A CFD Study of the Air Distribution at Non-Conventional Dryers Using Different Configurations of Mini Pipes

2014 ◽  
Vol 802 ◽  
pp. 203-208
Author(s):  
B.C. Silvério ◽  
I.A. Resende ◽  
D.B. Santos ◽  
C.R. Duarte ◽  
M.A.S. Barrozo
Keyword(s):  
Air Distribution ◽  
Drying Process ◽  
Industrial Plants ◽  
Rotary Dryer ◽  
Potential Benefits ◽  
Rotary Drying

Rotary dryers are a significant capital item for many industrial plants. Many potential benefits can be obtained through a greater understanding of the rotary drying process. In order to improve drying efficacy, a novel version of the rotary dryer, known as the rotoaerated dryer, was evaluated in previous studies. This work has studied the effect of the configuration and arrangement of mini-pipes in the rotoaerated dryers by experimental and CFD techniques. The results obtained showed that it was possible to predict the effect of variations in the configuration of the rotoaerated dryer and obtain the more appropriate arrangement of mini-pipes.

scholarly journals Intelligent Control in the Application of a Rotary Dryer for Reduction in the Over-Drying of Cut Tobacco

2021 ◽  
Vol 11 (17) ◽  
pp. 8205
Author(s):  
Shunpeng Pang ◽  
Junhua Jia ◽  
Xiangqian Ding ◽  
Shusong Yu ◽  
Yang Liu
Keyword(s):  
Moisture Content ◽  
Regulatory Control ◽  
Drying Process ◽  
Tobacco Production ◽  
Rotary Dryer ◽  
Moisture Content Level ◽  
Optimal Value ◽  
Cut Tobacco ◽  
Rotary Drying ◽  
Unit Performance

The drying process is fundamental for cut tobacco processing. However, there are some problems related to the drying process such as overheating, or inconsistent control of moisture content. This paper shows how an intelligent controller is designed for an industrial rotary drying system. This controller is applied to a tobacco production unit to reduce overdried cut tobacco and improve the overall unit performance. The proposed control system aims to keep the content of moisture at the dryer outlet as close as possible to the optimal value and improve the homogeneity of the product without any operator intervention. The study shows that, if a reduction of humidity in the cut tobacco drying process is achieved using AI, the quality of the final product improves. In particular, if compared to regulatory control, the proposed method constantly monitors and adjusts the moisture content level in order to reduce the amount of overdried product. The findings of this paper indicate that the suggested process can save at least 222.2 kg of cut tobacco for each batch in the first stage of the drying process.

scholarly journals Wood Chip Drying through the Using of a Mobile Rotary Dryer

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1590 ◽  
Author(s):  
Angelo Del Giudice ◽  
Andrea Acampora ◽  
Enrico Santangelo ◽  
Luigi Pari ◽  
Simone Bergonzoli ◽  
...  
Keyword(s):  
Moisture Content ◽  
Power Plants ◽  
Black Locust ◽  
Thermal Power ◽  
Initial Moisture Content ◽  
Wood Chip ◽  
Wood Chips ◽  
Cocurrent Flow ◽  
Drying Process ◽  
Rotary Dryer

Drying is a critical point for the exploitation of biomass for energy production. High moisture content negatively affects the efficiency of power generation in combustion and gasification systems. Different types of dryers are available however; it is known that rotary dryers have low cost of maintenance and consume 15% and 30% less in terms of specific energy. The study analyzed the drying process of woody residues using a new prototype of mobile rotary dryer cocurrent flow. Woodchip of poplar (Populus spp.), black locust (Robinia pseudoacacia L.), and grapevine (Vitis vinifera L.) pruning were dried in a rotary drier. The drying cycle lasted 8 h for poplar, 6 h for black locust, and 6 h for pruning of grapevine. The initial biomass had a moisture content of around 50% for the poplar and around 30% for grapevine and black locust. The study showed that some characteristics of the biomass (e.g., initial moisture content, particle size distribution, bulk density) influence the technical parameters (i.e., airflow temperature, rate, and speed) of the drying process and, hence, the energy demand. At the end of the drying process, 17% of water was removed for poplar wood chips and 31% for grapevine and black locust wood chips. To achieve this, result the three-biomass required 1.61 (poplar), 0.86 (grapevine), and 1.12 MJ kgdry solids−1 (black locust), with an efficiency of thermal drying (η) respectively of 37%, 12%, and 27%. In the future, the results obtained suggest an increase in the efficiency of the thermal insulation of the mobile dryer, and the application of the mobile dryer in a small farm, for the recovery of exhaust gases from thermal power plants.

