Dual-Stage Drying Process of Lignite Using Pilot Scale Coal Rotary Dryer

Phiciato, Phiciato; Yaskuri, Dedi

doi:10.1080/19392699.2017.1333499

Cited by 7 publications

(3 citation statements)

References 26 publications

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“…The approach presented offers of enhanced energy efficiency, fuel savings, and the use of lower-grade biomass. Phiciato and Yaskuri (2019) [6] performed a dual-stage drying process due to the energy cost and particle size of lignite. In terms of thermal energy transfer, heat transport within a rotating drum presents the following two zones in the bed: a stagnant zone in the lower region and a mixing zone near the bed surface [7].…”

Section: Introductionmentioning

confidence: 99%

A Study for Estimating the Overall Heat Transfer Coefficient in a Pilot-Scale Indirect Rotary Dryer

Donoso-García,

Henríquez-Vargas,

González

et al. 2024

Processes

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An experimental study and dimensional analysis of the effective heat transfer coefficient in a continuous-indirect rotatube dryer using forest biomass as the granular material isare developed in the present work. The study employed a factorial design 33 to investigate the effects of feed flow frequency (20–35–50 (Hz)), drum rotational velocity (6–8–10 (rpm)), and saturated vapor pressure (4–5–6 (bar)) on the heat transfer coefficient. During steady state conditions, the moisture content profiles and inlet and outlet temperatures were measured within the experimental region, and parameters, such as the effective heat transfer coefficient, solid retention change, and moisture content ratio were studied. The results showed that heat transfer was optimized with high solid feeding rates, low pressure, and low rotation, with solid feeding being the predominant factor. The moisture content profiles revealed a change in the hydrodynamic behavior, with the center point of the experimental region being the least optimal. The dimensional analysis yielded a Nu number as a function of Pe, Fr, and the feeding dimensionless number. A new dimensionless energy efficiency number improved the coefficient correlation from 85.88 (%) to 94.46 (%), indicating the developed model potential to predict dimensionless variables and scale continuous-indirect rotatube dryers.

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Section: Introductionmentioning

confidence: 99%

A Study for Estimating the Overall Heat Transfer Coefficient in a Pilot-Scale Indirect Rotary Dryer

Donoso-García,

Henríquez-Vargas,

González

et al. 2024

Processes

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“…Rotary drying is a relatively established technology applied in a wide area. Both fluidized bed and rotary drying need an energy source, usually from flue gas (Phiciato and Yaskuri 2019) or steam (Li et al 2018) for indirect contact or direct contact drying, respectively. Hot oilimmersed drying uses hot oil to evaporate moisture content (Ohm et al 2012).…”

Section: Introductionmentioning

confidence: 99%

A Pilot Plant Study of Coal Dryer: Simulation and Experiment

Halim

Widyanti

Wahyudi

et al. 2022

ASEAN J. Chem. Eng.

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High moisture content in low-range coal causes low calorific value. To increase the quality, drying by a coal dryer to minimize moisture content is proposed. Here, a case study of a cyclone-like conical tube coal dryer pilot plant was reported. Drying heating uses combustion heat generated from volatile matter combustion. This approach will solve the two problems simultaneously: decreasing moisture content and volatile matter. The computational fluid dynamic (CFD) approach is used to study fluid dynamics inside the coal dryer using ANSYS Fluent 2020R2 software. The CFD simulation results represent the phenomenon of coal drying inside the coal dryer validated by the pilot plant experimental result. The simulation was carried out in steady and unsteady conditions to understand the drying phenomena. The simulation firmly fits the experimental result, especially in an unsteady state system, indicating that the simulation result is promising for further coal dryer design. The optimal condition produces a high moisture content reduction of 86.37%, uniform fluid distribution, and significant volatile matter combustion

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“…The moisture content of low-rank coal is one of the most critical properties in coal-fired power plant operation (Luo, Zhang, and Chen 2017;Phiciato and Yaskuri 2019;Yu et al 2013). A large moisture content can degrade the handling properties of powdered coal in the storage and transport facilities (e.g., hoppers) and also reduce the efficiency of combustion and gasification (Chen, Wu, and Agarwal 2000;Kim et al 2013;Potter and Keogh 1981;Pusat, Akkoyunlu, and Erdem 2018;Rahman et al 2017;Tahmasebi, Zheng, and Yu 2016;Xu et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Nondestructive quantification of moisture in powdered low-rank coal by a unilateral nuclear magnetic resonance scanner

Nakashima

Sawatsubashi

Fujii

2020

International Journal of Coal Preparation and Utilization

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Moisture content in coal powder is a critical index because it controls the difficulty of coal handling and ultimately its combustion efficiency in coalfired power plants. A unilateral proton nuclear magnetic resonance (NMR) scanner was applied in a laboratory to nondestructively quantify moisture content in powdered samples of brown and subbituminous coals. Due to the open geometry of the sensor unit, the scanner allows the nondestructive moisture quantification of a portion several millimeters below the surface of a large sample. Proton transverse relaxation was measured by the unilateral NMR scanner, and obtained moisture content values were compared with those by a conventional bilateral NMR apparatus. The comparison showed reasonable agreement with a root mean square residual of 4.1 wt.%H 2 O for a moisture content range of > 12 wt.% H 2 O (wet basis). This moisture-quantification performance by unilateral NMR is sufficient for the quality control of wet coal having a critical value of approximately 30 wt.%H 2 O in terms of the handling property (flow-ability). Because unilateral NMR requires no specific sample preparation, such as sample insertion into tubes, the system is potentially applicable to insitu nondestructive monitoring of the coal moisture in power plants to contribute to improved efficiency of handling and combustion. ARTICLE HISTORY

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Dual-Stage Drying Process of Lignite Using Pilot Scale Coal Rotary Dryer

Cited by 7 publications

References 26 publications

A Study for Estimating the Overall Heat Transfer Coefficient in a Pilot-Scale Indirect Rotary Dryer

A Study for Estimating the Overall Heat Transfer Coefficient in a Pilot-Scale Indirect Rotary Dryer

A Pilot Plant Study of Coal Dryer: Simulation and Experiment

Nondestructive quantification of moisture in powdered low-rank coal by a unilateral nuclear magnetic resonance scanner

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