Advanced Materials Research Vols. 608-609

Abstract: In this paper, the feasibility of employing Aspen Plus in the simulation of oil shale retorting would be discussed by modeling of a low temperature retorting process with fischer assay experimental condition. The samples of 4th layer of No.1 deposit and 11th layer of No.2 deposit of Huadian oil shale have been simulated, and draw a comparison between the simulation and determination results of oil content, moisture content, retorting gas yield, semi-coke yield and ultimate analysis. The tolerance between the simulation and determination results is within a reasonable range, which indicate that the process built and the physical method selected are correct and reasonable and would provide reference for building the process of oil shale comprehensive utilization system.

Abstract: Beta zeolite membrane was prepared on the surface of α-Al₂O₃ support tube with large pore by the way of secondary growth. Different seeding techniques, such as ultrasonic surge, self-assembling and dip-coating, were investigated, and the results indicated that the best one was dip-coating method for the support with large pore. The prepared membrane was characterized by SEM and XRD. It was proved that the beta zeolite membrane prepared by the way of secondary growth is continuous, dense and defect-free.

Abstract: Hydrogen is an important chemical commodity. Fluidized bed oxygen permeable membrane reactor is a novel technology for hydrogen production from natural gas reforming. An Aspen model is built for this novel reactor. Influences of reaction pressure, oxygen to carbon ratio, and steam to carbon ratio on the hydrogen concentration in syn-gas, hydrogen yield, and reaction temperature and methane conversion are studied. The results are compared with the ordinary fluidized bed reactor. It shows that the fluidized bed oxygen permeable membrane reactor has a higher methane conversion and a hydrogen yield and a higher hydrogen concentration in the syngas, due to its in-situ oxygen separation from air.

Abstract: Combining with five-point analytical velocity field, a new and practical CO2 miscible streamline model is developed for five-point pattern. At first, we develop one dimensionless model for CO2 miscible flooding along streamline axis; second, we deduce five-point pattern analytical velocity solution; third, we put driving model and analytical solution into allegiance. Finally, we validate our model through comparison with Eclipse and point out defects of the commercial software.

Abstract: Using SBA-15 molecular sieve as the support, Cu/SBA-15 and Cu-ZnO/SBA-15 catalysts were prepared by grinding and impregnation. They were characterized by XRD, TEM, TPR and nitrogen adsorption/desorption methods. Their catalytic activities of the dehydrogenation of methanol to methyl formate (MF) were studied and compared.The results indicated that the Cu and ZnO in the catalysts prepared by grinding had a worse dispersity than that prepared by impregnation. However, the reduction temperature of the CuO in the catalysts prepared by grinding was obviously lower than that prepared by impregnation and the selectivity to MF can be improved with the adding of ZnO. The experiments showed that the methanol conversion rate and selectivity to MF were 15.23% and 79.81% at 270°C for Cu-ZnO/SBA-15-G prepared by grinding, respectively. For Cu-ZnO/SBA-15-I prepared by impregnation, the methanol conversion rate and selectivity to MF were 13.41 % and 81.31% respectively.

Abstract: Risk assessment on coal and gas outburst was necessary to Coal mine safety management. The model of TOPSIS(Technique for Order Preference by Similarity to Ideal Solution), which is based on entropy weight, was constructed to evaluate outburst risk. The subjectivity which lies in ascertaining factors’ weights was avoided in this model. So the evaluation result is more objective than other evaluation methods. The model was applied in the safety assessment of coal and gas outburst for four mining faces from east area of Ping Dingshan mining area. The order preference of outburst risk was gained. At the same time, the risk differences among four faces were attained. The evaluation results indicate that TOPSIS method be more reasonable and objective. It is easier to use in Coal mines.

Abstract: Energy is the foundation of regional economy sustainable development. It is more and more serious of regional energy security problem with the rapid economic growth, industrialization and city development. The concepts of regional energy security and national energy security are analysed by comparison. On the basis, the connotation of regional energy security is defined. According to the characteristic of regional energy security problem, an evaluation model for regional energy security is performed by fuzzy integral. Then, the evaluation model is used on energy security problem of typical area in eastern regions and western regions. The experiment shows that the method not only evaluates the regional energy security, but also provides the reference for energy development strategy and policy making.

Abstract: With the large-scale use of power battery pack, its security issues are attracting more attention, especially insulation faults. Traditional insulation monitoring methods can only detect insulation faults appeared at the most positive and negative ends of the battery pack, which cannot meet the requirements of monitoring the insulation state of an entire battery pack system. This paper analyzed the multi-point grounding insulation model of power battery pack, and obtained an equivalent model. A method of detecting the insulation resistance and locating the insulation fault was given, based on the equivalent model. The results of the simulation on Multisim 10.0 and the experiment test proved the correctness of the simplifying process of the insulation model and the insulation monitoring method.

Abstract: In the process of power Energy Security evaluation, the load curtailment optimization is the crucial key step, which also supplements and perfects the static safe evaluation. In this paper, the LCO’s linear program algorithm is deduced on the basic mathematics model foundation, and programs in Visual Fortran environment. The IEEE bus-5 results in various states are presented to verify the load cutting optimization model.

Abstract: This paper analyzes the changes of geographic concentration of Korean oil imports as well as its interactive relationship with oil security and oil cost. We employ Herfindahl-Hirschman index to capture the changing geographic concentration of both crude oil imports and petroleum product imports. Using data ranging from 1970 to 2009, we document that the geographic concentration of oil is closely related to both energy security and energy cost. Geographical dispersion of oil imports may improve energy security but usually generates higher energy cost. We thus argue that there can be an optimum level of geographic concentration of energy imports. Both oil security and economic efficiency should be taken into consideration when making national energy strategies.