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 gas-steam cycle power plant as well as integrated employment of heat sources are the main factors for achieving negative net carbon dioxide emission (−0.054 [Formula presented]), and the process has a significant advantage. Finally, the economic analysis revealed that the total cost of produced methanol equals 0.362 [Formula presented], which is lower than similar processes.