Numerical Simulation and Test Research of Pneumatic Drying on Biomass Fuel

2013 ◽  
Vol 274 ◽  
pp. 479-482
Author(s):  
Xin Hai Wang ◽  
Wei Lv ◽  
De Li Zhang ◽  
Xiao Nan Zhang ◽  
Zhong Xia Zhao
Keyword(s):  
High Speed ◽  
Gas Flow ◽  
Horizontal Tube ◽  
Initial Water Content ◽  
Single Factor ◽  
Drying Process ◽  
Test Bed ◽  
Initial Water ◽  
Hot Air ◽  
Pneumatic Drying

Based on the mechanism of mass and heat transfer of the particles and air in drying tube，the mathematics model of pneumatic drying process was established which referred to straw fuel in straight horizontal tube. The simulating results were summed up. Test bed of pneumatic drying was established，the test results were summed up by making single-factor test on the test bed. The results of simulating and single-factor test were coincided, and the pneumatic drying process was divided into two parts which were high-speed drying area and slow drying area. The effect factors were analyzed which were initial water content, hot air temperature, mass of hot air and materiel. The most important factor in gas flow drying on straw fuel was summed up which was the mass of hot air.

Numerical Simulation and Thermal Factorial Analysis of Pneumatic Drying on Straw Fuel

2012 ◽  
Vol 151 ◽  
pp. 341-345 ◽  
Author(s):  
Wei Lv ◽  
Hong Wei Sun ◽  
Xin Hai Wang ◽  
Yan Dong Li ◽  
Zhi Yue Yao ◽  
...  
Keyword(s):  
Gas Flow ◽  
Horizontal Tube ◽  
Orthogonal Experimental Design ◽  
Mathematics Model ◽  
Equivalent Diameter ◽  
Drying Process ◽  
Whole Process ◽  
Hot Air ◽  
Pneumatic Drying ◽  
Mass And Heat Transfer

Based on the mechanism of mass and heat transfer of the particles and air in drying tube, the mathematics model of pneumatic drying process was established which referred to straw fuel in straight horizontal tube, and the equations were solved by Runge-Kutta integration method. Then, by analyzing the thermal factors of gas flow drying，the most important factor in gas flow drying on straw fuel was summed up which was the mass of hot air. The method of orthogonal experimental design was used to analyze the whole process of gas flow drying, and primary and secondary roles led to the conclusion, which were the mass of hot air first , the equivalent diameter of the fuel granule and the temperature of hot air.

scholarly journals Numerical Analysis on Effect of Additional Gas Injection on Characteristics around Raceway in Melter Gasifier

2019 ◽  
Vol 38 (2019) ◽  
pp. 837-848
Author(s):  
Du Kaiping ◽  
Gao Xiangzhou ◽  
Sun Haibo
Keyword(s):  
High Speed ◽  
Gas Flow ◽  
Gas Injection ◽  
Coke Oven ◽  
Pure Oxygen ◽  
Small Scale ◽  
Gas Temperature ◽  
Fuel Gas ◽  
Hot Air ◽  
Flow Circulation

AbstractThe raceway plays an important role in the mass and heat transportation inside a melter gasifier. Considering that pure oxygen at room temperature instead of hot air is injected into the melter gasifier, a two-dimensional mathematical model at steady state is developed in the current work to describe the effect of the additional gas injection on the characteristics around the raceway in melter gasifier. The results show that a high-speed jet with a highest temperature above 3500 K could be found in front of tuyere. Furthermore, a small scale of gas flow circulation occurs in front of tuyere that results in a more serious thermal damage to tuyere. In order to decrease the gas temperature in the raceway to prevent the blowing-down caused by tuyere damage, the additional gas, including N2, natural gas (NG) and coke oven gas (COG) should be injected through the tuyere. Compared with N2, additional fuel gas injection gives full play to the high temperature reduction advantage of hydrogen. In addition, considering the insufficient hearth heat after injecting NG and the effective utilization of secondary resource, an appropriate amount of COG is recommended to be injected for optimizing blast system.

scholarly journals PHYSIOLOGICAL CHANGES IN WHEAT SEEDS DURING THE ARTIFICIAL DRYING PROCESS

2020 ◽  
Vol 28 ◽  
pp. 336-342
Author(s):  
Juliano Berghetti ◽  
Matheus Santin Padilha ◽  
Paulo Tarcísio Domatos de Borba ◽  
Cileide Maria Medeiros Coelho
Keyword(s):  
Initial Water Content ◽  
Physiological Changes ◽  
Drying Process ◽  
Critical Limit ◽  
Initial Water ◽  
Seedling Length ◽  
Moisture Percentage ◽  
Physiological Quality ◽  
Wheat Seeds

The desiccation tolerance presented by orthodox species is a characteristic that allows the loss of water keeping the seed viable. However, the reduction of the moisture content by drying, has a critical limit, and a loss beyond this limit results in a reduction in the physiological quality of the seeds, TBIO Sossego cultivar. The objective of this study was to evaluate the physiological changes resulting from the reduction of moisture percentage in the artificial drying process of wheat seeds. The seeds used were of the cultivar TBIO Sossego with initial water content of 14.7%. The seeds were dried at 40 ± 2 °C until reaching 12, 10 and 8% moisture. The evaluated variables were germination, seedling length, electrical conductivity, field emergence, shoot length and root length. Drying of wheat seeds can be performed up to 8% moisture without affecting the physiological quality of the seeds.

