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Detailed analysis of reacting particles in an entrained-flow gasifier

Richter, A. and Vascellari, M. and Nikrityuk, P. A. and Hasse, C. (2016):
Detailed analysis of reacting particles in an entrained-flow gasifier.
In: Fuel Processing Technology, Elsevier, pp. 95 - 108, 144, ISSN 0378-3820, DOI: 10.1016/j.fuproc.2015.12.014, [Online-Edition: http://dx.doi.org/10.1016/j.fuproc.2015.12.014],
[Article]

Abstract

Abstract For the development of reliable numerical models of entrained flow gasifiers it is crucial to understand and to model correctly the interactions between the hot gas-flow and the coal particles undergoing pyrolysis and char conversion. In this work a laboratory-scale entrained flow coal gasifier was investigated numerically. Based on the detailed analysis of the particle trajectories, the interaction between the flow field and coal particles of different sizes was carefully discussed and analyzed. For small, medium, and large particles, the primary regions for devolatilization, oxidation, and gasification were detected, and the conversion behavior for these particle fractions was quantified in terms of pyrolysis time, residence time, and overall conversion rate. Additional particle-resolved {CFD} calculations were carried out for representative particles of different sizes in order to study the heat and mass transfer of the isolated particles in detail. Pyrolyzing coal particles and combusting or gasifying char particles were considered at several positions in the reactor, where each location is characterized by different gas compositions and temperatures. For these particles, the flow field, and the species and temperature distributions in the boundary layer are discussed. The particle-resolved calculations demonstrate the impact of the particle Reynolds number and the influence of the mass flow from the particle to the surrounding gas on the overall heat and mass transfer.

Item Type: Article
Erschienen: 2016
Creators: Richter, A. and Vascellari, M. and Nikrityuk, P. A. and Hasse, C.
Title: Detailed analysis of reacting particles in an entrained-flow gasifier
Language: English
Abstract:

Abstract For the development of reliable numerical models of entrained flow gasifiers it is crucial to understand and to model correctly the interactions between the hot gas-flow and the coal particles undergoing pyrolysis and char conversion. In this work a laboratory-scale entrained flow coal gasifier was investigated numerically. Based on the detailed analysis of the particle trajectories, the interaction between the flow field and coal particles of different sizes was carefully discussed and analyzed. For small, medium, and large particles, the primary regions for devolatilization, oxidation, and gasification were detected, and the conversion behavior for these particle fractions was quantified in terms of pyrolysis time, residence time, and overall conversion rate. Additional particle-resolved {CFD} calculations were carried out for representative particles of different sizes in order to study the heat and mass transfer of the isolated particles in detail. Pyrolyzing coal particles and combusting or gasifying char particles were considered at several positions in the reactor, where each location is characterized by different gas compositions and temperatures. For these particles, the flow field, and the species and temperature distributions in the boundary layer are discussed. The particle-resolved calculations demonstrate the impact of the particle Reynolds number and the influence of the mass flow from the particle to the surrounding gas on the overall heat and mass transfer.

Journal or Publication Title: Fuel Processing Technology
Volume: 144
Publisher: Elsevier
Uncontrolled Keywords: Coal gasification
Divisions: 16 Department of Mechanical Engineering > Simulation of reactive Thermo-Fluid Systems (STFS)
16 Department of Mechanical Engineering
Date Deposited: 15 Nov 2017 15:27
DOI: 10.1016/j.fuproc.2015.12.014
Official URL: http://dx.doi.org/10.1016/j.fuproc.2015.12.014
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