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Evolution of Cement Minerals and Numerical Simulation of the Progress of Compound Coal Powders Combu

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Tutor: WangLiJiu
School: Dalian University of Technology
Course: Building Materials
Keywords: the joint technology,compound coal powders,evolution of cement minerals,numerica
CLC: TK227
Type: Master's thesis
Year:  2005
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Abstract:
China is one of a few countries that coal dominants energy and also the biggest country that coal is consumed in the world. In the current, China’s development patterns that electric power industry that almost burns coal and cement industry that coal is used as the important fuel are determined by the energy constitution that coal dominants energy. Professor Wang Lijiu begins to research on the technology of joint production of coal-burning electricity generation and cement manufacture. The technology is brought forward on the basement that China’s basic situations, comprehensive utilization of fly ash in coal-fired power plants and from the angles of optimizing resource utilization, cleaning coal technology and environmental protection. In the paper, based on the study compound coal powder burned remains’ hydraulic quality, work conditions in pulverized coal fired boilers are studied particularly, and the feasibility that products cement in boilers is verified. The paper’ specific research contents include some aspects as following.1) Based on the researches that relative scholars in china and oversea have made and combined prior work about the aspects that we have achieved, the feasibility of the joint production technology is verified through raw material replacing ,cement calcinations process -. compound calorific effect and a series of experiments. What’s more, the system of the technology of optimizing resource utilization, environmental protection and development prospect are represented.2) Based on raw material analysis, compound coal powder is developed through the method of cement rate quantity. Coal of industrial analysis that coal powders of different compounding rate is made, the chemical constitution of coal powders burned remains are tested, cement mineral system in the remains is analyzed qualitatively and compositions of the cement mineral is calculated.3) Combined the formation mechanics of fly ash in coal-fired plans, evolution characters of minerals in the progress of coals combustion is analyzed detailedly. Evolution of cement minerals system that compound coal powder in the progress of coals combustion in boilers is coupled according to the kinds of cement minerals in the remains.4) Numerical simulation in the all progress of coal combustion in boilers is established. Subsequently, the random movement model of compound coal powders particles, the heat exchange model and the model of compound coal powders combustion are studied specially.coal powders combustion and limestone decomposition in the process of coal powders combustion and high temperature heat transmission are coupled5) Based on that the process of heat engineering that gas phase turbulence, high temperature heat transmission, compound coal powders combustion and evolution of cement minerals in the pulverized coal fired boiler are made as the whole to study generally, temperature field in the boiler are made simulation study through the example of the pulverized coal fired boiler by the thermal analysis software of ANSYS. The analysis result is consistent with work condition of practical production in the boiler, we draw the conclusion that work condition in the boiler matches cement production.At the end of the paper expects the utility in actual production process of the technology of joint production of coal-burning electricity generation and cement manufacture. The joint technology is taken as the new development road that guarantees continuous development of electric power industry that almost burns coal and cement industry. The technology will exploit the active advantages in the aspects of optimizing resource and energy utilization and environmental protection. It is the new technology that products green cement of broad utility prospect.
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