Integration of heat recirculating microreactors with thermoelectric modules for power generation: a comparative study using CFD

Literature Information

Publication Date 2021-09-17
DOI 10.1039/D1RE00382H
Impact Factor 4.239
Authors

Neha Yedala, Niket S. Kaisare


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Abstract

Heat recirculating microreactors are being investigated for coupling with thermoelectric generators (TEGs) for power generation since they facilitate sustained combustion over a wide range of operating conditions. A major challenge in autothermal operation of the integrated microdevice is to sustain stable combustion in the presence of energy consuming devices and heat sinks, while operating below the temperature limitation of the TEG module. Although heat recirculation improves stability, proper thermal management and optimum heat recycling are necessary to meet these challenges. Hence, two heat recirculating geometries, viz. the U-bend and symmetric-heat recirculating reactor (S-HRR), are considered for integration with TEG modules and their performances as coupled devices at steady state are compared. We analyze the effect of heat recirculation in the U-bend and S-HRR geometries on the performance of the coupled devices, with power generated, fuel conversion, and extinction velocities as the performance metrics. A higher area is available for exchange of excess enthalpy between products and reactants in the S-HRR, resulting in stability at a lower equivalence ratio and higher propane conversion than in the U-bend. The impact of increased heat removal on the cold side is investigated, the performance of the reactors is compared, and the preferred operating regions for the two geometries are identified.

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Source Journal

Reaction Chemistry & Engineering

Reaction Chemistry & Engineering
CiteScore: 0
Self-citation Rate: 8.8%
Articles per Year: 284

Reaction Chemistry & Engineering is an interdisciplinary journal reporting cutting-edge research focused on enhancing the understanding and efficiency of reactions. Reaction engineering leverages the interface where fundamental molecular chemistry meets chemical engineering and technology. Challenges in chemistry can be overcome by the application of new technologies, while engineers may find improved solutions for process development from the latest developments in reaction chemistry. Reaction Chemistry & Engineering is a unique forum for researchers whose interests span the broad areas of chemical engineering and chemical sciences to come together in solving problems of importance to wider society. All papers should be written to be approachable by readers across the engineering and chemical sciences. Papers that consider multiple scales, from the laboratory up to and including plant scale, are particularly encouraged.

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