Distribution and prevention and control of mercury during the low temperature treatment process of natural gas

During the process of low temperature treatment, the natural gas containing mercury is easy to separate out in the form of liquid mercury, which will bring potential safety hazards to natural gas production. In addition, once the natural gas containing mercury enters the long-distance pipeline, it may also bring potential safety hazards to downstream users. The effects of low-temperature treatment process on mercury removal, the flow direction of mercury during the process of natural gas low-temperature treatment and the prevention and control methods were studied. The results showed that the low temperature treatment process had a strong removal effect on mercury. Most of the mercury in natural gas was separated out in the form of liquid mercury during the low temperature treatment process, and a small part entered into the external transportation gas. In order to eliminate the pollution of mercury to downstream, dry gas or wet gas mercury removal methods could be adopted to remove mercury from natural gas. The advantages of dry gas mercury removal method are that the performance of mercury adsorbent can be well guaranteed and the amount of the mercury adsorbent is small, and its disadvantage is that mercury precipitation exists during the process of low temperature treatment of natural gas, which will bring difficulties to maintenance. The advantage of wet gas mercury removal method is that it can effectively reduce mercury precipitation, and its disadvantage is that the amount of the mercury adsorbent is large. Users could make a reasonable choice according to their own production conditions.