硫磺回收装置烟气排放超标原因分析及对策

Cause analysis and countermeasures of discharged flue gas of sulfur recovery unit exceeding standard

关键词:  硫磺回收  达标排放  原因分析  治理措施  保护环境

Key words:  sulfur recovery  up-to-standard emission  cause analysis  control measure  protect environment

摘要:

分析了金澳科技(湖北)化工有限公司2×10⁴ t/a硫磺回收装置排放烟气中SO₂含量超标的原因,并采取了相应的改造措施,主要包括:①将液硫池废气由尾气炉改至燃烧炉；②更换更高效的脱硫溶剂；③更换有机硫水解能力更强的催化剂；④在尾气吸收塔后串联1台尾气碱洗塔。在实施①②③及优化工艺参数的前提下,排放烟气中SO₂质量浓度小于100 mg/m³。 

Abstract:

This paper analyzed the reasons for exceeding standard of sulfur dioxide mass concentration in discharged flue gas from 20×10³ t/a sulfur recovery unit of Kingao (Hubei) Science & Technology Chemical Industry Co., Ltd. Corresponding revamping measures were adopted, which included:(1) Introducing the off gas from liquid sulfur tank to the combustion furnace; (2) using desulfurization solvent with better desulfurization performance; (3) using catalysts with better organic sulfur hydrolysis ability; (4) adding a caustic wash tower cascaded to the tail gas absorber. After implementing the former measures (1)(2)(3) and adjusting the local process parameters, the SO₂ mass concentration in discharged flue gas was less than 100 mg/m³.