Sustainability of geothermal energy: handling co-produced gas
conference paper
The greenhouse gas emissions resulting from gas which is co-produced together with geothermal brine can be mitigated in various ways. Keeping the system under pressure is an effective method for low gas-to-liquid ratios (0.33 Nm3/m3), in particular if some gas (< 1%) is acceptable in the surface system. Burning the gas in a combined heat and power plant (CHP) in combination with carbon capture is not cost effective: if one or two geothermal wells are considered the relatively small scale of the carbon capture plant leads to very high cost per ton of stored CO2. Also the variability of the CO2-stream resulting from the variability in heat demand leads to additional cost due to over dimensioning of the capture system. In case of a high amount of gas in the brine and a high methane fraction within the gas, selling the methane in combination with separating the CO2 from the methane using carbon capture is cost effective.
Topics
TNO Identifier
982265
ISBN
9781713863618
Publisher
European Association of Geoscientists and Engineers EAGE
Source title
3rd EAGE Global Energy Transition, GET 2022, 7 November 2022, The Hague, The Netherlands
Pages
51-55
Files
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