Advanced Materials Research Vols. 383-390

Abstract: Effects of additive on the desulphurization characteristics of wastes were studied by the high temperature tube reactor and the KZDL-4M sulfur analyzer. The results show that after Ba(OH)₂ and Fe₂O₃ is added into experimental wastes respectively, sulfur capture ability of experimental wastes increase effectively. MnCO₃ can only improve sulfur capture ability of experimental wastes a little or even little. Suitable additive is a useful way to improve sulfur capture ability of wastes. However, different additive affects sulfur capture ability of wastes differently, three kinds of additive can be sorted as Ba(OH)₂＞Fe₂O₃＞MnCO₃.

Abstract: Structure, cotton harvesting principal and main working parameters of rubber-bar roller harvester were studied in this paper. K value of rubber-bar roller speed ratio was determined based on displacement and velocity equations of rubber-bar end established by work pattern of the roller. The functional relationship between K value and harvest angle β of cotton plant by rubber-bar was derived. Additional, t Additional, the effects of K value on angle β and cotton harvesting performance were analyzed. The experimental results showed that collect rate of cotton was above 95% and percentage of impurities was less than 18% when working speed was 3 km•h^-1 and K value ranged between 6.8～8.3.

Abstract: Shenmu coals as low rank coal are difficult to prepare for Coal Water Slurry (CWS). The maximum slurry concentration of Shenmu CWS is lower than 60%, which is not available for practical application. Coal blending is a simple operation and low cost method to improve the slurry ability of low rank coal. Two different kinds of anthracite and bituminous coal samples were blended in Shenmu coal to study the effect on the preparation of CWS, respectively. The results showed that the maximum solid concentration of CWS increased as the proportion of high rank coal rise. And the viscosity of CWS is dropped at the same concentration. Different coals blending have different effects on the elevation of slurry ability for Shenmu coal. The raw coal with best slurry ability is not always the most suitable for blending in low rank coal. HuanNan bituminous coal is the best choice for blending in Shenmu coal. The maximum solid concentration of CWS can be increased by 6% when the proportion of HuanNan coal reached to 70%.

Abstract: Nitric oxide (NO) reduction through coal, biomass and their blend reburning is conducted on a drop tube furnace experimental system and it is proved to be feasible of using the coal-biomass blend as the reburning fuel. For a high NO reduction efficiency, the excess air ratio in the reburning zone should be less than 0.9 and the reaction temperature is required to be higher than 1373K. 50-60% of the biomass percentage in the blend is enough for an acceptable efficiency. At the same time, for a thorough NO reduction process, the reburning fuel fraction and the residence time in the reburning zone must be guaranteed about 20% and 0.6-0.8s, respectively. Also, when the initial NO concentration is excess 600ppm, the efficiency is varied little at different NO concentrations.

Abstract: With the rapid development of society, the demand for steel production is increasing, and the demand of the bar’s quality is getting higher and higher. However, what is constraining the production efficiency of the Bar industry is that the development of NDT of surface crack on the bar is unpleasant. This paper presents a new NDT method which is machine vision-based and fully automatic, and designs an application system which is more viable and practical. The bar non-destructive crack detection system use the Industrial Control Computer as Master Parts. Combine with the CCD image acquisition and the PLC control of the pipeline as a whole. This system utilizes Testing Technology of Fluorescent Magnetic particle, realize machine recognition through the Digital Image Processing Technology. What’s more, this system use the set method of adaptive threshold based on probability of detection and false alarm probability in machine recognition. It has a significant and Practical significance for reducing the computation of the system, improving the processing speed of this system, and meeting the needs of the entire system in real-time requirements.

