Time filter

Source Type

Taiyuan, China

Li Z.,Taiyuan University of Technology | Li Z.,Sedin Engineering Co. | Huang W.,Taiyuan University of Technology | Shi L.,Taiyuan University of Technology | Zhang G.,Taiyuan University of Technology
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | Year: 2015

With aluminum isopropoxide as aluminum source, tetrabutyl titanate as titanium source, the NiMo slurry catalysts for ultra deep hydrodesulfurization of diesel were prepared by the complete liquid-phase technology. The prepared catalysts were characterized by XRD, TPD, N2 physisorption and XPS. The influences of the synthetic methods of precursor, including the sol-gel hydrolysis one step and sol-gel alcoholysis, hydrolysis two steps, respectively, with ethanol, isopropanol as solvent, on the catalytic 4, 6-DMDBT hydrodesulfurization performance of prepared NiMo catalysts were investigated. The catalytic performance of the NiMo catalyst prepared by sol-gel alcoholysis, hydrolysis two steps with ethanol as solvent, in which better dispersivity of metals, higher amount of acid and higher degree of vulcanization could be obtained, was more excellent in the removing of the sulfur from 4, 6-DMDBT than others. ©, 2015, Science Press. All right reserved. Source

Cui X.-X.,Taiyuan University of Technology | Fan H.,Sedin Engineering Co. | Zheng H.-Y.,Taiyuan University of Technology | Li Z.,Taiyuan University of Technology
Chinese Journal of Inorganic Chemistry | Year: 2012

In the preparation of a CuO/ZnO/Al 2O 3 catalyst for slurry methanol synthesis, microwave irradiation was introduced into the aging process. The effect of solvent polarity was studied on phase composition of the precursor, microstructure of the calcined CuO/ZnO/Al 2O 3 catalyst and catalytic performance for slurry methanol synthesis. The characterization by XRD, FTIR, DTG, HR-TEM, H 2-TPR and XPS showed that the solvent polarity had a significant effect on the composition of the precursor aged under microwave irradiation. The results indicated that solvent polarity benefited to the substitution of Cu 2+/Zn 2+ in Cu 2(CO 3)(OH) 2/Zn 5(CO 3) 2(OH) 6 by Zn 2+/Cu 2+. With the increasing of the solvent polarity, the content and crystallization degree of (Cu, Zn) 2(CO 3)(OH) 2 and (Cu, Zn) 5(CO 3) 2(OH) 6 became higher in the precursor, the interaction of CuO/ZnO/Al 2O 3 between CuO and ZnO became stronger, CuO crystal particles dispersed better and surface CuO content became higher. The performance of CuO/ZnO/Al 2O 3 catalyst using water as solvent is the best, the methanol sapce-time yield (STY) and deactivation rate of the catalyst were 320 mg · g -1 · h -1 and 0.11%· d -1, respectively. Source

Yang J.,Xian University of Architecture and Technology | Zhang T.,Sedin Engineering Co. | Peng Y.,Henan Electrical Power Survey And Design Institute
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2015

The joint stiffness is an important parameter in the design of steel tower structures. With the application of high strength steel in the substation frame structures, research on the flexural rigidity of the tubular joints that are made of high strength steel has become increasingly important. In this paper, an experiment study was conducted on three types of tubular joints which were enhanced by tile shaped plate, inner annular plate, and inner sleeve respectively, in order to get the influence of different reinforcement on the joint stiffness. By analyzing the different parameters of each enhanced method, the influence of various parameters on the joint stiffness was obtained. The stiffness performances of each joint were analyzed by the joint initial stiffness criterion specified in the European specification. The results show that the Q690 high strength steel enhanced tubular joints should not be taken as rigid joints in engineering design, but as semi-rigid joints. The action mechanism of tile shaped plate and inner annular plate on the tubular joint was explained at last. ©, 2015, Science Press. All right reserved. Source

Gao B.,Hebei University of Technology | Zhou J.,Hebei University of Technology | Zhou J.,Sedin Engineering Co. | Dong J.,Hebei University of Technology
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2013

With the aid of the magnetic measuring instrument FMP30, the deformation induced martensite contents(DIMC) of S30408 plate tensile specimen under different plastic deformation are measured to determine the relationship between the DIMC and the plastic strain. The DIMC of the dished head is measured for the inner vessel of a cryogenic liquid semi-trailer. The DIMC distribution along meridional direction is simplified to correlate with plastic strains in different region of the head due to process history. According to the bygone plastic strain, the stress-strain curve for every region of the head is determined for the ultimate bearing capacity analysis of the structure by nonlinear finite element method. Compared with the results obtained by the two other inelastic modes(considering the strain strengthening characteristics based on the true stress-strain relationship without bygone plastic strain in consideration; Elastic perfect plastic(EPP) mode without strain strengthening in consideration), it is found that, for the dished head made of S30408, the collapse load and the limit load with the strain strengthening characteristics in consideration are greater than that with the EPP model. The strain strengthening characteristics based on process history has little effect on the collapse load, but great effect on the limit load by bitangent method. It can significantly improve the limit load of the structure. © 2013 Journal of Mechanical Engineering. Source

Liu M.,China University of Petroleum - Beijing | Xie J.,China University of Petroleum - Beijing | Xie J.,Sedin Engineering Co. | Meng Z.,China University of Petroleum - Beijing | Lu C.,China University of Petroleum - Beijing
Journal of Chemical Engineering of Japan | Year: 2015

The particle mixer has a wide application in the chemical and petrochemical industries. In order to achieve adequate and homogeneous particle mixing, a new type of particle mixer was proposed by coupling a pre-mixing section and an internally circulating fluidized bed mixing section. The bed density and particle circulating velocity, as well as the cold and hot particle mixing degree in the mixer were investigated with an optical fiber probe and thermal particle tracer technology. Bed density in the internally circulating fluidized bed mixing section decreased with the increase of the superficial gas velocity in the draft tube, but changed slightly with the rise of the particle feeding mass flow rate. The radial evolution of the dimensionless bed density in the draft tube was approximative under different operating conditions. With the increase of the superficial gas velocity and particle feeding mass flow rate, both the particle circulating velocity and circulating mass flow rate increased, within 0.23 to 0.28 m/s, and between 90 kg/(m2 s) and 10 kg/(m2 s), respectively. The mixing performance was improved as the superficial gas velocity increased, while it changed only slightly with the rise of the particle feeding mass flow rate. The radial particle mixing was significant in the pre-mixing section where the mixing index could reach 0.7, and then in the draft tube where the mixing index could reach 0.95. © 2015 JTohuer nSoalc oieft Cy hoef mChiceaml Eicnagli Ennegerininege rosf, Japan. Source

Discover hidden collaborations