煤中含的硫和汞在气化过程中会迁移至气体、废水和气化渣中,造成环境污染。硫和汞具有很强的亲和力,科学认识这2种元素在气化过程中的迁移规律,进而提出科学的调控方法意义重大。本研究利用固定床性能评价装置考察了不同工况条件下气化渣对Hg0的吸附性能,并通过N2吸附-脱附、SEM、XPS等表征手段揭示了硫和汞在气化渣表面的反应特性。研究结果表明,硫和汞主要富集在细渣表面,细渣具有良好的Hg0吸附性能,且物理吸附起主导作用。进一步研究发现,气化渣表面未燃碳含量越高、矿物质含量越多,气化渣表面硫和汞的反应活性越好。此外,气氛也会影响气化渣的汞吸附性能。这些发现为煤气化渣的高值化资源化利用提供了新思路,为合成气中硫和汞的协同脱除提供了理论指导和研究基础,有助于推动清洁煤技术的可持续发展。

During the gasification process, sulfur and mercury in coal can migrateinto gas, wastewater, and gasification slag causingenvironmental pollution. Sulfur and mercury have strong affinities, and understanding the migration behavior of these elements duringgasification is of great significance for proposing scientific control methods. In this study, the adsorption properties of Hg on gasificationslag under different working conditions are investigated by a fixed bed performance evaluation device, and the reaction characteristics ofsulfur and mercury on the surface of gasification slag are revealed by N2 adsorption-desorption, SEM, XPS, and other characterizationmethods. The results show that sulfur and mercury are mainly concentrated on the surface of fine slag, which has good Hg adsorptionperformance, and physical adsorption plays a leading role. It is found that the higher the content of unburned carbon and minerals, thebetter the reactivity of sulfur and mercury on the surface of gasification slag. In addition, the atmosphere also affects the Hg adsorptionperformance of the gasification slag. These findings provide a new idea for the high-value resource utilization of coal gasification slag, andalso provide theoretical guidance and research basis for the collaborative removal of sulfur and mercury in syngas, thus contributing to thesustainable development of clean coal technology.