A control strategy of flow reversal with hot gas withdrawal for heat recovery and its application in mitigation and utilization of ventilation air methane in a reverse flow reactor

Li, Zhikai; Qin, Zhangfeng; Zhang, Yagang; Wu, Zhiwei; Wang, Hui; Li, Shuna; Shi, Ruiping; Dong, Mei; Fan, Wei; Wang, Jianguo

doi:10.1016/j.cej.2013.04.105

Cited by 24 publications

(11 citation statements)

References 40 publications

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“…This mode of heat extraction was recently studied from an experimental point of view by Gosiewski et al [142], Kushwaha et al [56] and Li et al [55,147]. Kushwaha et al [56] found that the use of an internal heat exchanger more significantly decreased the temperature in the centre of the reactor than hot air withdrawal (Fig.…”

Section: Heat Extractionmentioning

confidence: 95%

Reverse flow reactors as sustainable devices for performing exothermic reactions: Applications and engineering aspects

Marín

Dı́ez

Ordóñez

2019

Chemical Engineering and Processing - Process Intensification

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Reverse flow reactors are fixed-bed reactors combining in a single intensified device chemical reaction and regenerative heat transfer (energy is stored in a bed as sensible heat). To accomplish this goal, reverse flow reactors are operated in a forced unsteady state created by periodically changing the flow direction. The most important applications of reverse flow reactor are reviewed: oxidation of hydrocarbons and sulphur dioxide, and selective catalytic reduction of nitrogen oxides. These applications involve exothermic reactions. However, recent developments have also made possible it possible the use of reverse flow reactors with endothermic reactions, such methane steam reforming.The modelling of reverse flow reactors is addressed based on the models available for fixed-bed reactors. Practical considerations regarding reverse flow reactors are considered: the selection of the type of bed, the issues of the use of lab-scale devices at dynamic conditions, the assessment of autothermal operation and heat extraction and the integrated adsorption concept. The latter is an innovative concept based on the periodical adsorption in the bed of some of the reactants, products or other feed compounds. This mass regeneration can be combined with the heat regeneration capabilities of reverse flow reactors to increase the degree of process intensification.

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Section: Heat Extractionmentioning

confidence: 95%

Reverse flow reactors as sustainable devices for performing exothermic reactions: Applications and engineering aspects

Marín

Dı́ez

Ordóñez

2019

Chemical Engineering and Processing - Process Intensification

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“…Under rich feed conditions, the heat released and accumulated in the reactor can overheat the catalyst bed, leading to catalyst thermal deactivation. Such issues have limited the industrial use of this type of reactors, and encouraged research in the development of suitable control systems [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have been centred in the influence of operating conditions [19,20], optimization [21], model validation [20,22], control of ignition state [13,23], or heat recovery [14,24]. Although water is present in high concentration in coal mine ventilation air (20,000-50,000 ppm) and the performance and stability of reverse flow reactors can be highly affected by the decrease of the catalyst activity caused by water, to the best of our knowledge, this aspect has not been studied.…”

Section: Introductionmentioning

confidence: 99%

Coal mine ventilation air methane combustion in a catalytic reverse flow reactor: Influence of emission humidity

Fernández

Marín

Dı́ez

et al. 2015

Fuel Processing Technology

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Keywords: Precious metal catalyst Methane deep oxidation Monolithic catalyst Water inhibition Unsteady state reactors Model-based designThe role of the humidity content on the performance of catalytic reverse flow reactors (RFRs) for the abatement of methane emissions from coal mines is studied in this manuscript. It has been demonstrated that this technique is very useful for the abatement, and even upgrading, of these emissions. However, the effect of humidity on the reactor performance has not been addressed yet, in spite of being well known that water is an inhibitor in catalytic combustion. Experimental studies in a lab-scale isothermal fixed bed reactor demonstrated that water decreases the activity of a palladium on alumina catalyst for the combustion of methane, but this inhibition is entirely reversible, results fitting well to a Langmuir-Hinshelwood kinetic model. Then, the influence of water was studied in a bench-scale RFR operating at near adiabatic conditions at different switching times (100-600 s) and methane feed concentrations (2700-7200 ppm). Finally, a mathematical model for the reverse flow reactor, including the kinetic model with water inhibition, has been validated using the experimental results. This model is of key importance for designing this type of reactors for the treatment of mine ventilation emissions.

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“…It has been shown that both solutions have advantages and drawbacks. Li et al [11,12] built a flow-reversal strategy of CFRR based on the thermal front propagation velocity and a logic-based controller. Gosiewski et al [13], Qi et al [14], Gao et al [15], and Zheng et al [16] considered that TFRRs are regarded as an attractive alternative.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Flow Resistance in a Coal Mine Ventilation Air Methane Preheated Catalytic Oxidation Reactor

Zheng

Liu

et al. 2015

Journal of Chemistry

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This paper reports the results of experimental investigation of flow resistance in a coal mine ventilation air methane preheated catalytic oxidation reactor. The experimental system was installed at the Energy Research Institute of Shandong University of Technology. The system has been used to investigate the effects of flow rate (200 Nm3/h to 1000 Nm3/h) and catalytic oxidation bed average temperature (20°C to 560°C) within the preheated catalytic oxidation reactor. The pressure drop and resistance proportion of catalytic oxidation bed, the heat exchanger preheating section, and the heat exchanger flue gas section were measured. In addition, based on a large number of experimental data, the empirical equations of flow resistance are obtained by the least square method. It can also be used in deriving much needed data for preheated catalytic oxidation designs when employed in industry.

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A control strategy of flow reversal with hot gas withdrawal for heat recovery and its application in mitigation and utilization of ventilation air methane in a reverse flow reactor

Cited by 24 publications

References 40 publications

Reverse flow reactors as sustainable devices for performing exothermic reactions: Applications and engineering aspects

Reverse flow reactors as sustainable devices for performing exothermic reactions: Applications and engineering aspects

Coal mine ventilation air methane combustion in a catalytic reverse flow reactor: Influence of emission humidity

Experimental Investigation of Flow Resistance in a Coal Mine Ventilation Air Methane Preheated Catalytic Oxidation Reactor

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