scholarly journals Influence of Organosilicon Additives on Strength of Sod Peat

2020 ◽  
Vol 174 ◽  
pp. 01008
Author(s):  
Vladimir Belyakov ◽  
Alexsandra Kuporova
Keyword(s):  
Energy Consumption ◽  
Water Content ◽  
Water Soluble ◽  
Production Performance ◽  
Initial Water Content ◽  
Drying Process ◽  
Initial Water ◽  
Hydrophobic Agent ◽  
Reduce Energy Consumption

The results of experiments to study the drying process of crumble peat with water-soluble organosilicon additives are presented. The analysis has found that a hydrophobic agent can be used to reduce the initial water content in moulding and, thus, to reduce energy consumption and improve the production performance. Subject to the optimal concentrations of additives, a significant increase in strength at the same drying intensity can be achieved which improves the quality of the finished product.

Influence of initial water content and strain rate on remolded yield stress in marine clay

2021 ◽  
pp. 1-8
Author(s):  
Xiaobing Li ◽  
Jianpeng Chen ◽  
Xiuqing Hu ◽  
Hongtao Fu ◽  
Jun Wang ◽  
...  
Keyword(s):  
Strain Rate ◽  
Water Content ◽  
Yield Stress ◽  
Initial Water Content ◽  
Marine Clay ◽  
Initial Water

scholarly journals Application of the Calorimetric Methods to the Characteristics of Seeds from Olives

Proceedings ◽  
2020 ◽  
Vol 70 (1) ◽  
pp. 90
Author(s):  
Andrzej Bryś ◽  
Joanna Bryś ◽  
Marko Obranović ◽  
Dubravka Škevin ◽  
Szymon Głowacki ◽  
...  
Keyword(s):  
Olive Oil ◽  
Water Content ◽  
Cooling System ◽  
Waste Product ◽  
Normal Pressure ◽  
Ash Content ◽  
Initial Water Content ◽  
Scanning Calorimetry ◽  
Initial Water

The olive oil industry represents an important productive sector in the Mediterranean basin countries. Olive stone is an essential by-product generated in the olive oil extraction industries and it represents roughly 10% by weight of the olive fruit. The seeds of pickled olives are also a significant waste product. In the present study, we have investigated the possibility of the use of differential scanning calorimetry for the thermal characterization of seeds from green and black pickled olives from Croatia. The differential scanning calorimeter (DSC) with a normal pressure cell equipped with a cooling system was used to determine the thermal properties of seeds from olives. The following analyses were also performed: the determination of calorific values in a pressure bomb calorimeter, the determination of initial water content, the determination of changes of water content during drying at the temperatures of 30 °C, 50 °C and 80 °C, the determination of a percentage content of seeds mass to the mass of the whole olives, and the determination of ash content. Seeds from olives are characterized by very good parameters as a biomass. The analyzed olive seeds were characterized by low water content, low ash content, and a relatively high caloric value.

scholarly journals Heat Transmission in High Speed Gas Flow (3rd Report)

1952 ◽  
Vol 18 (67) ◽  
pp. 31-35
Author(s):  
Kensuke KAWASHIMO ◽  
Shigebumi AOKI
Keyword(s):  
High Speed ◽  
Gas Flow ◽  
Heat Transmission

Pressure Assisted Sintering of an Aluminium Alloy

2009 ◽  
Vol 618-619 ◽  
pp. 627-630
Author(s):  
Stephen J. Bonner ◽  
Graham B. Schaffer ◽  
Ji Yong Yao
Keyword(s):  
Aluminium Alloy ◽  
Gas Flow ◽  
Isothermal Holding ◽  
Horizontal Tube ◽  
Elevated Pressure ◽  
Nitrogen Pressure ◽  
Gas Pressure ◽  
Densification Rate ◽  
Conventional Press ◽  
Gas Pressures

An aluminium alloy was sintered using a conventional press and sinter process, at various gas pressures, to observe the effect of sintering gas pressure on the densification rate. Compacts of aluminium alloy 2712 (Al-3.8Cu-1Mg-0.7Si-0.1Sn) were prepared from elemental powders and sintered in a horizontal tube furnace under nitrogen or argon at 590°C for up to 60 minutes, and air cooled. The gas flow was adjusted to achieve specific gas pressures in the furnace. It has been found that increasing the nitrogen pressure at the start of the isothermal holding stage to 160kPa increased the densification rate compared to standard atmospheric pressure sintering. Increasing the nitrogen pressure further, up to 600kPa, had no additional benefit. The densification rate was increased significantly by increasing the gas pressure to 600kPa during both heating and isothermal holding. Under argon the elevated pressure did not increase the densification rate. Results seem to suggest that the beneficial effect of the elevated pressure on the rate of densification is related to nitride formation.

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