Abstract
The distribution of burden layers in an ironmaking blast furnace strongly influences the conditions in the upper part of the process. The bed permeability largely depends on the distribution of ore and coke in the lumpy zone, which affects the radial gas flow distribution in the shaft. Along with the continuous advancement of technology, more information about the internal conditions of the blast furnace can be obtained through advanced measurement equipment, including 2D profiles and 3D surface maps of the top burden surface. However, the change of layer structure along with the burden descent cannot be directly measured. A mathematical model predicting the burden distribution and the internal layer structure during the descending process is established in this paper. The accuracy of the burden distribution model is verified by a comparison with experimental results. A sensitivity study was undertaken to clarify the role of some factors on the arising layer distribution, including the descent-rate distribution, the initial burden surface profile, and the charging direction through the charging matrix. The findings can be used as a theoretical basis to guide plant operations for optimizing the charging.
Highlights
A proper distribution of burden materials in an ironmaking blast furnace (BF) has been commonly recognized as a basic prerequisite for an appropriate distribution of burden permeability, which, in turn, facilitates the distribution of the ascending gas originating in the raceways
Based on the above reviews, a mathematical model using the Polygonal Line (PL) method of the burden surface profile has been verified in a reduced-scale (1:10) experiment [12] and applied for the automatic generation of charging programs satisfying certain criteria concerning the radial distribution of the burden [25]
The model, which has been validated by a comparison of its results with top scanner information from an operating BF, has been applied to study the effect of some user-specified parameters in order to gain a better understanding of the complex engineering system at hand
Summary
A proper distribution of burden materials in an ironmaking blast furnace (BF) has been commonly recognized as a basic prerequisite for an appropriate distribution of burden permeability, which, in turn, facilitates the distribution of the ascending gas originating in the raceways. Based on the above reviews, a mathematical model using the Polygonal Line (PL) method of the burden surface profile has been verified in a reduced-scale (1:10) experiment [12] and applied for the automatic generation of charging programs satisfying certain criteria concerning the radial distribution of the burden [25]. A more comprehensive mathematical model based on the aforementioned PL method has been developed and further extended by adding functions to analyse the influence of different boundary conditions, such as the initial burden surface, the descending velocity profile, and the charging direction (inward and outward). Some conclusions and suggestions for future work are presented
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