硫磺回收装置停工热氮除硫工艺研究

Study on hot nitrogen sulfur removal process during shutdown of sulfur recovery unit

关键词:  硫磺回收  热氮除硫  SO₂  尾气  停工

Key words:  sulfur recovery  hot nitrogen sulfur removal  sulfur dioxide  tail gas  shutdown

摘要:

目的 降低硫磺回收装置停工除硫期间尾气中SO₂排放量。方法 对比传统燃料气除硫及热氮除硫工艺的技术特点、原理及优缺点,采用Aspen Plus软件进行模拟计算,并结合热氮除硫工艺的技术特点,对3个阶段的除硫流程进行优化操作。结果 通过对比分析及Aspen Plus软件模拟计算结果可知,热氮除硫技术可降低硫磺回收装置停工期间的SO₂排放量,将排放尾气中SO₂质量浓度控制在400 mg/m³以下。结论 采用热氮除硫工艺可解决硫磺回收装置停工除硫期间尾气SO₂排放量大的问题,但也存在N₂消耗量大、停工除硫时间长等问题。今后,在优化N₂消耗量、缩短停工除硫时间的基础上,热氮除硫技术将会得到推广应用。 

Abstract:

Objective To reduce the SO₂ emission during the shutdown of sulfur recovery unit for desulfurization. Methods The technical features, theories, advantages and disadvantages of conventional fuel gas desulfurization and hot nitrogen desulfurization process were compared. Aspen Plus software is used to simulate the calculation and optimize the operation of desulfurization flow during three stages after considering the characteristics of hot nitrogen sulfur removal process. Results The comparative analysis and Aspen Plus software simulated calculation showed that hot nitrogen sulfur removal process could reduce the SO₂ emission of sulfur recovery unit during the shutdown period and control the emission mass concentration of SO₂ below 400 mg/m³. Conclusion sApplying the hot nitrogen sulfur removal process can solve the problem of large SO₂ emission in tail gas of sulfur recovery unit during shutdown for sulfur removal, but problems still exist such as high nitrogen consumption and long duration of shutdown for sulfur removal. By optimizing nitrogen consumption and shortening the duration of shutdown for sulfur removal, the hot nitrogen sulfur removal process will be promoted and applied.