Dear Community Members,
I belong to an education sector and recently I am making simulation models for an oil and gas company. The company is performing gas sweetening process using DGA solvent. The feed input to unit I am simulating is free from H2S and only contains CO2 gas (H2S is removed earlier in another unit). Energy consumption (reboiler + Overhead condenser + cooler + Pumping) came out to be 10.7 GJ/ton of CO2 captured. Many Carbon capture and storage (CCS) related studies report CO2 capture energy within 2.5 - 4.2 GJ/ton of CO2 captured.
I am just wondering why this energy consumption difference is so big (10.7 GJ/ton VS 4.2 GJ/ton CO2)?
What is the usual industrial figure for acid gas sweetening energy penalty?
CCS related numbers are mostly based on power plant flue gas composition, does the increased energy penalty in natural gas sweetening case has to do with the presence of Hydrocarbons?
Any insight in this issue will be appreciated.
Thank you.