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首页> 美国政府科技报告 >Development of Optimized Diffuser and Spray Fan Systems for Coal Mine Face Ventilation.
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Development of Optimized Diffuser and Spray Fan Systems for Coal Mine Face Ventilation.

机译：煤矿工作面通风优化扩散器及喷雾扇系统的研制。

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This report describes the results of a 4-year investigation into improved face ventilation systems for underground coal mines. The objective was to experimentally determine configurations for a diffuser fan system and a water spray (spray fan) system that will provide a maximum reduction in face methane concentrations without causing an increase in methane concentrations at the operator's position. The experimental evaluation was performed in full-scale mock-up mine entries,simulating continuous mining operations in both a 6-foot and a 4-foot coal seam complete with normal ventilation,water sprays,and methane emission. A limited study was also performed to assess the effect of scrubber discharge location on methane concentrations in the face area. The results indicate that diffuser fan and spray fan systems that were designed to augment the natural airflow pattern in the entry could provide a factor of 3to 5reduction in average methane concentration at the face,compared with a mining machine with just conventional water sprays. The properly designed diffuser and spray fan systems also significantly reduced the total methane present in the entry. A properly designed dust scrubber discharge can reduce face methane levels by a factor of 2.

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