An Experimental Study of the Thermal Performance of a Screw Conveyor Dryer

Waje, S. S.; Thorat, Bhaskar N.; Mujumdar, Arun S.

doi:10.1080/07373930600564506

Cited by 46 publications

(27 citation statements)

References 6 publications

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“…To analyze the thermal behavior of the material inside drier a series of simulations were carried out using CFD software, in order to highlight the heating of the same in function: of the temperature of the water passing through the jacket and the shaft of the auger, of the characteristics of the material in terms of chemical characterization, moisture, thermal capacity and thermal conductivity, of the rotation of the auger and therefore the residence time of the sand inside the dryer [7], [8] and [9].…”

Section: Analysis and Discussionmentioning

confidence: 99%

Thermodynamic analysis of a prototype indirect screw drier for aggregates and recycled mineral aggregates

Cucumo¹,

Ferraro²,

Kaliakatsos³

et al. 2017

IJHT

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In this paper is presented an industrial drier developed, prototyped, tested and analyzed to produce selected aggregates for the construction industry, for a localized and specific production line for the treatment of natural or recycled aggregates. The short production of premixed powder, through the exploitation of local and recycled aggregates, has highlighted the need to design an efficient drying system. The prototype developed as a drier (Screw Conveyor Drier-SCD) with screw at an angle of 20°, 2000 x 3685 mm 7070 x size, isolated outside of indirect heat exchange. The fluid exchanges heat in the circuitry that runs through the inside of the shaft and the outer sleeve of the auger. The type of heat source is not binding; therefore, sources of renewable energy or waste heat can be used, even at low specific enthalpy. During experimental analysis, hot water was used at a maximum temperature of 80 °C and sand with 5-6% moisture input was processed for a flow rate of 2 tons/h. Experimental results have shown, in a two-stage step, a reduction in the humidity up to 30% compared to the initial value and a maximum temperature of 31 °C in solid output. The analysis of experimental results and the data obtained from thermodynamic simulations have shown that the system performance can be optimized through specific improvements of the mechanical parts.

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Section: Analysis and Discussionmentioning

confidence: 99%

Thermodynamic analysis of a prototype indirect screw drier for aggregates and recycled mineral aggregates

Cucumo¹,

Ferraro²,

Kaliakatsos³

et al. 2017

IJHT

View full text Add to dashboard Cite

show abstract

“…9 Waje et al conducted a series of experiments and published several papers about screw conveyor dryer. [10][11][12][13] They investigated residence time distribution (RTD) and mean residence time (MRT) in screw dryer conveyor and found out that with the increasing screw speed, degree of mixing is increased but MRT is decreased. The flow in a screw conveyor dryer approaches plug flow as the feed rate is increased, whereas an increase in the screw speed results in a mixed flow.…”

Section: Introductionmentioning

confidence: 99%

Woodchip drying in a screw conveyor dryer

Kaplan

Celik

2012

Journal of Renewable and Sustainable Energy

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Moisture content of raw biomass materials is a crucial parameter for system efficiency and the main purpose of the drying process is to reduce moisture content of the wet biomass. In this study, the drying characteristics of woodchip dried in a screw conveyor dryer had investigated experimentally. The experimental results demonstrated that drying rate had increased with the increasing drying air temperature and flow rate; however, the amount of volatile organic matters in the sample has kept constant. Furthermore, the results have showed that the best drying conditions in this study is 30 m 3 /h drying airflow rate, 200 C drying air temperature, and co-current dryer type. With these conditions, moisture content of woodchip decreased from 60% to 27% (wet basis, mass %). V C 2012 American Institute of Physics.

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“…[3] Its full potential is still unearthed due to the lack in understanding of hydrodynamic behavior under usual operating conditions. Waje et al [4] have studied the thermal performance of a jacketed screw conveyor dryer for the drying of a highly oxidative fine crystalline material in inert atmosphere under vacuum and reported the values of overall heat transfer coefficient and thermal efficiency in the range of 46-102 W=m 2 K and 25-62%, respectively. The thermal efficiency can be still increased by maintaining proper operating conditions and understanding the relative contribution of heat transfer by conduction and convective modes.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Characteristics of a Pilot-Scale Screw Conveyor Dryer

2007

Self Cite

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This article presents results of an experimental study on the flow characteristics of a pilot-size screw conveyor dryer (SCD). In particular, the effects of granular solids flow rate (15.2-206 kg/h) and screw speed (10.8-28 rpm) on the residence time distribution (RTD) were studied using sand as the model material. The RTD was measured using a dynamic step change in the solids flow rate. Parameters such as solids holdup, degree of fullness, mean residence time, and uniformity of the discharge flow were studied. The solids holdup and hence the degree of fullness was found to decrease with increase in the screw speed and decrease with the solids flow rate. The mean residence time was found to decrease with an increase in the screw speed, as expected. The screw speed and the solids flow rate strongly affected the discharge uniformity. An optimum value of the degree of fullness was observed with regard to the solids flow rate. Over the operating range examined, the solids flow pattern was close to plug flow, as indicated by high values of N and Pe number.

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An Experimental Study of the Thermal Performance of a Screw Conveyor Dryer

Cited by 46 publications

References 6 publications

Thermodynamic analysis of a prototype indirect screw drier for aggregates and recycled mineral aggregates

Thermodynamic analysis of a prototype indirect screw drier for aggregates and recycled mineral aggregates

Woodchip drying in a screw conveyor dryer

Hydrodynamic Characteristics of a Pilot-Scale Screw Conveyor Dryer

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