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Niu H.,China Agricultural University | Liu L.,China Agricultural University | Zhao W.,Shandong Tianli Drying Equipment Co. | Liu X.,China Agricultural University
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2011

Although pulse combustion drying would exhibit high rate of mass transfer when used in a drying process, there is no numerical research about the mass transfer between materials and unsteady flow generated by pulse combustor. The results of an investigation of the moisture diffusivity in refractory clay and the convection process of moisture between refractory clay and outflow was reported. A Helmholtz type pulse combustion was used to generate an oscillating airflow. The moisture diffusivity in refractory clay was determined by the simplified method of drying methods. The mass transfer coefficient between refractory clay and outflow was evaluated by the results of experiment and Fick's second law with reasonable initial conditions and boundary conditions. The effect of airflow oscillating frequency on mass transfer coefficient was investigated and the correlation was established. Source


Yang F.,Shandong University | Zhou S.,Shandong University | Zhang C.,Shandong Tianli Drying Equipment Co.
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2015

A modeling and simulation method of free-surface flow fields in unbaffled stirred tanks was established based on the volume of fluid (VOF) multiphase model. The validity of this method was tested by studying the turbulent flow fields in the eccentric and unbaffled concentric stirred tank agitated by a Rushton impeller. The detached eddy simulation (DES) and the standard k-ε turbulence model were employed to simulate the mean fluid velocities, respectively. Good agreements were found between the numerical and experimental results, only with somewhat under-predictions. The difference between the DES and experimental data is less than 12%, while it is worse for the k-ε model. Results showed that the combination of the DES and VOF model, as well as the simulation method proposed here, can predict the free-surface hydrodynamics in stirred tanks with satisfactory accuracy. ©, 2015, Editorial Department of Journal of Sichuan University. All right reserved. Source


Patent
Shandong Tianli Drying Equipment Co. | Date: 2011-07-11

A pre-drying system for lignite, including an inner heating fluid bed dryer including at least one built-in heat exchanger, a feeding device, a second discharging valve, and at least one stage of dust collecting device. The built-in heat exchanger is connected to saturated vapor, and to a condensate system. A fluid bed of the inner heating fluid bed dryer is connected to superheated vapor. Exhaust vapor of the inner heating fluid bed dryer is processed by the dust collecting device, and then a part thereof returns to the fluid bed, and another part thereof is evacuated.


Geng W.-G.,Shandong Academy of Sciences | Gao L.,Shandong Tianli Drying Equipment Co. | Ma X.-X.,Shandong Tianli Drying Equipment Co. | Ma X.-L.,Shandong Tianli Drying Equipment Co. | And 2 more authors.
Applied Mechanics and Materials | Year: 2013

This paper presents experimental performance of a concentrator photovoltaic thermal (CPV/T) dryer for drying of honeysuckle flowers. The dryer consists of a perspex box structure. Heat for drying is provided by the excess heat of concentrator PV module and one fan powered by this concentrator PV ventilate the dryer. To investigate the experimental performances of the solar dryer for drying of honeysuckle flowers, 2 full scale experimental runs were conducted. Of which one experimental runs were conducted by hot air and the drying air temperature varied from 65° to 80°, the drying time was 5 hours. The other t experimental runs were conducted for natural sun drying for comparison, and the drying time was 5 hours too. Experiments were conducted for drying of honeysuckle in the month of June, 2012. Various half hourly experimental data namely moisture evaporated, honeysuckle surface temperatures, ambient air temperature and humidity, etc. were recorded to evaluate heat and mass transfer for the proposed system. The experimental results show that the quality of hot air dried products in terms of color, form, texture, etc. was high-quality dried products. © (2013) Trans Tech Publications, Switzerland. Source


Wu J.,Shandong University | Wu J.,Shandong Tianli Drying Equipment Co. | Li X.,Shandong Tianli Drying Equipment Co. | Wang H.,Shandong Tianli Drying Equipment Co. | And 2 more authors.
Asia-Pacific Journal of Chemical Engineering | Year: 2011

A unique experimental system for determining heat transfer coefficient and investigating heat transfer mechanism in a rotary tube dryer was designed, built, and tested. The drying chamber was made of stainless steel with a diameter of 500 mm and a series of thermocouples were fixed downstream the measuring pipes to determine the temperature of particles or moisture carrying gas. It was found that different position of a tube gives different heat transfer coefficient. The highest heat transfer coefficient appears at the position of about 90° of drum rotation. It is expected that increasing rotating speed can increase the relative velocity between the tube and the particles, and also the particles agitation speed inside the carrying gas. The integral heat transfer coefficient increases with the increase in material filling ratio until a certain value, about 20%. Source

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