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Integrated liquid fuel based chemical looping combustion – parametric study for efficient power generation and CO2 capture.

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Title: Integrated liquid fuel based chemical looping combustion – parametric study for efficient power generation and CO2 capture.
Authors: Adnan, Muflih A.1, Azis, Muhammad Mufti1, Quddus, Mohammad R.1, Hossain, Mohammad M.1 mhossain@kfupm.edu.sa
Source: Applied Energy. Oct2018, Vol. 228, p2398-2406. 9p.
Subjects: Liquid fuels, Combustion, Renewable energy sources, Carbon dioxide, Emission control
Abstract: Graphical abstract Highlights • An integrated liquid fuel gasification-CLC-power generation system is developed in Aspen Plus. • Addition of air supply and inert ratio has a considerable effect on process performance. • Pressure has an adverse effect on the performance of the combined CLC process. • The increase of split ratio of producer gas into the combustor enhances process efficiency. Abstract This study investigates an integrated Chemical Looping Combustion (CLC) based power generation system capturing CO 2 with an electrical efficiency of up to 55%. The integrated model is developed using Aspen Plus®, considering fuel oil as a liquid fuel. It consists of (i) a gasification island, (ii) a CLC island, (iii) heat recovery units, and (iv) power generation turbines. The gasification island is employed to ensure reforming of heavy hydrocarbon molecules into easily combustible syngas (CO, H 2). In order to improve the electrical efficiency, a fraction of the gasified fuel is directly fed (bypassed CLC) to a combustor located prior to the gas turbine. The model is evaluated by comparing the CLC island performance with that of the available literature results [28]. The developed model displays good accuracy, with maximum error limit of 3.1%. The integrated model prediction shows that the addition of air supply ratio (from 5 to 9) and inert ratio (from 0.3 to 0.7) can increase the overall efficiency of the process (from 40% to 47%). The efficiency reduces to 31% when the system pressure is increased from 8 to 16 bars. An increase of the split ratio of the producer gas into the combustor (up to 0.15) increases the efficiency (up to 55%). However, the corresponding CO 2 emission rises up to 0.10 kg CO 2 /kW. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Graphical abstract Highlights • An integrated liquid fuel gasification-CLC-power generation system is developed in Aspen Plus. • Addition of air supply and inert ratio has a considerable effect on process performance. • Pressure has an adverse effect on the performance of the combined CLC process. • The increase of split ratio of producer gas into the combustor enhances process efficiency. Abstract This study investigates an integrated Chemical Looping Combustion (CLC) based power generation system capturing CO 2 with an electrical efficiency of up to 55%. The integrated model is developed using Aspen Plus®, considering fuel oil as a liquid fuel. It consists of (i) a gasification island, (ii) a CLC island, (iii) heat recovery units, and (iv) power generation turbines. The gasification island is employed to ensure reforming of heavy hydrocarbon molecules into easily combustible syngas (CO, H 2). In order to improve the electrical efficiency, a fraction of the gasified fuel is directly fed (bypassed CLC) to a combustor located prior to the gas turbine. The model is evaluated by comparing the CLC island performance with that of the available literature results [28]. The developed model displays good accuracy, with maximum error limit of 3.1%. The integrated model prediction shows that the addition of air supply ratio (from 5 to 9) and inert ratio (from 0.3 to 0.7) can increase the overall efficiency of the process (from 40% to 47%). The efficiency reduces to 31% when the system pressure is increased from 8 to 16 bars. An increase of the split ratio of the producer gas into the combustor (up to 0.15) increases the efficiency (up to 55%). However, the corresponding CO 2 emission rises up to 0.10 kg CO 2 /kW. [ABSTRACT FROM AUTHOR]
ISSN:03062619
DOI:10.1016/j.apenergy.2018.07.072