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Experimental Simulation and Fracture Characteristics Analysis of Rock under Uniaxial Compression Based on Discrete Element Method
Li Wei,Meng Fanhai,Ling Xin,Li Siqi,Chen Zihe
Abstract589)   HTML    PDF (1799KB)(270)      
The uniaxial compression test of deep rock in three Zhaohe area of Daqing is carried out by using the 20 ton single axis test machine. Based on laboratory experimental mechanics, rock physical parameters and contact parameters can be measured by uniaxial compression. Simulated rock samples with similar mechanical properties as laboratory experiments can be obtained by calibrating virtual parameters of discrete element software. Uniaxial compression experiments of rock samples were carried out by EDEM simulation, and stress⁃strain curves were obtained. Based on the stress⁃strain curves, the staged failure process of rock under uniaxial stress was obtained. The staged failure morphology, micro⁃fracture characteristics of force chain and the relationship between the number of bond bonds and time at different time were studied. The results show that brittle rock has no large deformation during uniaxial compression, the mode of force chain fracture is direct fracture, and no great deformation occurs. The cause of this damage may be the result of the occurrence and development of cracks in rocks.
2019, 32 (4): 33-38. DOI: 10.3969/j.issn.1006-396X.2019.04.006
Analysis of Water Content on Rheology and Wax Precipitation Characteristics
Zhang Yaxin,Li Si,Wang Weiqiang,Wang Guofu,Xiang Nan,Huang Yue
Abstract489)   HTML    PDF (3827KB)(218)      
Using waxy crude oil and pure water as the working material, several groups of W/O emulsions with different microscopic droplet distributions were prepared. With microscope and focused beam reflectance measurement instrument, the size and distribution of the dispersed droplets in emulsion were observed and measured. Furthermore, the effect of droplet distribution on the rheology and wax precipitation characteristics of emulsion was discussed. The results show that with the increase of water content, the apparent viscosity of W/O emulsion will be higher, the yield stress, gel point and wax appearance temperature will also increase, while the constant stress will show a gradually decreasing trendency. The phase transition point of Daqing waxy crude oil is about 60% water content.
2019, 32 (2): 71-76. DOI: 10.3969/j.issn.1006-396X.2019.02.012
Preparation of Nano SelfAssembly Macroporous Catalyst and Its  Hydrogenation Performance for FCC Diesel Oil
Li Siyang,Zhao Dezhi,Wang Dingcong,et al
Abstract445)      PDF (2618KB)(424)      
Adopting secondary nano selfassembly method to prepare macroporous catalyst(0106,1227)with small stacking density and high metal loading, the distribution of pore volume centralized from 30 nm to 100 nm,which accounts for 11%,28%. The first activity of two kinds of nano selfassembly catalyst(0106,1227) was investigated with Zhenhai FCC diesel oil as feed at reaction temperatures of 360 ℃,reaction pressure of 7 MPa,hydrogenoil volume ratio of 600,volume space velocity oh 1.5 h-1 in a fixed bed micro reactor of 10 mL,and with reference agent as a contrast. The experimental results show that the two kinds of nano selfassembly catalyst (0106,1227)has higher activity of hydrodesulfurization,hydrodenitrificationand aromatics saturation than the reference catalyst.The sulfur mass fraction of FCC diesel [KG*4]oil[KG*4] feedstock [KG*4]could [KG*4]be [KG*4]reduced from 12 400 μg/g to 483,283 μg/g which the highest desulfurization rate of 96.10% and 9771%;the nitrogen mass fraction of FCC diesel oil feedstock could be reduced from 1 507 μg/g to 35.7,14 μg/g which the highest denitrification rate of 9763% and 9900%; the highest aromatics saturation rate of 67.99% and 68.88%,while only to 537,64.6 μg/g and 9457%,95.54%,6565% over the reference catalyst.
2014, 27 (1): 11-16. DOI: 10.3969/j.issn.1006-396X.2014.01.003