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Operating flexibility of natural gas combined cycle power plant integrated with post-combustion capture
https://orcid.org/0000-0003-4661-8124
https://orcid.org/0000-0003-2211-7157
Highlights Solvent storage can increase the operating envelope of gas fired CCS power plants by +/-10% of net electricity output. Solvent storage can decouple electricity and CO2 output for up to 3 h with 6200m3 of additional solvent inventory. Controlled extraction by throttling the low pressure turbine of the combined cycle is the preferred strategy for delayed solvent regeneration. Delayed solvent regeneration has an additional electricity output penalty of 420–450 kW h/tCO2 with this operating strategy. Regeneration time for 1 h of solvent storage operation can be as fast as 2.1 hs with the same operating strategy.
Abstract Highly flexible, low-carbon electricity generation with gas-fired power stations with CO2 capture addresses the challenges of balancing variable renewable electricity supply in low carbon electricity systems. This detailed technical assessment of flexible CO2 capture plant operation at natural gas combined cycle power stations with post-combustion CO2 capture examines the operating strategies of capture plant by-pass and interim solvent storage. We show that solvent storage allows expanding the operating envelope of gas fired CCS power stations by +/-10%. Further we demonstrate that electricity and CO2 output can be decoupled for up to 3 h with approx. 6000 m3 of additional solvent inventory for the purpose of reducing the CO2 flow variability in downstream transportation and storage systems, mitigating potentially deleterious injection well effects. 1 h of solvent storage operation at full load can be regenerated in as fast as 2.1 h during continuous operation of the CCS power plant by choosing a controlled steam extraction strategy from the combined cycle and thus throttling the low pressure turbine. The electricity output penalty associated with the delayed regeneration of solvent ranges from 420–450 kWh/tCO2 with this strategy, which compares to 380 kWh/tCO2 for immediate regeneration at full load design conditions. By deploying a novel variable speed drive integrally geared compressor model, we find that, unlike previously thought, an uncontrolled steam extraction strategy, referred as a floating steam extraction strategy, can lead to choking of the CO2 compressor during additional solvent regeneration. A pre-compression stage would be necessary under this extraction strategy to restore feasible operation of the main CO2 compressor, and makes this strategy more complex to implement. When decreasing the desorber pressure at part-load care must, therefore, be taken to respect the operating limits of the compressor. To assist with the use of rigorous plant performance data in wider electricity system models, correlations for key performance parameters of NGCC-CCS power plants at varying load, with capture by-pass and additional solvent regeneration are provided.
Operating flexibility of natural gas combined cycle power plant integrated with post-combustion capture
https://orcid.org/0000-0003-4661-8124
https://orcid.org/0000-0003-2211-7157
Highlights Solvent storage can increase the operating envelope of gas fired CCS power plants by +/-10% of net electricity output. Solvent storage can decouple electricity and CO2 output for up to 3 h with 6200m3 of additional solvent inventory. Controlled extraction by throttling the low pressure turbine of the combined cycle is the preferred strategy for delayed solvent regeneration. Delayed solvent regeneration has an additional electricity output penalty of 420–450 kW h/tCO2 with this operating strategy. Regeneration time for 1 h of solvent storage operation can be as fast as 2.1 hs with the same operating strategy.
