Abstract
In the present work, an industrial-scale experiment on ventilation air methane (VAM) utilization by a multibed thermal flow-reversal reactor (TFRR) is conducted in China. The influence of the inlet flow rate, feed methane concentration, and cycle time on the temperature distribution of the bed and heat recovery efficiency are investigated. The methane conversion in the studied cases exceeds 97%. The results show that the methane concentration during self-maintained operation of the TFRR without heat recovery should not be less than 0.22 vol % when the inlet flow rate is 103,000 Nm3/h and the cycle time is 300 s. As the inlet flow rate decreases, the lower concentration limit of automatic thermal maintenance increases. The peak temperature of the bed approaches the inlet side as the feed methane concentration increases and the cycle time decreases. The heat recovery efficiency increases linearly with increasing inlet flow rate, rises parabolically with an increasing feed methane concentration, and decreases weakly with increasing cycle time.
Highlights
Methane emissions are the second highest non-water greenhouse gas (GHG) emissions.The methane concentration in the atmosphere has risen by 151% during the last 250 years [1]
When a regenerator bed is transformed from a heat-absorbing state to a heat-releasing state, the outlet valve is switched from open to closed, and the inlet valve is switched from closed to open
The influences of the main operating parameters on the reactor behavior were investigated in this work
Summary
Methane emissions are the second highest non-water greenhouse gas (GHG) emissions. The methane concentration in the atmosphere has risen by 151% during the last 250 years [1]. Coal mine methane (CMM) is a major source of anthropogenic methane emissions. CMM is usually diluted by ventilation to degasify the air in the mine. 64% of CMM emissions come from ventilation air methane (VAM) [2]. The pure methane emissions from VAM during coal mining totaled 16.1 billion cubic meters in 2008 in China [3]. The capture and utilization of VAM represent a great challenge because of the large volume and low methane concentration, typically 0.3 vol % to 0.75 vol %, of VAM
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