Comprehensive analysis of a novel power and methanol coproduction process using landfill gas reforming and renewable hydrogen generation by an alkaline electrolyzer

This research presents a unique method for producing electricity and methanol simultaneously using landfill gas reforming and renewable hydrogen production. The suggested procedure offers a cheap cost of production, high energy and energy efficiency, and net zero carbon dioxide emissions. Alkaline electrolyzers, biogas partial oxidation reforming units, gas-steam cycle power plants, steam cycle power plants, and methanol synthesis units make up the recommended procedure. Findings revealed that the novel procedure's overall energy and exergy efficiencies are 48.71% and 53.62%, respectively. Additionally, it was shown that the gas-steam cycle power plant makes the largest contribution (56%) to the total exergy destruction (94403.36 kW), while the biogas partial oxidation reforming unit makes the smallest contribution (7%). The energy efficiencies of the biogas partial oxidation reforming unit, alkaline electrolyzer, gas-steam cycle power plant, steam cycle power plant, and methanol synthesis unit are also based on the completed studies and are, respectively, 82.12%, 85.06%, 76.59%, 19.78%, and 93.14%. The environmental analysis illustrated that using the steam cycle power plant and gassteam cycle power plant as well as integrated employment of heat sources are the main factors for achieving negative net carbon dioxide emission (-0.054 kgCO2 economic analysis revealed that the total cost of produced methanol equals 0.362 USDkg , which is lower than similar processes.