| 摘要 |
FIELD: metallurgy. SUBSTANCE: condition of lance is rapidly estimated by analyzing dynamics of variation in smoothed time dependence of pressure of gas entering lance. In this dependence, as process advances, one searches for absolute minimum over the period from lowering lance in its lower position. Difference Δ<SB>1</SB>(i) between this minimum and the last value, difference Δ<SB>2</SB>(i) between last value and preceding one, and difference Δ<SB>3</SB>(j) between the first and last absolute minima are then found. If Δ<SB>2</SB>(i) = 0 and Δ<SB>1</SB>(i) = 0, lack of metallization of lance nozzle is stated. Increase of metallization of lance nozzle s(i) is recorded in case Δ<SB>2</SB>(i)>0,. If Δ<SB>2</SB>(i) = 0 and Δ<SB>1</SB>(i)>0, stabilization 3(i), and, if Δ<SB>2</SB>(i)<0 and Δ<SB>1</SB>(i)>0, reduction 3(i) are recorded. Shortening of lance Δ<SB>1</SB>(i)<0 is recorded when Δl(j). Numerical values 3(i) and Δl(j) are found in direct dependencies on Δ<SB>i</SB>(i) and Δ<SB>3</SB>(j), respectively. When 3(i) and Δl(j) exceed their allowable values, failure of lance is stated. EFFECT: facilitated process control. 2 dwgg
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