不同天然气处理装置的汞分布研究

Study on mercury distribution in different natural gas treatment plants

选取国内3个高含汞气田的天然气处理装置作为研究对象,采用VMGSim软件对烃水露点控制装置、三甘醇脱水装置以及活化MDEA脱碳装置进行了汞分布模拟。研究表明,醇类对汞元素有一定的吸收作用,且不同的醇类吸收效果不同。乙二醇对汞有一定的富集作用,三甘醇对含汞天然气中的汞吸收效果很弱,MDEA醇胺溶液对汞具有很强的吸附作用。天然气处理厂进行汞污染控制的根本措施是设置脱汞单元,当天然气中汞含量较高(>50μg/m^3)时,通常对不同天然气处理装置采取湿气脱汞方案。

Taking the natural gas treatment plants in three high mercury-containing gas fields as study objects,the VMGSim software is used to simulate the mercury distributions on the hydrocarbon water dewpoint control device,the triethylene glycol dehydration device and the activated MDEA decarburization device. The results show that glycols have certain absorption on mercury,different glycols have the different absorption effects. Ethylene glycol can make a certain collection of mercury,triethylene glycol absorbs weakly mercury in mercury-containing natural gas,whereas the MDEA solution has a strong adsorption on mercury.The provision of mercury removal units is the fundamental measure for natural gas treatment plants to control mercury pollution. If the mercury content in natural gas is high（〉 50 μg·m^-3）,the mercury removal scheme under moisture gas status is usually employed for different natural gas treatment plants.