Rotary drying process modeling and online compensation

2015 ◽  
Vol 41 ◽  
pp. 38-46 ◽  
Author(s):  
Xin Wang ◽  
Bin Qin ◽  
Haijun Xu ◽  
Wanli Zhu
Keyword(s):  
Process Modeling ◽  
Drying Process ◽  
Rotary Drying

Cogeneration: An Example Within the Citrus Industry

1979 ◽  
Author(s):  
Dennis D. Weimer
Keyword(s):  
Large Scale ◽  
Waste Heat ◽  
Electrical Power ◽  
Electric Utility ◽  
Tax Credits ◽  
Citrus Industry ◽  
Industrial Plants ◽  
Potential Benefits ◽  
Utility Rate ◽  
The Many

Since the word “cogeneration” was coined in President Carter’s energy message to Congress in April 1977, most articles covering the topic have dealt with defining its meaning, estimating the quantity of recoverable waste heat energy in various industrial segments, and describing the many drawbacks, i. e., federal energy policy, electric utility rate structures, tax credits, etc. associated with major industrial-utility co-operative power generation concepts. So much emphasis has been placed on the problems of large scale cogeneration projects that many operating industrial plants either lose sight of the potential benefits obtained by generating their own electrical power or shy away from the subject altogether. Paper published with permission.

Computer Simulation of Drying Process in Tube Rotary Dryer

2012 ◽  
Vol 201-202 ◽  
pp. 617-620
Author(s):  
Hua Bo He
Keyword(s):  
Heat Transfer ◽  
Computer Simulation ◽  
Object Oriented ◽  
Simulation Software ◽  
Object Oriented Programming ◽  
Transfer Model ◽  
Drying Process ◽  
Rotary Dryer ◽  
Windows Xp ◽  
Actual Test

With the particle transfer model and object-oriented programming method, the initiatory computer simulation software of indirect drying process is developed in windows XP system and MFC environment. The overall coefficient of heat transfer in the drying process and the changes of material humidity and temperature between the inlet and outlet are calculated by the simulation software. The actual test data verify that the computer simulation software is convenient, effective and reliable.

Energy Reduction of Refined Sugar Drying Process in Rotary Dryer and Conditioning Silo Consolidate

2013 ◽  
Vol 805-806 ◽  
pp. 633-636 ◽  
Author(s):  
Chamlong Phoosodsoong ◽  
Chanoknun Sookkumnerd
Keyword(s):  
Significant Variation ◽  
Transfer Rate ◽  
Energy Reduction ◽  
Drying Process ◽  
Hot Air ◽  
Perfect Performance ◽  
Conditioning Process ◽  
Rotary Dryer ◽  
Low Humidity

Amount of water content in fresh air phenomena direct heat affect to be changed fresh air to hot air state for reducing refined sugar moisture during drying and conditioning process. A change relative humidity of air results in a significant variation of heat transfer rate. Therefore, in this research energy reduction of refined sugar drying and conditioning process study of these phenomena was conducted both experimentally and theoretically. Several experiments was performed employing a rotary dryer and a conditioning silo. In each experiment one of the air moisture content was changed and the resulting consumption of steam changed on the process was measured. The objective of this research was to reduce exhaust steam to heated up fresh air to hot air by installing dehumidifier. Evaluation of these results showed that the low humidity of fresh air are well suited for applied of refined sugar drying process, giving the perfect performance in which quality of refined sugar impacted can be eliminated and reduction of energy can thereby improve, with the aim of enhancing energy saving.

Parameters Optimization of Rotary Drying by Uniform Design

2013 ◽  
Vol 448-453 ◽  
pp. 3523-3531
Author(s):  
Jing Ma ◽  
Xiao Long Lei ◽  
Rong Chao Ma
Keyword(s):  
Experimental Design ◽  
Residence Time ◽  
Inclination Angle ◽  
Rotation Speed ◽  
Uniform Design ◽  
Solid Particles ◽  
Structural Parameter ◽  
Feed Speed ◽  
Rotary Dryer ◽  
Rotary Drying

In order to optimize the structure and technology parameters of rotary drying, mathematical models of effective residence time and mass of loading were established based on the motion of solid particles in rotary dryer. Uniform design was applied in experimental design with material of rapeseed. Four independent variables such as structural parameter (cylinder inclination angle) and operating parameters (the rotation speed of rotary dryer, solids feed speed and airflow speed) were investigated. Prediction models of effective residence time and mass of loading were established by using software DPS7.05 to optimize the experimental design. The experiment results showed that under experimental conditions, the effects of airflow speed, rotation speed, the interaction of rotation speed with airflow speed and the interaction of rotation speed with solids feed speed on effective residence time were significant. Rotation speed, airflow speed, the interaction of cylinder inclination angle with solids feed speed and the interaction of feed speed with airflow speed had significant influences on mass of loading. By optimizing with multiple objective programming, the optimal parameters were obtained as follow: cylinder inclination angle of 1.8°, rotation speed of rotary dryer of 4 r/min, solids feed speed of 2.5 kg/s and airflow speed of 2.4 m/s. The research has important significance to well improve structure and technology parameters of rotary drying technology in solids drying.

