硫黄回收装置停车期间SO2减排技术探讨
Discussion on SO2 emission reduction technology during shutdown of sulfur recovery unit
浏览(509) 下载(27)
- 引用格式:
-
瞿杨,胡超,陈洪,唐兴波,徐飞.硫黄回收装置停车期间SO2减排技术探讨[J].天然气与石油,2021,39(4):31-35.doi:10.3969/j.issn.1006-5539.2021.04.006
QU Yang, HU Chao, CHEN Hong, XU Jiale, TANG Xingbo, XU Fei.Discussion on SO2 emission reduction technology during shutdown of sulfur recovery unit[J].Natural Gas and Oil,2021,39(4):31-35.doi:10.3969/j.issn.1006-5539.2021.04.006
- DOI:
- 10.3969/j.issn.1006-5539.2021.04.006
- 作者:
- 瞿杨 胡超 陈洪 唐兴波 徐飞
QU Yang, HU Chao, CHEN Hong, XU Jiale, TANG Xingbo, XU Fei
- 作者单位:
- 中国石油西南油气田公司天然气净化总厂, 重庆 400021
PetroChina Southwest Oil & Gasfield Company. Natural Gas Purification Plant, Chongqing, 400021, China
- 关键词:
- 硫黄回收;停车期间;SO2;减排
Sulfur recovery; Shutdown period; SO2; Emission reduction
- 摘要:
- 天然气净化厂硫黄回收装置在停车期间存在尾气SO2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SO2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SO2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SO2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SO2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 SO2 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 SO2 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 SO2 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 SO2; 4)recycle and reuse exhaust gas. The above proposals from the research study can reduce the risk of excessively high SO2 concentration in exhaust gas from the natural gas purification plant during shutdown period of the sulfur recovery unit, and ensure that the SO2 concentration of tail gas meets the national environmental protection requirements during such period.
