关键词: 天然气净化, DEA法脱酸, TEG法脱水, 工艺优化, 层次分析法

Abstract: In order to avoid severe corrosion of vessel or freezing in cryogenic exchangers, feed gas from natural gas well heads containing various contaminants and acid gases cannot be sent to the liquefaction unit directly, and must pass through purification units to remove undesirable components such as CO₂, H₂S and H₂O. In this paper, DEA and TEG methods are adopted to remove such components, and these two methods are coupled into a natural gas purification process to reach the purification target. As the project handbook only gives the approximate range of process parameters, an optimal process is not available. This paper first applies software HYSYS 8.4 to simulate the natural gas purification process based on relevant data. Then nine combined cases are listed according to the recommended range of process parameters, and a system assessment method, Analytic Hierarchy Process (AHP), is introduced. Finally, multi-objective comprehensive assessment is made using AHP in Matlab to select the optimal process parameters. This approach can provide reference for optimization of natural gas purification process and other processes.

Key words: natural gas purification process, DEA method, TEG method, optimization, AHP