Experimental Study on the Xilingol Lignite Dewatering in Microwave Field

2013 ◽  
Vol 868 ◽  
pp. 442-446
Author(s):  
Wei Dong Wang ◽  
Xiao Yang ◽  
Jing Wen ◽  
Meng Hui Lu ◽  
Chen Gao ◽  
...  
Keyword(s):  
Microwave Field ◽  
Size Composition ◽  
Microwave Drying ◽  
Drying Rate ◽  
Drying Characteristics ◽  
Fine Coal ◽  
Mass Losses ◽  
Drying Rates ◽  
Drying Curves ◽  
Superficial Area

Microwave drying characteristics of Xilingol lignite were investigated with microwave drying testing equipment at 2450 MHz. Effects of particle size has been carefully studied. Mass losses of the samples were measured during drying. Drying rates were then obtained through the trends of drying curves. Results show the 0.6-1mm sample has low drying rate. Changing the stacking superficial area and size composition has been tested and resulted that only mixed with fine coal can increase the drying rate of 0.6-1mm. But classification experiment shows sieving 0-6mm sample into fine sample and coarse sample cannot advance the drying rate obviously.

The thin-layer drying characteristics of sewage sludge by the appropriate foaming pretreatment

2014 ◽  
Vol 69 (9) ◽  
pp. 1859-1866 ◽  
Author(s):  
Hui-Ling Wang ◽  
Zhao-Hui Yang ◽  
Jing Huang ◽  
Li-Ke Wang ◽  
Cheng-Liu Gou ◽  
...  
Keyword(s):  
Sample Thickness ◽  
Coefficient Of Determination ◽  
Drying Rate ◽  
Drying Time ◽  
Drying Characteristics ◽  
Thin Layer Drying ◽  
Dewatered Sludge ◽  
Drying Curves ◽  
Sludge Drying ◽  
The Impact

As dewatered sludge is highly viscous and sticky, the combination of foaming pretreatment and drying process seems to be an alternative method to improve the drying performance of dewatered sludge. In this study, CaO addition followed by mechanical whipping was employed for foaming the dewatered sludge. It was found that the foams were stable and the diameters of bubbles mainly ranged from 0.1 to 0.3 mm. The drying experiments were carried out in a drying oven in the convective mode. The results indicated that foamed sludge at 0.70 g/cm3 had the best drying performance at each level of temperature, which could save 35–45% drying time to reach 20% moisture content compared with the non-foamed sludge. The drying rate of foamed sludge at 0.70 g/cm3 was improved with the increasing of drying temperature. The impact of sample thickness on drying rate was not obvious when the sample thickness increased from 2 to 8 mm. Different mathematical models were used for the simulation of foamed sludge drying curves. The Wang and Singh model represented the drying characteristics better than other models with coefficient of determination values over 0.99.

Drying Characteristics of Graininess Agar under Infrared Ray and its Kinetics Model

2013 ◽  
Vol 663 ◽  
pp. 291-296
Author(s):  
Lei Yang ◽  
Qian Qian Ouyang ◽  
Si Dong Li
Keyword(s):  
High Efficiency ◽  
Linear Regression Analysis ◽  
Drying Rate ◽  
Analysis Program ◽  
Drying Method ◽  
Drying Characteristics ◽  
Low Energy Consumption ◽  
Different Temperatures ◽  
Drying Models ◽  
Drying Rates

In order to look for a low-energy–consumption and high-efficiency drying method, the drying characteristics of agar under infrared ray were studied. The results show that temperature has more obvious influence than granularity on the drying rate of agar. With the increase of temperature, the drying rate increases. The agar granularity does not have a significant influence on the drying rate. Comparisons of different drying models at different temperatures were made through linear regression analysis program. The results show that the drying procedure of agar under infrared ray can accurately be described by the Page model, and the drying rates and moisture contents at different drying stages can also be easily estimated with it.

Study on Microwave Drying Process and Drying Characteristics of Sewage Sludge

2013 ◽  
Vol 838-841 ◽  
pp. 2643-2647
Author(s):  
Jin Ping Li ◽  
Meng Yao Li ◽  
Wen Yao ◽  
Ni Wang
Keyword(s):  
Energy Consumption ◽  
Sewage Sludge ◽  
Lower Energy ◽  
Microwave Drying ◽  
Drying Rate ◽  
Municipal Sludge ◽  
Drying Process ◽  
Drying Characteristics ◽  
Pretreatment Time ◽  
Short Time

Combination of oven and microwave and only oven are two ways to study municipal sludge,and it investigates whether different size, microwave drying pretreatment, pretreatment time and oven temperature characteristics have effect on drying characteristics. The results shows that: using microwave to dry sludge need short time, the drying rate is fast, combination of oven and microwave has higher drying rate and lower energy consumption than only oven.

