Nonlinear improvement of mathematical model of coal oxidation heat release and case study of oxygen concentration effect

IF 6.4 2区工程技术 Q1 THERMODYNAMICS Case Studies in Thermal Engineering Pub Date : 2025-04-02 DOI:10.1016/j.csite.2025.106079

Yin Liu , Shijie Deng , Hu Wen , Shangrong Jiang , Jun Guo , Dailin Li , Changming Chen

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Abstract

It is important to accurately calculate coal spontaneous combustion (CSC) characteristic parameters for preventing and controlling coal fire disasters. Previous studies have shown that the process of CSC has nonlinear variation characteristics with temperature and O₂ concentration. Based on this, non-linear improved model of coal oxidation characteristic parameters is constructed in this study, and compared with the linear model calculation case. The results show a power function non-linear relation of coal oxidation characteristic parameters with O₂ concentration. The improved model can more accurately calculate the O₂ consumption rate (OCR), gas formation rate (GFR) and heat release intensity (HRI) in CSC. In contrast, Linear model can more conveniently and quickly obtain the characteristics of coal oxidation. The transcendental equation dichotomy solution of the reaction order considers the actual attenuation characteristics of O₂ in coal sample at the airflow direction, and the calculation result is more accurate. The average O₂ concentration hypothesis method can be used to calculate the reaction order more quickly, and the results are consistent. With an increase in temperature, the O₂ content sensitivity of the oxidation characteristic parameters first decreases and then increases. These findings have theoretical value for preventing and controlling coal fire disasters.

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煤氧化放热数学模型的非线性改进及氧浓度效应的实例研究

准确计算煤自燃特性参数对防治煤火灾害具有重要意义。已有研究表明，CSC过程具有随温度和O2浓度的非线性变化特征。在此基础上，本文建立了煤氧化特性参数的非线性改进模型，并与线性模型计算实例进行了对比。结果表明，煤的氧化特性参数与O2浓度呈幂函数非线性关系。改进后的模型能更准确地计算出CSC的耗氧速率（OCR）、成气速率（GFR）和放热强度（HRI）。相比之下，线性模型可以更方便、快速地得到煤的氧化特性。反应阶的超越方程二分解考虑了煤样中O2在气流方向上的实际衰减特性，计算结果更加准确。采用平均O2浓度假设法可以较快地计算出反应阶数，结果一致。随着温度的升高，氧化特性参数对O2含量的敏感性先降低后升高。研究结果对防治煤火灾害具有一定的理论价值。

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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.