Advanced Materials Research Vols. 1092-1093

Abstract: The gas composition of boiler bottom room above the water-seal is very important to the steady operation of utility boilers in thermal power plant. As the water seal keeps air from entering the bottom room of the boiler, the gas there is comparatively enclosed. Coal particles fall down into the water from main burning area with high temperature. There is the possibility that carbon at high temperature react with water to produce combustible gases such as CO. When large quantities of slag fall down from the furnace into the water seal, the furnace pressure fluctuates widely and sharply, which leads to the flame out of the boiler quite often. The understanding of gas composition of the bottom room above water seal would help to find the reason of the pressure fluctuation. On the other hand, the gas composition above the water seal is the basic information that is deeded to research the whole burning process of coal particles and to maintain the steady operation state of boilers. Measurements were made to reveal the gas composition above the water seal. Temperature of gas just above the water seal was also measured. According to the measurement, CO concentration of high than 1000ppm was detected and the gas composition under normal state was analyzed.

Abstract: The aim of this paper is to evaluate the performance of thermo-chemistry tabulation approaches for numerical simulation of laminar partially premixed flame by comparing with the results of detail chemistry. Two thermo-chemistry tabulation approaches are considered: the multidimensional flamelet manifolds (MFM) method and Flame Prolongation of Intrinsic low-dimensional manifold (FPI) method. The fuel streams with different equivalence ratios (Φ_F=1.8,Φ_F=2.464) are analyzed. In both of the equivalence ratios the results obtained from MFM method are in closer agreement with the direct calculation than FPI method. It is concluded that multi-dimensional flamelet manifolds can capture more precisely partially premixed characteristic of the multi-regime flame structure, comparing to single-dimensional flamelet model FPI.

Abstract: A three-dimensional steady-state laminar flow and heat transfer model for fractal tree-like minichannel heat exchanger is developed.The fluid flow and heat transfer process is studied by CFD software. Because of its symmetric structure, only half body of the heat exchanger is calculated. The fluid-solid coupled method is applied and the hexahedral grid is used on the control volume.The temperature distribution and velocity distribution for different heat flux on top boundary surface are obtained with an inlet hydraulic diameter of 3.2mm.The simulated results show that the fractal tree-like minichannel heat exchanger has good temperature uniformity and small pressure drop.

Abstract: A mathematical model was established to predict heat and mass transfer in a flue gas desulfurization scrubber under stable operation condition. Thermal properties of liquid and gas phase were studied. The temperature calculation formula of liquid was presented which is in alignment with the operation parameters. The distribution of temperature and humidity of out flue gas is analyzed through MATLAB software. The results show that thermal properties of outlet flue gas are only related to temperature, humidity, and liquid-to-gas ratio of inlet flue gas. With the increase of temperature and humidity of inlet flue gas, those of out flue gas increase also; with the increase of liquid-to-gas ratio, those of out flue gas decrease. Under actual operation condition of plant power, outlet flue gas is nearly in adiabatic saturation state.

Abstract: Thermal protection materials are required to preserve the metal components of motor that suffer severe heat load. The research on thermal response of insulation of ramjet combustion chamber was carried out by the ground test and numerical simulation. During the working time of the ramjet, the back-face temperature of the thermal protection material was measured. The scanning electron microscope of samples was investigated. The calculation of thermo-chemical flow was solved by the CFD software FLUENT to provide the heat load boundary for simulation of heat transfer of EPDM insulation. The heat transfer model was solved by the FEA software ANSYS. Comparison of the temperature profile at the ablating surface between calculation and measurement shows the two results agree with each other. The simulation results can provide the temperature rising trend of insulation in a certain extent.

Abstract: In this paper, thermal model of the symmetric rectangular stackable supercapacitors are established. By using the finite element method, the temperature distribution of the supercapacitor is simulated. Then the supercapacitor's thermal behavior under the ambient temperature, but with different current density is analyzed. The simulation results show that the maximum temperature during the discharge process occurs in the center of the supercapacitor. The maximum temperature is associated with the applied current, and the higher the applied current is, the higher the maximum temperature is. It's necessary to control the maximum temperature within the allowable values, by establishing reasonable thermal management systems and cooling systems.

Abstract: This paper shows a multifunctional and real-time control system of environment and building. It includes wireless data acquisition terminal, wireless ad-hot network module, inspection device, data acquisition gateway, software of energy consumption analysis, system of infrared thermal imaging analysis.

Abstract: Through the three-dimensional heat transfers numerical simulation of eight kinds with the different number of holes, void ratio and arrangement of sintered shale porous brick (size: 240mm×190mm×90mm), which simulate the sintered porous brick under two different laying way that is 240mm wall and 190mm wall of equivalent thermal conductivity. The result shows: the same kind of porous brick as 240mm wall and 190mm wall, when the equivalent thermal conductivity coefficient has phased difference that the wall insulation effect is obviously different. Through the analysis of two different methods of the masonry wall thermal insulation performance of the influence by different reasons, targeted to put forward some suggestions in order to improve calorific performance of the wall.

Abstract: This paper mainly introduces the advantage of the building integrated photovoltaic technology, characteristics of the main solar materials. Through understanding the barrier and the advantages of solar materials existing in the architectural design, the role of solar energy materials can be played better in building. This paper also introduces the form of the concrete application of building integrated photovoltaic in different building sites, explains the design of building integrated photovoltaic not only take part in the technical level, more involved in architectural form and space.

Abstract: Beginning from an analysis of the green building evaluation and labeling projects reviewed, this paper has a comprehensive analysis on the low content of green design and obvious “absence” of architects in the majority of evaluation and labeling projects by use of the theories of green architecture and economics. The author holds that such “absence” is originated from the external economy and technical complexity of green buildings and attributes the causes to two aspects: First, there is no sound and effective incentive mechanism in the environment in which the architects are, especially the lack of professional identity and motivation of green design in architectural design appraisal, award and review criteria; Second, architects are less self-motivated, mentally backward and poor in comprehensive quality. Targeted measures are expected to advance the concept changes in the architectural education community, promote architects to transform thinking and enhance capacity and boost the “green” development of green buildings.