scholarly journals Ultrasound assisted low temperature drying of food materials

2018 ◽  
Author(s):  
H. T. Sabarez ◽  
S. Keuhbauch ◽  
K. Knoerzer
Keyword(s):  
Energy Consumption ◽  
Low Temperature ◽  
Product Quality ◽  
Direct Contact ◽  
Lower Energy ◽  
Drying Time ◽  
Indirect Transmission ◽  
Ultrasound Assisted ◽  
Improved Design ◽  
Low Temperature Drying

An ultrasonic design based on the indirect transmission of ultrasonic energy from the ultrasound emitter through to the material to be dried was investigated to assist in low temperature drying of food materials. The application of the improved design tested in this work was found to enhance the low temperature drying by shortening the overall drying time of up to 45% (i.e., lower energy consumption and may enable better retention of product quality). This offers a promising approach towards a better applicability of ultrasound in industrial operation, since no direct contact between the sample and the ultrasonic emitter is needed. Keywords: ultrasound; drying; low temperature; drying intensification 

scholarly journals Coupling electro-dewatering and low-temperature air-drying for efficient dewatering of sludge

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hang Lv ◽  
Qiao Xiong ◽  
Daoguang Liu ◽  
Xu Wu
Keyword(s):  
Energy Consumption ◽  
Low Temperature ◽  
Physical Modeling ◽  
Lower Energy ◽  
Electric Field Intensity ◽  
Drying Process ◽  
Air Drying ◽  
Front End ◽  
Sludge Cake ◽  
Low Temperature Drying

AbstractThis study investigated the effects of electro-dewatering on subsequent low-temperature drying at various potentials and the characteristics of low-temperature air-drying sludge were explored through experiments and multi-physical modeling. Experimental results showed that the extracellular polymeric substance (EPS) content in the sludge was reduced during electro-dewatering process, even the species of organic matter was changed, as well as the dewatered cake tend to form many seepage channels, crack and a certain number of holes. These changes in the properties and structure were conducive to the subsequent low-temperature drying process. For air-drying process, the mass of the sludge cake variation was simulated and results were consistent with the experimental phenomenon. Firstly, the weight of the sludge cake was decreased approximately linearly with time, then tended to stable and reached the dewatering limitation finally. The applied higher electric field intensity (25 V cm−1) in the front-end electro-dewatering were conducive to promote water vapor diffusion activity in air-drying stage. Energy consumption and yield analysis results indicated that the combined technology has lower energy consumption and higher yield than that of directly low-temperature drying.

scholarly journals Research on low temperature drying characteristics of different types of manure and biogas residue

2020 ◽  
Vol 194 ◽  
pp. 02014
Author(s):  
Xiu Fangtao ◽  
Zhu Hongguang ◽  
Xu Yupeng
Keyword(s):  
Low Temperature ◽  
Waste Heat ◽  
Raw Materials ◽  
Characteristic Curve ◽  
Residual Water ◽  
Drying Time ◽  
Drying Characteristics ◽  
Drying Temperature ◽  
Low Temperature Drying ◽  
Biogas Residue

For the biogas project which does not have the ability to return to the field nearby, the outlet of biogas residue is one of the important bottlenecks restricting the development of biogas engineering. Deep dehydration and drying is a reliable basis for commercial utilization of biogas residue, especially combined with waste heat utilization of cogeneration of biogas. Therefore, three kinds of biogas residue raw materials were dried at low temperature by hot drying method in this paper. The drying temperature, the thickness of biogas residue and the backmixing amount of dry biogas residue were selected as three influencing factors. The drying time, drying rate and residual water ratio were taken as dependent variables. The drying characteristic curve of biogas residue was obtained, and the influence of each factor on the drying process of biogas residue was analyzed and compared. The results showed that the drying time of three kinds of biogas residue decreased with the increase of drying temperature. At the same temperature, the drying time decreases with the decrease of thickness. The dry biogas residue backmixing can’t optimize the drying characteristics and even increase the drying energy consumption.

