Experimental Investigation of Removal of SO3 from Flue Gas with Modified Fly Ash Adsorbents

作者：Guiling Xu, Feihan Chen, Yangjie Qian, Ping Lu, Miaomin Hong, Qi Zhang, Qiang Zhou · 发表于：ACS Omega · 年份：2023 · DOI：10.1021/acsomega.2c07476 · 被引用次数：9 · 研究领域：Industrial Gas Emission Control、Catalytic Processes in Materials Science、Carbon Dioxide Capture Technologies

High Resolution Image Download MS PowerPoint Slide The removal of nonconventional pollutants in coal-fired power plants, such as SO 3, has been receiving more and more attention. However, due to its unique nature, it is difficult to remove SO 3 effectively with the widely used wet flue gas desulfurization systems. Nowadays, dry-sorbent injection technology has become a promising method for SO 3 emission control in coal-fired power plants. The removal characteristics of SO 3 from flue gas with modified fly ash adsorbents were investigated in a fixed-bed reactor. Factors affecting the adsorption efficiency of SO 3 were studied, including modification method, modified fly ash adsorbent particle size, reaction temperature, and flue gas component. Combined with adsorbent characterization analysis, the adsorption kinetics of SO 3 by modified fly ash adsorbents were carried out with four different adsorption kinetics models. The results show that the SO 3 adsorption efficiency of the fly ash samples increases after modification; the best SO 3 removal performance of fly ash was achieved when 1.5 mol/L NaOH solution was used, with the highest SO 3 adsorption efficiency of up to 98.3%. The modified fly ash adsorbent particle size, water vapor content, and the addition of NO have little effect on the adsorption efficiency of SO 3 . As the reaction temperature increases from 250 to 450 °C, the SO 3 adsorption efficiency first increases and then decreases, with an optimal reaction tempera...