为了研究汞在脱水脱烃单元中的分布规律，采用HYSYS软件对某含汞气田天然气处理厂脱水脱烃单元进行模拟，探究了原料气汞浓度、乙二醇循环量、乙二醇质量分数、低温分离器进料温度及压力等条件对汞分布的影响。研究表明，乙二醇对天然气中汞具有一定的吸收能力，可将原料气中约53.82%的汞转移至乙二醇富液中，乙二醇质量分数、乙二醇循环量越大，低温分离器进料温度越低，汞的转移量越大，外输气的汞含量越低。针对脱水脱烃单元汞污染问题，提出湿气脱汞流程及方案，原料气经装填有负载型金属硫化物的脱汞塔吸附，再送至脱水脱烃单元，从源头上防止脱水脱烃单元的汞污染。

In order to study the distribution rule of mercury in dehydration and dehydrocarbon units,HYSYS software is used to simulate the dehydration and dehydrocarbon units in a certain mercury-containing gas field natural gas treatment plant.Influences of the concentration of mercury in the feed natural gas,the circulating amount of ethylene glycol,the concentration of ethylene glycol,and the temperature and pressure of feed gas to low temperature separator on the distribution of mercury are investigated.It is found that ethylene glycol has a certain absorption capacity to mercury in natural gas and about 53.82% of mercury in the raw material gas can be transferred into ethylene glycol rich liquid.Higher ethylene glycol concentration,larger ethylene glycol circulation and lower feed gas temperature at the low-temperature separator all are helpful to increase the transfer amount of mercury and cut down the mercury content in external gas.Aiming at solving the problem of mercury pollution in dehydration and dehydrocarbon units,a process and scheme removing mercury from moisture is proposed,in which the raw material gas is adsorbed by the mercury removal tower loaded with supported metal sulfide and then sent to the dehydration and dehydrocarbon units,preventing the dehydration and dehydrocarbon units from mercury contamination.