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Mao G.,Nanjing University of Technology | Jiang J.,Nanjing University of Technology | Jiang J.,Jiangsu Key Laboratory of Urban and Industrial Safety | Dou Z.,Nanjing University of Technology | And 2 more authors.
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | Year: 2015

To study the natural oxidation tendency of sulfur corrosion products in oil tank, the sulfuration experiment equipment was built. Through the experiment of oxidizing reaction with O2 of simulated sulfur corrosion products in gasoline, diesel and high sulfur crude oil storage tanks, the law of the natural oxidation process was explored. The experimental results showed that the sulfur corrosion products in the gasoline tank were produced slowest for the longest cycle among these in the three tanks. When the oxygen volume fraction was between 7.8%-18.2%, the oxidation process of the sulfur corrosion products in high sulfur crude oil tank could be divided into three stages, which were primary oxidation stage, the secondary oxidation stage and the deep oxidation. When the oxygen volume fraction was below 13.2%, the oxidation of the sulfur corrosion products in diesel fuel tank only stayed in primary oxidation stage, while the oxidation risk of sulfur corrosion product in the gasoline tank was relatively small. The higher oxygen volume fraction, the greater combustion risk of sulfur corrosion products. © 2015, Editorial Office of Acta Petrolei Sinica. All right reserved. Source


Wei Z.,Nanjing University of Technology | Wei Z.,Jiangsu Key Laboratory of Urban and Industrial Safety | Jiapeng H.,Nanjing University of Technology | Jiapeng H.,Jiangsu Key Laboratory of Urban and Industrial Safety
2011 International Conference on Electric Technology and Civil Engineering, ICETCE 2011 - Proceedings | Year: 2011

In order to study the effect of common smoke control model, the numerical simulation combined with the full size experimental have been used to analyze effect of several modes, which composed with the smoke screen, mechanical smoke and air curtain, and the smoke temperature distribution, concentration distribution, and smoke down time between these model is compared. The results show that smoke preventing air curtain and pressurization in atria, with two smoke vents in aisle has the best mode of smoke control effect, which has exhaust efficiency about 74.52%. It not only can let smoke out timely, but also can guarantee safe evacuation environment in atria. © 2011 IEEE. Source


Xu D.-Y.,Nanjing University of Technology | Xu D.-Y.,Jiangsu Key Laboratory of Urban and Industrial Safety | Hua M.,Jiangsu Key Laboratory of Urban and Industrial Safety | Hua M.,Nanjing University of Science and Technology | And 3 more authors.
Procedia Engineering | Year: 2014

When the nozzle of release device directly faces the protected object, it is necessary for the superfine powder extinguishing agents (SPEA) to penetrate fire plume, so that SPEA can reach the fire source to extinguish fire effectively. Numerical simulation was used to make a comparative study on SPEA motion released at different driving pressures in fire. The simulation results indicate that the converging nozzle will enhance the capacity of extinguishing agent particles to penetrate fire plume, and its penetration capacity is directly proportional to the driving pressure value. When interacting with particles, the flame height decreases and flame width increases. The larger the driving pressure, the shorter time for particles to enter into fire source area. Particle concentration value in fire source area is relatively higher at 1.2MPa and it less changes at 1.0MPa. Larger driving pressure can accelerate the motion of particles to fill the extinguishing room. Eddies, which appear more easily at lower driving pressure, can also drive particles to fill the extinguishing room quickly, but with uneven distribution. © 2014 Published by Elsevier Ltd. Source


Hua M.,Nanjing University of Science and Technology | Hua M.,Nanjing University of Technology | Hua M.,Jiangsu Key Laboratory of Urban and Industrial Safety | Xu D.,Nanjing University of Technology | And 4 more authors.
Nanjing Li Gong Daxue Xuebao/Journal of Nanjing University of Science and Technology | Year: 2014

In order to research the interaction between superfine powder extinguishing agents (SPEA) and fire plume, the injection and movement characteristics of SPEA particles are numerically simulated in fire at different driving pressures. The interaction process of injection velocity model, discrete phase model, and fire model on the particles release, flow, and fire is numerically simulated. The simulation results indicate that the converging nozzle can enhance the capacity of extinguishing agent particles to penetrate fire plume, and its penetration capacity is directly proportional to the driving pressure value. When the fire interacts with the particles, the height decreases and the width increases. The larger the driving pressure becomes, the shorter the time for particles to enter into fire source area becomes. Particle concentration value in fire source area is relatively higher at 1.2 MPa and smaller at 1.0 MPa. Larger driving pressure can accelerate the motion time of particles to fill the extinguishing room. Eddies, which appear more easily at lower driving pressure, can also drive particles to fill the extinguishing room quickly, but with uneven distribution. Source


Guo W.,Nanjing University of Technology | Guo W.,Jiangsu Key Laboratory of Urban and Industrial Safety | Yue T.,Nanjing University of Technology | Yue T.,Jiangsu Key Laboratory of Urban and Industrial Safety | And 8 more authors.
Procedia Engineering | Year: 2012

Water curtain could dilute leaking poisonous gas or obstruct the diffusion of the poisonous gas to the sensitivity regions safely, efficiently and quickly. So it was very important to understand diffusion mechanism of the heavy gas diluted by water curtain and explore pattern of the effect of water curtain's setting parameter on the diffusion capacity of heavy gas diluted with water curtain. In this paper, experiments of fan water curtain and cone water curtain diluting CO2 in open space were done. According to experiment results, dilution mechanism of fan water curtain and cone water curtain were obtained. The protective screen formed by fan water curtain could obstruct heavy gas diffusion effectively, and fan water curtain could also disperse heavy gas upwards through the mechanical effect. Cone water curtain would atomize the water and mix the heavy gas and air intensively with the help of air entrainment to dilute the heavy gas clouds. On this basis, it was concluded that when water curtain was opened before heavy gas passed through water curtain and the cone water curtain was installed in front of the fan water curtain, dilution effect was better. When water curtain was opened after heavy gas passed through water curtain and the fan water curtain was installed in front of the cone water curtain, dilution effect was better. © 2012 The Authors. Published by Elsevier Ltd. Source

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