Simulation and improvement of biogas process using monoethanolamine solvent

Biogas is a sustainable energy source produced from organic waste. Raw biogas can be used to generate electricity, but since the energy content of biogas is directly related to methane concentration, it is necessary to improve the biogas and remove its carbon dioxide and other impurities to inject it into the gas grid. This article represents the biogas-improving process based on low-pressure steam compression, which is optimized with an expansion of the clean solvent exiting from the reboiler of the solvent recovery tower, and sending dense hot steam to the reboiler. Two common and optimal modes have been simulated by Aspan-Hasys software based on pure amine solvents. The obtained results showed an increase in the amount of carbon dioxide recovery, and a decrease in the heat load of the reboiler of the disposal tower to the amount of 3.62 GJ/tCO2, which is a 28.74% reduction compared to the base process.