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针对某气田高含汞特性,采用VMGSim软件模拟该气田天然气脱碳工艺,并研究了汞在脱碳装置中的分布规律,发现MDEA溶液对原料气中的汞具有很强的吸收能力,同时在再生过程中,MDEA富液中的汞也易解吸出来,使得大量汞在再生塔塔顶再生气中富集。对重沸器温度、贫液进塔温度、贫液循环量及贫液浓度等操作条件对脱碳装置中的汞分布影响进行了研究,总结出不同操作条件下的汞分布规律。并建议类似该气田的高含汞气田采用“前脱”脱汞工艺,有效减小汞对设备及人员的危害。
Aiming at the high mercury content in a gas field, VMGSim software was used to simulate the natural gas decarburization process in this field. The distribution of mercury in the decarburization unit was also studied. It was found that MDEA solution had a strong absorption capacity for mercury in the feed gas. In the regeneration process, mercury in the MDEA rich liquid is also easily desorbed, so that a large amount of mercury is enriched in the regeneration gas at the top of the regeneration tower. Effects of operating conditions such as reboiler temperature, lean liquid inlet temperature, lean liquid circulation and lean liquid concentration on mercury distribution in the decarbonization unit were studied, and mercury distribution rules were summarized under different operating conditions. It is also suggested that a mercury-containing gas field similar to this gas field should be equipped with a mercury removal process that effectively reduces the hazards of mercury to equipment and personnel.