Abstract
Our objective through this work is to purify the biogas produced by a methanisation process in order to be valorized in a cogeneration unit. The studied biogas is mainly composed of methane 60% and carbon dioxide 39%. The treatment will increase the quality of the biogas by decreasing the percentage of CO2, in order to improve the energetic properties of the gas mixture (PCI). Several biogas purification and bio-methane production processes are commercialized. The choice of the technical and economic optimum is strongly linked to the quality and quantity of biogas to be purified, the quality of the desired bio-methane, depends on the type of methanisation, the nature and regularity of the substrate supply, but also on the local conditions of implantation. In this part of our research project, we are interested in the study, dimensioning and modeling of a CO2 capture unit by chemical absorption, constituted by a packed column. The solvent used is the secondary amines in mixture with the primary amines.
Highlights
Biogas is produced from organic waste, through a natural methanisation process in an anaerobic environment, which degrades organic matter through the combined action of several types of micro-organisms
Taking into account the composition of the raw gas, the separation task consists of the removal of CO2 drying of the gas, removal of trace compounds such as oxygen, nitrogen, hydrogen sulphide, ammonia, and compression to a set pressure depending on the end use of the gas [1]
CO2 capture by chemical absorption requires a separation column in which material transfer is promoted by a large contact surface between the liquid and the gas
Summary
Biogas is produced from organic waste, through a natural methanisation process in an anaerobic environment, which degrades organic matter through the combined action of several types of micro-organisms. Biogas treatment is a separation task that leads to the production of a methane-rich gas with technical specifications. CO2 capture by chemical absorption requires a separation column in which material transfer is promoted by a large contact surface between the liquid and the gas. Absorption columns are generally tray or packed columns This is an operation in which a mixture of gases is brought into contact with a liquid solvent in order to solubilize one or more components of the mixture [2]. Alcanolamine solutions are the most commonly used in acid gas absorption processes. The resulting process simulation and evaluation environment was coupled with a non-linear optimization method to determine the operating parameters and equipment dimensions that maximize energy and economic performance [2]
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