Advanced Materials Research Vols. 347-353

Abstract: This study examines the primary planning research of Chinese wind power development. In recent year, wind power in China is developed rapidly which is dealing with many challenges and risks caused by limited primary energy resources and climate changes. Facing these challenges and risks, a better planning method of wind power is essentially. This research points out planning method of wind power consumption access to power grid. Based on wind power farm size and distribution, linked to power demand requirement of the future, research will put forward a better transmission power grid planning which adapted all kinds of wind power industry base.

Abstract: The magnetically doped TiO2 nanotube arrays were prepared in 0.25% (mass fraction) NH4F/glycerol including a certain amount of Fe3O4 nanoparticles using the method of anodic oxidation of a pure titanium sheet at a constant potential. The obtained nanotubes film were characterized by Field Emission Scanning Electron Microscope (FESEM), X-ray Diffraction (XRD), Transmission Electron Microscope (TEM) and Photoelectric Performance Test. Neat and orderly TiO2 nanotube arrays with Fe3O4 distuibuted evenly have been synthesized using the electrolyte doping method (add 0.1mol/L of the prepared Fe3O4 in the electrolyte). Photoelectric conversion efficiency of Fe3O4 doped TiO2 nanotubes is higer than that of pure TiO2 nanotubes.

Abstract: In the present paper the design and performance of a waste heat recovery steam generator with variable gas flux is investigated based on second law. A method to calculate temperature and mass flow rate for design is proposed. The effects of the operating parameters and the structure parameters on the average entropy generation number are analyzed. The results show: (i) the average entropy generation number (Ns) decreases with the increase of no-dimensional heat capacities ratio and no-dimensional saturation temperature difference ratio; (ii) compare with the fluctuation of mass flow, fluctuation of temperature has larger effect on the Ns.; (iii) A larger steam parameter is suggested in order to decrease the entropy generation based on reasonable temperature difference and it is appropriate for the number of transfer units of the evaporator and economizer to be 2.5~3.

Abstract: In the process of rapid urbanization building, the natural environment pollution threat to the health of residents; on the other hands, the limit living spaces constraints the residents physical activities. Environmental degradation is rooted in the city's extensive development, the powerless regulation of environmental and the weak awareness of environmental. Response to environmental degradation on health effects, we have three active intervention paths: promote the health of urban construction, building green, livable living environment, promote healthy lifestyles.

Abstract: Wind power, strong and smart grid (SSG), analysis model, coordinated development Abstract. Chinese wind power industry has been experiencing a booming development in recent years and will keep the strong momentum of development through 2020. Some key problems are facing China’s wind power industry, which requires the innovation in technology and management. Fortunately, China is constructing Strong and Smart Grid which addresses the development of renewables. In this scenario, after analyzing some major wind-power related bottlenecks in China, the paper gives an in-depth introduction to the Strong and Smart Grid strategy. Finally, the paper presents a novel model for studying the coordinated development of wind power and grid.

Abstract: In this paper, a thermal power system utilizing low-grade solar energy was proposed and analyzed. It can efficiently use the heat collected by the collector to provide electricity and also can provide some heat energy to satisfy the demand of heat. The system bases on the organic Rankine cycle. The evaporator employed in the system makes the organic working fluid turn to vapour phase at a high pressure level. Also a screw expander is employed in the system to conversion the heat energy to mechanical work. For the proposed system, a working condition was set and the performance of the system was calculated. When the temperature of the heat source is 95°C and the expander inlet pressure is 0.8MPa, the first law heat efficiency is 7.25% and the system exergetic efficiency is 10.14% for the system.

Abstract: The law of peak current, pulse width and working voltage parameter etc which influencing on wire-electro discharge machining (WEDM) cutting speed and surface roughness of the SiC particle reinforced Cu matrix composite in the WEDM machining were studied; the machined surface of Cu matrix composite was analyzed by means of scanning electron microscope (SEM); SiC Particle reinforced Cu matrix composite microstructure was analyzed by means of metallographic microscope. The results show that the first factors are peak current and pulse width, the second is working voltage. While pulse interval has reached a certain degree, pulse interval has slightly influence on surface roughness. If peak current is higher and pulse width is narrower, the wire electric discharging machining is ideal for matrix composite.

Abstract: This study analyzes the effects of technological progress for energy intensity and energy use related carbon dioxide emissions during urbanization in China by a dynamic computable general equilibrium model. The parameters about technological progress and urbanization are all exogenously given. The impacts of technological progress on economic growth, energy intensity and carbon dioxide emissions during period from 2002 to 2030 are examined. Simulation results show that gradually pushing energy efficiency related technologies through appropriate policy incentives is the key to realize low-carbonized development while promoting economic growth in China.

Abstract: Due to the inefficient utilization of solar energy in a solar tower power plant, this paper presents a new control method of closed loop tracking. With the current widely-used machine vision technology applied in the heliostats control, it is possible to obtain the deviation of heliostat position by image processing. According to the deviation, the controller adjusts heliostat position in order to achieve accurate tracking. The test result shows the effectiveness of the method.

Abstract: Through researches, erecting the method to predict gas outburst with the continuity of gas emission and determining the predicting indexes and the critical value can increase the continuity and reliability of predicting outbursts, realize the dynamic predication of the outburst in excavation face and avoid it take place, which is suitable for the need of the efficiency and safety mining.