The Study About Heat Transfer Mathematical Model For Hot Blast Stove Of Bast Fumace

Hot stove is one of the most important equipments in the modern blast furnace ironmaking process, and its task is to supply hot air to the blatst fiirnce steadily. Building suitable hot stove can improve the effieciecy of heat transfer and the temperature of the entering gas and reduce coke ration, increase the yield of the blast furnace and decrease the cost of ironmaking, and produce huge economic benefits. Calculation of heat transfer in the regenerator of the hot stove is crucial to the design of the hot stove, which can be based on the heat transfer mathematical model of the regenerator, so the research of the heat transfer mathematical model has important signifinace.Analyzing the heat transfer characteristics of the hot sove, the heat transfer mathematical model of the regenerator is buildt, the research of this model is mainly to design the hot stove and verify the resluts .There are two models: the steady heat transfer mathematical model and the non-steady heat transfer mathematical model. The steady model includes the mathematical model of fuel combustion calculation and the mathematical model of design calculation, the models are mainly to slove the the problems of size of the hot stove, area and the radius of the regenerator etc; the non-steady model includes one-dimensional non-steady model in cylindrical coordinates and two-dimensional non-steady model in rectangular and cylindrical coordinates, checking whether the design of the hot stove is suitable by observing the distribution of the temperature, and adjusting the design parameters to meet the design requirements.On the basis of the mixed finite difference algorithm is used for the differential equation of the one-dimensional heat transfer mathematical model, adopting the TDMA algorithm to numerically solve the models to abtain a higher accuracy of the calculation than the solution methods of explicit difference or implicit difference; the interleaving implicit difference is used for the two-dimensional non-steady, adopting the TDMA algorithm to numerically solve the model, and overcome the defects of time and stability limits of the other solution methods.Comparatively analyzing applied examples in the literatures to verify the accuracy of the heat transfer mathematical model of the regenerator and the solution method. Material variety, fuel composition, gas flow rate in regenerator, physical properties of the lattice brick and so on given by the literatures are used as the inputting parameters to do the design calculation, and the size of the hot stove, area of heat storage are consist with the literatures;corresponding checking calculations are done to get the tempreture distribution condition of the lattice brick, smoke, hot air in regenerator of the hot stove, the results are consist with the literatures, so from the research results mentioned above, it is obvious to find that the models and the solution method are corrent.Therefore, the heat transfer mathematical models in the regenerator of the hot stove in this thesis can provide evidences for the design of the hot stove, and provide means for designing optimization of the hot stove.