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Energies 2018, 11(5), 1030; https://doi.org/10.3390/en11051030

Vacuum Exhaust Process in Pilot-Scale Vacuum Pressure Swing Adsorption for Coal Mine Ventilation Air Methane Enrichment

1,2
,
1,2,* , 1,2,* , 3
and
1
1
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
2
Beijing Higher Institution Engineering Research Center of Energy Conservation and Environmental Protection, Beijing 100083, China
3
College of Biochemical Engineering, Beijing Union University, Beijing 100023, China
*
Authors to whom correspondence should be addressed.
Received: 1 March 2018 / Revised: 28 March 2018 / Accepted: 23 April 2018 / Published: 24 April 2018
(This article belongs to the Special Issue Unconventional Natural Gas (UNG) Recoveries 2018)
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Abstract

Recovery and treatment of methane from coal mine ventilation air methane (VAM) with cost-effective technologies have been an ongoing challenge due to low methane concentrations. In this study, a type of coconut shell-based active carbon was employed to enrich VAM with a three-bed vacuum pressure swing adsorption unit. A new vacuum exhaust step for the VPSA process was introduced. The results show that the vacuum exhaust step can increase the methane concentration of the product without changing adsorption and desorption pressure. Under laboratory conditions, the concentration of product increased from 0.4% to 0.69% as the vacuum exhaust ratio increased from 0 to 3.1 when the feed gas concentration was 0.2%. A 500 m³/h pilot-scale test system for VAM enrichment was built rendering good correlation with the laboratory results in terms of the vacuum exhaust step. By using a two-stage three-bed separation unit, the VAM was enriched from 0.2% to over 1.2%. View Full-Text
Keywords: vacuum exhaust; vacuum pressure swing adsorption (VPSA); ventilation air methane (VAM); enrichment vacuum exhaust; vacuum pressure swing adsorption (VPSA); ventilation air methane (VAM); enrichment
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Yang, X.; Liu, Y.; Li, Z.; Zhang, C.; Xing, Y. Vacuum Exhaust Process in Pilot-Scale Vacuum Pressure Swing Adsorption for Coal Mine Ventilation Air Methane Enrichment. Energies 2018, 11, 1030.

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