Industrial-Scale Experimental Study on the Thermal Oxidation of Ventilation Air Methane and the Heat Recovery in a Multibed Thermal Flow-Reversal Reactor

Lan, Bo; Li, You–Rong; Zhao, Xusheng; Kang, Jiandong

doi:10.3390/en11061578

Cited by 16 publications

(15 citation statements)

References 24 publications

(9 reference statements)

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“…Thus, Kang et al 137 developed five-bed TFRR equipment which used five regenerative oxidation beds and introduced the purging process to blow the remaining unconverted methane to the combustion chamber before switching the VAM flow direction. Lan et al 138 further investigated the impacts of VAM flow rate, methane concentration, and cycle time on the performance of the fivebed TFRR through an industrial-scale experiment, showing that the increase of inlet flow rate and CH 4 concentration as well as decreasing cycle time improved the heat recovery of TRFF. The five-bed TFRR achieved a methane conversion ratio larger than 97% and a heat recovery ratio of 76.3%.…”

Section: Application Status Of Tfrrmentioning

confidence: 99%

Overview and Outlook on Utilization Technologies of Low-Concentration Coal Mine Methane

et al. 2021

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Coal mine methane (CMM) with the worldwide reserves of 2.6 × 1014 m3 is one of the important unconventional natural gases. However, most of the low-concentration coal mine methane (LC-CMM, cCH4 < 30 vol %) is not utilized and directly emitted to the atmosphere, producing up to about 28 billion m3 CH4 emissions annually and causing a serious greenhouse effect and energy loss. Evidently, resource utilization of LC-CMM is of vital significance to achieve energy transition and carbon neutrality. Herein, we review the recent advances of LC-CMM utilization technologies in terms of low-concentration drainage gas (1 vol % < cCH4 < 30 vol %) and ventilation air methane (VAM, cCH4 < 0.75 vol %). Especially, the great progresses of LC-CMM utilization in China are extensively introduced. A large amount of the low-concentration drainage gas with cCH4 > 6 vol % has been utilized in China due to the wide application of specially designed internal combustion engines (ICEs) and safe pipeline transport technologies. To avoid the shortages of low efficiency and high pollution of ICEs, solid oxide fuel cells (SOFCs) fueled by LC-CMM were recently proposed and modified for improving safety, efficiency, and stability. Also, methane enrichment such as pressure swing adsorption (PSA) and direct burning are key technologies to improve the utilization ratio of the drainage gas with cCH4 < 6 vol %. The modifications to improve the safety and efficiency of the PSA process and the new metal fiber combustion have been developed and applied in China. Furthermore, the recent advances of VAM utilization technologies are introduced. A thermal flow reverse reactor (TFRR) for VAM utilization has been applied in some coal mines. VAM enrichment and a catalytic flow reverse reactor (CFRR) create opportunities to efficiently use VAM with much lower CH4 concentration. Finally, the technical and economic challenges as well as the coping strategies of LC-CMM utilization are described. It is believed that LC-CMM with all various CH4 concentrations can be effectively and cleanly utilized in the near future, contributing to the new energy structure establishment and environment protection.

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Section: Application Status Of Tfrrmentioning

confidence: 99%

Overview and Outlook on Utilization Technologies of Low-Concentration Coal Mine Methane

et al. 2021

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“…According to the available data, the minimum concentration of methane in VAM for the FRR is determined: 0.19 [51], 0.2% [52,53], 0.22% [54,55], 0.25% [33,56], 0.3% [57,58] in case of TFRR, and 0.1% [59], 0.19% [60], 0.13% [61], for catalytic version of reversal reactor. It should be emphasized that despite many years of work, only TFRR reactors have been implemented on an industrial scale for VAM utilization.…”

Section: Implemented Technologymentioning

confidence: 99%

“…There is a similar situation is another Chinese coal mine, namely the Dafosi Coal Mine, where a higher methane-air mixture is obtained by mixing drained low concentration methane (less than 8%) with VAM [33]. A different approach to thermal combustion of VAM was proposed in [54]. Instead of combining a few units of TFRR, the authors proposed one reactor with five inserts beds.…”

Section: Implemented Technologymentioning

confidence: 99%

Will It Be Possible to Put into Practice the Mitigation of Ventilation Air Methane Emissions? Review on the State-of-the-Art and Emerging Materials and Technologies

Pawlaczyk-Kurek

Suwak

2021

Catalysts

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The work refers to the important problem of methane emissions in relation to the ventilation air methane (VAM) emitted to the atmosphere. VAM is fuel that remains unused in most mines around the world due to the low content of the combustible component in the mixture (0.1–1%). The aim of this article is to present the real problems posed by released VAM in its utilization such as variability of flow, methane concentration, or possible presence of gaseous and non-gaseous pollutants. The paper presents the existing technologies that are ready to be implemented or have a reliable potential to be implemented in the industry and those whose development will have strong influence on the effective reduction in VAM emissions. The methods discussed include enrichment, thermal, and catalytic as well as photocatalytic oxidation. The catalysts dedicated to VAM oxidation were reviewed. The literature studies show that currently developed technologies enable more and more efficient oxidation of VAM. The most technologically advanced implemented solutions are based on the thermal oxidation method in TFRR. Catalytic methods are still at the laboratory research phase, but have been intensively developed and have the potential to be implemented at process scale in the future.

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“…Since conventional combustion cannot deal with lowconcentration gas, it is a promising and effective measure to recycle low-concentration gas by regenerative oxidation equipment [9][10][11][12][13][14][15]. e conversion efficiency of methane by regenerative oxidation equipment is affected by many factors.…”

Section: Introductionmentioning

confidence: 99%

“…e latest research shows that the heat recovery efficiency increased linearly with the increase of intake air flow rate and increased parabolically with the increase of intake methane concentration. However, the conversion rate of methane decreased with the increase of cycle period and inlet velocity [10,12,16]. In addition, the design, size, and materials of the equipment can influence the conversion rate of methane [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Combustion of Low‐Concentration Gas in a Porous Media Burner: Reactor Design and Optimization

Chen

Wen

et al. 2021

Shock and Vibration

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In order to utilize the low-concentration gas directly discharged into the atmosphere from 1.1% to 1.50% in coal mine production, the heat storage and oxidation equipment of gas was improved, and the heat storage and safety of gas under high-temperature environment were tested. The experimental results show that the regenerative oxidation system could provide a high-temperature oxidation environment of 1000°C for gas oxidation after changing the heating mode and enhancing the sealing property. The pressure curves of air and gas in the burner were similar. With the increase of gas concentration, the pressure difference between inlet and outlet tended to increase linearly with a minimum pressure differential of 4 kPa (air) and a maximum pressure differential of 11 kPa (1.50% gas). The internal pressure was relatively stable without an instantaneous pressure surge or explosion. The result of this study provides a reference for further research on the low-concentration gas regeneration oxidation unit at high temperatures.

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Industrial-Scale Experimental Study on the Thermal Oxidation of Ventilation Air Methane and the Heat Recovery in a Multibed Thermal Flow-Reversal Reactor

Cited by 16 publications

References 24 publications

Overview and Outlook on Utilization Technologies of Low-Concentration Coal Mine Methane

Overview and Outlook on Utilization Technologies of Low-Concentration Coal Mine Methane

Will It Be Possible to Put into Practice the Mitigation of Ventilation Air Methane Emissions? Review on the State-of-the-Art and Emerging Materials and Technologies

Combustion of Low‐Concentration Gas in a Porous Media Burner: Reactor Design and Optimization

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