期刊
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
卷 83, 期 -, 页码 186-194出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijggc.2019.02.011
关键词
Biogas upgrading; Biomethane; CH4; Water scrubbing absorption; Biofuels
类别
资金
- GM Green methane in the framework of the scientific consulting activity CNR IIA [0001517]
- Unita di ricerca per l'ingegneria agraria of the Consiglio per la Ricerca in agricolutura e l'analisi dell'Economia Agraria (CREA ING) [CNR IIA 0000369/2015, CRA 0010593/2015]
In biogas upgrading to biomethane, the release of CO2 off-gas into the atmosphere is generally regarded as a carbon-neutral emission, but a significant loss of CH4 can occur in this step: considering the global warming potential of this latter compound, methane slip can worsen or even nullify the CO2 savings associated to biomethane. This study investigates a novel approach for biogas upgrading to biomethane, aimed at reducing the methane loss. A plant based on hot potassium carbonate was fed with 150-200 Nm(3) h(-1) of biogas from municipal waste. CO2 is removed in a K(2)CO(3 )absorption column, with negligible CH4 absorption. An assessment of biomethane quality was performed to check its compliance with recent National and European standard specifications. Results show that a methane slip below 0.1% can be achieved with this technology, thus significantly reducing the greenhouse gas emissions associated to biomethane industry. This leads to a lower capital expenditure because no off-gas post-treatment is required. Heat and electricity consumption were monitored, and operational expense resulted to be lower than membrane separation in the specific case study, by applying life cycle cost (LCC) methodology.
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