基于GB 39728-2020的硫磺回收装置尾气达标排放改造对比分析

Comparative analysis of tail gas up-to-standard emission transformation of sulfur recovery unit based on GB 39728-2020

关键词:  GB 39728-2020  天然气  硫磺回收  尾气处理  污染物  SO₂  达标排放

Key words:  GB 39728-2020  natural gas  sulfur recovery  tail gas treatment  pollutant  SO₂  up-to-standard emission

摘要:

目的 随着GB 39728-2020《陆上石油天然气开采工业大气污染物排放标准》的正式发布,天然气净化装置克劳斯及其延伸类硫磺回收工艺必须增加尾气处理装置才能满足排放标准的要求。通过探索增设尾气处理工艺运行过程的调整方法,减少对天然气净化厂运行的影响,使尾气排放达标。方法 通过对增设尾气处理装置运行前后硫磺回收装置的系统回压、处理负荷、公用辅助装置的运行造成影响的对比分析,重点阐述了硫磺回收装置开停车的影响,统计了新建尾气处理装置对天然气净化装置增加的生产成本,指导调整装置运行。结果 增设尾气处理工艺后,尾气中SO₂排放浓度大幅度降低,完全满足排放标准的要求,有效解决了硫磺回收装置开停车过程中尾气SO₂排放浓度较高的问题。结论 通过统计分析增设尾气处理工艺对天然气净化厂生产运行的影响,为尾气处理工艺在天然气净化厂的应用总结经验,使装置达到高效、环保、平稳运行。 

Abstract:

Objective With the official release of the GB 39728-2020 Emission standard of air pollutants for onshore oil and gas exploitation and production industry, the tail gas treatment unit must be added to the Claus and its extended sulfur recovery process of natural gas purification unit to meet the requirements of emission standards. By exploring the adjustment method of adding tail gas treatment process operation process, the influence on the operation of purification plant was reduced to realize the tail gas up-to-standard emission. Methods Through the comparative analysis of the influence of system back pressure, treatment load and the operation of public auxiliary device of sulfur recovery unit before and after the operation of the additional tail gas treatment unit, the influences of the start-up and shutdown of the sulfur recovery unit were emphatically expounded. The increased production cost of new tail gas treatment unit on natural gas purification plant was counted to guide and adjust the unit operation. Results After adding tail gas treatment process, the SO₂ emission concentration in tail gas was greatly reduced, which can fully meet the requirements of emission standards. The problem of high SO₂ emission concentration in tail gas during the start-up and shutdown of sulfur recovery unit was effectively solved. Conclusion sThrough statistical analysis of the impact of adding tail gas treatment process on the production and operation of natural gas purification plants, the experience is summarized for the application of tail gas treatment process in natural gas purification plants, so that the units can achieve efficient, environmentally friendly and stable operation.