A Shortcut Method to Predict Particle Size Changes during Char Combustion and Gasification under regime II Conditions

Document identifier: oai:DiVA.org:ltu-76792
Access full text here:10.1080/00102202.2019.1678919
Keyword: Engineering and Technology, Mechanical Engineering, Energy Engineering, Teknik och teknologier, Maskinteknik, Energiteknik, Combustion, Gasification, Char conversion, Biomass, Particle size change
Publication year: 2019
Abstract:

In most industrial applications, combustion and gasification of char progresses under regime II conditions. Unlike in other regimes, both particle size and density change simultaneously in regime II due to non-uniform consumption of carbon inside the particles. In this work, mathematical predictions of diameter changes in regime II were made by a one-dimensional simulation tool, where transient species balances are resolved locally inside the particle. This simulation is computationally expensive and usually not appropriate for the implementation in comprehensive CFD simulations of combustion or gasification processes. To overcome this restraint, an alternative shortcut method with affordable computation time has been developed and validated against the detailed model. This method allows the calculation of diameter changes during combustion and gasification from precalculated effectiveness factors. Additionally, the change of particle size has been investigated experimentally in a single particle converter setup. Therein, particles are fixed on a sample holder placed in the hot flue gas of a flat flame burner. Size and temperature trends are optically assessed by a 3CCD camera.

Authors

Thobias Kreitzberg

Institute of Heat and Mass Transfer, RWTH Aachen University, Aachen, Germany
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Aekjuthon Phounglamcheik

Luleå tekniska universitet; Energivetenskap
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Nils Erland L. Haugen

Department of Thermal Energy, SINTEF Energy Research, Trondheim, Norway
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Reinhold Kneer

Institute of Heat and Mass Transfer, RWTH Aachen University, Aachen, Germany
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Kentaro Umeki

Luleå tekniska universitet; Energivetenskap
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