Blast Furnace Body On-line Thickness Measurement System Design

To protect the natural labor, high yield of blast furnace and prolong blast furnacecampaign life, in the process of production need to real-time monitor the running state ofblast furnace. The erosion of blast furnace directly affect the service life of blast furnace, someasuring the thickness of the blast furnace for steel smelting production has a realisticsignificance. Because the ultrasonic testing has real-time, nondestructive, simple structure,reliable performance and high measurement precision, become one of the important methodsof blast furnace body thickness measurement. But the spread of ultrasonic nondestructivetesting method based on ultrasonic, when applied to blast furnace body thicknessmeasurement, blast furnace inside the special environment of high temperature and highnoise lead to the spread of ultrasonic is affected. This effect is mainly for attenuation andinterference, eventually leading to ultrasonic echo signal quality cannot meet themeasurement requirements. To solve this problem, by analyzing the principle of ultrasonicwave propagation in metal medium, the influencing factors of ultrasonic transmission include:divergent, scattering attenuation, absorption and transmission attenuation, thermal noise, etc.Analysis found that the ultrasonic signal travels in metal medium attenuation due totemperature increase, and the absorption attenuation and scattering attenuation is the mainreason for decline in ultrasonic echo signal SNR. Then on the basis of a large number ofexperiments, the ultrasonic signal data in time domain and frequency domain analysis, underthe environment of high temperature ultrasonic signal propagation characteristics. Based onthe above analysis, targeted optimization related hardware such as ultrasonic transmitting andreceiving circuit, so as to improve the quality of the ultrasonic signal. Combined with digitalsignal processing technology, on the DSP processor platform of ultrasonic signals for furtherprocessing. Design includes the human-computer interaction function, convenient for personalized parameter Settings and information query. The experiment proves the feasibilityand practicability of the scheme.