摘要
天然气净化厂硫黄回收装置在停车期间存在尾气SO_(2)排放浓度增加且波动较大等问题。分析问题原因在于:1)传统燃料气燃烧除硫工艺的除硫热惰性气体流量小、除硫期间尾气SO_(2)排放浓度波动大;2)热氮除硫工艺局限大;3)碱法烟气脱硫工艺污水处理困难。基于上述原因提出了解决措施:1)硫黄回收装置停车期间严格按照风气比进行配风操作;2)在氮气充足的情况下,掺配吹扫氮气,增加过程气流量;3)利用现有尾气处理装置对SO_(2)进行碱吸洗;4)对尾气进行循环回收利用。上述措施可降低硫黄回收装置停车期间引起尾气SO_(2)排放浓度超高的风险,保证天然气净化厂硫黄回收装置停车期间装置外排尾气SO_(2)排放浓度满足国家环保要求。
In a natural gas purification plant,during shutdown period of the sulfur recovery unit,the concentration of SO_(2)in tail gas increases and fluctuates a lot.The causes of the above problem are:1)in the case of traditional process of fuel gas combustion to remove sulfur,the flow of hot inert gas is small;hence the concentration of SO_(2)in tail gas during the desulfurization period fluctuates significantly;2)the hot nitrogen desulfurization process has significant limitation;3)the alkaline flue gas desulfurization process has difficulties in its sewage treatment.This paper proposes SO_(2)reduction solutions during sulfur recovery unit shutdown period as follows:1)control the fuel gas and combustion air mixing ratio strictly;2)use higher nitrogen purging rate when there is plenty of nitrogen;3)make use of existing tail gas processing unit,add alkali to absorb SO_(2);4)recycle and reuse exhaust gas.The above proposals from the research study can reduce the risk of excessively high SO_(2)concentration in exhaust gas from the natural gas purification plant during shutdown period of the sulfur recovery unit,and ensure that the SO_(2)concentration of tail gas meets the national environmental protection requirements during such period.
作者
瞿杨
胡超
陈洪
许佳乐
唐兴波
徐飞
QU Yang;HU Chao;CHEN Hong;XU Jiale;TANG Xingbo;XU Fei(PetroChina Southwest Oil&Gasfield Company.Natural Gas Purification Plant,Chongqing,400021,China)
出处
《天然气与石油》
2021年第4期31-35,共5页
Natural Gas and Oil
基金
中国石油西南油气田公司科技项目“天然气净化装置停车操作SO 2排放技术研究”(20200306-10)。
关键词
硫黄回收
停车期间
SO_(2)
减排
Sulfur recovery
Shutdown period
SO_(2)
Emission reduction
