Comparison of Natural Gas Combined Cycle Power Plants with Post Combustion and Oxyfuel Technology at Different CO2 Capture Rates

Mletzko, Jan; Ehlers, Sören; Kather, Alfons

doi:10.1016/j.egypro.2016.01.001

Cited by 50 publications

(17 citation statements)

References 3 publications

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“…Figure shows a two-dimensional gradient of emissions from NGCC with CCS, assuming EIA heat rate, varying CO 2 capture efficiency from 80 to 100% (vertical axis), and methane emissions from 0 to 4% (horizontal axis), assuming GWP-100 = 29.8 (left panel) and GWP-20 = 82.5 (right panel). Note that this analysis does not account for increasing heat rate penalty for high capture rates . Emissions for an archetypical NGCC with CCS (90% capture, national average CH 4 emissions) are highlighted, at 0.14 kg of CO 2 e/kWh (GWP-100) and 0.30 kg of CO 2 e/kWh (GWP-20).…”

Section: Resultsmentioning

confidence: 99%

Contribution of Regionalized Methane Emissions to Greenhouse Gas Intensity of Natural Gas-Fired Electricity and Carbon Capture in the United States

Burns

Grubert

2021

Environ. Sci. Technol. Lett.

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Natural gas is a fossil fuel primarily comprised of methane, a powerful greenhouse gas. As such, both combustion and direct atmospheric emissions of natural gas contribute to climate change. Natural gas supply chain methane emissions vary substantially based on extraction region and processes, such that natural gas end users experience very different lifecycle greenhouse gas intensities even for similar uses. Methane emissions have relevant implications for decarbonization pathways that use natural gas to generate electricity (with or without carbon capture) or remove carbon dioxide from the atmosphere. This Letter combines state-specific estimates of the methane emissions intensity of natural gas supplies with generator-level modeling to estimate the contribution of methane emissions to the greenhouse gas intensity of natural gas-fired electricity and carbon capture in the United States. For existing electricity generation, state-specific methane emissions factors are matched to individual natural gas-fired generators to estimate the [minimum, maximum] range for the carbon dioxide equivalent contribution of methane (100-year global warming potential = 29.8) relative to direct carbon dioxide emissions by balancing authority ([15%, 48%]), utility ([13%, 48%]), and the North American Electric Reliability Corporation region ([16%, 36%]). Methane emissions constrain the greenhouse gas avoidance or removal potential of natural-gas-fired carbon capture.

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Section: Resultsmentioning

confidence: 99%

Contribution of Regionalized Methane Emissions to Greenhouse Gas Intensity of Natural Gas-Fired Electricity and Carbon Capture in the United States

Burns

Grubert

2021

Environ. Sci. Technol. Lett.

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“…Ninety-five percent of the CO 2 is captured using integrated post combustion CO 2 capture, that draws off steam from the steam cycle for sorbent regeneration. The specific energy requirement for post-combustion capture shows a sharp increase if the capture rate exceeds 90% (Mletzko et al, 2016), whereas the specific energy requirements for direct air capture are constant. The ratio of post-combustion capture and DAC where total energy losses are at their minimum was found to be 95% post-combustion capture and 5% DAC respectively.…”

Section: System Design and Life Cycle Inventory Analysismentioning

confidence: 97%

What Does It Take to Go Net-Zero-CO2? A Life Cycle Assessment on Long-Term Storage of Intermittent Renewables With Chemical Energy Carriers