scholarly journals Potential of microwave drying technology for increase drying rate and physical quality of kaffir lime (Citrus hystrix DC) leaves

2021 ◽  
Vol 924 (1) ◽  
pp. 012045
Author(s):  
F Su’aidah ◽  
I Taruna
Keyword(s):  
Moisture Content ◽  
Power Level ◽  
Preference Test ◽  
Color Difference ◽  
Microwave Drying ◽  
Drying Rate ◽  
Physical Quality ◽  
Oven Drying ◽  
Drying Rates

Abstract The effects of microwave power on microwave drying rates and the physical quality of kaffir lime leaves were studied. Three power levels were used in this study, high (723 watts), medium (537 watts), and low (420 watts). The moisture content, drying rate, color (L, a, b), and organoleptic parameters of each power level will be compared with the oven drying method (60°C). The result shows that the final moisture content of the high, medium, and low power of microwave drying are 6.06, 4.26%, and 6.16%db respectively, which is lower than oven drying, 16.62%db. Besides, the drying rate of microwave drying is 26.39-48.71%db/minute, higher than oven drying 0.32%db/minute. Dried kaffir lime leaves with medium level power (537 watt) has the lowest color difference (ΔE = 1.0 ± 0.29) compared to fresh leaves. While, the color and aromatic preference test dried kaffir lime leaves by microwave drying was preferable than oven drying.

Impact of Fruit Ripeness on Physicochemical Properties and Convective Drying Characteristics of Kent Mango (Mangifera indica L. cv. 'Kent')

2011 ◽  
Vol 7 (3) ◽  
Author(s):  
Alfa Oumar Dissa ◽  
Hélène Desmorieux ◽  
Pascal Degraeve ◽  
Joseph Bathiebo ◽  
Jean Koulidiati
Keyword(s):  
Natural Convection ◽  
Thermal Diffusivity ◽  
Mangifera Indica ◽  
Soluble Solids ◽  
Convective Drying ◽  
Drying Characteristics ◽  
Mass Diffusivity ◽  
Drying Rates ◽  
Drying Curves ◽  
Time Required

Impact of ripeness on drying characteristics of mango was studied by considering different zones on the fruit. For each zone, ripeness was estimated by total soluble solids/acidity ratio, colour and texture of fruit flesh. For each state of ripeness, drying curves and time-temperature curves were established both in forced and natural convection. Mass diffusivity (estimated by considering two diffusion regions), thermal diffusivity and drying rates were deduced from these drying curves by considering product shrinkage. Results showed that the time required to reduce moisture content to any given level depended on the ripeness state, being highest for unripe samples and lowest for ripe samples. At each drying moment, temperature of ripe sample was higher than that of unripe sample. Mass diffusivity, thermal diffusivity and drying rates strongly increased with ripeness state. At 60°C, unripe and ripe fruit mass diffusivities ranged respectively from 1.69x10-10 to 9.87x10-10 m²/s and 3.38x10-10 to 1.77x10-9 m²/s. Thermal diffusivities ranged from 2.12 x10-11 to 6.44x10-10 m²/s and 2.74x10-10 to 8.05 x10-10 m²/s respectively for unripe and ripe samples. In natural convection, drying rates reached maximal values of 0.16 kg m-2 s for unripe sample and 0.47 kg m-2 s for ripe sample whereas in forced convection they reached respectively 0.43 and 0.67 kg m-2 s. Product shrinkage decreased with ripeness and was almost ideal for the major part of the drying process. Constants of suitable fitting models also varied considerably with fruit ripeness. This work showed that ripeness state influences strongly drying characteristics of mango fruit.

scholarly journals Microwave Drying Characteristics and Drying Quality Analysis of Corn in China

Processes ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 1511
Author(s):  
Haili Liu ◽  
Haoyu Liu ◽  
Heyun Liu ◽  
Xu Zhang ◽  
Qingchao Hong ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Microwave Power ◽  
Early Stage ◽  
Microwave Drying ◽  
Quality Analysis ◽  
Drying Rate ◽  
Drying Characteristics ◽  
Drying Conditions ◽  
Opposite Tendency

To identify the microwave drying characteristics of corn, microwave drying tests were conducted on corn. By taking the moisture content, drying rate, and drying temperature as indices, this research revealed the effects of different microwave powers and loads on the microwave drying characteristics of corn. Moreover, energy consumption and quality of dried corn were analysed under different drying conditions. The results demonstrate that microwave drying has significant energy-saving effects. The energy consumption by microwave drying is less than 0.3 times that used by electrothermal drying under the same load. Both microwave power and load exert significant influences on drying characteristics. Higher microwave power results in a greater average drying rate, wherein shorter periods of time are required to reach the maximum drying rate and higher temperatures of the corn. However, the load shows the opposite tendency. The smaller the load, the higher the temperature of the corn in the early stage of drying. However, as drying continues, the temperature curve changes significantly, and the temperature rises with the increase in load in the later stage of drying. In consideration of energy consumption and dried quality, the load of corn should be increased as appropriate, and the microwave intensity should be limited to no higher than 0.7 W/g in the experiment.

