YU Haiyan,LYU Juan,SONG Wuchun,JIANG Dongxu,MA Xiaohui,CHEN Haiyan,LIN Longyuan

(Key Laboratory of Solid Waste Treatment and Resource Recycle,Ministry of Education,School of Environment and Resource, Southwest University of Science and Technology,Mianyang 621010,China)

Abstract：SO₂ is one of the most harmful air pollution sources at present.In order to control the emission of SO₂ exceeding the standard,a variety of desulfurizers have been studied.The desulfurization effect of fly ash modified has been greatly improved.Sink beads are a special kind of microbeads that can be separated from fly ash.They are similar to fly ash in chemical composition and have stronger “pozzolanic activity”than conventional fly ash.In order to explore the influence of modified sink beads on the adsorption efficiency of SO₂ removal,the mineral composition and particle morphology of the modified sink beads before and after modification were compared and analyzed,and the adsorption efficiency of the modified sink beads and the traditional Ca(OH)₂ desulfurizer for SO₂ removal was experimentally studied on the simulated dry flue gas desulfurization experimental platform.The results show that the modified sink beads have larger surface area and more pores than the original ones,which is conducive to improving the efficiency of adsorption and removal of SO₂ from flue gas.The sink beads are modified to produce calcium silicate hydrate,calcium aluminate hydrate,calcium silicaluminate hydrate and other products.The desulfurization efficiency of Ca(OH)₂ and the modified sink beads is compared and analyzed.The desulfurization efficiency of Ca(OH)₂ decreased significantly with the passing of time,the highest desulfurization rate is 93.5%,while the desulfurization efficiency of the modified sink beads is stable,the highest desulfurization rate is up to 100% and lasted for 80 min,and the desulfurization effect is obviously better than that of Ca(OH)₂.

Keywords：flue gas desulfurization;desulfurization efficiency;modification;sink beads

Get Citation:YU H Y,LYU J,SONG W C,et al.Effects of modified sink beads on the efficiency of SO₂ removal by adsorption[J].China Powder Science and Technology,2023,29(3)：110-116.

Received： 2022-08-01,Revised：2022-12-07,Online：2023-04-19 09:48。

Funding Project： 国家自然科学基金项目,编号 ：11402218;四川省科技计划项目,编号 ：2020YFG0186。

First Author：喻海艳(1996—),女,硕士研究生,研究方向为环境工程。E-mail：243681328@qq.com。

Corresponding Author：陈海焱(1964—),男,教授,博士,研究方向为气流粉碎、气流分级与通风除尘技术。E-mail：chenhai-yan@163com。