ESTIMATION OF EFFICIENCY OF LOW TEMPERATURE DRYING ON THE BASIS OF ENERGY ANALYSIS OF PROCESSES IN ELEMENTS OF DRYING UNIT

2019 ◽  
Author(s):  
Ю.С. Беззаботов ◽  
Е.О. Ивченко
Keyword(s):  
Energy Consumption ◽  
Low Temperature ◽  
Energy Analysis ◽  
Specific Energy Consumption ◽  
Significant Proportion ◽  
Physical Models ◽  
Heat Regeneration ◽  
And Performance ◽  
Low Temperature Drying ◽  
Thermal Transformer

Рассмотрена работа двухконтурной установки низкотемпературной сушки (ДКУНТС) пищевых продуктов с применением компрессорного термотрансформатора теплового насоса. На основании физической модели ДКУНТС выполнен математический анализ энергетической эффективности процесса сушки. Получены аналитические зависимости удельных энергозатрат на сушку продуктов и режимные характеристики работы ДКУНТС. Установлено, что существенная доля энергозатрат в ДКУНТС связана со значительной тепловой нагрузкой на внешний электронагреватель НГЭ. В связи с этим предложено использовать тепловую энергию отработанного сушильного агента путем регенерации тепла в цикле работы установки, что позволит снизить энергозатраты на сушку пищевых продуктов в ДКУНТС. The work of a twocircuit installation of low temperature drying TCILTD of food products using a compressor thermal transformer a heat pump was considered. On the basis of physical models TCILTD made a mathematical simulation of processes and computer simulation of the analytical dependence of the specific energy consumption for drying and performance characteristics of the work TCILTD. It is established that a significant proportion of energy consumption is associated with a significant heat load on the external heater NGE, in which it is proposed to use the thermal energy of exhaust of the drying agent by means of heat regeneration in the cycle of TCILTD.

scholarly journals Ultrasound-Assisted Vacuum Drying of Wood: Effects on Drying Time and Product Quality

BioResources ◽  
2013 ◽  
Vol 8 (1) ◽  
Author(s):  
Zhengbin He ◽  
Yang Fei ◽  
Yiqing Peng ◽  
Songlin Yi
Keyword(s):  
Product Quality ◽  
Vacuum Drying ◽  
Drying Time ◽  
Ultrasound Assisted

scholarly journals The Effect of Drying Temperature on Nitrogen Loss and Pathogen Removal in Laying Hen Manure

2020 ◽  
Vol 12 (1) ◽  
pp. 403
Author(s):  
Xuanyang Li ◽  
Baoming Li ◽  
Qin Tong
Keyword(s):  
Low Temperature ◽  
Nitrogen Loss ◽  
Ambient Air ◽  
Laying Hen ◽  
Ammonia Emission ◽  
Drying Process ◽  
Drying Time ◽  
N Content ◽  
Drying Temperature ◽  
Low Temperature Drying

Exhaust air from the poultry houses or ambient hot air are normally utilized to dry the laying hen manure extensively in the summer in China. The drying process can not only reduce the moisture of lay hen manure but can also have a degerming effect. However, the ammonia emission is considered as one of the major issues of laying hen manure drying and air pollution scouse. Then, it is not clear that whether the ammonia emission increased using the hot ambient air to dry laying hen manure in summer and whether increasing the temperature can inactivate more bacteria during low temperature drying process. Therefore, the main works of this study were to investigate the evolution of ammonium nitrogen (NH4-N) content, organic nitrogen (Org-N) content, and total bacteria count vs. time during the low-temperature drying process of laying hen manure at different drying temperatures. The results showed that increasing drying temperature can reduce the energy consumption of the manure drying system, but can increase the loss of NH4-N. The Org-N content among the three drying temperatures within same drying time was not significantly different (p > 0.05), which suggested that increasing the temperature did not accelerate the degradation of Org-N during low-temperature drying process. Low-temperature drying had weak destruction of bacteria in laying hen manure and the end dried manure still had a great number of bacteria.

scholarly journals Analysis of the process of energy plants drying during the production of solid biofuels

