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analysis of thermal efficiency of drying drum of asphalt

analysis of thermal efficiency of drying drum of asphalt

(PDF) Simulation of Aggregate Heating in Asphalt Plants

The effects of aggregate particle size, drum speed and flight on the variation aggregate temperature, and the effect of fluid temperature on thermal efficiency were investigated. ...

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A review of thermal processes in the production and their ...

2019-5-10  The derived 1-D thermal-granular model can also be used to analyze the effects of rotational speed, flight design, and drum length on the energy efficiency in the production of asphalt mixtures , . The merit of the 1-D thermal-granular model is that the computational cost is affordable to be applied for an industrial-scale drum dryer.

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Energy and exergy analysis in an asphalt plant’s rotary dryer

2011-5-1  As introduced in Section 2, the elutriation in the rotary dryer is a mechanism of reducing the global efficiency of the asphalt plant and rising the energy needed per unit mass of final product, giving an approximate value of 0.5 kWh when increasing 1% f m. Download : Download full-size image; Fig. 4.

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Parallel-Flow Drum-Mix Plants

2006-10-23  of the drum for parallel- and counter-flow drums are shown in Figures 9-5 and 9-6. The difference between the exhaust gas and mix discharge temperatures repre­ sents the efficiency of the heat transfer process and the amount of heat that is available to dry and heat the ag­ gregate. Perfect heat transfer in a parallel-flow drum

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Analysis of process energy use of asphalt-mixing plants ...

1993-7-1  The consumption for this purpose is estimated from E =M (W/100)(70C +0+M (70C), dry a p I a a (1) where M is the total aggregate weight, W the overall aggregate moisture content in percent, C and C are, respectively, the specific heat capacity and latent heat capacity of water, and C is the heat capacity a Analysis of process energy use of ...

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1 Fundamentals of Energy Analysis of Dryers - Wiley-VCH

2011-11-8  1) Thermal inefficiencies in the dryer: exhaust heat content in convective dryers, sensible heating of solids, heat losses from dryer body. 2) Thermal inefficiencies in the utility (heat supply) system: steam generation efficiency, steam leaks and mains losses. 3) Additional energy demands: power for solids transport, vacuum pumps and air fans.

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Simulation of Aggregate Heating in Asphalt Plants ...

2014-5-22  Lowering production temperature in warm mix asphalt technology may lead to inadequate drying of aggregates, resulting in low-quality asphalt production. Due to difficulty in direct observation of the drying and heating process and measurement of aggregate temperature inside the dryer, numerical analysis offers an alternative way to study heat ...

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Process simulation and analysis of a closed-loop heat

2.2. Fabric drying model. The fabric drying process in a drum , , can be divided into three periods, namely warm-up period, constant rate drying period, and falling rate drying period. During the initial warm-up period, both clothes and the drum are heated. During the constant rate drying period, the drying rate is determined by the heat transfer rate to the surface, and the mass transfer rate ...

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Application of Rotary Drum Dryer at Ombilin Coal Fired ...

2015-4-30  drum dryer in various speed of rotation (14, 15, and 16 rpm). The temperature of flue gas is maintained in range at 300 . 0. C + 30 . 0. C. Coal which tested is came from same mine. The relationship between rotating speed with decreasing moisture, increasing fixed carbon, and HHV of rotary drum dryer is known by this experiment.

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Drying Technology - an overview ScienceDirect Topics

2.6.6.2 Thermal Drying. The moisture content remaining after mechanical dewatering can be removed by thermal means. For a cofiring setup, it may be advantageous to use low grade waste heat to carry out thermal drying of the biomass. There are several types of dryers with varying sizes, configurations, and flows that can be used for this purpose.

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A review of thermal processes in the production and their ...

2019-5-10  The derived 1-D thermal-granular model can also be used to analyze the effects of rotational speed, flight design, and drum length on the energy efficiency in the production of asphalt mixtures , . The merit of the 1-D thermal-granular model is that the computational cost is affordable to be applied for an industrial-scale drum dryer.

get price

Parallel-Flow Drum-Mix Plants

2006-10-23  of the drum for parallel- and counter-flow drums are shown in Figures 9-5 and 9-6. The difference between the exhaust gas and mix discharge temperatures repre­ sents the efficiency of the heat transfer process and the amount of heat that is available to dry and heat the ag­ gregate. Perfect heat transfer in a parallel-flow drum

get price

Simulation of Aggregate Heating in Asphalt Plants ...

2014-5-22  Lowering production temperature in warm mix asphalt technology may lead to inadequate drying of aggregates, resulting in low-quality asphalt production. Due to difficulty in direct observation of the drying and heating process and measurement of aggregate temperature inside the dryer, numerical analysis offers an alternative way to study heat ...

get price

BEST PRACTICE MANUAL - DRYERS - NREDCAP

2012-12-5  Latent heat of evaporation = 2257 kJ kg-1(at 100 °C so heat necessary to supply = 30 x 2257 = 6.8 x l0 4 kJ 2.3 Estimation of drying time The rate of drying is determined for a sample of substance by suspending it in a cabinet or duct, in a stream of air from a balance. The weight of the drying sample can then be measured

get price

Application of Rotary Drum Dryer at Ombilin Coal Fired ...

