摘要
汞是一种有毒的重金属,部分气田开采的天然气中均含有一定量的汞,天然气中的汞易因温度和压力发生变化,而在低温分离器、液烃三相分离器、乙二醇再生塔等设备和管道中富集,对设备、人身安全及环境造成危害。湿气脱汞能有效避免汞在整个工艺系统内的污染。化学吸附脱汞工艺在国内外天然气脱汞装置中已得到广泛应用,但对吸附剂的性能要求相对较高。进口脱汞吸附剂价格昂贵且在湿气脱汞上应用较多,国产脱汞吸附剂价格低廉但在湿气脱汞上应用相对较少。通过对脱汞吸附剂的机理分析,现场评价国内外天然气湿气脱汞吸附剂性能,对比国内外负载型金属硫化物脱汞吸附剂的动态吸附汞容量,分析其压力、温度、流量对脱汞效果的影响。研究结果可为今后天然气湿气脱汞吸附剂选型及设计参数优化提供参考。
Mercury is a toxic heavy metal.Some natural gas extracted from gas fields contains a certain amount of mercury.Mercury in natural gas is easily enriched in low-temperature separator,liquid hydrocarbon three-phase separator,ethylene glycol regeneration tower and other equipment and piping due to changes of temperature and pressure,causing harm to equipment,the environment and posing a threat to personal safety.The removal of mercury at the source from wet gas can effectively avoid mercury contamination in the whole gas processing system.Chemisorption mercury removal process is widely used in natural gas mercury removal facilities at home and abroad,but it requires relatively high adsorbent performance.Imported adsorbents are widely used in wet gas application but they are expensive,while domestic adsorbents are cheap but rarely used in wet gas application.This paper analyzed the mechanism of the mercury adsorbent,evaluated the on-site wet gas mercury adsorbent performance at home and abroad,compared dynamic mercury adsorption capacity of domestic and imported loaded metal sulfide mercury removal adsorbents,and also analyzed the influence of temperature,pressure,flow velocity on mercury removal efficiency.This research result can provide reference for future mercury adsorbent selection and design parameters optimization of wet natural gas mercury removal process.
作者
吴昊
WU Hao(Xinjiang Petroleum Engineering Co.,Ltd.,Karamay,Xinjiang,834000,China)
出处
《天然气与石油》
2021年第4期26-30,共5页
Natural Gas and Oil
基金
中国石油天然气股份有限公司科学研究与技术开发项目“天然气气质项目——含汞气田湿气脱汞技术试验研究”(KY2015-05)。
关键词
天然气脱汞
脱汞吸附剂
空塔流速
动态吸附汞容量
Mercury removal from natural gas
Mercury adsorbent
Empty tower velocity
Dynamic mercury adsorption capacity