Abstract Highly flexible, low-carbon electricity generation with gas-fired power stations with CO2 capture addresses the challenges of balancing variable renewable electricity supply in low carbon electricity systems. This detailed technical assessment of flexible CO2 capture plant operation at natural gas combined cycle power stations with post-combustion CO2 capture examines the operating strategies of capture plant by-pass and interim solvent storage. We show that solvent storage allows expanding the operating envelope of gas fired CCS power stations by +/-10%. Further we demonstrate that electricity and CO2 output can be decoupled for up to 3 h with approx. 6000 m3 of additional solvent inventory for the purpose of reducing the CO2 flow variability in downstream transportation and storage systems, mitigating potentially deleterious injection well effects. 1 h of solvent storage operation at full load can be regenerated in as fast as 2.1 h during continuous operation of the CCS power plant by choosing a controlled steam extraction strategy from the combined cycle and thus throttling the low pressure turbine. The electricity output penalty associated with the delayed regeneration of solvent ranges from 420–450 kWh/tCO2 with this strategy, which compares to 380 kWh/tCO2 for immediate regeneration at full load design conditions. By deploying a novel variable speed drive integrally geared compressor model, we find that, unlike previously thought, an uncontrolled steam extraction strategy, referred as a floating steam extraction strategy, can lead to choking of the CO2 compressor during additional solvent regeneration. A pre-compression stage would be necessary under this extraction strategy to restore feasible operation of the main CO2 compressor, and makes this strategy more complex to implement. When decreasing the desorber pressure at part-load care must, therefore, be taken to respect the operating limits of the compressor. To assist with the use of rigorous plant performance data in wider electricity system models, correlations for key performance parameters of NGCC-CCS power plants at varying load, with capture by-pass and additional solvent regeneration are provided.
Operating flexibility of natural gas combined cycle power plant integrated with post-combustion capture
https://orcid.org/0000-0003-4661-8124
https://orcid.org/0000-0003-2211-7157
Highlights Solvent storage can increase the operating envelope of gas fired CCS power plants by +/-10% of net electricity output. Solvent storage can decouple electricity and CO2 output for up to 3 h with 6200m3 of additional solvent inventory. Controlled extraction by throttling the low pressure turbine of the combined cycle is the preferred strategy for delayed solvent regeneration. Delayed solvent regeneration has an additional electricity output penalty of 420–450 kW h/tCO2 with this operating strategy. Regeneration time for 1 h of solvent storage operation can be as fast as 2.1 hs with the same operating strategy.
Abstract Highly flexible, low-carbon electricity generation with gas-fired power stations with CO2 capture addresses the challenges of balancing variable renewable electricity supply in low carbon electricity systems. This detailed technical assessment of flexible CO2 capture plant operation at natural gas combined cycle power stations with post-combustion CO2 capture examines the operating strategies of capture plant by-pass and interim solvent storage. We show that solvent storage allows expanding the operating envelope of gas fired CCS power stations by +/-10%. Further we demonstrate that electricity and CO2 output can be decoupled for up to 3 h with approx. 6000 m3 of additional solvent inventory for the purpose of reducing the CO2 flow variability in downstream transportation and storage systems, mitigating potentially deleterious injection well effects. 1 h of solvent storage operation at full load can be regenerated in as fast as 2.1 h during continuous operation of the CCS power plant by choosing a controlled steam extraction strategy from the combined cycle and thus throttling the low pressure turbine. The electricity output penalty associated with the delayed regeneration of solvent ranges from 420–450 kWh/tCO2 with this strategy, which compares to 380 kWh/tCO2 for immediate regeneration at full load design conditions. By deploying a novel variable speed drive integrally geared compressor model, we find that, unlike previously thought, an uncontrolled steam extraction strategy, referred as a floating steam extraction strategy, can lead to choking of the CO2 compressor during additional solvent regeneration. A pre-compression stage would be necessary under this extraction strategy to restore feasible operation of the main CO2 compressor, and makes this strategy more complex to implement. When decreasing the desorber pressure at part-load care must, therefore, be taken to respect the operating limits of the compressor. To assist with the use of rigorous plant performance data in wider electricity system models, correlations for key performance parameters of NGCC-CCS power plants at varying load, with capture by-pass and additional solvent regeneration are provided.
Operating flexibility of natural gas combined cycle power plant integrated with post-combustion capture
Spitz, Thomas (Autor:in) / González Díaz, Abigail (Autor:in) / Chalmers, Hannah (Autor:in) / Lucquiaud, Mathieu (Autor:in)
International Journal of Greenhouse Gas Control ; 88 ; 92-108
28.04.2019
17 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Valuing power plant flexibility with CCS: the case of post-combustion capture retrofits
| Online Contents | 2011