有色金属科学与工程2026，Vol.17Issue(1)：47-55,9.DOI:10.13264/j.cnki.ysjskx.2026.01.006
亚硫酸镁-亚硫酸钠湿法脱硫体系的热力学分析
Thermodynamic analysis of wet desulfurization system with a mixture of magnesium sulfite and sodium sulfite
摘要
Abstract
Based on thermodynamic equilibrium calculations,this study examines the absorption of SO2 by both the slurry and clear liquor of a magnesium sulfite and sodium sulfite mixture,respectively.The results show that pure magnesium sulfite slurry has an initial pH of 8.99,but the equilibrium concentration of sulfite capable of desulfurization in the solution reaches only 0.056 mol/L.In contrast,when magnesium sulfite,sodium sulfite,and magnesium hydroxide are mixed,the initial pH increases with higher sodium sulfite concentrations,while the final pH after the sulfite desulfurization reaction decreases to 4.55.The mixed slurry of magnesium sulfite and sodium sulfite significantly increases the sulfite concentration in solution,thereby maintaining a high SO2 absorption capacity even as the pH decreases.If a clear mixed liquor of magnesium sulfite and sodium sulfite is used,no solid precipitation forms during the desulfurization,thus avoiding pipeline blockage.Nevertheless,the sodium sulfite concentration in the clear liquor must remain sufficiently high to ensure adequate SO2 absorption capacity,as the desulfurization capacity declines significantly when the pH falls below 6.Based on these thermodynamic analyses,a two-stage absorption and two-stage regeneration process is proposed for the magnesium sulfite sodium sulfite clear liquor desulfurization system.关键词
烟气/二氧化硫/镁法脱硫/钠法脱硫/热力学分析Key words
flue gas/sulfur dioxide/magnesium-based desulfurization/sodium-based desulfurization/thermodynamic analysis分类
矿业与冶金引用本文复制引用
钟敏,席海龙,曹才放,吕亚航,熊菲,吴珊珊..亚硫酸镁-亚硫酸钠湿法脱硫体系的热力学分析[J].有色金属科学与工程,2026,17(1):47-55,9.基金项目
江西省重点研发计划资助项目(20192ACB70017) （20192ACB70017）
金川集团技术开发项目(金科冶2024-02) （金科冶2024-02）
