Life Cycle Assessment of Natural Gas Combined Cycle Integrated with CO2 Post Combustion Capture using Chemical Solvent

  • Stephen Olubunmi Fadeyi

Student thesis: Master's Thesis

Abstract

Considering the consequences of global warming and the need to take drastic step to cutting down its impact by capturing the CO2 from stationary sources, environmental performance of CO2 capture is vital to deploying any of the available technologies. Life cycle assessment methodology is used in this study to evaluate the impacts associated with the CO2 capture from a natural gas combined cycle by using scientific approach of process design and sizing of important unit operations. An environmental assessment of 90% and 80% CO2 capture with conventional monoethanolamine (MEA) and advance solvent (KS-1) at different compression configuration and pressures of CO2 product was considered. The results show a major reduction in greenhouse gas emission (GHG) for both capture efficiencies. For the 90% CO2 capture with conventional MEA for all the compression configuration, a reduction of 76% in GHG emission was achieved while the 80% CO2 capture with conventional MEA show a reduction of 65% in GHG emission. The KS-1 solvent show a reduction of 78% in GHG emission due to reduced energy required for regeneration of CO2. However, the assessment shows that CO2 capture leads to an increment in other environmental impacts such as human toxicity potential, abiotic depletion, marine eutrophication potential, fresh water aquatic ecotoxicity, marine aquatic ecotoxicity, acidification, terrestrial ecotoxicity and photochemical oxidation. These impacts are majorly due to additional energy required for the CO2 capture, infrastructures and chemical solvent used. The KS-1 solvent shows a clear advantage over the conventional MEA in all the environmental assessment categories.
Date of Award2013
Original languageAmerican English
SupervisorMohammad Abu Zahra (Supervisor)

Keywords

  • Global Warming
  • CO2 Capturing
  • Green House Effect.

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