Advances in Mechanics Engineering

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Authors: Chun Li Guo, Hui Wang, Xiao Long Qian, Tian Xu Zhou
Abstract: Numerical simulation of pipeline flow field was performed with CFD method and the factors of erosion thinning were analyzed. According to result of calculation, exact location of pipe thinning was predicted. The result shows that the prediction is in agreement with the actual instances, which provides reference for the inspection and maintenance of pipes along with the optimal design of pipeline system.
Authors: Xiao Peng Chi, Shou Feng Yang, Julian R.G. Evans, Guo Liang Lin
Abstract: A method for fabrication of mineral materials was studied. Micro extrusion freeforming of ceramics from high solid loading ceramic paste has advantages of low shrinkage stress, high sinter density, and environmental friendliness. Hydroxyapatite and alumina lattices were directly fabricated using 80 microns to 500 microns filaments. We report here on the implementation of design and fabrication of these scaffolds for photonic band gap materials. Influence of the solid contents of paste in the process of extrusion freeforming was studied.
Authors: Gao Fan Yue, Hai Long Tian, Tian Fu Xu, Fu Gang Wang
Abstract: Geological sequestration of CO2 in deep saline formations has been considered as an effective way to mitigate the greenhouse effect. With different rates of injection to a storage formation, the migration and storage mechanisms of CO2 are different. In this paper, we simulated the migration of CO2 based on a generic geological reservoir under simplified conditions. The results show that higher injection rate will lead to higher migration velocity and farther distance from the injection well, while it has no influence on dissolution amount when the total amounts of injected CO2 are equal.
Authors: Jin Na, Fu Gang Wang, Yan Shi, Zhi Min Cai
Abstract: In this paper we use Majiagou geologic formation in Erdos Carbon Caputure and Storage(CCS) demonstration project aera as artificial geothermal reservoir, and create numerical models of Enhanced Geothermal System(EGS) using CO2 as a heat transfer carrier. In order to analyze the impacts of CO2 injection temperatures on heat extraction rate and the sustainability of CO2-EGS, five cases with different CO2 injection temperature are designed. Simulation results show that the range of the average heat extraction rate of case 1~5 is 6.56~8.47MW in the whole CO2-EGS operation period. The heat extraction rates vary over time, And it is 6.37~7.9MW in CO2 and water displacement stage and 6.64~8.68MW after aqueous phase dispear respectively. Injection temperature of CO2 significantly impacts the heat extraction rate of EGS .
Authors: Dan Liu, Shu Ming Wen, Qin Bo Cao, Hai Ying Shen, Jiu Shuai Deng, Yong Jun Xian
Abstract: A technology of “depth cleaning- sulfuric and acid producing- residuals for ironmaking” is proposed for efficient utilization of sulphur concentration with high quality. The effect of the main factors involving grinding fineness, activators, collector type and dosage was investigated. On this regard, a close-circuit flotation test scheme was proceeded, by which a high quality sulphur concentrate was obtained with 52.39% of iron grade, 86.44% of iron recovery, 39.46% of sulphur grade and 91.52% of recovery sulphur. This concentrate can be directly used in the production of sulfuric acid and preparation of iron concentrate. This technology can be used to fully utilize sulphur and produce high quality concentrate as iron-bearing feed for steel industry, which will help to extend raw material sourcing for Chinese steel industry.
Authors: Yuan Hong Ding, Qing Wang, Hong Qiang Ren, Jian Lu
Abstract: The activities of nitrifying bacteria and organic utilizing bacteria against TCE in sludge was investigated using three series of Membrane bioreactors, and the results indicated that, the removal efficiencies of COD decreased gradually, but was not affected severely with TCE inhibition, good organics removal efficiencies was possibly realized, while the ammonia removal efficiencies dropped sharply due to the severe inhibition of TCE against nitrifying bacteria, the degree of TCE inhibition against nitrifying bacteria increased with the TCE concentration, but low-concentration TCE addition seems act as a chronic toxicity to the sludge activity, However, the nitrifying bacteria was gradually adapted to the TCE inhibition and its activities could be entirely resumed, and the ability of the nitrifying sludge to tolerate TCE could be satisfactory maintained either after the stop of TCE addition, therefore, TCE could be degradated partly by the nitrification processes, when the TCE was added intermittently and continuously into the Membrane reactors, simultaneously, a good performance of nitrification and organic utilization processes was possibly maintained stably.
Authors: Wen Hua Chen, Meng Li, Qi Song
Abstract: Dynamic shear characters of sands of Nanjing, Guangzhou, Harbin are studied, Some dynamic characters of schistose grain、shaft grain and round grain sand are compared and researched. The elastic-plastic change of structural sand skeleton under dynamic shear, the finally and irreversible deformation in the touched part of particle which maybe to produced elastic-plastic change deformation, the change of percent of mass different size particle, have been tested and he affection on dynamic shear from structures of schistose grain sand、staff grain and round grain sand and these affection to shear mould and extra-pore-pressure are analyzed. in order to simulate the nonlinear of dynamic volume and shear stress –shear strain during the liquefaction, a time-dimension-discrete model of sand diliatancy is suggested, the simplified equation can easy to explain the liquefaction and easily to analysis the dynamical deformations of soil.
Authors: Feng Qin Yu, Min Dong, Ya Li Yi
Abstract: This paper deals with photo electrochemical responses of titanium dioxide nanotubes on pure titanium. Photosensitive electrodes (anodes) with the major composition of doped oxides were made using the titanium oxide nanotubes. The responses of the oxide nanotubes with different additives to both ultraviolet (Uv) and visible (Vis) light were illustrated. Research results of the enhance absorption of visible light by adding transition metals or metallic oxides including Co, Ni, Cu, Zn, CoO, CuO, NiO, ZnO into the nanotubes will be shown. Finally, test results of the photo electrochemical fuel cells using diluted glycerol as the fuel under the irradiation of natural light will be presented and the open circuit voltage values will be given. The photo electrochemical test results show that the doped titanium oxide nanotubes show the n-type behavior. The photo anodes can absorb both ultraviolet and visible light. But the response to the ultraviolet light is five to ten times stronger.
Authors: Ze Sheng Cheng, Zhen Wang, Yu Liu, Na Na Bo
Abstract: Alkali lignin, Modification, Quaternary ammonium salt, Cr(Ⅵ), Anion adsorbent Abstract. LIA(lignin ionic adsorbent) was synthesized by modified alkali lignin after reaction with epichlorohydrin and dimethylamine or diethylamine by using the modifying agents of N-methylmorpholine (NMM) in the presence of organic medium of N,N-dimethylformamide(DMF). The LIA was characterized by FTIR spectroscopy and elements analysis, the yield of products and the adsorbent capabilities for Cr(Ⅵ) from aqueous solution were also exploited. The factors that might influent the adsorption performance were investigated, such as adsorption time, reagent dosage and the initial concentration of Cr(Ⅵ). It was found that the efficiency of Cr(Ⅵ) removal were better when the amount of the sorbent was increased. But the removal efficiency was reduced as the initial concentration of Cr(Ⅵ) increased. The contrast result of the two synthesis processes also proved the yields of sample 3 (modified alkali lignin using diethylamine) was higher than sample 2 (modified alkali lignin using dimethylamine). And the adsorption capabilities of sample 3 were also better than sample 2.

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