Method for determining position of erosion line of hearth of blast furnace

Abstract

The invention discloses a method for determining the position of an erosion line of a hearth of a blast furnace and belongs to the technical field of prolonging service life of the blast furnace. Compared with the prior art, the method for determining the erosion line of the hearth of the blast furnace has the advantages that the calculation amount is small, and accuracy is high. According to the method, a temperature field in a brick line of the hearth is directly calculated based on a steady-state heat conduction equation by a method for stabilizing a grid by using finite elements or finite difference; the heat conductivity coefficient of the brick lining is determined according to the temperature of grid nodes in iterative computation; if the temperature is more than 1,450 DEG C, the temperature field in the brick lining of the hearth is calculated and determined by using the effective heat conductivity coefficient of molten iron; the position of the position of the 1,150-DEG C erosion line is determined according to the temperature field; according to the method for determining the position of the erosion line, the temperature field is only needed to be calculated once; and compared with the conventional method, the method has the advantages that the calculation amount is greatly reduced, the calculation cycle is shortened, various requirements of operation of the blast furnace can be met, the calculation stability is greatly improved, and the division temperature of the molten iron and the brick line is set to be 1,450 DEG C, so that the actual requirement of the blast furnace can be met.

Description

Technical field [0001] The invention belongs to the technical field of blast furnace longevity and is used for determining the position of the 1150°C erosion line in the ironmaking blast furnace hearth of the metallurgical industry and providing basic information for the operation of the blast furnace. Background technique [0002] One of the keys to blast furnace longevity and high-efficiency and stable production is the timely and accurate monitoring of the state of the blast furnace hearth. For this reason, a large number of blast furnace hearth monitoring systems have been developed at home and abroad, mainly to monitor the position of the 1150°C erosion line in the hearth. The mainstream method is to determine the position of the erosion line at 1150°C through the calculation of the heat transfer model based on the temperature information of the thermocouples in the hearth lining. The optimization method assumes the position of the erosion line at 1150°C, and then uses ...

AI Technical Summary

Problems solved by technology

This way the calculation grid is stable and easy to set, the calculation accuracy is guaranteed, and the calculation amount is greatly reduced, but it also needs to repeatedly calculate the temperature field, resulting in a large amount of calculation, and 1150°C is regarded as the hot metal area and brick lining The demarcation point is not reasonable, because the thermal conductivity of molten iron is much higher than that of the brick lining, the temperature at the contact point between the brick lining and the molten iron in the actual blast furnace should be close to the main body temperature of the molten iron

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