Combustion characteristics of low-concentration coal mine gas with metal fiber burners

IF 6.4 2区工程技术 Q1 THERMODYNAMICS Case Studies in Thermal Engineering Pub Date : 2024-10-09 DOI:10.1016/j.csite.2024.105256

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Abstract

Coal mine gas with methane concentration lower than 30 % is regarded as low-concentration gas. Currently, both domestically and internationally, coal mine gas with methane concentration ranging from 10 % to 30 % is mainly used for power generation. However, it is not easy to safely combust and treat coal mine gas with methane concentration below 10 %, which is typically directly emitted into the atmosphere, leading to energy wastage and environmental pollution. Metal fiber burners are a type of porous medium burner, suitable for fully premixed combustion, enabling the safe utilization of low-concentration gas within the explosive range. In this study, a direct combustion experimental system was designed to investigate the combustion characteristics of low-concentration coal mine gas with metal fiber burners. The results show that with an increase in the porosity and thickness of the metal fiber woven fabric, the range of area heat release rate expands, and the load adjustment ratio increases, enlarging the range of stable combustion. Single-layer woven fabric burner ignite more easily, followed by double-layer woven fabric burner, while non-woven fabric burner are the least prone to ignition. The results also indicate that when using metal fiber burners to combust low-concentration gas, the emissions of NO_x and CO in the flue gas remain at lower levels.

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使用金属纤维燃烧器的低浓度煤矿瓦斯燃烧特性

甲烷浓度低于 30% 的煤矿瓦斯被视为低浓度瓦斯。目前，国内外主要将甲烷浓度在 10%-30% 之间的煤矿瓦斯用于发电。然而，甲烷浓度低于 10% 的煤矿瓦斯不易安全燃烧和处理，通常直接排放到大气中，造成能源浪费和环境污染。金属纤维燃烧器是一种多孔介质燃烧器，适合全预混燃烧，可安全利用爆炸范围内的低浓度瓦斯。本研究设计了一个直接燃烧实验系统，以研究金属纤维燃烧器对低浓度煤矿瓦斯的燃烧特性。结果表明，随着金属纤维编织物孔隙率和厚度的增加，面积放热率范围扩大，负荷调节比增大，扩大了稳定燃烧的范围。单层编织物燃烧器更容易着火，其次是双层编织物燃烧器，而无纺布燃烧器最不容易着火。结果还表明，使用金属纤维燃烧器燃烧低浓度气体时，烟气中的氮氧化物和一氧化碳排放量保持在较低水平。

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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.