Experimental Enrichment of Low-Concentration Ventilation Air Methane in Free Diffusion Conditions
The massive emission of low concentrations (≤0.5%) of methane (CH4) from ventilation roadways results in resource waste and environmental pollution. To mitigate these emissions, an enrichment tower for low-concentration methane is designed, and segregation and non-segregation experiments are conduct...
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| Format: | Article |
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MDPI AG
2018-02-01
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| Series: | Energies |
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| Online Access: | http://www.mdpi.com/1996-1073/11/2/428 |
| _version_ | 1811300686192705536 |
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| author | Wen Wang Heng Wang Huamin Li Dongyin Li Huaibin Li Zhenhua Li |
| author_facet | Wen Wang Heng Wang Huamin Li Dongyin Li Huaibin Li Zhenhua Li |
| author_sort | Wen Wang |
| collection | DOAJ |
| description | The massive emission of low concentrations (≤0.5%) of methane (CH4) from ventilation roadways results in resource waste and environmental pollution. To mitigate these emissions, an enrichment tower for low-concentration methane is designed, and segregation and non-segregation experiments are conducted. The results reveal that stable concentrations of methane under segregation and non-segregation states in the enrichment tower gradually increase with height, with a maximum methane concentration of 0.64% and 0.54%, respectively. This shows that the methane enrichment effect in free diffusion conditions is more significant under the segregation state than under the non-segregation state. The stable concentration of methane in the middle and upper sections of the enrichment tower shows an increasing trend. However, the stable concentration of methane in the lower section of the enrichment tower has an increasing trend (less than 0.50%). According to the methane molecule Boltzmann distribution law, methane concentration enrichment decreases with height, and the conversion of the methane from the segregated to non-segregated is irreversible. Consequently, industrial applications of methane enrichment from buoyant forces are not feasible for low concentrations of methane. |
| first_indexed | 2024-04-13T06:54:59Z |
| format | Article |
| id | doaj.art-6fdec7b663294c86ac262522a87e69a6 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-13T06:54:59Z |
| publishDate | 2018-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-6fdec7b663294c86ac262522a87e69a62022-12-22T02:57:16ZengMDPI AGEnergies1996-10732018-02-0111242810.3390/en11020428en11020428Experimental Enrichment of Low-Concentration Ventilation Air Methane in Free Diffusion ConditionsWen Wang0Heng Wang1Huamin Li2Dongyin Li3Huaibin Li4Zhenhua Li5School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, ChinaSchool of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, ChinaSchool of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, ChinaSchool of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, ChinaSchool of Resources and Civil Engineering, Northeastern University, Shenyang 110819, ChinaSchool of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, ChinaThe massive emission of low concentrations (≤0.5%) of methane (CH4) from ventilation roadways results in resource waste and environmental pollution. To mitigate these emissions, an enrichment tower for low-concentration methane is designed, and segregation and non-segregation experiments are conducted. The results reveal that stable concentrations of methane under segregation and non-segregation states in the enrichment tower gradually increase with height, with a maximum methane concentration of 0.64% and 0.54%, respectively. This shows that the methane enrichment effect in free diffusion conditions is more significant under the segregation state than under the non-segregation state. The stable concentration of methane in the middle and upper sections of the enrichment tower shows an increasing trend. However, the stable concentration of methane in the lower section of the enrichment tower has an increasing trend (less than 0.50%). According to the methane molecule Boltzmann distribution law, methane concentration enrichment decreases with height, and the conversion of the methane from the segregated to non-segregated is irreversible. Consequently, industrial applications of methane enrichment from buoyant forces are not feasible for low concentrations of methane.http://www.mdpi.com/1996-1073/11/2/428return air in minelow-concentration methanediffusion enrichmentnon-segregation |
| spellingShingle | Wen Wang Heng Wang Huamin Li Dongyin Li Huaibin Li Zhenhua Li Experimental Enrichment of Low-Concentration Ventilation Air Methane in Free Diffusion Conditions Energies return air in mine low-concentration methane diffusion enrichment non-segregation |
| title | Experimental Enrichment of Low-Concentration Ventilation Air Methane in Free Diffusion Conditions |
| title_full | Experimental Enrichment of Low-Concentration Ventilation Air Methane in Free Diffusion Conditions |
| title_fullStr | Experimental Enrichment of Low-Concentration Ventilation Air Methane in Free Diffusion Conditions |
| title_full_unstemmed | Experimental Enrichment of Low-Concentration Ventilation Air Methane in Free Diffusion Conditions |
| title_short | Experimental Enrichment of Low-Concentration Ventilation Air Methane in Free Diffusion Conditions |
| title_sort | experimental enrichment of low concentration ventilation air methane in free diffusion conditions |
| topic | return air in mine low-concentration methane diffusion enrichment non-segregation |
| url | http://www.mdpi.com/1996-1073/11/2/428 |
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