Abstract
The removal of acid gases, CO2 and H2 S from natural gas streams is essential for environmental and health reasons. In this work, the simulated gas sweetening unit with Methyl-DiEthanolAmine (MDEA) solvent was studied to improve quality. Firstly, the effect of trays types and then, the effect of various packing and the effect of the packing size were considered on the flow rate of CO2 and H2 S in the main streams. Results show that with considering the different trays types in the regenerator tower, the flow rate of CO2 in the sweet gas stream with bubble cap tray is lower than other trays types. Also, with considering the different trays types in the absorber tower, the flow rate of CO2 in the sweet gas stream with bubble cap tray is lower than other trays types in the absorber tower. In considering with different types of packing, results show that the flow rate of CO2 with ballast ring packing and the flow rate of H2 S with Raschig ring packing are lower than other types of packing. However, in some types such as cascade miniring, Intalox Saddles and pall ring, there is no difference for the flow rate of CO2 or H2 S. In all cases, with increasing the size of the packing, the flow rate of CO2 and H2 S in the sweet gas stream increases, however, this increasing in the metal packing is very small.
Highlights
The growing needs of the natural gas in many of the industry lead to improving the existing processes for welfare of the people, energy and pollution control
The regenerator tower was considered as a tower with bubble cap trays and the absorber tower was considered as a packed column and the effect of various packing, such as ballast ring, cascade mini ring, Intalox Saddles, pall rings, and Raschig rings and the effect of the packing size were considered on the flow rate of CO2 and H2S in the main streams
With considering the different trays types in the absorber tower, while in all these cases the bubble cap tray was used in the regenerator tower, it can be seen the flow rate of CO2 in the sweet gas stream with bubble cap tray is lower than other trays types in the absorber tower
Summary
The growing needs of the natural gas in many of the industry lead to improving the existing processes for welfare of the people, energy and pollution control. Many processes have been developed for the removal of CO2 and H2S from the natural gas in various operating conditions and various CO2 and H2S concentrations in the sour gas (Kohl and Nielsen, 1997; Processors, 2004; Rufford et al, 2012; Abdulrahman and Sebastine, 2013; Muhammad and GadelHak, 2014; Tavan and Tavan, 2014). Abdulrahman and Sebastine (2013) studied the effect of amine solvents types on the percent of CO2 and H2S in the sweet gas stream In their simulation, the optimization of process studied by using several amine types and blends of them, for example, MEA and MDEA. The simulated gas sweetening unit with MDEA solvent was studied to improve quality and increase efficiency In this unit, there are two towers, absorber and regenerator tower. The regenerator tower was considered as a tower with bubble cap trays and the absorber tower was considered as a packed column and the effect of various packing, such as ballast ring, cascade mini ring, Intalox Saddles, pall rings, and Raschig rings and the effect of the packing size were considered on the flow rate of CO2 and H2S in the main streams
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