Pseudophysical Compartment Modeling of an Industrial Flighted Rotary Dryer with Flighted and Unflighted Sections: Energy

Ajayi, O. O.; Sheehan, Madoc

doi:10.1021/acs.iecr.5b02833

Cited by 5 publications

(7 citation statements)

References 28 publications

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Section: Introductionmentioning

confidence: 99%

“…However, their practical use to simulate industrial facilities is partially limited because they require important computational resources. Therefore, it is still necessary to develop physical models [33,34,35,36] capable to reproduce and predict the heat transfer between a gas and a granular medium. Here, we (i) present a minimal physical model which aims to quantify the heat transfer in the case of wall-bounded gas flow through dilute suspension of heavy grains and (ii) use this model to analyze the thermal efficiency of rotary kilns.…”

Section: Introductionmentioning

confidence: 99%

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Heat convection and radiation in flighted rotary kilns: A minimal model

et al. 2016

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We propose a minimal model aiming to describe heat transfer between particles (i.e. grains) and gases in a model of flighted rotary kilns. It considers a channel in which a convective gas interacts with a granular suspension and a granular bed. Despite its simplicity it captures the main experimental findings in the case of dilute suspension of heavy grains typical of what can be observed in many industrial rotary kilns. Energy balance between each phase takes into account the main heat transfer mechanisms between the transverse granular motion and the convective gas. In the absence of radiation heat transfer, the model predicts exponential variations of the temperatures characterized by a length which depends on the granular and gas heat flow rates as well as on the exchange areas. When radiation is taken into account, the model can be solved numerically. For this case, the temperature variations can be fitted by stretched exponentials whose parameters are found to be independent of the studied phases. Finally, an efficiency criterion is proposed to optimize the length of the system

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heat convection and radiation in flighted rotary kilns: A minimal model

et al. 2016

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“…The numerical simulation of full-scale industrial dryers has also attracted the interest of the scientific community . Mabrouk et al developed a numerical model to predict the air temperature and the moisture content of the material along a tunnel dryer.…”

Section: Introductionmentioning

confidence: 99%

“…The numerical simulation of full-scale industrial dryers has also attracted the interest of the scientific community. 15 Mabrouk et al 16 developed a numerical model to predict the air temperature and the moisture content of the material along a tunnel dryer. Mancuhan 17 employed linear programming to find the optimal values of the hot and outdoor air flowrates and stack temperature so as to avoid the risk of condensation in a tunnel dryer used for brick processing.…”

Section: Introductionmentioning

confidence: 99%

Optimal Tunnel Dryer Operating Strategies for the Production of Ceramic Roof Tiles under Tight Quality Considerations

Arvanitidis

Kostoglou

Georgiadis

2023

Ind. Eng. Chem. Res.

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This work presents a model-based approach to systematically derive optimal operating policies for an existing industrial-scale tunnel dryer. The primary focus of the study is to control the shrinkage stage, during which product fracture risk is highest, with the minimum energy cost possible. First, the steady-state dryer operation is optimized with the attained operating policy resulting in 1.5% fuel economy, while assuring product quality. The dryer operation is then optimized at transient state, investigating two case studies, with the derived optimization results being thoroughly compared with those attained when no control actions are taken. The first case considers a 9.57% increase in dryer productivity. It is demonstrated that the derived operating policy guarantees a well-controlled drying process, with the minimum extra fuel consumption being about 7.7%. The second case study considers the coexistence of two different raw clay-based ceramics in the dryer. Once again, the optimal operating scheme assures the final product quality, but with a minimum thermal energy consumption increase of 3.4%.

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“…Ajayi developed a multiscale dynamic model and investigated the change in solid moisture content in the axial position of a rotary dryer under different operating parameters. According to the simulation results, reducing the hard‐scale accumulation, decreasing the drum rotational speed and increasing the gas inlet temperature are all effective means to reduce the outlet moisture content and these parameters directly affect the drying characteristics of materials (Ajayi & Sheehan, ).…”

Section: Introductionmentioning

confidence: 99%

Experimental study on drying characteristic of corncob in plate rotary heat exchanger

Huang

Ling

et al. 2019

J Food Process Engineering

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Agricultural processing residues, such as corncobs, can be used as good biomass pellet fuels. To thoroughly study the drying characteristics of corncobs in a rotary dryer, a plate rotary heat exchanger (PRHE) was applied to the drying of corncob particles in the present article. The PRHE had an inner diameter of 273 mm and a length of 1,000 mm. Twelve rectangular plates were designed as the heating plate. The influence of several parameters on the corncob drying characteristics was experimentally investigated. The results indicated that the drying rate increased with increasing corncob initial moisture content, increasing dryer heating power, and decreasing corncob particle diameter. Then, based on the experimental results, two exponential correlations were regressed by the least squares method. Both the correlations were valid and the three‐parameter model had a better fitting degree than the two‐parameter model. The trend in the drying rate of corncobs in PRHE clearly included a rising‐rate stage and a falling‐rate stage. The Taguchi approach was employed to study the impact degree of different factors on the maximum drying rate, which showed that initial moisture content had the largest impact degree, followed by heating power; furthermore, the effect of particle diameter was not significant. Practical applications Promoting the use of biomass energy is an effective means to respond to the climate change challenge. As one of the major agricultural processing residues in mainland China, corncob can be processed into biomass pellet fuels with easy storage, high energy density, and low pollutant emissions after crushing, drying and compression molding. For the sake of settling the uncontrollable limitations of traditional open air‐drying method for corncob, author developed a new type of plate rotary heat exchanger (PRHE). By investigating the drying characteristics of corncob in PRHE with various experimental conditions, research findings provide references for the development and large‐scale industrial application of plate rotary drying technology in the drying of agricultural processing residues in the future.

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Pseudophysical Compartment Modeling of an Industrial Flighted Rotary Dryer with Flighted and Unflighted Sections: Energy

Cited by 5 publications

References 28 publications

Heat convection and radiation in flighted rotary kilns: A minimal model

Heat convection and radiation in flighted rotary kilns: A minimal model

Optimal Tunnel Dryer Operating Strategies for the Production of Ceramic Roof Tiles under Tight Quality Considerations

Experimental study on drying characteristic of corncob in plate rotary heat exchanger

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