Analysis and Monitoring Method of Blast Furnace Lining Erosion

Abstract

The invention provides a method for analyzing and monitoring blast furnace lining erosion, which comprises the following steps: 1) uniformly arranging thermocouples radially along the hearth; 2) establishing a database connection, importing refractory materials and cooling system parameters; 3) establishing boundary conditions, According to the data imported in step 2) to establish a heat transfer model; 4) use the computer to perform numerical analysis on the heat transfer model according to the measured value of the thermocouple, and finally obtain the position of the isotherm; 5) write the model calculation results into the database, and the computer will After reading the database in real time, it displays the position change and shape of the erosion boundary, saves the calculation results and forms historical data and historical curves. The invention can avoid the rapid erosion of carbon bricks and ring cracks; at the same time, it can prevent the hearth from thickening and affect the forward movement of the blast furnace; it can also prevent the center of the hearth from accumulating, and the junction between the hearth and the bottom of the furnace from being eroded; In particular, the adjustment of the cooling water volume ensures that the heat flow intensity of the furnace hearth and furnace bottom is within an appropriate range.

Description

technical field [0001] The invention is used for on-line monitoring and analysis of lining erosion of ironmaking blast furnaces in the metallurgical industry, and provides necessary guidance for blast furnace operation. Background technique [0002] After the blast furnace was put into production, the working conditions of the hearth bottom were particularly bad. As the part containing high-temperature molten iron, the refractory lining was eroded by the physical and chemical effects of molten iron, and the erosion gradually increased with the service time. Repairing during the production process like other parts of the blast furnace is the main limiting link of the first-generation blast furnace. The study of lining erosion is of great significance to the safe production and economic and technical indicators of the blast furnace. [0003] At present, domestic iron and steel enterprises have three main methods for hearth bottom detection: [0004] (1) Ultrasonic detection m...

AI Technical Summary

Problems solved by technology

Due to the high temperature and harsh conditions of the hearth, ultrasonic waves are often distorted, and the number of ceramic or metal rods buried at the same time is limited, which cannot fully reflect the full state and erosion degree of the hearth

[0005] (2) Platinum resistance detection method. Although the detection accuracy of platinum resistance is high, it is expensive. It is generally used to detect low temperature data such as cooling water inlet and outlet temperatures.

[0006] (3) Heat flux density meter, generally used for offline detection of a certain part, rarely used for online continuous measurement

[0007] Although the above detection methods are feasible, they all estimate the corrosion of the furnace body by accumulating detection data. There are still many problems in the long-term stable operation, which need to be further improved.

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