天然气脱汞工艺及优选OA

There are various processes for mercury removal from natural gas.Mastering the characteristics of different mercury removal processes is of great significance for process selection and achieving low-cost and efficient mercury removal from natural gas.Based on the analysis of the characteristics of different natural gas mercury removal processes,this study provides recommendations for process selection under different mercury concentration control targets.The low-temperature separation mercury removal process has a strong capability to remove mercury from natural gas,but the removal efficiency is limited.Additionally,mercury removal is required for ethylene glycol regenerated gas and alcohol-hydrocarbon liquid flash gas.Moreover,a large amount of liquid mercury precipitates in the low-temperature process,polluting equipment and causing maintenance difficulties.Study results show that when the mercury concentration control target is 28 μg/m3,non-regenerable wet gas mercury removal processes can be used for natural gas with low-high and mid-high mercury content to eliminate mercury contamination as close to the front as possible in the processing plant.For natural gas with ultra-high mercury content,to reduce the consumption of non-regenerable mercury removal agents,a combination of low-temperature separation and non-regenerable mercury removal processes or regenerable mercury removal processes can be used.When the mercury concentration control target is 0.01 μg/m3,it is recommended to use dry gas chemical mercury removal process to avoid the adverse effects of liquid water and hydrocarbons on the performance of mercury adsorbent.Due to the limited experience in natural gas mercury removal both domestically and internationally,this study provides valuable guidance for the design of natural gas mercury removal projects.