Performance and efficiency analysis of a new annular cooler for waste heat recovery in sintering process

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-04-21 DOI:10.1016/j.csite.2025.106172

Yan Peng , Yaodong Zhang , Kun Jiao , Jian Cui , Hengjian Jin , Zhen Li , Naitao Guo , Huixia Wang , Xinru Zhang , Lin Lin , Zeyi Jiang , Xinxin Zhang

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引用次数: 0

Abstract

Currently, the waste heat recovery rate in the sintering process is less than 40 %. Developing annular coolers with high efficiency is critical for waste heat recovery in sintering processes. Herein, we studied the performance and efficiency of a new annular cooler system that connects two cooling beds in series, by developing a mathematical model. The influence of four parameters on the performance and exergy efficiency of this new process was further studied, including the temperature of cooling gas (T_{g, in4}), the temperature of sinter entering annular coolers (T_{s, in}), the movement speed of sinter bed (V_{sinter bed}), and the height of sinter bed (H_{sinter bed}). The results indicate that the recovered exergy of the new process (300.72 MJ/t·sinter) significantly increases compared to the conventional process (186.51 MJ/t·sinter), with the exergy efficiency rising to 72.34 %, which is 1.6 times higher than that of the conventional process (44.87 %). The internal exergy loss in the new process is reduced by 4.01 MJ per ton of sinter compared to the conventional process. Moreover, T_{s, in} has a significant effect on the recovered exergy of hot gas, while, H_{sinter bed} notably influences the exergy efficiency of the new process. The study provides important theoretical insights to develop new annular coolers for improving waste heat recovery in the sintering process.

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烧结余热回收新型环形冷却器的性能及效率分析

目前，烧结过程中的余热回收率还不到40%。开发高效的环形冷却器是烧结过程中废热回收的关键。本文通过建立数学模型，研究了串联两个冷却床的新型环形冷却系统的性能和效率。进一步研究了冷却气体温度（Tg, in4）、烧结矿进入环形冷却器温度（Ts, in）、烧结床移动速度（Vsinter床）和烧结床高度（Hsinter床）4个参数对新工艺性能和火用效率的影响。结果表明：新工艺回收的火用能（300.72 MJ/t·烧结矿）较常规工艺（186.51 MJ/t·烧结矿）显著提高，火用效率达到72.34%，是常规工艺（44.87%）的1.6倍。与传统工艺相比，新工艺每吨烧结矿的内部火用损失降低了4.01 MJ。此外，Ts， in对热气体的火用回收率有显著影响，而Hsinter床层对新工艺的火用效率有显著影响。该研究为开发新型环形冷却器提高烧结过程余热回收提供了重要的理论见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.