Abstract: Biosorptions of Cr (VI) by the floc-type biosorbent AR (with glycocalyx) and AR (without glycocalyx) were compared. The initial pH was important for biosorption, and the optimum effect on Cr (VI) biosorption was acquired within initial pH 0.5-1.0. With the pH increasing, the effect on Cr(VI) biosorption was reduced, and when the initial pH exceeded 3.0, the effect on Cr (VI) biosorption was in an equilibrium of low levels. Biosorbing Cr (VI) of different concentrations, the maximal absorbing capacity of AR (with glycocalyx) and AR (without glycocalyx) was 187.36 mg•g^-1, 56.1 mg•g^-1 respectively, and the glycocalyx adhering on the cell improved the absorption obviously. The absorbed Cr (VI) could be recovered by desorption, and the desorption rate of AR (with glycocalyx) and AR (without glycocalyx) reached 67.9%and 62.3% separately. The two biosorption processes conformed Langmuir and Freundlich isotherm adsorption equations, so we could presume that the progress of biosorptions was reversible adsorption and irreversible adsorption simultaneously, however the reversible adsorption was more important in the biosorption and the adsorption belonged to physical adsorption. Besides Agrobacterium sp. fermentation broth could be used as bioflocculant, Agrobacterium sp. could be applied as biosorbent, and the glycocalyx improved the absorption obviously, then both the bioflocculant and biosorbent were promising biological products

Abstract: To solve the hard problem that the reduction of heat transfer efficiency on the cooling stave of blast furnace due to fouling deposition, solid particles have been added into the cooling water pipes, forming liquid-solid two-phase flow, which can change the heat transfer and anti-fouling capacities of the cooling water pipes. Under the different solid phase volume scores, the heat transfer and anti-fouling capacities of the liquid-solid two-phase flow in the cooling water pipes are studies. The results indicates that because of the perturbation and shearing effect of solid phase particles, not only can the heat transfer coefficient and heat transfer capacity of the cooling water pipes be enhanced, but also the anti-fouling capacity be increased. Thus the highly effective running time of the equipment is greatly extended, realizing the long-term highly effective running of the cooling staves. The blast furnace cooling stave as heat exchange equipment, its heat transfer effects has the very important influence to blast furnace's life. In order to enhance cools wall's cooling capacity, the domestic and foreign scholars around material quality [1], structure optimization [2-4], dirt cleaning of water pipe [5], heat-transfer property [1] of the cooling wall and so on to do the massive fruitful research work. At present, the fouling cleaning of blast furnace stave cooling water pipe wall is still a difficult problem. The high-pressure water washing and sand washing methods are commonly used in industrial practice, these are "doctors after the disease first" and low efficiency methods. The effect removing dirty stuff is not very ideal. The cleaning effect of on-line chemical cleaning is difficult to guarantee. Liquid-solid fluidization cleaning technology can be used in the blast furnace to cool the cooling water pipe wall. It can on-line clean fouling and strengthen heat transfer. Its anti-fouling performance has been studied experimentally.

Abstract: The temperature rise of generator components has a great impact on operation performance for large turbine generator. In this paper, applying the general FE calculation software-ANSYS, with a sequential electromagnetic-thermal field coupling calculation method, temperature calculation on phase lead connecting structures of 1100MW nuclear power turbine generator parallel rings is presented. The calculation results could offer a basic analysis to optimize the design of the generator.

Abstract: A novel hydro-mechanical deep drawing for magnesium alloy sheets at gradient temperature is proposed and studied. The novel process is on the basis of the study in sheet metal forming, the properties of magnesium alloy and the forming characteristics of workpiece in deep drawing. It indicates that the deep drawing operation of magnesium alloy sheet should be done in warm condition due to the poor plasticity of magnesium alloy. In addition, the reasonable temperature gradient of the workpiece is necessary in light on the principle of deep drawing. The essence why the limited drawing ratio can be improved with the new process is demonstrated. The reasonable temperature gradient can be obtained by the fluid pressure control during deep drawing operation. Thus the feasibility of the new technology is verified.

Abstract: Fe-B alloys with different boron contents were dipped into a pure molten zinc bath to investigate their anti-corrosion property. Scanning electron microscope (SEM) and energy dispersive spectrum(EDS) were used to detect the corrosion products. It is found that the corrosion mechanism of α phase is corrosion and dissolution ,while the Fe2B phase is crack mechanism because of its brittleness and excellent corrosion resistance.The Fe2B phase in eutectic structure can protect the matrix from molten zinc and restrict the reaction of Fe-Zn. With the increase of boron content, the corrosion resistance performance of the alloys improves gradually.