Drying kinetics of coarse lignite particles in a fixed bed

Pusat, Şaban; Akkoyunlu, Mustafa Tahır; Erdem, Hasan Hüseyin; Dağdaş, Ahmet

doi:10.1016/j.fuproc.2014.10.023

Cited by 64 publications

(18 citation statements)

References 34 publications

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“…Therefore, the elements or components of the material are heated individually and instantaneously . Both heat and mass transfer mechanisms are active during the evaporative drying process .…”

Section: Introductionmentioning

confidence: 99%

Conventional and microwave drying of hydrocarbon cutting sludge

Köse

Çelen

Çelik

2018

Env Prog and Sustain Energy

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The purpose of this article is to investigate the drying kinetics and determine the effectiveness of conventional and microwave drying processes for drying of hydrocarbon cutting sludge which is one of the most important waste occurring from petroleum and natural gas cutting activities. Drying experiments of hydrocarbon cutting sludge were performed at MW power levels of 120, 460, and 600 W using microwave dryer and at drying temperatures of 140°C and 180°C. The sample weights were selected as 50, 100, and 150 g. Energy consumption values were determined, according to the microwave power levels, drying temperature, drying times, moisture ratio, as 0.01–0.11 kW/h for microwave, and as 0.11–0.55 kW/h for conventional drying processes. The results showed that the microwave drying was the more effective drying process in terms of drying times and energy consumption. Furthermore, as a result of the statistical analysis, the most suitable model among five drying models was determined according to the χ2, es, and r criteria. © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13104, 2019

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Section: Introductionmentioning

confidence: 99%

Conventional and microwave drying of hydrocarbon cutting sludge

Köse

Çelen

Çelik

2018

Env Prog and Sustain Energy

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“…Drying air temperatures (T) of 100 and 130 C, air velocities (V) of 0.4 and Table 2. Experimental procedure [32] Step Explanation 1 Turn on the system with no lignite in the bed and allow it to reach steady state at desired experimental conditions. 2…”

Section: Resultsmentioning

confidence: 99%

“…In this study, the same experimental set-up and procedure were utilized that were used by Pusat et al [32]. The airflow rate was adjusted by the fan speed control and Coal Drying, Bed Height, and Particle Size airflow rate was measured by an orifice type flowmeter with an accuracy of 1%.…”

Section: Methodsmentioning

confidence: 99%

Effects of Bed Height and Particle Size on Drying of a Turkish Lignite

Pusat

Akkoyunlu

Erdem

et al. 2015

International Journal of Coal Preparation and Utilization

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Drying of coarse lignite particles, because of high inherent moisture content, is very important for the lignite user. An effective drying process is necessary to utilize coarse lignite particles effectively. Fixed-bed drying experiments were carried out for a Turkish lignite (Konya-Ilgın). Effects of bed height and particle size were investigated. Drying experiments were carried out at 80, 130, and 150 mm bed heights and 20, 35, and 50 mm particle sizes. It was found that increasing the bed height increased the drying time and decreased the drying rate, and particles of larger sizes have lower drying rates and higher drying times. Additionally, it was also found that Konya-Ilgın lignite does not show a constant drying rate and has a long falling drying rate. As a result of this study, drying characteristics of Konya-Ilgın lignite were presented for different drying conditions.

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“…Nine shared empirical models [27,29], Lewis model, Henderson and Pabis model, Page model, modified Page model, logarithmic model, Wang and Singh model, twoterm model, approach of diffusion model and Midilli model, are usually used to describe the relation between moisture ratio and drying time in the sample drying.…”

Section: Drying Modelsmentioning

confidence: 99%

A comparison of isothermal with nonisothermal drying kinetics of municipal sewage sludge

Zhang

Chen

2015

J Therm Anal Calorim

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Thermal drying behavior of the municipal sewage sludge in nitrogen atmosphere was explored using a thermal analysis technique under isothermal and nonisothermal drying conditions. The Midilli model, MR ¼ expðÀkt n Þ þ bt, was the best suitable for predicting both the isothermal and nonisothermal drying behavior of the sewage sludge with the highest R 2 . The isothermal drying apparent activation energies of the first falling rate period and the second falling rate period were 18.03 and 11.87 kJ mol -1 , respectively. The nonisothermal drying apparent activation energies of sewage sludge were from 33.61 to 47.37 kJ mol -1 in the first falling rate period and from 20.47 to 33.43 kJ mol -1 in the second falling rate period, respectively. In two falling rate periods, the dominant mechanism functions for the isothermal drying were identical, À lnð1 À aÞ. The dominant mechanism functions for the first falling rate period and the second falling rate period in the nonisothermal drying were described by ½À lnð1 À aÞ 1=2 and ½À lnð1 À aÞ 1=3 , respectively.

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Drying kinetics of coarse lignite particles in a fixed bed

Cited by 64 publications

References 34 publications

Conventional and microwave drying of hydrocarbon cutting sludge

Conventional and microwave drying of hydrocarbon cutting sludge

Effects of Bed Height and Particle Size on Drying of a Turkish Lignite

A comparison of isothermal with nonisothermal drying kinetics of municipal sewage sludge

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