Study On Heat Transfer In The Wall Of Blast Furnace

In this paper, the temperature field in the wall of blast furnace has been studied by thermal test and numerical simulation. The influence of type and structure parameters of cooler, kind of lining refractory, operation factors on the temperature field in the wall of blast furnace was investigated. On the basis of numerical simulating results, the predicting model for blast furnace wall's temperature was established with the BP (back propagation) neural networks.The damage investigation on the blast furnace (with 1260m~3 inner volume) in Tangshan Iron and Steel Company was carried out. The results show that most of the flanged parts of the casting iron staves were damaged in the early stage of the campaign. Without supporting, the lining will collapse quickly. In this case, the staves will be working under the condition of no lining protection and they will be damaged very easily. This is the most important reason for the blast furnace equipped with flanged casting iron stave in lower shaft area only have shorter campaign life.In this paper, the heat test of the flanged stave, which is same as the actually used one, was successfully carried out. The influence of factors, such as furnace temperature, velocity and temperature of the cooling water, on the stave's temperature was investigated. The experimental results show that the effect of reducing the cooling water temperature and increasing the water velocity on decreasing the stave temperature is limited. It is unreasonable to do so in the practical blast furnace operation.According to the wall's structure of lower shaft of actually used blast furnace, with reasonable simplifying, the physical and mathematical model for the calculation of three-dimensions steady state temperature field of the blast furnace, which were cooled with stave-plate compound cooling system and stave cooling system, was established. The boundary conditions were discussed and determined. With the model and boundary conditions, the temperature field of the stave used in thermal test was calculated. The results is good agreed with that obtained by thermal test.By using the large-scale general finite element analytical program—ANSYS, the three-dimensional steady state temperature distribution in the blast furnace shaft wall (cooled with flanged casting iron stave and stave-plate compound cooling system respectively) was numerically simulated. In respect of temperature distribution in the blast furnace shaft wall cooled with flanged casting iron stave, the influence of various factors on temperature distribution in blast furnace shaft wall was numerically stimulated. Those factors include kind of lining refractory, structure parameters of the flanged stave, temperature of gas flow in blast furnace and the erosion extent of the lining. On the basis of considering the main erosion mechanism of blast furnace lining/cooling system, the principal damage reason of the flanged part of a flanged...