Applied Mechanics and Materials Vols. 229-231

Abstract: The gasification process of coal oil water (COW) slurry in new-type coal water slurry(CWS) gasification furnace was studied with numerical simulation method. The temperature and concentration fields were obtained for the gasification furnace. The simulated results showed that the gasification effect of the new-type coal water slurry gasification is better than the common coal water slurry gasification. In the new-type gasification furnace, the average temperature is slightly increased and the carbon translative ratio is increased by 1.81%. The effective component (CO+H₂) in coal gas at the outlet of the furnace is increased by 10.58%, and the concentration of CO₂ and H₂O is greatly decreased. The H₂O dissolution ratio is greatly increased and the gasification effect is obviously better that that of the common coal water slurry.

Abstract: Chloride ion migration and the choice of optimized current density during galvanostatic dechlorination of simulated cast iron artifacts in alkaline solution were studied by means of galvanostatic polarization. The results showed that the more treatment time and the more current density, the more was the extraction ratio of chloride ion and the less was the electrical efficiency. The current density was optimized with respect to the extraction ratio of chloride ion and the electrical efficiency, and the optional current density was presented.

Abstract: In this paper, three biocides with different mechanism were chosen to carry static test on screening from single formulation to complex formulation and bactericidal properties. The results showed that the most bactericidal biocide was isothiazolone, and the last was steady chlorine dioxide. The optimum concentration of three biocides in single formulation were isothiazolone10 mg/L, quarternary amine salt 20 mg/L and steady chlorine dioxide 20 mg/L separately. As the best complex formulation, P with optimum concentration of isothiazolone5 mg/L and steady chlorine dioxide10 mg/L, was verified as harmless for environment and also effective inhibition growth of microorganism by dynamic test.

Abstract: The paper defines replenishment time based on the leveled consumption controlled loop in production system. Then it proposes a method of Kanban calculation. Traditional production system dose not consider leveling principle, thus the replenishment time is not accurately and more likely to double or miss counting number of Kanban. In the paper, Replenishment time is specified into more parts to reflect all influence in production process, and leveling combined with consumption controlled loop is taken into consideration for the replenishment definition. A new defined replenishment time is a base of Kanban calculation. A method of Kanban calculation could be built. It could decrease the possibility of double or miss counting number of Kanban. A case study is given to prove feasibility of the method of Kanban calculation.

Abstract: In recent years, pump concrete construction technology is widely put in use because the modern architecture trends to over- height, large- span, and over-load. In the basis of the railway engineering examples, the thesis elaborates the ratio design of high-strength pump concrete, construction technology and quality control with reference to projects of the same kind.

Abstract: In order to reduce the conductivity of power-station’s circulating cooling water and reduce sewage discharge, this essay does research on using electro sorption technology to replace traditional water treatment technology. Through exploring the voltage and flow of the working module from experiment, it determined the optimum working conditions for electro sorption. The experiment includes the efficiency of reducing inlet water conductivity at different voltages, and the effect of flow rate to the treatment, proving that water conductivity will drop from 3,000 to 700 μS/cm on the condition of 1.7 V voltage and 500 L/h flow rate, which makes great sense to Electro sorption industrial applications.

Abstract: The detection of flaws is essential as the defects of pipes and containers affect the safe operation of many kinds of equipment. During the industrial production process, it is usually use the ray method to detect the flaws which has radiant effect on the testing personnel. The ultrasonic time-of-flight diffraction (TOFD) is a new type acoustic detection method and it is relatively safe for users. When using the TOFD technique, the selection of the probe separation is the important parameter which related to the effect of the test and the coverage range of the probe identifies the effective range of the detection. In this paper, the probe separation distance and the probe coverage range procedures which can help the testing personnel set the parameters quickly is devised. The experimental results indicate that this algorit

Abstract: Vibration can influence the imaging quality and tracking precision of the moving opto-electronic platform seriously, some measures of reducing vibration must be taken into consideration. In this paper the influence which vibration works on the imaging quality is analyzed, a novel design scheme of the damping mechanism is proposed, two new type Metal Rubber Isolators are designed, and two dimensional dynamic angle measuring instrument using linear CCD is applied to measure the dynamic rotational displacement of the opto-electronic platform. The result of vibration sweeping experiment shows that the isolator mechanism can reduce the three axis’ vibration higher than 25Hz. The angle-measurement result presents that the maximum rotational displacement is , which is suited to the demands of the imaging experiment.

Abstract: This study is focused on the effects of process parameters in plastic injection molding towards shrinkage and warpage problem of High Density Polyethylene (HDPE) specimen. The aim was to identify the main effects of different process parameters on warpage and shrinkage defects via numerical simulation software and experimental validation. Series of simulations were carried out using Cadmould 3D-F in order to utilize the combination of process parameters based on three level of L9 Taguchi orthogonal design. The Signal to Noise (S/N) ratio and the Analysis of Variance (ANOVA) were used to optimize the levels and to point out the impact of the process parameters on warpage and shrinkage. From the results, it showed that the most affected parameter on the warpage and shrinkage is packing time, with the P value of 48.93%, followed by melting temperature with 40.58%. The filling time and packing pressure were not a significant factor because they only contribute 7.30% and 3.19% of P value, respectively.

Abstract: In wet compression process water is injected at an inlet of compressor and continuous cooling occurs due to evaporation of water droplets during the compression process of air, which can save the compression work and enhance the performance of gas turbine system. In this work, performance analysis of the wet compression process is carried out under the critical conditions of water injection which are defined as the maximum water injection which can be evaporated completely inside the compressor. For various ambient conditions the important variables of wet compression process such as water injection ratio, temperature-averaged polytropic coefficient, compressor outlet temperature, and compression work are estimated under the critical injection conditions. Parametric studies show that compression work decreases with ambient temperature, however, the reduction ratio of compression work relative to dry increases with ambient temperature.