Abstract
Techno-economic development of chemical looping combustion (CLC) process has been one of the most pursued research areas of the present decade due to its ability to reduce carbon foot print during utilization of coal to generate energy. Based on a 2D computational fluid dynamics model, the present work provides a computational approach to study the effect of operating pressure—a key parameter in designing of CLC reactors, on optimum operating conditions. The effects of operating pressure have been examined in terms of reactors temperature, percentage of fuel conversion and purity of carbon dioxide in fuel reactor exhaust. The simulated results show qualitative agreement with the trends obtained by other investigators during experimental studies.
Highlights
Escalation of greenhouse gas emission and its contribution towards global warming due to prevalent power generation technologies using fossil fuels is a burning problem for mankind
Result obtained from the 2D Computational fluid dynamics (CFD) simulation study of chemical looping combustion (CLC) process using metallurgical coke (MC) and sub-bituminous coal (SBC) as fuels are discussed
An increase in operating pressure increases the purity of carbon dioxide while, it decreases the percentage fuel conversion when SBC is used as a fuel
Summary
Escalation of greenhouse gas emission and its contribution towards global warming due to prevalent power generation technologies using fossil fuels is a burning problem for mankind. Abad et al (2013) developed a mathematical model, only for the fuel reactor, to determine the effect of key parameters such as reactor temperature, solids circulation rate and solid inventory on the efficiency of carbon dioxide capture. They validated their simulated results against a 100 kWth chemical looping combustion unit. Jin et al (2009) developed CFD model for chemical looping combustion using hydrogen as fuel and CaSO4 as an oxygen carrier incorporating reaction kinetics They studied the effects of partial pressure of hydrogen on the system performance and concluded that higher partial pressure accelerated the reaction rate. The simulated results showed a qualitative agreement with the results obtained by different investigators during study of the effect of operating pressure on different segments of the CLC process (Lee et al 1991; Labiano et al 2006; Xiao et al 2010; Abad et al 2013)
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