Impact of Flue Gas Species and Temperature on Mercury Oxidation

• Published in: Tsinghua science and technology Vol. 15; no. 4; pp. 418 - 425
• Main Author: 陶叶 禚玉群 张亮 陈昌和 徐旭常
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.08.2010
• Subjects: HCl; mercury speciation; SO 2; temperature; 反应器系统; 气体成分; 氧化过程; 氮氧化物; 温度范围; HCl; mercury speciation; temperature; SO 2; NO
• ISSN: 1007-0214; 1878-7606; 1007-0214
• DOI: 10.1016/S1007-0214(10)70082-1

Systematic experimental research has been conducted in a fixed-bed reactor system to determine the impact of coal-fired flue gas species and temperature on mercury oxidation. This work focuses on the temperatures range of 200℃ to 800℃ to demonstrate that temperature is a critical factor for the effect of the gas components on the mercury oxidation process. Among the investigated gases, hydrogen chloride is es- sential for oxidizing the elemental mercury. Nitrogen oxide was also found to have a positive correlation with the mercury oxidation when hydrogen chloride was present. Sulfur dioxide can either promote or inhibit the oxidation depending on the conditions; however, when nitrogen oxide is also present, sulfur dioxide has a negative impact. Ammonia exhibits an strong inhibitory effect. Several plausible mercury oxidation pathways are suggested in this paper.