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

Abstract

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 refractory 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. INDEX TERMSBlast furnace hearth, cooling stave heat flux intensity, multi-information fusion, simulation, thermocouple, thickness detection JIAOCHEN MA was born in Shanxi, China, in 1979. He received the B.Eng. and M.Eng. degrees in mechanical engineering and the Ph.D. degree in detection technology and automation device from

Observations and improvements on the impact-echo method used for blast furnace hearth refractory measurement

“…In Ref. [12], the result from an impact-method measurement based on the PRF method compensated for temperature effects is compared with the results from a thermal model, and initially, large deviations were found of about 29%. To solve this issue, the sound velocities were adapted to harmonize the results.…”