Optimization of drying of low-grade coal with high moisture content using a disc dryer

Moon, Seung‐Hyun; Ryu, In‐Soo; Lee, Seung-Jae; Ohm, Tae-In

doi:10.1016/j.fuproc.2014.03.009

Cited by 9 publications

(4 citation statements)

References 13 publications

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“…They found that coal dried quickly, and the moisture content of the product particles was below 2%, and the optimum classification efficiency was 92% by weight at a fluidization velocity of 2.2 m/s. In another study where low-grade coal with high moisture content was dried in a new disc dryer equipped with heating plates and rotary blades, the moisture content of the raw coal dropped from 34% to below 3% within 5 minutes at a heating plate temperature of 150°C [6]. In [7], the drying performance of a solar-biomass hybrid batch type horizontal fluidized bed dryer with a multi-stage heat exchanger and a heat pump for drying rice was investigated, and it was found that the heat recovery drying system provided a thermal energy saving of approximately 46.7% compared to the non-heat recovery drying system.…”

Section: Introductionmentioning

confidence: 99%

Design of a Coal Drying System with Solar-Assisted Heat Pump and Waste Heat Utilisation

ÖKTEN

2023

International Journal of Thermodynamics

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The increase in global energy demand has directed researchers towards making low-quality coals into an environmentally friendly energy source by reducing their high moisture content. Drying coal is a high-energy and time-consuming process, so reducing the required energy and drying time is crucial for drying technology. Coal drying increases the thermal value of coal and makes it easier to transport. In this study, a coal drying system was designed using waste heat recovery systems, R-134a refrigerant as working fluid, air source heat pumps, and vacuum tube solar collectors to provide hot air. Firstly, the moisture content of the coal and the desired moisture content after drying were determined, and then the heat required to dry the coal was calculated. Next, the capacity of the solar collector required to provide the necessary heat to the heat pump was determined, and the type and capacity of the heat pump that could produce the required heat were selected. Finally, the coal dryer was designed based on the specific requirements of the power plant and the type of coal used. As a result, the coal drying system designed with solar-assisted heat pumps and waste heat utilization can increase the efficiency of coal-fired power plants by reducing the moisture content of coal before combustion.

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Section: Introductionmentioning

confidence: 99%

Design of a Coal Drying System with Solar-Assisted Heat Pump and Waste Heat Utilisation

ÖKTEN

2023

International Journal of Thermodynamics

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“…In this study, the influence of three parameters, including sludge feeding rate, heat source temperature, and rotating speed of the shaft, on the drying process of the uniaxial vacuum disc dryer is studied. [ 27 ] For different stages of sludge in the drying process, this study proposes a differential push‐flow structure, which provides different propulsion effects for the sludge in different drying stages.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis and differential push‐flow structure optimization of vacuum disc drying process

Liu

et al. 2023

Can J Chem Eng

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The drying characteristics of sludge in a uniaxial vacuum disc dryer are numerically studied in the present study, and the results showed that the drying process of sludge includes three stages: the viscous stage, the sticky stage, and the granular stage. The influence of main parameters such as sludge feeding rate, heat source temperature, and rotating speed of the shaft on the drying process of sludge in the uniaxial vacuum disc dryer is analyzed. In order to optimize the drying efficiency of the dryer, a differential push‐flow structure is proposed in this study, which provides different propulsion effects for the sludge in different drying stages. The differential push‐flow is achieved by changing the number and angle of the push‐flow blades on the discs. Compared with the dryer before optimization, the dryer with optimized differential push‐flow structure has better performance.

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“…The problem is that this unit operation is affected by multiple factors like the thermal conductivity of solid and liquid, the latent heat of vaporization, the effect of solutes in the liquid, the pressure and temperature of the drying atmosphere, the speed and relative humidity of the air, the vapor pressure of the liquid, the solidliquid surface tension, the size of the particles and their internal porosity, and the vapor diffusion coefficient in the pores, which make tedious the understanding of drying phenomena.To solve this problem, equipment are designed,andexperimentsare rununtil optimal operating conditions are obtained [8]. However, the problems in the output product continue due to the many variables affecting the drying directly and indirectly.…”

Section: Introductionmentioning

confidence: 99%

CFD analysis of a continuous powder dryer with inclined metal sheets

Quiones¹,

Prez²,

Salgado³

2018

IJCTR

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A continuous powder dryer of inclined metal sheets was designed and simulated using computational fluid dynamics. This dryer suggests an alternative for the drying of lactose in the pharmaceutical and food industry where there are high control requirements for moisture content. The dryer was designed to process the granular material over a wide range of particle sizes. The dryer dimensions are calculated by the particle entrainment theory to obtain the terminal particle velocity. CFD simulations were performed by feeding the air in the front and the back of the metal sheets with inclination angles of 40°, 50°, and 60° angles.The results of these simulations indicate that the velocity profiles with the best contact air-solid were obtained using the configuration of 60° inclination angle.

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Optimization of drying of low-grade coal with high moisture content using a disc dryer

Cited by 9 publications

References 13 publications

Design of a Coal Drying System with Solar-Assisted Heat Pump and Waste Heat Utilisation

Design of a Coal Drying System with Solar-Assisted Heat Pump and Waste Heat Utilisation

Numerical analysis and differential push‐flow structure optimization of vacuum disc drying process

CFD analysis of a continuous powder dryer with inclined metal sheets

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