Open Access

ARTICLE

Numerical Simulation of Co-Combustion of Pulverized Coal and Different Proportions of Refused Derived Fuel in TTF Precalciner

Jiekun Zhu, Hongtao Kao^*

College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 211816, China

* Corresponding Author: Hongtao Kao. Email:

Journal of Renewable Materials 2021, 9(7), 1329-1343. https://doi.org/10.32604/jrm.2021.015079

Received 19 November 2020; Accepted 21 December 2020; Issue published 18 March 2021

Abstract

Based on the theory of computational fluid dynamics (CFD), pulverized coal combustion alone, and the co-combustion of pulverized coal and refuse-derived fuel (RDF) in a Trinal-sprayed calciner (TTF) precalciner were simulated. The results revealed that when coal was used as a single fuel, the velocity field in the precalciner had good symmetry, and formed three spray effects and multiple recirculation zones. The main combustion zone was distributed in the lower tertiary air and pulverized coal area, and the highest temperature reached up to 1,500 K. According to the simulation results, the predicted decomposing rate of raw meal was 90.12%, which is in good agreement with the actual measured result. In addition, with the increase in RDF content, the average temperature of the furnace, the decomposition rate of the raw meal, and the NO_x concentration all exhibited a downward trend. Under the condition of ensuring the normal operation of the precalciner, blending with 20% RDF is the most reasonable strategy, and the NO_x emissions decreased by approximately 16%.

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