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Research on the Simulation System of a Molten Salt Oven in Tube Digestion

Author: XuChuanHeng
Tutor: LiuYuChang
School: Central South University
Course: Thermal Power Engineering
Keywords: Molten Salt Furnace Technological Process ControlBuild Artificial Neural Networks System Simulation
CLC: TF806
Type: Master's thesis
Year: 2010
Downloads: 65
Quote: 0
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Abstract


Molten Salt Furnace System is the key equipment in the process of Alumina pipelining dissolution, but it was lack of systematic research and analysis on the thermal process of heating section and heat exchanging section in this system for a long time, so the operation and improvement of this system mainly relied on experience because of the lack of theoretical guidance. Therefore, it becomes an urgent new problems to build and solve the physical and mathematical simulation model of its every section, to deeply understand the thermal process of heating section and heat exchanging section in this system and to obtain the optimum structural parameters of its operation and every operating parameters based on actual production equipment.Pipelining dissolution Molten Salt Furnace System in Henan branch of Aluminum Corporation of China is used as the study object in this paper, ControlBuild is chosen as the platform and the test data of thermal balance are set as the boundary and initial conditions to simulate and optimize the thermal process of heating section and heat exchanging section in this pipelining system. Modular model is adopted in this paper. Based on numerous measured data, dynamic physical parameters formula is fitted by MATLAB. Meanwhile, the whole process simulation of this system is built by combining every sub-module with the equipments’ monitoring editing function of ControlBuild.The main work and conclusions of this paper are as follows:1) The Molten Salt Furnace System is systematically tested and studied, the material and energy balance of this system is analyzed in detail, the thermal test is also done in this paper. The founding shows that the ratio of excess air is too excessive to improve the performance of the Molten Salt Furnace System further;2) After the numerical simulation of molten salt heat exchanging section in this system by the FLUENT, the temperature distribution of the molten salt and pulp in the outlet of the pipe is obtained.3) ControlBuild is chosen to simulate the whole process in the light of its advantages of the whole process simulation. The physical and mathematical simulation model of the main components of this system, such as molten salt heating section, air preheater, is set based on the equation of material balance and energy balance. As the condition of molten salt heat exchanging section is affected by some factors, such as the temperature and flow of the molten salt and pulp, chemical reactions of pulp, which makes this model have the characteristics of complexity in reaction and multi-parameter, so ANN is chosen to build the model of heat exchanging section.4) Based on the mathematical model of every section in whole Molten Salt Furnace System, the collaboration platform of ControlBuild and Matlab is built by mixed programming and the process simulation of pipelining dissolution Molten Salt Furnace System is developed by the platform of ControlBuild.5)The ControlBuild simulated Molten Salt Furnace System is tested and verified by field test data and process system performance monitoring data. The results show that the simulation system can accurately simulate the operation process of the Molten Salt Furnace System and can not only meet the need of off-line technology training of operator very well but also be used for experimental study.6) The simulation optimization test is conducted by the system developed above, a more reasonable ratio of excess air is obtained and the law of heat exchanger’s efficiency influenced by the mutative ratio of leakage air of the air preheater is found. Simultaneously, it finds that the efficiency of the whole system can make better if the dissolution load of this pipelining system increase 40m3/h through studying on the relation of the pulp dissolution temperature and its quantity.7) The simulation system of ControlBuild and Matlab is utilized and ANN model is applied to predict the temperature of molten salt in heat exchanging section. It shows that energy saving can be achieved greatly if the temperature can be precisely controlled. The temperature of molten salt can be reduced 0.87℃per day, one of this system can save energy 31.7GJ in one cycle of scab cleaning. Therefore, It has important guiding significance and application value of this study for the improvement and promotion of the process of Alumina’s pipelining dissolution system.

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CLC: > Industrial Technology > Metallurgical Industry > Nonferrous metal smelting > General issues > Nonferrous metallurgy furnace
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