关键词: 溶剂再生装置, 流程模拟, 能量, N-甲基二乙醇胺

Abstract: A solvent regeneration unit for N-Methyldiethanolamine (MDEA) recovery is simulated using the AMINE package in PRO/II software based on a detailed analysis of solvent regeneration mechanism. The effect of the flash temperature of rich amine on the removal of H2S and dissolved hydrocarbons is focused, as well as the effect of temperature/position of rich amine fed to the regeneration column, the reflux temperature and the H2S content in rich/lean amine on the energy consumption of the unit is investigated. Finally, optimized operation parameters are proposed as follows: the feeding temperature of rich amine to the regeneration column should be in the range of 90-100 ℃ and the inlet should be located at the 1st tray, the temperature of the acid gas separator at the top of the column is supposed to be 45-50 ℃, and the H2S content in the lean amine should be controlled at about 0.15 % for energy saving. However, ensuring the temperature of rich amine fed to the regeneration column is not affected, reasonably increase the 2nd stage heat exchange load of lean-rich amine streams before the flash drum will be helpful for the removal of dissolved hydrocarbons in rich amine, yet the operating temperature of the flash drum should be kept in the range of 65-70 ℃.

Key words: Solvent regeneration unit, process simulation, energy, N-Methyldiethanolamine (MDEA)