Closing the carbon loop in Power-to-Fuel-to-Power systems using Ca(OH)2 as CO2 sorbent
Existing power-to-X-to-power (PtXtP) systems re-emit CO2 when X is a synthetic carbonaceous fuel, as it is uneconomical to capture the CO2 during the brief periods of operation when back-up power is produced by burning X with air. This work presents a new strategy to re-capture such CO2 by using as sorbent a large flow of stored Ca(OH)2, which is produced from a reservoir of CaCO3. This approach can bring to zero or even negative values the carbon footprints, in particular when the pure CO2 evolved from the CaCO3 calciner is recycled to the Power-to-fuel subsystem or stored permanently. The capture process decouples the CO2 capture and the sorbent regeneration steps by using an two intermediate storage systems of Ca(OH)2 and CaCO3. This allows to reduce the capacity of the elements related with the sorbent regeneration and the investment cost, thus minimizing the economic penalty. A basic analysis using information available related to commercial technologies for Calcium Looping and PtXtP systems yields round-trip efficiencies of 0.253 and avoided CO2 cost around 60 $/tCO2.
| Main Authors: | , , |
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| Other Authors: | |
| Format: | comunicación de congreso biblioteca |
| Language: | English |
| Published: |
2022
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| Subjects: | CO2 Capture, calcium looping, Ca(OH)2, Ensure access to affordable, reliable, sustainable and modern energy for all, Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation, |
| Online Access: | http://hdl.handle.net/10261/333301 |
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| Summary: | Existing power-to-X-to-power (PtXtP) systems re-emit CO2 when X is a synthetic carbonaceous fuel, as it is uneconomical to capture the CO2 during the brief periods of operation when back-up power is produced by burning X with air. This work presents a new strategy to re-capture such CO2 by using as sorbent a large flow of stored Ca(OH)2, which is produced from a reservoir of CaCO3. This approach can bring to zero or even negative values the carbon footprints, in particular when the pure CO2 evolved from the CaCO3 calciner is recycled to the Power-to-fuel subsystem or stored permanently. The capture process decouples the CO2 capture and the sorbent regeneration steps by using an two intermediate storage systems of Ca(OH)2 and CaCO3. This allows to reduce the capacity of the elements related with the sorbent regeneration and the investment cost, thus minimizing the economic penalty. A basic analysis using information available related to commercial technologies for Calcium Looping and PtXtP systems yields round-trip efficiencies of 0.253 and avoided CO2 cost around 60 $/tCO2. |
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