Numerical investigation and optimisation of heat transfer performance in a vertical sinter cooling packed bed using Tagu
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ORIGINAL PAPER
Numerical investigation and optimisation of heat transfer performance in a vertical sinter cooling packed bed using Taguchi and ANOVA methods Jun-peng Fu1
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Jiu-ju Cai1
Received: 31 May 2019 / Revised: 29 November 2019 / Accepted: 11 December 2019 China Iron and Steel Research Institute Group 2020
Abstract The Taguchi and analysis of variance (ANOVA) methods were applied to investigate the effects of the structural and operational parameters on the heat transfer performance of a vertical sinter cooling packed bed. The analysed parameters were the gas flow rate, the air inlet temperature, the sinter inlet temperature, the cooling bed diameter and the cooling bed height, all of which contain three levels. The purpose was to improve the heat transfer performance of a vertical sinter cooling bed. A numerical analysis model was established to assess the heat transfer performance with respect to the varying parameters and their different levels. This mathematical model was validated by using data from practical industrial processes. The Taguchi method for the L27 (35) orthogonal design experiment was selected to evaluate the impacts of the design parameters on the heat transfer performance and to acquire the optimum combination of parameters. The analysis of variance was applied to assess the impact weights and the order of significance of the design parameters. The results show that the sinter inlet temperature and cooling bed diameter have great influences and impact the exergy of the wasted heat recovery by 61.65% and 23.31%, respectively. However, the gas flow rate and the air inlet temperature have small effects on the response. Furthermore, the air and sinter inlet temperatures have the most significant impacts on the efficiency of heat transfer by 68.83% and 23.31%, respectively. The optimal parameter combination (A1B1C3D3E3) was obtained, and the optimal results were validated by confirmation tests. Keywords Vertical sinter packed bed Wasted heat recovery Taguchi method Analysis of variance (ANOVA) Gas–solid heat transfer
1 Introduction Vertical packed beds are widely used in the petrochemical, chemical, cement and iron and steel industries, such as in heavy oil reactors [1], CO2 thermal desorption beds [2], thermal energy storage beds [3] and sinter cooling beds [4]. The aforementioned industrial processes release great quantities of wasted heat and energy into the atmosphere. In particular, the iron and steel industry is the largest pollutant emitting and energy consuming sector. Hot sinter is produced in the sintering process and encompasses & Jun-peng Fu [email protected] 1
Department of Thermal Engineering, SEP Key Laboratory of Eco-Industry, School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
approximately 10% of the total energy consumption in iron and steel industry [5, 6]. To meet a preset temperature, hot sinter particles should be cooled according to the process requirement. Copious wasted heat is
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