Mechanical Automation and Materials Engineering II

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Authors: Hai Yi Huang, Liu Dan Luo, Hua Zhang, Yan Qin Lu, Di Zhang
Abstract: Grapefruit Peel, which is the main waste from a southern fruit-Grapefruit in Guangxi, China. It has been used as a raw material for activated carbons by chemical activation with NaOH for the removal of Congo red (Direct Red 28) from aqueous solution in this study. The adsorption of CR by Grapefruit peel carbon (GPC) was carried out by many parameters such as pH, dye initial concentration, agitation time and temperature. It is favorable for the adsorption of Congo red in acid condition. The adsorption experimental results were analyzed by using the Langmuir and Freundlich isotherms models. Adsorption kinetic data were followed pseudo-second-order model.
Authors: Cheng Bi Fu, Tao Liu, Xiao Bai Li, Jing Zhu, Jing Jing Liang
Abstract: Effects of pressure of toluene, reaction temperature and nature of catalysts on coking over catalysts in toluene disproportionation are studied by using the method of thermogravimetry. Experiment results show that during the toluene disproportionation, the coking amount over catalysts increases with partial pressure of toluene and reaction temperature and the initial coking temperature decreases with partial pressure of toluene. Coking results mainly from the relatively stronger acid sites on the surface of the catalyst. Both HZSM-5 and HM catalysts have efficiency for toluene disproportionation, but HZM-5 catalyst has higher catalytic activity and stability.
Authors: Qing Chuan Xi, Ke Cao, Ya Wen Huang, Guan Jun Chang, Jun Xiao Yang
Abstract: Alkyl substituted disiloxanes demonstrated promising applications as high performance hydraulic oil, diffusion pump oil, etc. In this study, fluorinated alkyl substituted disiloxane was synthesized via Grignard reaction followed by condensation reaction. Its chemical structure was verified by FTIR and NMR. Measurement results showed that this silicon oil exhibited good high temperature performance, oxidation resistance and rust resistance.
Authors: Chun Ping Li
Abstract: Low-temperature SCR denitration in new style PC kiln was conducted using TiO2 catalyst. First, the theoretical quantity of ammonia consumption was calculated and applied in this experiment. Maintain the volume of exhaust gas flow and ammonia consumption quantity, concentration of NOx reduced from initial 503 mg/Nm3 of 120°C to 57.5 mg/Nm3 of 170 °C after catalytic reaction. When excess ammonia was injected into SCR reactor, efficiency of the denigration increased linearly too with temperature increasing and achieving the maximum of 89.45% under conditions of 170 °C, ammonia flow rate of 4.00 SL/min. After 20h continuous operating, efficiency of the denigration fluctuated ± 1% only. Pore of TiO2 catalyst have not blocked by exhaust smoke, that is to say: Low-temperature SCR TiO2 catalyst can be long-term used in new style PC kiln.
Authors: Li Wei Xie, Ze Long Xu, Yan Hua Huang, Shuang Cao, Zong Qiang Zhu, Yi Nian Zhu
Abstract: Adsorption of ammonia nitrogen from aqueous solution onto the bagasse adsorbent has been investigated to evaluate the effects of Adsorbent dose, initial NH4+-N concentration, and pH on the removal systematically. With increasing initial concentration, the amount of ammonia nitrogen sorbed onto the adsorbent increased until it gradually decreased due to the initial concentration exceed 50 mg·L-1, and the maximum adsorption capacity was observed for the sample to be 1.31 mg·g-1 at the initial concentration of 30 mg·L-1, and the corresponding removal rates decreased from 94.01 to 3.89%, with increase in initial concentration from 5 to 100 mg·L-1. Adsorption capacities decreased from 6.04 to 0.49 mg·g-1 with increasing adsorbent dose from 0.1 to 1.5g. What’s more, under alkaline condition, the removal efficiency of ammonia nitrogen from aqueous solution onto the samples were superior to that under acidity and neutrality condition.
Authors: Wen Bin Qi, Chun Yan Tian, Xiao Xin Feng
Abstract: Local materials was used as raw materials in the test. Test methods are standard test methods. It compared the use of fly ash alone or lithium hydroxide used alone inhibited the effect of alkali-silica reaction, and to a certain percentage of fly ash and lithium hydroxide complex joint effect of inhibiting alkali-silica reaction in the test. The results showed that compound admixtures overcome the shortcomings of the use of fly ash alone or lithium hydroxide inhibition of alkali-silica reaction. It can achieve the goal of complementary advantages.
Authors: Kuo Wei Chen
Abstract: Disposal of such high-Oil content (up to 8%-23%) waste (Carbon ash) troubles the Waste tire resource plant. The Fluidized bed Gasifier medium (SiO2 in Common) possesses the strong ability of heat reservation that makes the high-oil content waste pre-drying. In addition, the utilization of absorbed-Molecular sieves can get rid of generated. It is applicable to direct gasification pyrolysis of Carbon ash, Due to its collective characteristics of pre-drying, pyrolysis and clean of pollutant. This research was devoted to study the feasibility for self-sustained combustion of high-oil content ZKHN Waste tire pyrolysis waste by Scrolling-Type Fluidized bed Gasifier. Research results indicate that the suitable for operating temperature is about 370°C with about 150 pa Pressure difference and 82.9% burning efficiency for self-sustained gasification of carbon ash. In other words, the oil content must be controlled below 26%. The volatile gases and organic solvents of participates can be neglected. The emission of CO was an Important issue, but can be suppressed by best regulation some factors that are operating temperature, axial temperature distribution, primary air & excess air. These factors influence the results of this study.
Authors: Son Tung Pham, William Prince
Abstract: The objective of this work was to examine the influence of accelerated carbonation on the microstructural and macroscopic properties of thermally damage cement mortar. A normalised CEM II mortar was treated at 500°C then submitted to carbonation at 20°C, 65% relative humidity and 20% of CO2 concentration. The pores size distributions were determined from nitrogen adsorption. We also followed changes in electrical resistivity and ultrasonic velocity. The results showed that losses of macroscopic properties caused by cracks appeared at high temperature were restored due to carbonation. This highlighted the self-healing effect by accelerated carbonation which allowed the thermally damaged mortar to recover its initial properties.
Authors: Son Tung Pham, William Prince
Abstract: The objective of this study was to examine the natural carbonation that occurs during the cooling of thermally damaged cement mortar. Thermogravimetric analysis was used to follow mineralogical changes of CEM II mortar which was treated at different temperatures from 105 to 500°C. The results showed that, during the cooling to ambient temperature, by capturing CO2 from atmosphere the cement mortar tends to gain calcium carbonate from the loss of portlandite which was caused by heat treatment. This natural carbonation process allows the thermally damaged mortar to autonomously generate self-healing effect so that it can regain the initial properties.

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