的应用前景。【方法】选用LTA、MFI和FAU三种类型的沸石分子筛,通过固定床实验装置测定了其脱除高炉煤气中H_(2)S的性能,并通过XRD、N2吸附-脱附、FT-IR和ICP-AES等表征分析了其物理化学结构特性,建立了物化性质与脱硫性能间的构效关系;揭示了CO_(2)和H_(2)O对H_(2)S脱除性能的影响,并探究了分子筛吸附剂在不同温度、空速等条件下的工况适应性。【结果】结果表明,FAU型分子筛相较于LTA、MFI具有优良的脱硫性能,穿透硫容高达1.67 g/100 g。微孔沸石分子筛比介孔沸石分子筛对H_(2)S的吸附性能更好,在选用的三种沸石分子筛中较低的硅铝比有利于分子筛吸附剂脱硫性能的提升。高炉煤气中的CO_(2)和H_(2)O均会与H_(2)S产生竞争吸附,从而造成分子筛脱硫性能的降低;由于H_(2)O和H_(2)S分子结构相似且均为极性分子,因而具有更强的竞争吸附,对脱硫性能影响更大。此外,分子筛吸附剂随着温度的升高其脱硫性能随之下降,随空速的增加其脱硫性能略有增加,这为沸石分子筛吸附剂在高炉煤气脱硫技术中的应用提供了数据支撑。
【Purposes】With the needs of environment and the dual-carbon strategy,the desulfurization of blast furnace gas is of great significance to achieve cleaner production in the iron-making industry.Zeolite adsorbents have good application prospects because of their easy operation,low operating cost,and good regeneration performance.【Methods】In this study,three types of zeolite,LTA,MFI,and FAU,were selected and their performances of removing H_(2)S from blast furnace gas were evaluated through fixed bed experiments,and their physicochemical characteristics were analyzed by characterization methods such as XRD,N2 adsorption-desorption,FT-IR,and ICP-AES.And the constitutive relationship between physicochemical properties and desulfurization performances was established.In addition,the influences of CO_(2) and H_(2)O gases on the desulfurization performance were revealed,and the adaptability of zeolite adsorbent to the working conditions with different temperatures and air velocities was investigated.【Results】The results show that FAU-type zeolite has better desulfurization performance over LTA and MFI,with a breakthrough sulfur capacity of 1.67 g/100 g.The zeolite with lower n(Si)/n(Al)among the three zeolites is beneficial to desulfurization.CO_(2) and H_(2)O gases in blast furnace gas compete with H_(2)S for adsorption,thus causing a decrease in the desulfurization performance of the zeolite adsorbents.The molecular structures of H_(2)O and H_(2)S are similar and they are both polar molecules,which makes H_(2)O a strong competor of H_(2)S and has a great impact on the desulfurization performance.In addition,the desulfurization performance of zeolite adsorbents decreases with temperature and increases slightly with space velocity.This work provides data support for the application of zeolite adsorbents in the field of blast furnace gas desulfurization.
作者
郭燕
李宇杰
常丽萍
廖俊杰
马静红
GUO Yan;LI Yujie;CHANG Liping;LIAO Junjie;MA Jinghong(State Key Laboratory of Clean and Efficient Coal Utilization,Taiyuan University of Technology,Taiyuan,Shanxi,China;Key Laboratory of Coal Science and Technology of Ministry of Education,Taiyuan University of Technology,Taiyuan University of Technology,Taiyuan,Shanxi,China;College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan,Shanxi,China;Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering,Taiyuan,Shanxi,China)
出处
《太原理工大学学报》
北大核心
2025年第6期1200-1207,共8页
Journal of Taiyuan University of Technology
基金
山西浙大新材料与化工研究院科研项目(2022SX-TD014)
山西省高等学校科技创新项目。
关键词
分子筛
脱硫
高炉煤气
竞争吸附
工况适应性
zeolite
desulphurization
blast furnace gas
competitive adsorption
adaptability to the working conditions