2020

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The concept of net-zero-CO 2 power systems has gained increased attention by the EU goal to be a climate neutral continent by 2050. As potential pathways toward a net-zero-power system, this work analyzes future power systems based on intermittent renewable electricity with long-term storage through chemical energy carriers, so called Power-to-Fuel-to-Power systems, and a system based on the combustion of natural gas with 100% carbon capture and storage. The chemical energy carriers selected for electricity storage are hydrogen, methane and ammonia. Using life cycle assessment, we determine and compare the environmental impacts of 1 kWh of dispatchable electricity produced by the two pathways on seven impact categories. There was not one single pathway that had the most environmental benefits on all seven impact categories. Of the Power-to-Fuel-to-Power systems assessed the use of hydrogen for storage has the lowest environmental impact in all categories. Additionally, all the Power-to-Fuel-to-Power systems have a lower environmental impact on climate change, photochemical ozone formation and fossil resource depletion compared with the natural gas with carbon capture and storage system. The natural gas with carbon capture and storage system has a lower environmental impact on particulate matter formation, marine eutrophication and mineral resource scarcity. Our work is complemented by an analysis of pathways from a net-zero-direct-CO 2 to a life-cycle net-zero-CO 2 -equivalent power system which is actually climate neutral, achieved by direct air capture of the residual CO 2 from the atmosphere. However, this leads to an increase in all other impact categories of 11% for the Power-to-Fuel-to-Power systems and 21% in the natural gas combustion with carbon capture and storage system. A system sizing study also highlights the very low capacity factors of the capital employed for electricity storage, raising the point of economic feasibility.Keywords: energy storage, net-zero-CO 2 -emissions, direct air capture, intermittent renewable energy supply, CO 2 capture and storage, chemical energy carriers, hydrogen, CO 2 based fuels

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“…One solution could be the integration of carbon capture [9,10] e.g. including oxy-combustion [11,12], pre-combustion [13,14,15,16] and post-combustion [17,12,18] into natural gas power stations. Kvamsdal et al [10] showed the existence of several promising configurations in which a gas turbine cycle (400MWe) was coupled with a carbon capture process.…”

Section: Role Of Natural Gas Ccs and Beccs In The Power MIX By 2050mentioning

confidence: 99%

Natural gas and BECCS: A comparative analysis of alternative configurations for negative emissions power generation

Cumicheo

Dowell

Shah

2019

International Journal of Greenhouse Gas Control

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There is a reliance on negative emissions technologies (NETs), primarily in the form of Bioenergy with Carbon Capture and Storage (BECCS) in most Integrated Assessment Model (IAM) scenarios which are capable of limiting the maximum global temperature rise to 1.5-2 • C. Two currently independent features of transition pathways are fuel switching from coal to gas, and the deployment of BECCS. The former makes natural gas an important transition fuel which at the same time could be combined with biomass to further abate emissions. To date the majority of studies have considered BECCS in the context of a conversion from coal-fired base configuration. There is therefore a pressing need to identify routes for the effective utilisation of biomassderived fuels in the context of gas-fired power generation infrastructure. In this contribution, we study three distinct CCS-based processes which combine natural gas and biomass capable of producing low-, or carbon-negative power. Both fuel supply chains are considered in order to quantify the net CO 2 emissions. An important insight is the configuration-specific impact of biomass co-combustion on the overall carbon intensity of power generated. We found that an external biomass combustion configuration was the most carbon negative, removing between 0.5-1 ton of CO 2 per MWh of power generated. Results revealed a trade-off between carbon negativity and efficiency of the processes. The generation of net carbon negative power is observed to be highly sensitive to the carbon footprint of the biomass supply chain.

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Comparison of Natural Gas Combined Cycle Power Plants with Post Combustion and Oxyfuel Technology at Different CO2 Capture Rates

Cited by 50 publications

References 3 publications

Contribution of Regionalized Methane Emissions to Greenhouse Gas Intensity of Natural Gas-Fired Electricity and Carbon Capture in the United States

Contribution of Regionalized Methane Emissions to Greenhouse Gas Intensity of Natural Gas-Fired Electricity and Carbon Capture in the United States

What Does It Take to Go Net-Zero-CO2? A Life Cycle Assessment on Long-Term Storage of Intermittent Renewables With Chemical Energy Carriers

Natural gas and BECCS: A comparative analysis of alternative configurations for negative emissions power generation

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