scholarly journals Rapid Drying of High-Moisture Paddy Using a Pneumatic Dryer with Corrugated-Surface Drying Column

2020 ◽  
Vol 141 ◽  
pp. 01006
Author(s):  
Chatchai Nimmol ◽  
Aswin Yodrux ◽  
Anucha Hirunwat
Keyword(s):  
Energy Consumption ◽  
Energy Utilization ◽  
Drying Process ◽  
High Moisture ◽  
Corrugated Surface ◽  
First Pass ◽  
Drying System ◽  
Surface Drying ◽  
Different Characteristics ◽  
Surface Length

Combination of corrugated-surface drying column and multipass drying concept (first-pass and second-pass drying) was made to increase the performance of a pneumatic dryer for high-moisture paddy. In this study, different characteristics of the drying column, which could be characterized by the ratio between the corrugated-surface length (C) and the total length (L) of the drying column (or C/L), were proposed. The influences of drying temperature (120oC, 150oC, and 180oC) and value of C/L (0, 0.5 and 1.0) on the dryer performance and energy utilization of the drying process were disscussed. The drying column with a higher value of C/L had higher potential for increasing dryer performance. For the first-pass drying, the drying system using the drying column with corrugated surface could reduce the energy consumption by 14% to 44% compared with the drying system using the drying column without corrugated surface. For the second-pass drying, the drying system using the drying column with corrugated surface consumed more energy, however. The moisture reduction of paddy could also be significantly increased after the second-pass drying.

Performance, Energy, and Product Quality Aspects of a Modified Pneumatic Dryer for Rapid Drying of High-Moisture Paddy

2019 ◽  
Vol 62 (6) ◽  
pp. 1531-1539 ◽  
Author(s):  
Chatchai Nimmol
Keyword(s):  
Surface Roughness ◽  
Energy Utilization ◽  
Drying Process ◽  
Milled Rice ◽  
Drying Temperature ◽  
Milling Quality ◽  
Corrugated Surface ◽  
Head Rice ◽  
First Pass ◽  
L Value

The application of surface roughness on the drying column was combined with a multipass drying concept (first-pass and second-pass drying) to improve the performance and energy utilization of a conventional pneumatic dryer during rapid drying of high-moisture paddy. The surface roughness on the drying column was characterized by the ratio of the corrugated surface length (C) to the total length (L) of the column (i.e., C/L). The effects of drying temperature (120°C, 150°C, and 180°C) and C/L value (0, 0.5, and 1.0) on the dryer performance, energy utilization of the drying process, and rice milling quality were determined. The drying column with a higher C/L value had higher potential for improving the dryer performance and energy utilization of the drying process. For first-pass drying, a drying column with C/L values of 0.5 and 1.0 could reduce energy consumption by 14% to 17% and by 41% to 44%, respectively, compared with a column without a corrugated surface (C/L = 0). However, for second-pass drying, the drying system that used a drying column with a corrugated surface consumed more energy. The moisture content reduction of paddy could also be significantly increased after second-pass drying. For both first-pass and second-pass drying, a higher drying temperature and higher C/L value resulted in a lower head rice yield from the milled rice, while the effects of drying temperature and C/L value on the whiteness value of the milled rice were found to be insignificant.HighlightsCharacteristics of the drying column had more significant effects on the dryer performance and energy utilization than the drying temperature.A drying column with C/L = 1 (totally corrugated surface) showed significant potential for increasing the dryer performance and energy utilization of the drying process.A drying column with a higher C/L value may not be necessary for paddy with a small amount of surface moisture.Multipass drying of paddy using a pneumatic dryer is not suggested due to the significant reduction in head rice yield. Keywords: Drying column, Energy utilization, Milling quality, Multipass drying, Pneumatic dryer, Surface roughness.

scholarly journals Study on the Variable-Temperature Drying Process of Corn Drying in an Industrial Corn-Drying System Equipped with a Self-Adaptive Control Heat Exchanger

2021 ◽  
Vol 11 (6) ◽  
pp. 2772
Author(s):  
Bin Li ◽  
Zhiheng Zeng ◽  
Xuefeng Zhang ◽  
Ye Zhang
Keyword(s):  
Adaptive Control ◽  
Energy Consumption ◽  
Heat Loss ◽  
Thermal Performance ◽  
Variable Temperature ◽  
The Other ◽  
Drying Process ◽  
Drying Kinetic ◽  
Drying System ◽  
Self Adaptive

