Modeling of coal combustion in the CFB by the EDC model with the global reaction mechanism

Abstract

Purpose

This paper aims to shows the ability of the EDC model with a global reaction mechanism to describe reactions in the Eulerian simulation of a circulating fluidized bed (CFB).

Design/methodology/approach

The eddy dissipation concept (EDC) model is embedded in an Eulerian-Eulerian approach to simulate homogeneous reactions.

Findings

EDC_G is better than ED_FR in describing chemical reactions. The reaction of CH₄ with O₂ is faster than that of CO with O₂, and NH₃ is more liable to be converted than HCN. The combustion rate is higher than the Boudouard reaction rate of coal particles.N₂O is mainly reduced by carbon, and NO is mainly converted by carbon into N₂ and CO₂.

Originality/value

The EDC model with a global reaction mechanism is embedded in a multi-fluid Eulerian approach to simulate the homogeneous reactions in the coal combustion in a CFB, including combustion of volatile gases, desulfurizing reactions and NO_x reactions.

Citation

Kang, Z., Ding, S., Shuai, Z.-a. and Sun, B. (2018), "Modeling of coal combustion in the CFB by the EDC model with the global reaction mechanism", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 28 No. 4, pp. 963-981. https://doi.org/10.1108/HFF-11-2016-0467