An Investigation of Radiant Heat Distribution on Drying Area in the Chamber of Infrared Rotary Dryer

2014 ◽  
Vol 1044-1045 ◽  
pp. 232-235
Author(s):  
J. Laohavanich ◽  
S. Yangyuen ◽  
N. Thowjantuek
Keyword(s):  
Surface Temperature ◽  
Near Infrared ◽  
Longitudinal Direction ◽  
Radiant Heat ◽  
Contour Plot ◽  
Heat Distribution ◽  
Factors Affecting ◽  
Rotary Dryer ◽  
Near Infrared Ray ◽  
Rotary Drying

An investigation of radiant heat distribution on drying area in the chamber of infrared-rotary dryer (IRD) was conducted by measuring the values of infrared radiation on drum surface of the dryer chamber and then showed in term of surface temperature (ST). A gas-fired infrared burner (GIB) was used as the heat source, radiated the electromagnetic wave in the length of near-infrared ray. The drum surface was set as an infrared radiant absorbing area, installed with type K thermocouples and set as grid. Different levels of drum diameters (D=700, 900 and 1100 mm.), infrared peak wavelengths (IRP=3.32, 2.97 and 2.70 micron), distances between GIB and drum surface (H=300, 400 and 500 mm.), grid positions on drum surface (longitudinal direction (L) and radial direction (W) = 900 x 900 mm2) were applied. Then, distribution of surface temperature values was analyzed, based on response surface methodology (RSM) obtained from a second order polynomial model. The results showed that IR and H were the main factors affecting the radiant heat distribution. Then, the surface plots of ST levels on the absorbing drum surfaces in the rotary drying chamber were constructed. The contour plot results were indicative of a use for the design and selection of an appropriate size of area for drying with uniform distribution of IR in accordance with user-defined parameters.

scholarly journals A new procedure for the treatment of an industrial waste containing flotation reagents

2014 ◽  
Vol 68 (3) ◽  
pp. 331-339 ◽  
Author(s):  
Milutin Milosavljevic ◽  
Dusan Mijin ◽  
Sandra Konstantinovic ◽  
Natasa Elezovic ◽  
Ljiljana Takic ◽  
...  
Keyword(s):  
Industrial Waste ◽  
Waste Treatment ◽  
Thioglycolic Acid ◽  
Reaction Times ◽  
Industrial Process ◽  
Drying Process ◽  
Laboratory Procedure ◽  
Flotation Reagents ◽  
Industrial Plants ◽  
Laboratory Synthesis

Flotation reagents can be transformed to industrial waste if they are stored for a long period of time. Also, if synthesis or drying process is not performed under defined conditions in industrial plants, which produce flotation reagents, batch of waste may arise and be stored as a waste. The chemical composition of this waste depends on the phase in which it was created, but typically includes: unreacted alkali hydroxide, solvent - alcohol and trithiocarbonate and oxidation product - dixanthogenate. In this paper a new laboratory procedure for the treatment of such wastes is described. The identification and separation of industrial waste components is also included. From the separated dixantogenate and xanthate a laboratory synthesis of thioncarbamates is given. In addition, a semi-industrial treatment of waste xanthate is presented. Synthesis of N-alkyl and N,N-dialkyl-O-isobutylthioncarbamates were obtained from the filtrate obtained in the first step. As a by-product, sodium thioglycolate was produced. This by-product is transformed to a thioglycolic acid by the addition of an acid. Also, the synthesis of thioncarbamates from dixanthogenates, isolated from industrial waste as a cake, is desribed. Described waste treatment is additionally interesting due to the production of sulphur as another by-product. Laboratory synthesis gave thioncarbamates in yields from 69.7 to 87.7 %, while the semi-industrial process for the selected batches produced thioncarbamates in yields from 74.2 to 80.5 %. Taking into account the importance of the synthesized compounds as selective flotation reagents, a new procedure of their synthesis from industrial waste is characterized by good yields and purity of the obtained compounds, the simplicity of process, low environmental impact and short reaction times of synthesis.

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