Numerical evaluation of the energetic performances of structured and random packed beds in regenerative thermal oxidizers

Amelio, Mario; Morrone, Pietropaolo

doi:10.1016/j.applthermaleng.2006.10.016

Cited by 41 publications

(30 citation statements)

References 15 publications

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“…1 is lower than that nearby bed A because the burner located in the combustion chamber is closer to bed A. The air temperature in bed B shown by (6) in Fig. 1 continues to decrease due to heat transfer to the ceramic packings in bed B.…”

Section: Rto Performance Testmentioning

confidence: 75%

“…Tel. : +886 2 2182 2928x6277; fax: +886 2 25861939. oxidizers (RTO) have been widely used for VOC control in industries with heat recovery up to 95% [4][5][6][7][8]. When the VOC concentration fed to RTO is above 3% of its lower explosion limit (LEL), the RTO system can maintain its normal performance and completely combust the VOCs to carbon dioxide and water without supplementary fuel.…”

Section: Introductionmentioning

confidence: 99%

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Stripping of organic compounds from wastewater as an auxiliary fuel of regenerative thermal oxidizer

Chang

Chern

2009

Journal of Hazardous Materials

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Section: Rto Performance Testmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Stripping of organic compounds from wastewater as an auxiliary fuel of regenerative thermal oxidizer

Chang

Chern

2009

Journal of Hazardous Materials

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“…More detail on the model and on the relative validation are reported in the literature [28][29][30]. As far as the heat transfer coefficient is concerned, various correlations are present in the literature.…”

Section: Numerical Modelmentioning

confidence: 99%

A numerical analysis of energetic performances of active and passive aftertreatment systems

Algieri¹,

Amelio²,

Morrone³

2009

Int. J. Energy Res.

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SUMMARYThe present work aims to analyze the thermal and the energetic performances of an aftertreatment system with unidirectional and periodic reversal flow within the device. To this purpose a single-channel one-dimensional model was developed in order to assess the heat exchange between the aftertreatment system and the exhaust gas. Furthermore, the temperature profiles of the gas and solid phase were computed and the calculated temperatures were adopted to characterize the energy effectiveness of the aftertreatment system. The comparison between different control modes showed an increase in the heat retention efficiency of the system with reverse flow at low engine load conditions. Conversely, the system with passive thermal management presented higher temperatures of the monolith during the warm-up operations. Furthermore, the influence of unburned hydrocarbons oxidation on the effectiveness of the aftertreatment system was evaluated and the significant influence of the cycle time and the monolith length on the system performance was shown. Finally, the gas residence time was evaluated for different operating conditions.

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“…Equations were solved with a finite difference scheme [17,18]. Mass flow was presumed to remain constant within each time step, but was varied between consecutive time steps to achieve the needed mass flow profile.…”

Section: Random Packed-bed Regeneratorsmentioning

confidence: 99%

The influence of rotary valve distribution systems on the energetic efficiency of regenerative thermal oxidizers (RTO)

Amelio

Florio

Morrone

et al. 2007

Int. J. Energy Res.

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SUMMARYOn-off valve systems, commonly used in regenerative thermal oxidizer (RTO) plants, generate, during the opening time, a mass flow rate (MFR) which is constant. On the contrary, rotary valve systems, which are increasingly adopted in RTO plants, are characterized by variable MFR profiles.In this work, the energy requirements of two RTO systems, equipped with on-off or rotary valves, were determined using a home-developed numerical code. Energy performances were evaluated by calculating the thermal efficiency and pressure drop within structured or random packed bed RTO systems, at the same mean MFR.The results demonstrated that thermal efficiency was only moderately influenced by the valve system, and is slightly lower for the RTO with on-off valve. On the other hand, the study revealed that energy requirements of all RTO systems were basically unaffected by cycle duration, allowing valve rotational velocity to be freely set to maximize for other technical requirements. On the contrary, pressure drop was greatly influenced by the valve type and increased as variability in MFR function augmented. Moreover, the type of regenerator, structured or random packed bed, affected differently the total energy requirements (basically pumping energy plus auxiliary fuel). Energy requirements of structured and random regenerators were comparable only when volatile organic compounds concentration was lower than typical values encountered in the industrial practise. In other cases, structured regenerators RTO were more competitive. Finally, structured regenerators are usually the best choice when rotating valve distribution systems are adopted.

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Numerical evaluation of the energetic performances of structured and random packed beds in regenerative thermal oxidizers

Cited by 41 publications

References 15 publications

Stripping of organic compounds from wastewater as an auxiliary fuel of regenerative thermal oxidizer

Stripping of organic compounds from wastewater as an auxiliary fuel of regenerative thermal oxidizer

A numerical analysis of energetic performances of active and passive aftertreatment systems

The influence of rotary valve distribution systems on the energetic efficiency of regenerative thermal oxidizers (RTO)

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