Combustion of methane lean mixtures in reverse flow reactors: Comparison between packed and structured catalyst beds

Marín, Pablo; Hevia, Miguel A.G.; Ordóñez, Salvador; Dı́ez, Fernando V.

doi:10.1016/j.cattod.2005.06.003

Cited by 63 publications

(38 citation statements)

References 8 publications

(7 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Good regenerative beds have high heat capacity and surface area per unit of volume, while pressure drop is to be maintained as low as possible. In this context, monolithic structured beds offer the best balance between these properties, and for this reason they are selected in the present work [13,36]. The physical and geometrical properties of the selected bed are summarized in Table 2.…”

Section: Design and Simulation Of A Regenerative Thermal Oxidizermentioning

confidence: 99%

See 1 more Smart Citation

A new method for controlling the ignition state of a regenerative combustor using a heat storage device

2014

Self Cite

View full text Add to dashboard Cite

Regenerative oxidizers are very useful for combustion of methane-air lean mixtures (<1% vol. and as low as 0.15%), as those generated in coal mines (ventilation air methane, VAM). However, the performance of the oxidizer is unstable, leading to overheating or extinction, when methane concentration varies. We propose a new procedure for overcoming this problem, using the heat storage concept. Thus, this issue is addressed by proposing the use of an external sensible heat storage system, added to the regenerative oxidizer, capable of storing the excess of heat released in the oxidizer during rich concentration periods, and using it to heat the feed as needed during lean concentration periods. The performance of the heat storage system has been studied by simulating the behavior of a regenerative thermal oxidizer designed to operate at 0.25% vol. nominal feed methane concentration. It was found that the regenerative oxidizer, provided with the heat storage system together with a feedback controller that regulates the heat extracted/introduced in the oxidizers can operate satisfactory, dealing with the variations in methane concentration found in ventilations of coal mines.

show abstract

Section: Design and Simulation Of A Regenerative Thermal Oxidizermentioning

confidence: 99%

“…Another important advantage of RCO is the lower temperature dependence of the combustion reaction, which results in a better reactor operation, e.g. the reactor extinction and overheating are easier to control [12][13][14]. RCO has also disadvantages, the most important ones being the high cost and deactivation of the catalyst [15].…”

Section: Introductionmentioning

confidence: 99%

A new method for controlling the ignition state of a regenerative combustor using a heat storage device

2014

Self Cite

View full text Add to dashboard Cite

show abstract

“…Methane vented from coal mine exhaust shafts constitutes both an unused source of energy and an atmospheric greenhouse gas (GHG), which is 21 times more potent than Carbon Dioxide over a 100-year timeframe in trapping heat in the atmosphere [1][2][3]. Ventilation air exhaust streams from gassy coal mines are characterized by very large airflows, typically ranging from 47 to 470 cubic meters per second (100,000 to 1,000,000 cubic feet per minute), and containing very low concentrations of methane (ranging from 0.1 to over 1.0 percent) [4].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Heat Distribution and Transfer Characteristics of a Manifold in a Coal Mine VAM TFRR Oxidation Bed

Li¹,

Liu²,

Han³

et al. 2015

TOMEJ

View full text Add to dashboard Cite

A thermal flow-reversal reactor is candidate for utilizing low concentration ventilation air methane. In this paper, a numerical study is performed by using the FLUENT software to explore the details of the transient preheating and starting process of the thermal flow-reversal reactor oxidation bed. The bed was heated by hot gas, which was transported and distributed through the holes of manifolds to the middle of the bed. The homogeneous porous media and coupled heat transfer models were chosen; and the mass and heat flow distributions passing through the holes, the heat transfer on the outer surface of the manifold and the temperature distribution of the bed were calculated. The results indicate that the heat of the hot gas passing through the holes decreases gradually along the direction of the hot gas flowing in the manifold, causing the temperature of the bed decrease accordingly. The calculated temperatures of the oxidation bed are compared with the tested results. The maximum error between the calculation and the test was 8.9%.

show abstract

“…In addition, methane emissions, mainly originated in landfills, coal mining, and natural gas extraction and distribution, constitute an important environmental problem. Methane is a greenhouse gas more than twenty times more powerful than carbon dioxide, so its oxidation to carbon dioxide reduces greatly the net greenhouse gas emissions and contributes to mitigate the global warming [4,5].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the use of ceramic foams as catalyst supports for reverse-flow combustors

Thompson

Marín

Dı́ez

et al. 2013

Chemical Engineering Journal

Self Cite

View full text Add to dashboard Cite

Combustion of methane lean mixtures in reverse flow reactors: Comparison between packed and structured catalyst beds

Cited by 63 publications

References 8 publications

A new method for controlling the ignition state of a regenerative combustor using a heat storage device

A new method for controlling the ignition state of a regenerative combustor using a heat storage device

Numerical Study on Heat Distribution and Transfer Characteristics of a Manifold in a Coal Mine VAM TFRR Oxidation Bed

Evaluation of the use of ceramic foams as catalyst supports for reverse-flow combustors

Contact Info

Product

Resources

About