THERMAL SCIENCE

International Scientific Journal

Quanliang Li

,

Feng He

,

Junlin Xie

,

Shuxia Mei

,

Chao Zhang

,

Yuhua Deng

NUMERICAL SIMULATION OF ALTERING THE RAW MEAL INLET POSITION IN A NOVEL SWIRL PRECALCINER

ABSTRACT
Conducted a numerical simulation to model a novel swirl precalciner, investigating how altering in the position of the raw meal inlet affects the internal gas-flow, temperature field, and component concentration field within the precalciner. Applied the realizable k-ε two-equation turbulent model to the continuous phase. For the particle phase (pulverized coal), employed the discrete particle model and the discrete random walk model. Simulated the combustion of pulverized coal and the decomposition of calcium carbonate by using the species transport model combined with the finite-rate/eddy-dissipation model. Modeled the generation of NOx using a NOx model. The results show that, in comparison to the condition with four raw meal inlets, the six raw meal inlets condition has a better coupling of pulverized coal combustion and raw meal decomposition. The decomposition rate of raw meal has seen a slight improvement, and there is a significant improvement in the occurrence of localized high temperatures within the precalciner, resulting in a reduction of the outlet NOx concentration from 1251 ppm to 225 ppm.
KEYWORDS
precalciner, raw meal inlet position, pulverized coal combustion, calcium carbonate decomposition, NOx, numerical simulation
PAPER SUBMITTED: 2023-11-09
PAPER REVISED: 2024-03-01
PAPER ACCEPTED: 2024-03-07
PUBLISHED ONLINE: 2024-05-18
DOI REFERENCE: https://doi.org/10.2298/TSCI231109112L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 5, PAGES [4013 - 4026]
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Numerical simulation of altering the raw meal inlet position in a novel swirl precalciner

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence