Study on the evolutions of temperature and oxygen in the goaf of nearly vertical coal seam after low-temperature nitrogen injection

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-03-11 DOI:10.1016/j.csite.2025.106021

Gang Wang , Shuliang Xie , Enmao Wang , Ruida Hao

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Abstract

The near vertical coal seam adopts a segmented mining method to form a layered composite goaf, and its spontaneous combustion law is more complex. In order to understand the evolution law of temperature and oxygen after injecting low-temperature nitrogen into the goaf, the changes in oxygen and temperature before and after injecting low-temperature nitrogen into the goaf were analyzed through on-site observation and CFD numerical simulation. The results showed that after injecting low-temperature nitrogen into the goaf, the oxidation zone decreased by 10.7 m, and the return air corner temperature of this layer and the upper layer decreased by 16.6 K and 12 K, respectively, CO decreased to 0 mg/L; As the injection time of low-temperature nitrogen gas increases, the influence range of low-temperature nitrogen gas gradually increases, and the temperature and oxygen concentration in the goaf continue to decrease to below 283 K. The highest oxygen concentration in this layer's goaf is about 6 %, while the upper layer's goaf is less affected by low-temperature nitrogen gas than this layer's goaf, and the oxygen concentration decreases to 6.8 %. This study provides theoretical support for the prevention and control of coal spontaneous combustion in goaf areas near vertical coal seams.

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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.