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Experimental Study and Analysis on Performance and Dedusting Efficiency of Frothing Generator

Journal of University of Science and Technology Beijing 2002年第1期9卷 5-8页

作者： ZhonganJiang CuifengDu 等 CivilandEnvironmentalEngineeringSchool UniversityofScienceandTechnologyBeijingBeijing100083China CivilandEnvironmentalEngineeringSchool UniversityofScienceandTechnologyBeijingBe

By simulating test and study in laboratory, the structure and performance offrothing generator were determined. The relative curves between the frothing volume and gas velocityof foaming net, supplying liquid volume and the content of foaming agent were obtainedrespectively. There were an optimum gas-velocity of foaming net, an optimum supplying liquid volumeand an optimum content of foaming agent under the condition of the given material quality and shapeof foaming net and spraying form. The spraying froth is of a great assistance in collectingrespirable dust.

关键词： frothing generator dedusting efficiency gas velocity frothing volume liquid volume.

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Delivery of inert gas through a vertical borehole using inert gas generator: A theoretical study

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International Journal of Mining Science and Technology 2020年第4期30卷 501-510页

作者： Rickard Hansen Sustainable Minerals Institute The University of QueenslandBrisbaneQueensland 4072Australia

The delivery of the inert gas through a vertical borehole using inert gas generator or IGG is *** limitations and/or transient effects are *** the analysis,the borehole diameter,borehole length,type of borehole and partial condensation prior to entering the borehole were varied.A choked flow will occur for a contraction exit or borehole of 0.3 m in diameter if no condensation prior to the contraction *** partial condensation takes place,a borehole diameter of 0.3 m will be possible if almost 50%of the water vapour ***,pressure losses along boreholes with a diameter of 0.3 or 0.4 m are significant and could pose a challenge if trying to mitigate the pressure *** a booster fan prior to the inlet of the 0.4 m lined borehole would still be a *** corresponding case with a 0.5 m borehole presents much more favourable pressure *** 0.5 m diameter lined borehole should be regarded as the lower *** rapid heating of the unlined borehole surface will increase the risk of thermal spallation and possibly imposing *** the mechanisms during gas delivery will increase the likelihood of a successful inertisation.

关键词： GAG Inert gas Condensation Pressure loss Choked flow gas velocity Borehole Heat transfer

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Spray Characteristics Study of Combined Trapezoid Spray Tray

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China Petroleum Processing & Petrochemical Technology 2014年第3期16卷 104-110页

作者： He Liang Li Chunli Liu Jidong Xie Zhenshan School of Chemical Engineering and Technology Hebei University of Technology

The spray behaviors of the combined trapezoid spray tray(CTST) have a significant effect on the gas-liquid interface. In this paper, the spray process of CTST in a column, 570 mm in diameter, was experimentally investigated by using a high-speed camera, and a theoretical model of the average droplet size was established according to the unstable wave theory. The results demonstrated that gas velocity passing through the hole is the key factor affecting the spray angle, which increases gradually with an increase in the gas velocity. When the gas velocity exceeds 7.5 m/s, the spray angle becomes stable at around 55°. The average flow velocity of the liquid sheet at the spray-hole increases significantly with an increase in the gas velocity, and decreases slightly with an increase in the liquid flow rate; moreover, it increases from the bottom of spray hole upward to the top. The density of liquid drops distribution in the spray area can be described by the RosinRammler function. In addition, the liquid drops are mainly concentrated in the area of spray angle ranging from 20° to 40°, and they gradually become uniform with the increase in the gas velocity and the liquid flow rate. The average liquid drop size deceases with an increase in the gas velocity, and increases slightly with an increasing liquid flow rate. In the normal working range, the average liquid drop size is about 1.0 mm to 2.5 mm in diameter.

关键词： CTST spray angle gas velocity distribution density average flow velocity of liquid sheet droplet size

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