SNG production typically involves several key processes, including gasification, methanation, and gas purification.
1. Gasification: The initial step involves converting raw feedstock (like coal or biomass) into syngas, a mixture of hydrogen (H2), carbon monoxide (CO), and other components. This process occurs at high temperatures in the presence of a controlled amount of oxygen or steam.
2. Methanation: The syngas undergoes a catalytic reaction known as methanation to produce methane (CH4), the principal component of SNG. Catalysts, often based on nickel, are crucial in facilitating this reaction under specific temperature and pressure conditions.
3. Gas Purification: The resultant gas mixture contains impurities like sulfur compounds, CO2, and water vapor, which need to be removed to meet the quality standards of pipeline-grade natural gas.
