An examination on model of biogasification and methanation in waste incineration plants

Abstract

Toward the realization of carbon neutrality in 2050, methanation using waste-derived biogas and CO₂ and hydrogen derived from renewable energy is being studied. In this study, the potential of biomethane and synthetic methane obtained from waste incineration plants and their environmental performance were evaluated. In the evaluation, based on a general waste incineration plant (with power generation), there are 9 cases where a biogasification plant is attached, methanation is implemented (hydrogen is produced by surplus electricity or procured externally), and CO₂ recovered from incineration exhaust gas is used. We evaluated each one. As a result, when using CO₂ in the exhaust gas, the model that produces hydrogen with surplus electricity reduces the amount of CO₂ reduction, while the model that procures hydrogen externally increases the amount of CO₂ reduction. In addition, when using CO₂ in biogas, the amount of CO₂ reduction decreases in models that produce hydrogen using surplus electricity, while the model that procures hydrogen externally increases the amount of CO₂ reduction.