2020 ◽  
pp. 110-125
Author(s):  
R. Shapar ◽  
◽  
O. Husarova ◽  
Keyword(s):  
Low Temperature ◽  
Total Duration ◽  
Raw Material ◽  
Residual Moisture ◽  
Drying Time ◽  
Solid Biofuels ◽  
Low Temperature Drying ◽  
The Impact ◽  
Kinetics Of ◽  
Energy Plants

The article presents an analysis of the stages of production of solid biofuels from energy plants and notes that the drying processes in technological processes consume up to 70 % of total energy consumption. The relevance and advantages of low-temperature drying are substantiated. Aim: intensification of the process of dehydration of energy plants, determination of rational parameters of the drying agent and dehydration conditions. Energy willow was used as an object of dehydration. Drying was carried out until the material reached a residual moisture content of 5...6 %. Studies on the effect of drying agent temperature on the kinetics of moisture exchange have shown that increasing the temperature from 80 °C to 100 °C enhances heat and mass transfer and reduces the process duration to 25 %. Increasing the specific load has a positive effect on the productivity of the drying plant and increases the amount of processed raw materials. The total duration of dehydration from the minimum load to the maximum increases by 3.5 times. The paper notes that a significant parameter of the impact on the kinetics of drying and increase the efficiency of the process is the method of grinding raw material. The most intensive mode corresponds to the method of grinding willow by combining abrasion and impact. With this method of grinding, the drying time is reduced from 15 % to 25 % compared to those considered. The established conditions and parameters of low-temperature drying provide intensification and efficiency of the process and obtaining dried energy willow with low and evenly distributed residual moisture.

scholarly journals Grape Dryer Using Infrared Radiation : An Experimental Study

2014 ◽  
Vol 8 ◽  
pp. 18-22 ◽  
Author(s):  
Joshi Snehal Santosh ◽  
Joshi Santosh Vishnu
Keyword(s):  
Experimental Study ◽  
Low Temperature ◽  
Product Quality ◽  
Experimental Analysis ◽  
Infrared Radiation ◽  
Drying Process ◽  
Drying Time ◽  
Floor Space ◽  
Natural Drying

Preserving fruits by drying is an important operation continued from prehistoric period. Infrared radiation can be used for grape drying purpose. It is unique process and distinctly different from conventional or natural drying. The infrared radiations accelerate drying process with a better control to achieve uniform drying, reduced drying time and ultimately improved product quality. Besides, it requires less floor space and compact system are the additional advantages. In this paper existing natural grape drying process is modified with suitable enclosure containing IR radiators and allied system. Appropriate sensors are used to measure parameters like humidity, temperature and weight of sample. Experimental analysis done with the help of dryer proves the uniform drying of the grapes with the help of infrared radiation. The original color of grapes is better conserved as the drying takes place at low temperature. The drying time is reduced to a significant level as compared to natural drying process.  DOI: http://dx.doi.org/10.3126/jfstn.v8i0.11722 J. Food Sci. Technol. Nepal, Vol. 8 (18-22), 2013

scholarly journals Intermittent–microwave and convective drying of parsley

2018 ◽  
Author(s):  
Justyna Szadzińska ◽  
Dominik Mierzwa
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Vitamin C ◽  
Product Quality ◽  
Color Change ◽  
Drying Kinetics ◽  
Convective Drying ◽  
Drying Rate ◽  
Drying Time ◽  
Microwave Application

The studies present convective drying of parsley with an intermittent microwave application. Eight different drying programs including convective drying (CV) were carried out in a laboratory-scale hybrid dryer. The influence of intermittent conditions on drying time, drying rate, energy efficiency and product quality was analysed. The results demonstrated that intermittent–microwave convective drying improves the drying kinetics and reduces energy consumption. Moreover, a higher retention of vitamin C, smaller color change and a better ability to rehydration were observed for the parsley samples dried using intermittent drying than for CV.Keywords: intermittent drying, microwaves, energy, vitamin C, rehydration.  

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