Simulation-supported measurements in large circulating fluidized bed combustors--颗粒学报PARTICUOLOGY

Werther, J., Hartge, E.-U., Ratschow, L., & Wischnewski, R. (2009). Simulation-supported measurements in large circulating fluidized bed combustors. Particuology, 7(4), 324–331. https://doi.org/10.1016/j.partic.2009.03.007

Simulation-supported measurements in large circulating fluidized bed combustors

Joachim Werther^*, Ernst-Ulrich Hartge, Lars Ratschow, Reiner Wischnewski

Institute of Solids Process Engineering and Particle Technology, Hamburg University of Technology, D 21071 Hamburg, Germany

10.1016/j.partic.2009.03.007

Volume 7, Issue 4, August 2009, Pages 324-331

Received 19 February 2008, Accepted 16 March 2009, Available online 27 June 2009.

E-mail: werther@tuhh.de

Highlights

Abstract

The concept of simulation-supported measurement is suggested for the elucidation of processes occurring in the combustion chambers of large-scale circulating fluidized bed combustors where the desired information cannot be obtained by direct measurements. The concept is illustrated with the example of secondary air injection where the way the air is released, the penetration depth and the evenness of air distribution over the cross-sectional area of the combustion chamber are of interest. The measured information consists of lateral profiles of oxygen concentrations measured with gas sampling probes at two ports which were located 5 and 9 m, respectively, above the level of secondary air injection. The simulation is carried out on the basis of a 3D semi-empirical fluid-mechanical model of the circulating fluidized bed which is combined with models of gas and solids mixing, fuel distribution, devolatilization and combustion of char and volatiles. The combination of the simulation with the measurements yields a clear picture of the mechanism of secondary air injection, its penetration into the combustion chamber and its effect on the local combustion processes. The results confirm the usefulness of the concept of simulation-supported measurement for this application.

Graphical abstract

Keywords

Fluidized bed; Combustion; Local measurements; 3D modeling

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