To realize energy-saving and efficient industrial grain drying, the present work studied the variable-temperature drying process of corn drying in a novel industrial corn-drying system with a heat recycling and self-adaptive control function. The drying kinetics, thermal performance, heat-loss characteristics and the heat-recycling performance of the drying system under different allocations between flue gas and hot air were investigated, and the optimized drying process was proposed and compared with two constant drying processes. The results showed that the optimized drying process exhibited better drying kinetic and thermal performance than the two constant drying processes. More specifically, the total heat loss, total energy consumption and specific energy consumption of the optimized drying process were ascertained to be 36,132.85 MJ, 48,803.99 MJ and 7290.27 kJ/kg, respectively, which were lower than those of the other two processes. On the other hand, the thermal efficiency of the drying chamber for the optimized drying process was ascertained to be varied within the range of 6.81–41.71%. Overall, the validation results showed that the optimized drying process can significantly improve the drying performance of the drying system.

scholarly journals Drying of Drill Cuttings: Emphasis on Energy Consumption and Thermal Analysis

Processes ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 145 ◽  
Author(s):  
Esra Tınmaz Köse
Keyword(s):  
Energy Consumption ◽  
Moisture Content ◽  
Conveyor Belt ◽  
Drilling Fluids ◽  
High Moisture Content ◽  
High Moisture ◽  
Drill Cuttings ◽  
Sanitary Landfills ◽  
Drying System ◽  
Time And Energy

Drill cuttings, contaminated with drilling fluids, are characterized by their high moisture content, which can cause problems for collection, storage, and transportation. Additionally, the practice of disposing waste with high moisture content into sanitary landfills is undesirable and mostly forbidden. For that reason, drying of waste with high moisture content, such as drill cuttings, is an essential operation. In this work, microwave and conveyor belt drying processes for drying drill cuttings containing water-based drilling fluids were examined in a lab-scale study. The results of the study indicated that the microwave dryer has been shown to be advantageous in terms of time and energy consumption for drying of thin film layers, while the conveyor drying system was more appropriate for bulk drying.

Temperature Simulation and Control System for Automobile Coating Line Drying Rooms

2015 ◽  
Author(s):  
Zhaoliang Jiang ◽  
Wenping Liu ◽  
Qingyue Wei ◽  
Zhishen Li
Keyword(s):  
Energy Loss ◽  
Manufacturing Systems ◽  
Energy Utilization ◽  
Regulation System ◽  
Drying Process ◽  
Automobile Body ◽  
Product Manufacturing ◽  
Drying System ◽  
And Control ◽  
Coating Line

Product manufacturing systems are one of the largest energy consumers. Focusing on the production of the automobile body coating in particular, the authors investigate the drying system of coating line to improve the energy efficiency during the drying process of the parts. First, The flow field of a drying room is simulated with FEM. Then, an applicable regulation system for controlling the energy loss is built. The proposed method effectively improves the energy utilization of the drying system; thus, decreasing energy loss.

scholarly journals Intermittence periods in corn seed drying process

2018 ◽  
Vol 40 (2) ◽  
pp. 193-198 ◽  
Author(s):  
Rafael de Oliveira Vergara ◽  
André Fernandes Capilheira ◽  
Gizele Ingrid Gadotti ◽  
Francisco Amaral Villela
Keyword(s):  
Moisture Content ◽  
Average Moisture Content ◽  
Maturity Stage ◽  
Drying Process ◽  
High Moisture Content ◽  
High Moisture ◽  
Corn Seed ◽  
Physiological Quality ◽  
Drying System

Abstract: The high quality is a factor that must be assured in a corn seed production system. In order to achieve this, seeds are harvested with high moisture content, and then artificially dried. However, the costs of this operation are high and may reduce the profits. The objective of the present study was to evaluate, through the physiological quality, the possibility of using intermittence periods for drying corn seeds on the cob in a stationary system. The seeds were harvested on the cob, close to the physiological maturity stage, with an average moisture content of 35%. The treatments consisted of four periods of intermittence (3, 6 and 9 hours) and one period without intermittence. The seeds were stored for six months. To evaluate the physiological quality of the seeds, germination, first germination, electrical conductivity, and the cold tests were performed. The experimental design was completely randomized, in split plots. In a stationary drying system, periods of intermittence of up to 6 hours per day helped to preserve the physiological quality of the corn seeds. The use of intermittence periods in the drying process provides corn seeds with higher physiological quality and greater storage potential, in comparison with the continuous drying.

