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。

As for the high mercury-containing property of a gas field,VMGSim software is used to simulate the natural gas decarburization process at this gas field and the distribution of mercury in the decarbonization plant is studied.The results show that MDEA solution has a strong ability to absorb mercury in the feedstock gas,while mercury in MDEA rich liquid is also easily desorbed in the regeneration process,leading to that a large amount of mercury is enriched in regeneration gas at the top of regeneration tower.The effects of operating conditions such as reboiler temperature,temperature of lean MDEA solution into absorption tower,circulation of lean MDEA solution and concentration of lean MDEA solution on distribution of mercury in decarburization are studied.The distribution rule of mercury under different operating conditions is summarized.And it is suggested that the mercury removal unit in the high mercury-containing gas field similar to this gas field shall be set before the treatment process,which can effectively reduce the mercury hazards on the equipment and personnel.

张世坚(1992-),男,硕士生