Screw Conveyor Dryer: Process and Equipment Design

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

doi:10.1080/07373930601161112

Cited by 35 publications

(23 citation statements)

References 10 publications

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“…The schematic of the experimental setup and the details of the dryer geometry have been reported in our earlier work. [4,5] The effective length of the screw for drying purpose was 2.34 m. The screw speed can be varied between 10.8 and 28 rpm. The required flow rate of solids can be set by adjusting the opening of a feed inlet.…”

Section: Screw Conveyor Dryermentioning

confidence: 99%

“…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. Waje et al [4,5] have provided a logical stepwise procedure for screw conveyor dryer design based on the heat and mass transfer calculations. Recently, Waje et al [6] have studied the residence time distribution and the flow patterns in SCD using a pulse tracer technique and found that the flow predominantly lies between the ideal plug flow and the mixed flow regime.…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamic Characteristics of a Pilot-Scale Screw Conveyor Dryer

2007

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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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Section: Screw Conveyor Dryermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Characteristics of a Pilot-Scale Screw Conveyor Dryer

2007

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“…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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“…By virtue of the needs of the project and required characteristics, it was decided to design, prototype, and test a drier auger, denominated in the literature SCD (Screw Conveyor Drier), where the heat transfer fluid exchanges heat indirectly with the material to be dried [3], [4]. Figure 2 shows a diagram of a drier auger where heat exchange is direct or indirect.…”

Section: Figure 1 Diagram Of a Cocurrent Rotary Drum Driermentioning

confidence: 99%

“…A flow of gas inside the drier, with the sole purpose of transporting the evaporated moisture away from the material, is an important factor. The flow of gas can enter and exit from the drier extremes and be cocurrent or countercurrent with the motion of the material to be dried [5], [6].…”

Section: S429mentioning

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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Screw Conveyor Dryer: Process and Equipment Design

Cited by 35 publications

References 10 publications

Hydrodynamic Characteristics of a Pilot-Scale Screw Conveyor Dryer

Hydrodynamic Characteristics of a Pilot-Scale Screw Conveyor Dryer

Woodchip drying in a screw conveyor dryer

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

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