Design and Analysis of Concentrated Solar-Energy Assisted Paddle Dryers

2014 ◽  
Vol 353 ◽  
pp. 73-78
Author(s):  
Jiang Yong Du ◽  
Xin Zhi Liu ◽  
Hou Lei Zhang
Keyword(s):  
Energy Consumption ◽  
Solar Energy ◽  
Critical Issue ◽  
Storage Tanks ◽  
System Configuration ◽  
Drying Process ◽  
Concentrated Solar Energy ◽  
Drying System ◽  
Drying Technology ◽  
Radiation Conditions

Paddle dryer, one kind of indirect dryers, is widely used in removing moisture content of many materials, such as brown coal, sewage sludge, and biomass. For many applications, the materials to be dried are low-valued or even wastes, so the drying energy consumption becomes the critical issue. One way to reduce the energy consumption is to introduce solar-drying technology. In this paper, firstly, we present a paddle dryer system configuration with concentrated solar energy (CSE) device, which consists of trough-type collectors, thermal storage tanks and auxiliary parts. Then a calculating model is developed to design the drying system. Examples with typical solar radiation conditions in Nanjing, China are illustrated. The energy-saving rate (η), i.e. the ratio of the provided solar energy to the total energy required by the drying process on one-day basis, is evaluated. The developed lab prototype is finally described in brief.

Konsumsi Energi Pada Alat Pengering Surya dan Tipe Bak Untuk Pengeringan Biji Kakao

2019 ◽  
Vol 17 (3) ◽  
Author(s):  
Lamhot P. Manalu
Keyword(s):  
Specific Energy ◽  
Fossil Fuels ◽  
Negative Impact ◽  
Solar Irradiation ◽  
Drying Process ◽  
Food Industries ◽  
Solar Dryer ◽  
Agricultural Applications ◽  
Drying System ◽  
Drying Efficiency

Crop drying is essential for preservation in agricultural applications. It is performed either using fossil fuels in an artificial mechanical drying process or by placing the crop under the open sun. The first method is costly and has a negative impact on the environment, while the second method is totally dependent on the weather. The drying process requires a lot of energy in relation to the amount of water that must be evaporated from the product. It is estimated that 12% of the total energy used by the food industries and agriculture absorbed in this process. Due to the limitation of energy resources, it is important to keep researching and developing of diversification and optimization of energy This study aims to assess the use of energy for cocoa drying using solar energy dryer and bin-type dryer, as well as to determine the drying efficiency of each type of dryer. The results showed that the efficiency of the solar dryer drying system ranges between 36% to 46%, while the tub-type dryers between 21.7% to 33.1%. The specific energy of solar dryer ranged from 6.17-7.87 MJ / kg, while the tub-type dryers 8.58-13.63 MJ / kg. Dryer efficiency is influenced by the level of solar irradiation and the amount of drying load, the higher the irradiation received and more cocoa beans are dried, the drying efficiency is also higher and the specific energy further down.Proses pengeringan memerlukan banyak energi sehubungan dengan banyaknya air yang harus diuapkan dari bahan yang dikeringkan. Pengeringan dapat dilakukan dengan menggunakan pengering mekanis berbahan bakar fosil atau dengan menempatkan produk di bawah matahari terbuka. Metode pertama adalah mahal dan memiliki dampak negatif pada lingkungan, sedangkan metode kedua sangat tergantung pada cuaca. Diperkirakan bahwa 12% dari total energi yang dipergunakan oleh industri pangan dan pertanian diserap untuk proses ini. Mengingat semakin terbatasnya sumber energi bahan bakar minyak maka usaha diversifikasi dan optimasi energi untuk pengeringan perlu terus diteliti dan dikembangkan. Salah satunya adalah pemanfaatan energi surya sebagai sumber energi terbarukan. Penelitian ini bertujuan untuk mengkaji penggunaan energi untuk pengeringan kakao dengan memakai pengering energi surya dan pengering tipe bak, serta untuk mengetahui efisiensi pengeringan dari masing-masing tipe pengering. Hasil kajian menunjukkan bahwa efisiensi total sistem pengeringan alat pengering surya berkisar antara 36% dan 46%, sedangkan pengering tipe bak antara 21.7% dan 33.1%. Kebutuhan energi spesifik alat pengering surya berkisar antara 6.17-7.87 MJ/kg, sedangkan alat pengering tipe bak 8.58-13.63 MJ/kg. Efisiensi alat pengering dipengaruhi oleh tingkat iradiasi surya dan jumlah beban pengeringan, semakin tinggi iradiasi yang diterima pengering serta semakin banyak biji kakao yang dikeringkan, maka efisiensi pengeringan juga semakin tinggi dan kebutuhan energi spesifik semakin turun.Keywords: energy, efficiency, cocoa, solar dryer, bin-type dryer.

