Erosion prediction method for blast furnace hearth with multi-layer refractory brick furnace wall structure

The present invention relates to the field of maintaining multi-layer refractory bricks of blast furnaces, and particularly relates to an erosion prediction method for a blast furnace hearth. The erosion prediction method for a blast furnace hearth with a multi-layer refractory brick furnace wall structure comprises: selecting a group of thermocouples, arbitrarily selecting a couple of thermocouples from the group of thermocouples, and calculating a value range of a corresponding erosion congealing point; layering a side wall of the furnace hearth, setting a deviation threshold condition, performing reverse calculation to obtain a calculated temperature value of each thermocouple in the group of thermocouples, comparing the calculated temperature value with an actually measured temperature value, and when a comparison result satisfies the deviation threshold condition, determining the point as the erosion congealing point; calculating each group of thermocouples to obtain the erosion congealing point corresponding to each group of thermocouples, fitting all the erosion congealing points to obtain an erosion congealing line. According to the present invention, the side wall of the furnace hearth is layered according to the heat transfer coefficient, and the value range is determined according to the actually measured values of the thermocouples, so that a calculation error of a manually set range is eliminated, and the finally obtained erosion congealing line is more accurate.