Advanced Materials Research Vols. 424-425

Abstract: Frequency inverter is more and more widely applied in Industrial and agricultural production due to its superior speed adjustment and energy-saving performance. Understanding on the frequency inverter actual common faults is more and more important. In this paper, firstly, the common fault type inverter are classified, and then the formation reasons are analyzed in detail, finally common fault processing measures are presented.

Abstract: The step face of the large-scale ladder impact drill is easy to generate fracture damage. The unreasonable working parameters are an important factor for the fracture damage in addition to the irrational structure. In this paper, three working parameters consisting of drill impact height, impact frequency and impact stratum for damage are studied from two perspectives of theoretical analysis and finite element analysis.

Abstract: Zero-sequence directional elements under a small voltage are studied and a new directional element based on zero-sequence reactance of fault components is presented. From analysis and simulations we have that when a forward fault or a reverse fault occurs, the zero-sequence reactance of a fault component will less or larger than the line zero-sequence reactance respectively. Therefore, the direction of a fault can be distinguished. The simulation results of EMTP show that the directional element based on zero-sequence reactance of fault components can identify forward and reverse faults accurately and it can satisfy requirements of relay protections for high-voltage lines.

Abstract: The second and the third end faces of the tube support plate of the large-diameter percussive drill are prone to fracture. The structure optimization of large-diameter percussive drill is carried out in this paper. The fully closed structure is turned into semi-closed structure. The reinforcing rib is arranged. With a drop test analysis, the optimized structure can effectively reduce the stress of the drill.

Abstract: Aiming at mechanical response of soft surrounding tunnel affected by high stress, the mechanical effect in the process of excavation and supporting of surrounding rockmass was analyzed by softening model. First of all, mechanics properties of soft surrounding rock and strain softening model have been discussed. Then, based on strain softening model, numerical analysis was carried out, and stress and displacement field, plastic range in the in the process of excavation and supporting was obtained. The result was very useful for the optimization of construction design and perfection for supporting program.

Abstract: The paper focuses on studying the diffusion control of local oil gas in high-risk places. The industrial suction hood is applied to the design of local oil gas diffusion control device. According to the jet principle, the optimize design scheme of the flow channel toward suction inlet is put forward. Under a given refueling condition, the diameter parameter value of cover mouth of suction hood is defined through Computational Fluid Dynamics (CFD) code CFX. Meanwhile, a qualitative discussion and quantitative analysis of the different effect of inhalation before and after optimizations are given in detail

Abstract: There are several factors which influence the combustion charateristics of coal-biomass compound brequet. In this study, the influence on coal-biomass briquets combustion characteristics of different factors were examined by orthogonal experiments, with volatile rate, burnout rate and combustion time as targets. The results showed that component of biomass and hearth temperature had significant influence, well variety of biomass and shaping pressure had slight influence to all targets. The results have theoretical worth to design and run boilers using coal-biomass compound briquets.

Abstract: Particle Swarm Optimization (PSO) algorithm is a technique for optimization based on iteration, which initializes system to product a series of random solutions, in this solution space, particles commit themselves to search for a better solution and in the final the optimal one is found. Applying this algorithm to the design of gravity dam section then we find: PSO, as shown by the example given in this paper, is an available algorithm which is not only tally with the actual situation, but safe and economical. So, PSO provides a new idea and method for optimization design of gravity dam section.

Abstract: School bathing wastewater treatment by contact oxidation as the reuse of reclaimed water. As lack of water During the holidays, the system can not function properly. When the students are back to school, a large number of bathing wastewater is generated in a very short period of time. Treated water can not meet the standards.and the Filtering equipments are easily contaminated. Now will be transformed regulation ponds for hydrolysis acidification-sbr-contact oxidation pool, add fenton reagent in primary contact oxidation ponds the entrance, plus PAC flocculant in sediment basins before flocculating sedimentation, improving aeration, water conditions.The system can start up in two weeks,And the water surface active agent can stability control in < 1.0 mg/L (in LAS plan).Reach national non-potable quality standards. Can be used for toilet flushing toilets back and urban greening.

Abstract: Inclusion as a research method was mainly applied in the study of mineral deposit geology in the beginning. In recent years, organic inclusion research has become one of the important means in hydrocarbon exploration. The study of the inclusion can determine the role of diagenesis and reservoir of time and temperature, infer hydrocarbon migration, tectonic movement and paleo-heat flow history, in order to better guide hydrocarbon exploration. This paper mainly discussed research method of hydrocarbon inclusions type and oil and gas inclusion, and summarizes the inclusion of the fracture structure used to study and hydrocarbon accumulation relations, determines the gas accumulation time, evaluate hydrocarbon, calculate fluid potential, predict oil and gas accumulation zones, and other aspects of the role. Inclusions found early, at first is mainly applied in the study of mineral deposit geology. Since Marray (1957) discovered larger hydrocarbon inclusions in quartz especially[1], in the 70 s, with the development of oil geochemical, the minerals fluid inclusions in the oil field geological research has been widely used. G. m. Gigashvili and v. p. Kalish in 1977 are the first to report the use of mineral inclusions as the hydrocarbons containing hydrocarbon migration of physical and chemical condition of fluid of the index. At the beginning of the 80's, the technology has already been foreign research institutions and oil company are widely used in reservoir the diagenesis of research and oil and gas exploration [2,3,4]. China has begun to set up in the 1960 s, the early main inclusions laboratory to research various metal hydrothermal ore deposits in the ore-forming temperature and the composition of the ore-forming fluid. ShiJiXi (1985,1987) will fluid inclusions method is used to study the carbonate formation of China and the thermal evolution degree, division of hydrocarbon generation evolutionary stages, according to package the body type, distribution, homogenization temperature, salinity, gas organic composition various inclusions observation and analysis data put forward the carbonate hydrocarbon source rocks and oil and gas reservoir has performance evaluation method and hydrocarbon index[2,5,6]. In petroleum exploration, through[[ First Author: Huiqing Liu (1980－), male, doctoral students, Major: mineralogy petrology mineralogy,E-mail:liu8935959@163.com]] the study of the sandstone reservoir formation of diagenetic minerals fluid inclusions, and combining with the chip observation to judge whether have oil and gas migration to reservoir, and oil and gas accumulation of time, ancient geothermal, formation water such as the salinity has a very important significance