New exploration on the goaf inerting with hidden fire source under CO2 injection volume of adsorption compensation

IF 6.4 2区工程技术 Q1 THERMODYNAMICS Case Studies in Thermal Engineering Pub Date : 2024-10-01 DOI:10.1016/j.csite.2024.105203

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Abstract

To strengthen the rationality of the design of CO₂ injection volume in goaf, a framework is proposed to study goaf inerting characteristics with hidden fire sources under CO₂ injection volume of adsorption compensation. The zone of hidden fire source is determined by similar simulation experiment of coal spontaneous combustion on a working face of coal mine. The range of injection volume without adsorption is calculated theoretically. A three-dimensional initial flow field model of coal spontaneous combustion is established combined with field measurement. The error of oxidation zone width is 3.64 %, which verifies the reliability of model. The influence of injection volume on the inerting effect in goaf is studied, and optimal injection volume without adsorption is 1000 m³/h. Based on the relationship between adsorption capacity and temperature, a quantization model of injection volume with adsorption compensation is established. The maximum dissipation ratio is then proposed. The optimal injection volume after adsorption compensation is calculated. The results show that intermittent injection of gaseous CO₂ is recommended under simulated conditions. The maximum dissipation ratio is 1/4, and the CO₂ injection volume compensated by adsorption is 1333 m³/h. The research results can provide theoretical guidance for the optimization of CO₂ inerting parameters in goaf.

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吸附补偿二氧化碳喷射量下的隐蔽火源沼气惰化新探索

为加强煤层二氧化碳注入量设计的合理性，提出了吸附补偿二氧化碳注入量下隐蔽火源的煤层惰化特性研究框架。通过类似的煤矿工作面煤炭自燃模拟实验，确定了隐蔽火源区域。从理论上计算了无吸附的喷射量范围。结合现场测量，建立了煤炭自燃的三维初始流场模型。氧化区宽度误差为 3.64%，验证了模型的可靠性。研究了喷射量对煤层气惰化效果的影响，无吸附的最佳喷射量为 1000 m3/h。根据吸附容量与温度的关系，建立了有吸附补偿的喷射量量化模型。然后提出了最大耗散比。计算了吸附补偿后的最佳注入量。结果表明，在模拟条件下，建议间歇注入气态二氧化碳。最大耗散比为 1/4，吸附补偿后的二氧化碳注入量为 1333 m3/h。研究结果可为优化煤层气中的二氧化碳惰化参数提供理论指导。

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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.