Carbon Capture and Storage Workshop, Texas A&M University in Qatar
  • ISSN: 2220-2765
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Fossil fuel-based power generation technologies with and without CO  capture offer a number of alternatives, which involve different fuel production and supply, power generation and capture routes with varied energy consumption rates and subsequent environmental impacts. The holistic perspective offered by Life Cycle Assessment (LCA) can help decision makers to quantify the trade-offs inherent in any change to the fuel supply and power production systems and ensure that a reduction in greenhouse gas (GHG) emissions does not result in increases in other environmental impacts. Beside energy and non-energy related GHG releases, LCA also tracks various other environmental emissions, such as solid wastes, toxic substances and common air pollutants, as well as the consumption of resources, such as water, minerals and land use. In this respect, the dynamic LCA model developed at Imperial College incorporates fossil fuel production, transportation, power generation, CO  capture, CO  conditioning, pipeline transportation and CO  injection and storage, and quantifies the environmental impacts at the highest level of detail, allowing for the assessment of technical and geographical differences between the alternative technologies considered. The life cycle inventory (LCI) databases that were developed, model the inputs and outputs of the processes at component or unit process level, rather than “gate-to-gate” level, and therefore generate reliable LCI data in a consistent and transparent manner, with a clearly arranged and flexible structure for long-term strategic energy system planning and decision-making.

The presentation discussed the principles of the LCA models developed and the newly extended models for the natural gas-fired power generation, with alternative CO  capture systems. Additionally, the natural gas supply chain LCA models, including offshore platform gas production, gas pipeline transportation, gas processing, liquefied natural gas (LNG) processes, LNG shipping and LNG receiving terminal developed are used to estimate the life cycle GHG emissions for an idealised case study of natural gas production in Qatar, LNG transportation to a UK natural gas terminal and use in a power plant. The scenario considers a conventional and three alternative CO  capture systems, transport and injection of the CO  offshore in the Irish Sea.


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