Modelling of the Drying Kinetics of Opuntia Ficus Indica Fruits and Cladodes

2010 ◽  
Vol 6 (2) ◽  
Author(s):  
Amira Touil ◽  
Saber Chemkhi ◽  
Fethi Zagrouba
Keyword(s):  
Prickly Pear ◽  
Drying Rate ◽  
Pear Fruit ◽  
Opuntia Ficus Indica ◽  
Rate Period ◽  
Different Temperatures ◽  
Drying Rates ◽  
Drying Behaviour ◽  
Drying Curves ◽  
Kinetics Of

The effect of the drying rates of fruit and cladode of Opuntia Ficus Indica was examined at different temperatures. The experimental drying curves show only a falling drying rate period. The values of drying rate of prickly pear (fruit and cladode) almost doubled when the drying temperature was increased from 40 to 60°C. The experimental drying data were applied to various drying equation (Logarithmic; Wang and Singh, Henderson and Pabis, MMF model and Midilli equation). Midilli equation was optimal for characterizing drying behaviour of prickly pear for the whole range of temperature with a correlation coefficient of 99.99% for the fruit and the cladode and a standard error of 0.0015 for the fruit and 0.0017 for the cladode.

Microwave Drying Characteristics and Antidiabetic Properties of Aquilaria subintegra and Aquilaria malaccensis Leaves

2015 ◽  
Vol 1113 ◽  
pp. 352-357 ◽  
Author(s):  
Sxureha Yunus ◽  
Nurul Asyikin Md Zaki ◽  
Ku Halim Ku Hamid
Keyword(s):  
Power Level ◽  
Microwave Treatment ◽  
Microwave Drying ◽  
Drying Time ◽  
Drying Characteristics ◽  
Aquilaria Malaccensis ◽  
Treatment Of Diabetes ◽  
Drying Curves ◽  
Vitro Analysis

The present study was aimed to investigate the effect of microwave drying on the anti-diabetic potential of the leaves of Aquilaria subintegra and Aquilaria malaccensis with regard to its efficacy by local herbalists in the treatment of diabetes frailties. The drying process was carried out at 50, 100 and 150 W, and the drying curves were developed to analyse the drying characteristics of both species of Aquilaria leaves. Solid-liquid extraction was done by using ethanol as solvent prior to in-vitro analysis of the inhibition activity on α-amylase. Following that, HPLC and FTIR were done to support findings on the antidiabetic compounds of the leaves extract. The results indicated that an increase in power level will reduce the drying time during microwave treatment. Findings showed that both species of Aquilaria leaves extract could remarkably inhibit the activity of α-amylase and provide a rationale for the use of the leaves in the treatment of diabetes mellitus.

Microwave Drying Characteristics of Soybeans in Single and Variable Microwave Power Density

2017 ◽  
Vol 13 (4) ◽  
Author(s):  
Ruifang Wang ◽  
Lijuan Zhang ◽  
Kun Lei ◽  
Qing Xu ◽  
Wei Tian ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Power Density ◽  
Microwave Power ◽  
Lower Energy ◽  
Microwave Drying ◽  
Drying Rate ◽  
Drying Process ◽  
Drying Characteristics ◽  
Single Power ◽  
Energy Aspects

Abstract Drying characteristics of soybeans under different microwave (MW) processing schemes were studied in regard to energy aspects. For drying in a single microwave power density, the experiments were carried out at a constant MW output power throughout the process. It was found that the drying rate is enhanced together with reduced energy consumption at higher single power density, but the soybean cracking ratio is increased gradually from 2 % to 40 % when the power density was changed from 0.2 W/g to 0.8 W/g. Efforts were made to reach a compromise between the drying rate and dried soybean quality by varying the MW power density in several steps overall the drying process, but soybean cracking occurred at a higher ratio due to the fluctuation of drying rate. Microwave drying of soybeans under the power density less than 0.2 W/g with slow and stable drying rate can achieve the soybean cracking ratio controlled within 5 % and lower energy consumption.

Convective-cum-Microwave Drying Characteristics of Ginger (Zingiber officinale)

2017 ◽  
Vol 8 (1) ◽  
pp. 153-159
Author(s):  
Sunanda ◽  
◽  
Satish Kumar ◽  
H. G. Ramya ◽  
M. S. Alam ◽  
...  
Keyword(s):  
Zingiber Officinale ◽  
Microwave Drying ◽  
Drying Characteristics
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