scholarly journals Experimental and Numerical Investigations on Conductive Drying of Phosphate Washing Waste Clay

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 482
Author(s):  
Fatiha Berroug ◽  
Yassir Bellaziz ◽  
Naaila Ouazzani ◽  
Fatima Ait Nouh ◽  
Abdessamad Hejjaj ◽  
...  
Keyword(s):  
Scale Up ◽  
Free Water ◽  
Moisture Diffusivity ◽  
Sample Thickness ◽  
Total Production ◽  
Drying Process ◽  
One Dimensional ◽  
Numerical Investigations ◽  
The World ◽  
Drying System

Morocco is the leading producer of phosphate and its derivatives in the world with a total production of 35 Mt. However, the extraction and the valorization of this mine generate huge quantities of phosphate washing waste clay (PHWWC) that constitute a main environmental and economic concern. To facilitate this waste clay storage and handling, it is necessary to decrease its moisture content that represents 80% of PHWWC. The present paper is devoted to studying the conductive drying of PHWWC. Drying experiments were conducted in a laboratory pilot. Afterwards, the experiment results were implemented in a one-dimensional numerical model of heat and mass transfer in a porous media to identify the drying parameters and performances. It was found that most of the water contained in PHWWC is free water that is removed with a constant drying rate. The volume reduction with a marked cracks phenomenon attained 65% without any significant effect of drying temperature and sample thickness. The effective moisture diffusivity of the PHWWC for a conductive drying process is ranged between 10−9 and 1.1 × 10−8 m2·s−1. The thermal efficiency of the drying system is up to 86%. The results could be used for the purpose of design and scale-up of the industrial dryer based on laboratory-scale experiments.

scholarly journals Energetic and exergetic analysis of a convective drier: A case study of potato drying process

2020 ◽  
Vol 5 (1) ◽  
pp. 563-572
Author(s):  
Iman Golpour ◽  
Mohammad Kaveh ◽  
Reza Amiri Chayjan ◽  
Raquel P. F. Guiné
Keyword(s):  
Energy Consumption ◽  
Research Work ◽  
Specific Energy Consumption ◽  
Exergy Efficiency ◽  
Operating Conditions ◽  
Energy Utilization ◽  
Convective Drying ◽  
Drying Time ◽  
Energy And Exergy ◽  
Exergy Losses

AbstractThis research work focused on the evaluation of energy and exergy in the convective drying of potato slices. Experiments were conducted at four air temperatures (40, 50, 60 and 70°C) and three air velocities (0.5, 1.0 and 1.5 m/s) in a convective dryer, with circulating heated air. Freshly harvested potatoes with initial moisture content (MC) of 79.9% wet basis were used in this research. The influence of temperature and air velocity was investigated in terms of energy and exergy (energy utilization [EU], energy utilization ratio [EUR], exergy losses and exergy efficiency). The calculations for energy and exergy were based on the first and second laws of thermodynamics. Results indicated that EU, EUR and exergy losses decreased along drying time, while exergy efficiency increased. The specific energy consumption (SEC) varied from 1.94 × 105 to 3.14 × 105 kJ/kg. The exergy loss varied in the range of 0.006 to 0.036 kJ/s and the maximum exergy efficiency obtained was 85.85% at 70°C and 0.5 m/s, while minimum exergy efficiency was 57.07% at 40°C and 1.5 m/s. Moreover, the values of exergetic improvement potential (IP) rate changed between 0.0016 and 0.0046 kJ/s and the highest value occurred for drying at 70°C and 1.5 m/s, whereas the lowest value was for 70°C and 0.5 m/s. As a result, this knowledge will allow the optimization of convective dryers, when operating for the drying of this food product or others, as well as choosing the most appropriate operating conditions that cause the reduction of energy consumption, irreversibilities and losses in the industrial convective drying processes.

Sign in / Sign up

Export Citation Format

Share Document