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

Pusat, Şaban; Akkoyunlu, Mustafa Tahır; Erdem, Hasan Hüseyin; Teke, İsmail

doi:10.1080/19392699.2015.1009051

Cited by 29 publications

(9 citation statements)

References 33 publications

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“…Pusat and his co-workers ,, also found the drying time was reduced by increasing the air temperature and velocity, or decreasing of the particle size and bed height. Although they used larger particle size and lower temperature, the drying characteristics had a similar trend.…”

Section: Resultsmentioning

confidence: 89%

Drying Kinetics of Soft and Hard Lignite and the Surface Characteristics of Products

Miao

Tian

et al. 2017

Energy Fuels

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Hard (Shengli, SL) and soft (Zhaotong, ZT) lignite by high temperature drying processes using hot gas were explored in this study. The results showed that the temperature played a significant role in the drying process. For SL-2 mm and ZT-2 mm, the drying rate at 300 °C was 4.4 times and 13.6 times that at 150 °C, respectively, which meant that the influence of temperature was more prominent for ZT and the effects of particle size could be reduced by higher temperature. Fifteen kinds of widely used drying kinetics models were fitted with 125 drying tests at 150–300 °C with different particle sizes of different lignite ranks. The residual moisture content prediction equation was constructed based on the logarithmic model, which was associated with temperature, initial moisture content, and drying time. The volatile matters, oxygen-containing functional groups, and contact angle were analyzed to show the surface characteristics of products. SL had small changes after drying, while the volatile matters of ZT decreased 5% and the carboxyl group was significantly reduced, the contact angle was increased, and close to or even greater than SL.

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Section: Resultsmentioning

confidence: 89%

Drying Kinetics of Soft and Hard Lignite and the Surface Characteristics of Products

Miao

Tian

et al. 2017

Energy Fuels

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“…Fluidized bed [3, 9, 25-27, 30-33, 35, 36, 38-41, 47-49, 53] Microwave [5,24,25,53] Moving bed [43] Flash [7] TGA [34,44,56,57] Oven [4,6,37,[50][51][52] Fixed bed [23,28,29,46] Others [8,44,55] Table 5. Experimental drying methods used in the literature.…”

Section: Drying Methods Referencesmentioning

confidence: 99%

“…The fixed-bed drying technology was used to dry the coarse lignite particles [46]. However, there is not much study on the fixed-bed drying.…”

Section: Drying Methods Referencesmentioning

confidence: 99%

Evaporative Drying of Low-Rank Coal

Pusat¹,

Akkoyunlu²,

Erdem³

2016

Sustainable Drying Technologies

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Low-rank coals including the brown and the subbituminous coals are commonly known to contain high moisture content up to %, wet basis , which limits their utilization around the world in spite of their low cost. Today, the most of the drying technologies are based on the evaporation of the water from the moist product. In this chapter, the most effective parameters on the evaporative coal-drying process are investigated with the data in the recent literature. The effective parameters are evaluated in three categories as follows the parameters about the drying media the type of the media, the temperature, the pressure, the velocity and the relative humidity , the coal parameters the type of the coal and the size and the drying method.

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“…In addition to the size, a linear increase in the average weight of one cone is also observed. A study conducted on drying of coarse lignite particles of varying particle size indicates that larger particle sizes require longer drying times as compare to the small particles [31]. Particles smaller in size have a larger specific surface area which results in faster heating rate and better transfer of heat from the drying medium to the center.…”

Section: Hop Cone Sizementioning

confidence: 99%

Impact of Process Parameters and Bulk Properties on Quality of Dried Hops

et al. 2020

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Hops are critical to the brewing industry. In commercial hop drying, a large bulk of hops is dried in multistage kilns for several hours. This affects the drying behavior and alters the amount and chemical composition of the hop oils. To understand these changes, hops of the var. Hallertauer Tradition were dried in bulks of 15, 25 and 35 kg/m² at 60 °C and 0.35 m/s. Additionally, bulks of 25 kg/m² were also dried at 65 °C and 0.45 m/s to assess the effect of change in temperature and velocity, respectively. The results obtained show that bulk weights significantly influence the drying behavior. Classification based on the cone size reveals 45.4% medium cones, 41.2% small cones and 8.6% large cones. The highest ΔE value of 6.3 and specific energy consumption (113,476 kJ/kgH2O) were observed for the 15 kg/m² bulk. Increasing the temperature from 60 °C to 65 °C increased the oil yield losses by about 7% and myrcene losses by 22%. The results obtained show that it is important to define and consider optimum bulk and process parameters, to optimize the hop drying process to improve the process efficiency as well the product quality.

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

Cited by 29 publications

References 33 publications

Drying Kinetics of Soft and Hard Lignite and the Surface Characteristics of Products

Drying Kinetics of Soft and Hard Lignite and the Surface Characteristics of Products

Evaporative Drying of Low-Rank Coal

Impact of Process Parameters and Bulk Properties on Quality of Dried Hops

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