Advanced Materials Research Vols. 1044-1045

Abstract: According to the industrial accident statistics reported by the Korea Occupational Safety and Health Agency, about 10 percent of accidental work site deaths were caused by defect or misuse of safety equipment [1]. For this reason, safety equipment should be understood properly to prepare a plan for its appropriate use [2]. Therefore, this study aims to identify the related problems by studying the understanding of safety equipment for construction works at sites. To conduct this study, a questionnaire survey of 100 construction workers in apartment building construction sites in Jeolla-do was carried out. This study reveals that the education on safety equipment is of help for construction workers, but they do not have a deep understanding of it in actual use.

Abstract: An investigation of radiant heat distribution on drying area in the chamber of infrared-rotary dryer (IRD) was conducted by measuring the values of infrared radiation on drum surface of the dryer chamber and then showed in term of surface temperature (ST). A gas-fired infrared burner (GIB) was used as the heat source, radiated the electromagnetic wave in the length of near-infrared ray. The drum surface was set as an infrared radiant absorbing area, installed with type K thermocouples and set as grid. Different levels of drum diameters (D=700, 900 and 1100 mm.), infrared peak wavelengths (IRP=3.32, 2.97 and 2.70 micron), distances between GIB and drum surface (H=300, 400 and 500 mm.), grid positions on drum surface (longitudinal direction (L) and radial direction (W) = 900 x 900 mm²) were applied. Then, distribution of surface temperature values was analyzed, based on response surface methodology (RSM) obtained from a second order polynomial model. The results showed that IR and H were the main factors affecting the radiant heat distribution. Then, the surface plots of ST levels on the absorbing drum surfaces in the rotary drying chamber were constructed. The contour plot results were indicative of a use for the design and selection of an appropriate size of area for drying with uniform distribution of IR in accordance with user-defined parameters.

Abstract: The author of this article had given a brief analysis of the water network characteristics and properties and surrounding environment and sediment profiles of Tarim River, then based on these analyzes, had given the extrapolation and analysis of the mechanism of becoming of the cohesive sediment of Tarim River. And then the author of this article had taken the screening tests and chemical composition for the cohesive sediment sampling from the lower reaches of Tarim River, and based on these results, the author of this article had given the in-depth analysis of the characteristics of the cohesive sediment of Tarim River, further, and had laid a soild foundation for further study of the movement of viscous flow of cohesive sediment of Tarim River.

Abstract: Yazidang Reservoir is a pumped-storage reservoir for water supply in Ningdong Chemical Industry Base of Ningxia, China. It plays an important role as a source of drinking and industrial water supply. Analysis of the water quality from March 2013 to May 2014, the results show that: For organic descriptors, value of COD_Cr, COD_Mn and DO can satisfy with class III, but some values of BOD₅ exceed the standard limitation. For index of nutrients, some values of TP exceed the standard, and TN greatly exceed the standard limitation. Using potential eutrophication to evaluate the reservoir water quality, the results show that Yazidang Reservoir is on a very high level of nitrogen and phosphorus nutrition, reach to level of eutrophy-extremely eutrophy. Considering the current situation of water quality in Yazidang Reservoir, some countermeasures should be carried out for pollution prevention and control of water quality, such as strengthening management, enhancing water quality monitoring and water quality evaluation, simulation, eutrophication control and estimation environmental capacity of reservoir.

Abstract: A new apparatus determining water activity using isopiestic method was developed. The water activities of the systems of LiCl−H₂O, NaCl−H₂O and KCl−H₂O at 298.15 K were measured using isopiestic method. Compared with the literature, the results of measurement are in good agreement with the literature, and the apparatus reliability was verified.

Abstract: Abstract: In view of the situation of domestic iron and steel enterprises to energy-saving, consumption reduction, reducing emissions, to improve the environment and the development of circular economy, the gas of the top tank pressure relief from six blast furnaces in Baotou Group is recycled in the project which has been used in blast furnace of developed countries for more than twenty years. Although China is a big country of iron and steel, it has always belonged to the rough type development, and there has been no precedent application. This design solved the long-standing top charging even pressure diffused pollution of the atmosphere and the noise pollution to the surrounding environment, in addition to recovery the gas recycling.

Abstract: Biogas is a mixture of gases which commonly consists of methane (up to 50%) and other inhibitor gases which are dominated by carbon dioxide (up to 50%). Biogas is produced naturally by the decomposition of organic materials such as vegetation or animal manure in the absence of oxygen and it also contributes less greenhouse gases which may lead to global warming or climate change. The presence of carbon dioxide (CO₂) in biogas is presumed to have some effects on biogas flame propagation characteristics. This study focuses on the effect of carbon dioxide (CO₂) as the biggest inhibitor composition in biogas on flame propagation speed as the important flame propagation characteristic in spark ignited premix combustion. Propagating flames are employed to measure the flame propagation speed as a function of the mixture composition. This parameter was measured using a transparent tube fuel chamber with dimensions of 60 mm inner diameter and 300 mm height based on DIN 51649 standards and recorded by high speed digital photographic technique. The characteristic of biogas-oxygen flames were studied at stoichiometric, room temperature and atmospheric condition from 0% to 50% CO₂ biogas inhibitor composition increased by 10% for each experiment. The results showed that the carbon dioxide decreases flame propagation speed of biogas. These indicated that carbon dioxide reduced reaction rate of biogas premixed combustion.

Abstract: Taking the initial design value for target power plant as standard index values, two comprehensive benefit index systems for flue gas desulphurization (FGD) technology were formed by mean square difference method with or without the index of earning of by-product, to analyze the environmental benefit, economic benefit, technology benefit and comprehensive benefit of six flue gas desulphurization technologies on designed power plant and obtained the optimal technology ultimately. For the index system with index of earning of by-product, the optimal FGD technology is wet ammonia desulphurization, not only possesses the biggest comprehensive benefit, but also the biggest economical and technology benefit for designed power plant. For the index system without the index of earning of by-product, the wet ammonia desulphurization, limestone wet desulfurization and simple wet desulfurization have similar comprehensive benefits, but individual advantage on environmental, economic and technology benefit separately.

Abstract: A KCl-doped CaO solid alkali catalyst was obtained in a wet impregnation method and treated under microwave irradiation to obtain enhanced stability and activity. Then the catalyst was successfully used in the transesterification of refined waste cooking oil with methanol to produce biodiesel. A uniform design experimentation U7 (7⁴) and regression analysis by DPS software were used to obtain the optimum conditions of transesterification at the lowest cost. Temperature 338K, catalyst amount 4.5% (wt./wt.oil) and methanol/oil molar ratio 9:1, after 90 min reaction, the fatty acid methyl esters yield reached 91.28% and the purity was over 99%, which was up to the national standard for B-100 biodiesel.

Abstract: This paper presents a method based on Pearson correlation coefficient to calculate the power consumption of main transformer cooler aiming at the problem of inadequate historical data and low data precision. From the perspective of probability, the method take the temperature data of main transformer and the environment as the intermediate variable, and establish the relationship between operation mode of generator and operation group number of main transformer cooler and the running time of the corresponding, thus estimate the power consumption of main transformer cooling system. Through the practical example shows, the method can be conveniently used for the calculation of power consumption of main transformer cooling system.