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Research Papers: Energy Systems Analysis

Energy and Exergy Analyses of a Power Plant With Carbon Dioxide Capture Using Multistage Chemical Looping Combustion

[+] Author and Article Information
Bilal Hassan, Oghare Victor Ogidiama, Mohammed N. Khan

Institute Center for Energy (iEnergy),
Department of Mechanical and
Materials Engineering,
Masdar Institute of Science and Technology,
Masdar City 54224, Abu Dhabi, UAE

Tariq Shamim

Institute Center for Energy (iEnergy),
Department of Mechanical and
Materials Engineering,
Masdar Institute of Science and Technology,
Masdar City 54224, Abu Dhabi, UAE
e-mail: tshamim@masdar.ac.ae

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received April 13, 2016; final manuscript received October 19, 2016; published online November 10, 2016. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 139(3), 032002 (Nov 10, 2016) (9 pages) Paper No: JERT-16-1170; doi: 10.1115/1.4035057 History: Received April 13, 2016; Revised October 19, 2016

Abstract

A thermodynamic model and parametric analysis of a natural gas-fired power plant with carbon dioxide (CO2) capture using multistage chemical looping combustion (CLC) are presented. CLC is an innovative concept and an attractive option to capture CO2 with a significantly lower energy penalty than other carbon-capture technologies. The principal idea behind CLC is to split the combustion process into two separate steps (redox reactions) carried out in two separate reactors: an oxidation reaction and a reduction reaction, by introducing a suitable metal oxide which acts as an oxygen carrier (OC) that circulates between the two reactors. In this study, an Aspen Plus model was developed by employing the conservation of mass and energy for all components of the CLC system. In the analysis, equilibrium-based thermodynamic reactions with no OC deactivation were considered. The model was employed to investigate the effect of various key operating parameters such as air, fuel, and OC mass flow rates, operating pressure, and waste heat recovery on the performance of a natural gas-fired power plant with multistage CLC. The results of these parameters on the plant's thermal and exergetic efficiencies are presented. Based on the lower heating value, the analysis shows a thermal efficiency gain of more than 6 percentage points for CLC-integrated natural gas power plants compared to similar power plants with pre- or post-combustion CO2 capture technologies.

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Figures

Fig. 1

Schematic representation of a generalized CLC cell

Fig. 2

Schematic representation of the CLC-based natural gas power plant used in the current study

Fig. 3

The power plant configuration represented in Aspen Plus flow sheet. CLC cells are shown as gray circuits.

Fig. 4

Effect of incoming fuel mass flow rate on key plant temperatures

Fig. 5

Effect of incoming fuel mass flow rate on plant efficiencies

Fig. 6

Effect of feed air mass flow rate on key plant temperatures

Fig. 7

Effect of feed air mass flow rate on plant efficiencies

Fig. 8

Effect of OC (metal) mass flow rate on key plant temperatures

Fig. 9

Effect of OC (metal) mass flow rate on plant efficiencies

Fig. 10

Effect of CLC operating pressure on key plant temperatures

Fig. 11

Effect of CLC operating pressure on plant efficiencies

Fig. 12

Effect of extent of exhaust waste heat recovered on key plant temperatures

Fig. 13

Effect of extent of exhaust waste heat recovered on plant efficiencies

Fig. 14

Effect of inactive inert concentration within OC on plant cumulative work output and thermal efficiency

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