Ma Shuangchen, Xu Fang, Qiu Dao, Fan Shuaijun, Wang Ruimin, Li Yang, Chen Xiangyang
Hebei Key Laboratory of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding, People's Republic of China.
Moe Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, People's Republic of China.
J Air Waste Manag Assoc. 2022 Feb;72(2):131-146. doi: 10.1080/10962247.2021.2010620. Epub 2022 Jan 10.
As a trace element, selenium can cause serious harm to organisms when the concentration is too high. Coal-fired power plants are the main source of man-made selenium emissions. How to control the selenium pollution of coal-fired power plants to realize the renewable selenium and the sustainability of coal has not attracted enough attention from the whole world. This paper outlines the conversion and occurrence of selenium in coal-fired power plants. A small part of the selenium produced by combustion can be removed by selective catalytic reduction (SCR) and electrostatic precipitator (ESP) after the gas phase undergoes physical condensation and chemical adsorption to combine with the particulate matter in the flue gas.Because the chemical precipitation method has poor selenium removal effect, the remaining part enters the flue gas desulfurization absorption tower and can be enriched in the desulfurization slurry. The occurrence situation and conversion pathway of selenium in desulfurization slurry are introduced subsequently, the research progress of selenium removal from wet desulfurization wastewater is reviewed from three aspects: physics, biology and chemistry. We believe that the coupling application of oxidation-reduction potential (ORP) and pH can optimize selenium removal in the desulfurization system by improving the oxidation control. As a technology for wet desulfurization system to treat selenium pollution, it has a good development prospect in near future. Selenium is a trace element present in coal. It is not only of great significance to the life activities of organisms, but also a kind of rare resource. As the most important source of man-made emissions, coal-fired power plants will cause waste of selenium resources and selenium pollution in the surrounding environment. In this study, the occurrence, conversion and control of selenium in coal-fired power plants were systematically sorted out and analyzed. It is helpful for scholars to study the selenium transformation process more deeply. It is of great significance for policy formulation of recommended control technologies and emission limits. It is of great value for the formulation of recommended control technology and the in-depth study of the selenium transformation process.
作为一种微量元素，当浓度过高时，硒会对生物体造成严重危害。燃煤电厂是人为硒排放的主要来源。如何控制燃煤电厂的硒污染以实现硒的回收利用和煤炭的可持续性，尚未引起全球足够的关注。本文概述了燃煤电厂中硒的转化与赋存情况。燃烧产生的一小部分硒在气相经过物理冷凝和化学吸附与烟气中的颗粒物结合后，可通过选择性催化还原（SCR）和静电除尘器（ESP）去除。由于化学沉淀法的除硒效果较差，其余部分进入烟气脱硫吸收塔，并可在脱硫浆液中富集。随后介绍了脱硫浆液中硒的赋存情况和转化途径，从物理、生物和化学三个方面综述了湿法脱硫废水除硒的研究进展。我们认为，氧化还原电位（ORP）和pH的耦合应用可以通过改善氧化控制来优化脱硫系统中的硒去除。作为一种用于湿法脱硫系统处理硒污染的技术，它在不久的将来具有良好的发展前景。硒是煤中存在的一种微量元素。它不仅对生物体的生命活动具有重要意义，也是一种稀有资源。作为人为排放的最重要来源，燃煤电厂会造成硒资源的浪费和周边环境的硒污染。在本研究中，对燃煤电厂中硒的赋存、转化和控制进行了系统的梳理和分析。这有助于学者更深入地研究硒的转化过程。对于推荐控制技术和排放限值的政策制定具有重要意义。对于推荐控制技术的制定和硒转化过程的深入研究具有重要价值。
