Detection of Blast Furnace Hearth Lining Erosion by Multi-Information Fusion

The blast furnace hearth refractories are exposed to complex chemical attack and thermal stress erosion, which will lead to the gradual failure of refractories. The campaign life of a blast furnace depends on its remaining hearth refractory lining, so it is very important to understand the remaining thickness of hearth refractory for prolonging the service life of blast furnace. In order to understand the damage of hearth refractory more accurately, a multi-information fusion method for measuring the refractory lining thickness of blast furnace hearth was proposed, which was based on the application advantages of impact echo technology, thermocouple and cooling stave heat flux intensity in blast furnace hearth. The influence of temperature change in different material layers of hearth on wave velocity was considered. In addition, the thickness of carbon brick lining of blast furnace hearth was detected by the method of multi-information fusion. It is found that the multi-information fusion thickness detection method improves the accuracy of thickness measurement compared with the impact echo thickness detection method.