Modelling steam drying of a single porous ceramic sphere: experiments and simulations

Hager, Jörgen; Hermansson, Magnus; Wimmerstedt, Roland

doi:10.1016/s0009-2509(96)00493-9

Cited by 53 publications

(31 citation statements)

References 8 publications

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“…Increasing operating temperature increased the drying rates and decreased the final moisture content as well Cenkowski et al (1996) 160 Hager et al (1997) 125-175 Shibata et al (1990) 100-135 Taechapairoj et al (2003) 150-170 Taechapairoj et al (2004) 150-170 Tang and Cenkowski (2000) 125-165 as the drying times. Increasing the degree of vacuum had an influence in a lesser extent, however, increased the degree of superheating as a result of a lower saturation temperature.…”

Section: Discussionmentioning

confidence: 83%

Drying of seeds in a superheated steam vacuum fluidized bed

Kozanoglu

Vazquez

Chanes

et al. 2006

Journal of Food Engineering

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Section: Discussionmentioning

confidence: 83%

Drying of seeds in a superheated steam vacuum fluidized bed

Kozanoglu

Vazquez

Chanes

et al. 2006

Journal of Food Engineering

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“…The empirical equation proposed by this study is superior to the other experimental correlation presented in [9, 16,17] in the temperature range above 110˝C and it includes and addresses the phenomenon observed in the case of lignite with high ash contamination. Figure 16c compares additionally the equilibrium moisture content derived by Tang and Cenkowski [27] for various materials on the basis of experimental research on ceramic spheres [28], spent grains [27], wood chips [29], and paper pulp [30]. It is noticeable that the sorption isobars of lignite are higher than for other materials, except the results for the ash-contaminated Turow lignite.…”

Section: Evaluation Of the Residual Moisture Contentmentioning

confidence: 91%

Experimental Attempts to Investigate the Influence of Petrographic Properties on Drying Characteristics of Lignite in Superheated Steam Atmosphere

et al. 2016

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A superheated steam fluidized bed dryer (SSFBD) in a self-heat recuperative configuration has a great potential of improving thermal efficiency of a lignite-fired power plant by recovering both of latent heat of vaporization of water kept in the fuel and part of sensible heat during the fuel processing. However, the optimal design of the dryer requires the fundamental knowledge of drying characteristics in respect to the individual properties of the utilized fuel. Experimental investigation to determine the correlation between a specific coal properties originated from geological background and its drying characteristics is thus the major concern in this paper. The investigated lignite is a representative of Turoszow deposit in Poland. Experimental attempts unveiling drying kinetics were carried out for 5 mm and 10 mm diameter spherical samples in the superheated steam atmosphere in the temperature range of 110˝C-170˝C. Simultaneous and continuous measurements of changes in weight, surface and interior temperatures and appearance on each tested sample were carried out for describing drying behavior. Analytical investigation was applied to explain the drying characteristics, which are strongly affected by the individual properties of coal and the inherent ash composition.

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“…Interface receding theory was used to model the evaporation from the single particle. Hager et al (1997 and developed a model for superheated steam of a single porous spherical ceramic material. In their research, different mechanisms were used to present superheated steam drying.…”

Section: Receding Core Modelmentioning

confidence: 99%

“…Trommelen and Crosby (1969) demonstrated the use of correlations of heat transfer coefficient which is applicable for evaporation of small pure water drops in air is also valid for evaporation in superheated steam. Forced convective heat transfer can be assumed to take place between the bulk superheated steam and the particle surface either covered with water layer or not, proposed by Hager et al (1997), Equation (10) heat capacity of the superheated steam.…”

Section: Initial Condensation Heating Periodmentioning

confidence: 99%

Drying Steps under Superheated Steam: A Review and Modeling

Hamawand¹

2013

EER

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Superheated steam drying has been a subject of research for many decades. Many researchers have claimed that superheated steam drying is saving energy and produces better product quality compared to air drying. Superheated steam can be distinguished from air drying by the diffusion step in the drying process. Steam drying does not include moisture diffusion from the interior of the particle to its surface. However, in air drying, diffusion is the main and the limiting step. This paper is presenting a review to the models have been used to describe drying under superheated steam. Also, modelling was carried out to all the steps that take place in the drying process. These steps are: initial condensation on the surface of the particle, diffusion of the initially condensed vapour to the interior of the particle, evaporation of the initially condensed vapour and finally drying of the whole particle due to receding core model. Understanding these steps is very important for controlling the quality of the dried products and preventing difficulties such as sticking. These steps were modelled using MATLAB software. Numerical solutions with finite difference Euler's method were used to solve the equations describe the drying steps. The theoretical results were then formulated in figures to show the behaviour of the whole drying process. Comparison of the theoretical results from this study with experimental data was left for the upcoming article.

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Modelling steam drying of a single porous ceramic sphere: experiments and simulations

Cited by 53 publications

References 8 publications

Drying of seeds in a superheated steam vacuum fluidized bed

Drying of seeds in a superheated steam vacuum fluidized bed

Experimental Attempts to Investigate the Influence of Petrographic Properties on Drying Characteristics of Lignite in Superheated Steam Atmosphere

Drying Steps under Superheated Steam: A Review and Modeling

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