Experimental study on the space time of flexible filamentous particles in a rotary dryer

Geng, Fan; Li, Yimin; Yuan, Lang; Liu, Min; Wang, Xinyong; Yuan, Zhulin; Yan, Yaming; Luo, Dongmei

doi:10.1016/j.expthermflusci.2012.09.011

Cited by 25 publications

(13 citation statements)

References 20 publications

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“…They are extensively employed to handle a wide range of solids and used across a wide range of industries, such as chemical, metallurgy, mineral industry, food and tobacco industries [4]. During the processes, rotary dryers are used successfully to perform drying, mixing, cooling, heating, clinkering, calcining and chemical reactions [5,6].…”

Section: Introductionmentioning

confidence: 99%

Modeling the Total Residence Time in a Rotary Dryer

Huang

Weng

et al. 2015

International Journal of Food Engineering

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A mathematical model for the rotary dryer that determines the total residence time is developed. Experiments were performed in a laboratory-scale direct contact rotary dryer with the gas flowing concurrently with the solids. The model predictions depicted that the total residence time decreases with increasing the inclination of the rotary drum, the speed of rotation and the radius of rotary drum. The validation of the model was carried out experimentally for maize while varying the inclination of the rotary drum and the speed of rotation. The experimental results were observed to be in good agreement with the model predictions.

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Section: Introductionmentioning

confidence: 99%

Modeling the Total Residence Time in a Rotary Dryer

Huang

Weng

et al. 2015

International Journal of Food Engineering

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“…Traditional dryers, including direct and indirect dryers, all can be used for lignite pre-drying [5] . These dryers, including rotary dryer [6] , rotary-tube dryer [7] , fluidized-bed dryer [8] , etc., are evaporative dryers in which moisture in lignite is evaporated and then removed. In recent several years, some innovative dryers were proposed and investigated, including WTA (Wirbelchicht-Trocknung mit integrierter Abwärmenutzung) [9,10] , HTD (Hydrothermal Dewatering) [11][12][13] , MTE (Mechanical Thermal Expression) [14] , etc.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis on a Lignite-Fired Power System Integrated with a Steam Dryer: Investigation on Energy Supply System of the Dryer

et al. 2015

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Lignite is becoming a competitive fuel for power generation with high security of supply and a low price. But a power plant firing lignite directly always has some weaknesses, including low thermal efficiency and high construction investment. That pre-drying lignite before feeding it to the boiler is a potential method to tackle these weaknesses, and low pressure steam extracted from steam turbines is considered as a competitive heat source for the drying process. In a lignite-fired power system integrated with steam dryer, the steam extraction is led to the dryer via connection pipe and depressurization valve directly. To obtain a stable drying temperature in a variable load of power plant, the steam extraction is often used by the dryer after depressurization, which indeed causes exergy loss. To reduce the exergy loss, the steam extraction was proposed to be supplied to the dryer via compressor or ejector. The thermodynamic models were developed to calculate the net efficiency of power system with different energy supply system of the dryer. The energy saving boundary, that the net efficiency of power system could be increased in some ranges of drying temperature by some energy supply system of dryer, Downloaded by [New York University] at 05:02 08 June 2015 2 was gained. Furthermore, the exergy efficiencies were calculated to get the essential of the results obtained. NOMENCLATURE Abbreviation CLPS Conventional Lignite-fired Power System PLPS Pre-dried Lignite-fired Power System PLPSC Pre-dried Lignite-fired Power System that steam energy supplied to the dryer via Compressor PLPSD Pre-dried Lignite-fired Power System that steam energy supplied to the dryer Directly PLPSE Pre-dried Lignite-fired Power System that steam energy supplied to the dryer via Ejector THA Turbine Heat Acceptance condition NHV Net Heating Value Symbols h enthalpy, kJ/kg p pressure, MPa t d the drying temperature, defined as the heat source temperature (saturated temperature of low pressure steam) of the dryer, °C Downloaded by [New York University] at 05:02 08 June 2015 3 E exergy, kJ/kg P electrical power, kW W mechanical power, kW δ relative variation ζ ap station service power consumption rate, %.η cs isentropic efficiency of compressor, % η ex exergy efficiency, % η sg gross efficiency of power system, % η sn net efficiency of power system, % λ pre-drying degree, i.e., the moisture mass pre-dried out of 1 kg raw lignite, kg/kg ω entrainment ratio of the ejector, °C

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“…The Lagrangian approach is based on the particle-particle interaction forces, while the Euler-Euler approach treats the phases mathematically as continuous and interpenetrating. The Lagrangian approach, which is used in the Discrete Element Method (DEM), has already been employed in several simulation studies of flighted rotating drums [5,[10][11][12]. In this approach, each particle trajectory is calculated considering all the active forces, providing information about particles at the microscopic level and describing the individual trajectory of a particle.…”

Section: Introductionmentioning

confidence: 99%