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Gao P.,China Petroleum Planning and Engineering Institute
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2013

In order to study the mechanism of how pour-point-depressant (PPD) modifies the flow properties of waxy crude oils at low temperatures, the quantitative relation between the change induced by PPD beneficiation in the morphology and structure of wax crystals and the oil composition was discussed. A correlation was developed. The fractal dimension of wax crystals used to characterize the morphology and structure of wax crystals was dependent variable. The parameters of oil composition and the concentration of precipitated wax at the studied temperature were independent variables. According to the correlation, both the concentration of precipitated wax and the wax content have negative correlations with the increase of fractal dimension of wax crystals, but the content of resins and asphaltenes is beneficial to the increase of fractal dimension after the addition of PPD. Source


Yi S.,Wuhan University of Technology | Gao P.,China Petroleum Planning and Engineering Institute
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2013

The morphology and structure of paraffins existed in waxy crude oils is the most important factor influencing flow properties of waxy crude oils. The study on shear process quantitatively influences the morphology and structure of wax crystals is beneficial to the study on how shear process quantitatively influences the flow properties of crude oils. In this way, the correlations were developed, with the fractal dimension of wax crystals being dependent variable, both entropy generation due to viscous flow representing shear history effect, and the parameters of oil composition being independent variables. The correlations reveal that both the shear process at the temperatures which are below the wax appearance point, and the oil composition of waxy crudes can affect significantly the fractal dimensions of wax crystal contained in the waxy crudes. With the increase of concentration of precipitated wax and the content of waxes and the decrease of the content of resins, the morphology and structure of wax crystals can be destroyed more and more readily. Source


Ren H.,Petrochina | Liu D.,China Petroleum Planning and Engineering Institute | Wang J.,Southwest Petroleum University | Wang D.,Southwest Petroleum University
Advanced Materials Research | Year: 2013

Polyethylene pipes (PE), because of its corrosion resistance, welding, and long service life, PE pipes are used more and more widely in the gas industry. This topic is based on global warming, the phenomenon which leads to global warming, and studies the impact of temperature changes on the characteristics of polyethylene pipe. This paper uses thermal stress analysis function finite element software ANSYS, and selected PE80 SDR11 as calculating model, then establish thermal stress model to study Stress variation trend when inner wall temperature is 15° and outer wall temperature load varies. Thus, provides good suggestions and measures for the gas network operation and management. © (2013) Trans Tech Publications, Switzerland. Source


Zhao H.,Chinese Academy of Sciences | Zhao H.,University of Chinese Academy of Sciences | Zhu Y.,Chinese Academy of Sciences | Li M.,Tianjin Chengjian University | Yang H.,China Petroleum Planning and Engineering Institute
International Conference on Geoinformatics | Year: 2016

≥10°C Accumulated temperature, Solar radiation, Photosynthetically active radiation, and Light and temperature production potential of spring maize were calculated using 30 years the average daily observation data from 1981-2010, using 582 weather stations showing spring maize and basing on solar radiation equation and AEZ model. Spatial analysis was carried out on the site results in the ArcGIS platform, and finally, spring maize light temperature indexes contour maps and light temperature production potential classification figure were produced. Mapping results show that in spring maize planting areas, there is a positive correlation between light and temperature production potential and solar radiation (photosynthetically active radiation), and there are no completely positive correlations or entirely negative correlations. This study could provide support for Chinese spring maize production decision. © 2015 IEEE. Source


Ding X.,China University of Petroleum - East China | Liu F.,China Petroleum Planning and Engineering Institute | Yang C.,China University of Petroleum - East China
Advanced Materials Research | Year: 2012

The adsorption behavior of ethylene and propylene in zeolite ZSM-5 was studied by Grand Canonical Monte Carlo (GCMC) simulations. It is found that ethylene and propylene molecules show different adsorption behaviors in the zeolite cavum. The adsorption isotherms of ethylene and propylene in ZSM-5 at 298K and 823K were simulated. The results exhibit that the molecular adsorption is influenced at various temperatures and pressures leading to different rules for the adsorption of ethylene and propylene molecules in zeolite. At low temperature when the pressure is enhanced from 100kpa to 1000 kpa the adsorption amounts of olefin molecule increase obviously and the loading of ethylene are significantly larger than those of propylene. The adsorption of propylene has a preferential adsorption site in cross position and nearly reaches saturation at pressure higher than 300kPa. While at 823K the adsorption of ethylene is inhibited with lower loading than those of propylene. © (2012) Trans Tech Publications Switzerland. Source

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