Design and testing of small‐scale unsteady‐state afterburners and reactors

Fissore, Davide; Barresi, Antonello; Baldi, Giancarlo; Hevia, Miguel A.G.; Ordóñez, Salvador; Dı́ez, Fernando V.

doi:10.1002/aic.10430

Cited by 37 publications

(58 citation statements)

References 16 publications

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“…• a heat exchanger (H01), used in the start-up phase and for control purposes (according to the design of Fissore et al [9]); • a set of valves (V01, V02, V03, V04) used to periodically reverse the gas flow direction: when valves V01 and V04 are open, and V02 and V03 are closed, the gas flows from the top to the bottom of the reactor, while the opposite occurs when valves V01 and V04 are closed and V02 and V03 are open. Valve V05 is usually closed, and used only for control purposes.…”

Section: Case Studymentioning

confidence: 99%

Lean VOC-Air Mixtures Catalytic Treatment: Cost-Benefit Analysis of Competing Technologies

2017

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Various processing routes are available for the treatment of lean VOC-air mixtures, and a cost-benefit analysis is the tool we propose to identify the most suitable technology. Two systems have been compared in this paper, namely a "traditional" plant, with a catalytic fixed-bed reactor with a heat exchanger for heat recovery purposes, and a "non-traditional" plant, with a catalytic reverse-flow reactor, where regenerative heat recovery may be achieved thanks to the periodical reversal of the flow direction. To be useful for decisions-making, the cost-benefit analysis must be coupled to the reliability, or availability, analysis of the plant. Integrated Dynamic Decision Analysis is used for this purpose as it allows obtaining the full set of possible sequences of events that could result in plant unavailability, and, for each of them, the probability of occurrence is calculated. Benefits are thus expressed in terms of out-of-services times, that have to be minimized, while the costs are expressed in terms of extra-cost for maintenance activities and recovery actions. These variable costs must be considered together with the capital (fixed) cost required for building the plant. Results evidenced the pros and cons of the two plants. The "traditional" plant ensures a higher continuity of services, but also higher operational costs. The reverse-flow reactor-based plant exhibits lower operational costs, but a higher number of protection levels are needed to obtain a similar level of out-of-service. The quantification of risks and benefits allows the stakeholders to deal with a complete picture of the behavior of the plants, fostering a more effective decision-making process. With reference to the case under study and the relevant operational conditions, the regenerative system was demonstrated to be more suitable to treat lean mixtures: in terms of time losses following potential failures the two technologies are comparable (Fixed bed plant: 0.35 h/year and Reverse flow plant: 0.56 h/year), while in terms of operational costs, despite its higher complexity, the regenerative system shows lower costs (1200 €/year).

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Section: Case Studymentioning

confidence: 99%

Lean VOC-Air Mixtures Catalytic Treatment: Cost-Benefit Analysis of Competing Technologies

2017

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“…The working principle has been explained in more detail and the behavior of this unit demonstrated in previous works [23,30]. The near-adiabatic operation of this unit is very difficult to accomplish for bench-scale and smaller units, with high external surface/volume ratio, and it resembles the behavior of industrial-scale reverse-flow reactors, usually of large diameter and hence with low external surface/volume ratio, which tend to be intrinsically adiabatic.…”

Section: Experimental Devicementioning

confidence: 99%

“…Reverse-flow reactors equipped with random particle beds have been the most studied [1,2,23,24], followed by honeycomb monolith bed [8,25,26], while very little attention has been paid to foam beds. The present work aims to fill this gap, by studying experimentally the performance of foam beds in reverse-flow reactors for the catalytic combustion of very lean methane/air mixtures using a Pd/ -SiC foam catalyst, prepared and tested as methane combustion catalyst in a previous work [27].…”

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

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“…The description of the experimental procedure and validation has been published in previous works; different types of solid bed materials have been tested: random particles [35], honeycomb monoliths [32] and ceramic foams [34].…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The other physical and transport properties appearing in the equations are calculated using correlations from the literature; for further details refer to previous works in this field [32,[34][35].…”

Section: Mathematical Modelmentioning

confidence: 99%

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

2014

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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.

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Design and testing of small‐scale unsteady‐state afterburners and reactors

Cited by 37 publications

References 16 publications

Lean VOC-Air Mixtures Catalytic Treatment: Cost-Benefit Analysis of Competing Technologies

Lean VOC-Air Mixtures Catalytic Treatment: Cost-Benefit Analysis of Competing Technologies

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

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

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