Advanced Materials Research Vols. 347-353

Abstract: In order to improve the cementitious activity of red mud, materials that can be easily depolymerized were added to it before co-calcination. Results from standard mechanical tests of mortars show that the cementitious activity of co-calcined red mud is significantly higher than that of the simple calcined red mud. For studying the mechanism responsible for this improved cementitious activity, analysis tools such as XRD, IR and NMR were used. XRD analysis reveals no obvious phase transitions during co-calcination. However, with IR and NMR analysis, it was found that the anti-symmetric Si-O absorption band broadened, while the NMR peaks of 29Si and 27Al not only became broader and more jagged, but also shifted in location. These results indicate a decrease in polymerization of the polyhedral Si-O in co-calcined red mud due to the process of co-calcination. Moreover, a significant increase in the dissolved quantities of SiO2 and Al2O3 in NaOH solution for co-calcined red mud is observed, which explains the increase in its cementitious activity.

Abstract: Using mixed flocculation and extraction method to recover the lanolin from Tannery Wastewater, and studied the process research. The result indicated that the recovery rate of lanolin can reached 92% by using aluminium sulfate (AS) and the polyacrylamide (PAM) mixed flocculation, hexane and cyclohexane mixed extraction. Comparing the main indexes and the infrared spectra of recycling lanolin with the industry level lanolin, the results indicated the main indexes of the recycling lanolin achieved the industry level standard, and both similar spectrogram showed the component and the structure of recycling lanolin are almost similar with industry level lanolin. Therefore the method used to deal with tannery wastewater recycling lanolin is practicable and effective.

Abstract: Coal is presently the largest source of electricity in China, with the increasing demand for electricity, the problems of environment pollution become more and more severe. In order to solve the problems, all options for power generation by new and renewable energies are enjoying growing attention in recent years. China has abundant solar energy resources and large wasteland areas, which makes China an ideal country for solar thermal power generation development. However, its present higher costs for China made it difficult to promote large-scale. Under this condition solar hybrid with coal thermal power generation becomes the best solution of the problem. In this paper, the feasibility of solar hybrid with coal thermal power generation in China was analyzed from the aspects of environment, policy, investment risk and economics.

Abstract: This paper analyzes the effects of clean and low-carbonized development of coal-fired power industry in China by a hybrid CGE model, which links the engineering sub-model with an energy CGE model and an energy balance sub-model. According to the calculation results, the current environmental protection target of coal-fired power industry of China should center on developing and spreading high-efficient denitrifization technology, mercury removal technology should be gradually combined with desulfurization and denitrifization technology in mid-long term, and carbon capture and storage technology should be introduced in long-term.

Abstract: As a late-model heating technique, radiant floor heating is much more energy-efficient as compared to the conventional air-conditioning system. For the sake of inner temperature distribution of the configuration, a steady three-dimensional model was performed based on the CFD software--CFX. On the basis of temperature distribution of the radiant floor, the total quantity of heat transferred can be calculated. It is observed that most heat quantity of heating water transferred to the concrete packing layer and the floor so as to heat the room.

Abstract: The nature of market transactions is the change of the main property rights, the core system of market economy is the property right. In 1960, Coase pulished “The Problem of Social Cost”,it inspired economists’ enthusiasm to property rights, and summarized the coase theorem. Clear property rights is the precondition of the market, and to define property by the government ofen has scale economy and violence advantage. Property rights include real rights and human rights, The real right is the derivation of human rights. Clear property is the real power to promote social and economic development, and the goals of social and economic development is development and improvement of the property.

Abstract: According to the principle of photovoltaic(PV) grid-connected generation, the maximum power point tracking (MPPT) and grid-connected control strategy were presented in this paper. Based on the V-I characteristic curve of photovoltaic array, it built the mathematic model of photovoltaic array and the MPPT algorithm. Through adopting the double-loop feedback control strategy, it achieved the unit power factor control. Lastly, with the example system, it implemented the simulations analysis including the sunlight changing and the temperature changing. The simulation results show that the proposed models and the control strategy are correct.

Abstract: A dominant torrefaction concept has emerged out of a large variety of biomass treatment technologies. The torrefaction product, mechanism, reactor technology and supplier of torrefaction reactor are described in this paper. It can’t get the conclusion that which torrefaction technology is better, because every reactor has itself characteristics. In the future, many commercial torrefaction plants will be built.

Abstract: Different condition of unbalanced current of three-phase four-wire low-voltage distribution system is analysed in this paper. The model of unbalanced reactive power compensation is built which is fit for the three-phase four-wire system ,Using phase-to-phase or phase-to-earth capacitance or inductance can transfer active power. Control the neutral current to be zero and three-phase current balanced by means of reactive power compensation. A compensating phase judgment approach is presented, the mathematic model of calculating phase current, phase compensating capacity line current and line-to-line compensating capacity is gave. Simulation result of physical system shows that the neutral current can be controlled to be zero and the phase current balanced. It substantiate that this compensation method is valid and optimize the operation condition of loads.

Abstract: Four groups of small-scaled ethanol pool fire experiment with different aspect-ratio(s) is undertaken, to gauge the mass loss rate of fuel as well as the plume centerline temperature distribution. Comparison of plume centerline temperature is made between the theoretical values estimated by Heskestad plume model and experimental results, which indicates that: with the increasing of s, the difference between theoretical values and experimental values tend to grow greater; and when s≈1, theoretical values and experimental values cohere well.