2015-4-30  drum dryer in various speed of rotation (14, 15, and 16 rpm). The temperature of flue gas is maintained in range at 300 . 0. C + 30 . 0. C. Coal which tested is came from same mine. The relationship between rotating speed with decreasing moisture, increasing fixed carbon, and HHV of rotary drum dryer is known by this experiment.

get price

PROCESS DESIGN OF DRYERS (PROJECT STANDARDS

2016-3-6  In drying of wet solids, the following main factors, which essentially are used in process design calculation of dryers should be defined in accordance with mass and heat transfer principles, process conditions and drying behavior: - Drying characteristics. - Constant-rate period. - Falling-rate period. - Moisture content. - Diffusion concept.

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How to Change Flights on Dryers and Drum Mixers ...

Step 1. Use an arc gouger or torch to cut bolts that hold the existing flights. Step 2. If like and kind flights are to be installed, inspect the existing mounting brackets. Make repairs or replace the brackets before installing new flights in the first quarter-section located

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Section 4 Chapter 1 Fundamentals - Sahand University of ...

2003-9-21  which are used almost exclusively for drying heat-sensitive products because they tend to be significantly more expensive than dryers operate near to atmospheric pressure. Another exception is the emerging technology of superheated steam drying (Mujumdar, 1995). In certain cases, such as the drum drying of pasty foods, some or all of the heat is

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EXPERTS IN ENERGY AND DRYING

2017-5-9  and drying systems as well as burners of all types. The combination of innovation and expertise is the basis of our success. Benefits for our customers: Drying systems for numerous types of bulk solids and fibres Energy systems including thermal oil heaters and steam generators for the utilisation of biomass, dust and primary fuels

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Flash Dryer GEA Solid Feed Drying

The Feed-Type Ring Dryer is used for waste products, sludges, animal feeds, organic fertilizers and chemicals. P-Type Ring Dryer. In addition to improving the thermal efficiency of the system, the use of the P-Type manifold in recycling the solids to a cooler section of the system, also minimizes the risk of thermal degradation.

get price

Simulation of Aggregate Heating in Asphalt Plants ...

2014-5-22  Lowering production temperature in warm mix asphalt technology may lead to inadequate drying of aggregates, resulting in low-quality asphalt production. Due to difficulty in direct observation of the drying and heating process and measurement of aggregate temperature inside the dryer, numerical analysis offers an alternative way to study heat ...

get price

Managing Thermal Energy of Exhaust Gasesin the

drying and heating the mineral mixture in the rotary drum. For the drying of stone material, the use of the exhaust gas heat potential is proposed as an energy source in the drying process, the temperature of which, at the outlet of the chimney of the asphalt plant, is about 80 °C. 2 POSSIBILITIES OF APPLYING EXHAUST GAS HEAT IN

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Application of Rotary Drum Dryer at Ombilin Coal Fired ...

2015-4-30  drum dryer in various speed of rotation (14, 15, and 16 rpm). The temperature of flue gas is maintained in range at 300 . 0. C + 30 . 0. C. Coal which tested is came from same mine. The relationship between rotating speed with decreasing moisture, increasing fixed carbon, and HHV of rotary drum dryer is known by this experiment.

get price

Waste heat recovery exchanger applied to the rotary drum ...

The energy analysis shows that the energy efficiency of the rotary drum without exchanger is 8 4%, in agreement with the data ob tained by some author s [Peinado et a l , 2011] working on ro tary ...

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BEST PRACTICE MANUAL - DRYERS - NREDCAP

2012-12-5  Latent heat of evaporation = 2257 kJ kg-1(at 100 °C so heat necessary to supply = 30 x 2257 = 6.8 x l0 4 kJ 2.3 Estimation of drying time The rate of drying is determined for a sample of substance by suspending it in a cabinet or duct, in a stream of air from a balance. The weight of the drying sample can then be measured

get price

How to Change Flights on Dryers and Drum Mixers ...

Step 1. Use an arc gouger or torch to cut bolts that hold the existing flights. Step 2. If like and kind flights are to be installed, inspect the existing mounting brackets. Make repairs or replace the brackets before installing new flights in the first quarter-section located

get price

Simulation and Experimental Study on Drying Process of

2019-11-27  This paper analyzed the drying process of the household gas clothes dryer (GCD) based on the principle of heat and mass transfer. The drying models in three scenarios were established: natural gas burned in combustion chamber, ambient air

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Ex Series ADM Asphalt Drum Mixers

The EX Series’ unique single-drum counterflow technology system utilizes separate drying and mixing zones to achieve the highest level of heat transfer and fuel efficiency available. EX plants are capable of processing high percentages of recycled asphalt

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Section 4 Chapter 1 Fundamentals - Sahand University of ...

2003-9-21  which are used almost exclusively for drying heat-sensitive products because they tend to be significantly more expensive than dryers operate near to atmospheric pressure. Another exception is the emerging technology of superheated steam drying (Mujumdar, 1995). In certain cases, such as the drum drying of pasty foods, some or all of the heat is

get price

Flash Dryer GEA Solid Feed Drying

The Feed-Type Ring Dryer is used for waste products, sludges, animal feeds, organic fertilizers and chemicals. P-Type Ring Dryer. In addition to improving the thermal efficiency of the system, the use of the P-Type manifold in recycling the solids to a cooler section of the system, also minimizes the risk of thermal degradation.

get price