Adopting the advanced infrared imaging technology, the slag content of the molten steel in the process of converter/electric furnace discharging is detected in real time, the synchronous image is given with sound and light alarm, and the furnace lifting or slag blocking system are automatically controlled to provide the high-quality molten steel with little or no slag for the next process. When using the slag blocking linkage, according to the angle of the converter and the time of discharging, the slag blocking plug is automatically put in, so as to reduce the slag flowing into the ladle and further improve the purity of the steel.
Alarm accuracy | ≥99% |
Image acquisition speed | 30or50fps |
Image processing time | <20ms |
Distance between lens and converter | 8m-25m |
Ambient temperature | -40℃-120℃ |
Slag stopper hit rate ≥98%
Slag blocking success rate ≥96% Average slag thickness ≤70mm |
When use slag blocking linkage equipment |
From September 20 to September 25, after being put into use in the No. 2 converter of a special steelmaking branch, 114 furnaces were continuously tracked (two of which were tapped twice), of which there were 0 leak alarms and 1 alarm about slag entrapment, The accuracy rate is 99.12%. 2#
The recovery rate of molten steel after the converter is put into use for slag detection:
1#BOF: The number of smelting furnaces is 120, and the average molten steel recovery rate is 94.5%.
2#BOF: The number of smelting furnaces is 122 furnaces with an average molten steel yield of 95.2%.
Taking the phosphorus returned data analysis of the 1# and 2# converters (when slag detection is put into use) from September 20 to September 25
variable | Heater number | average value | Standard deviation | Lower quartile | median | Upper quartile |
Phosphorus returned | 1#BOF | 0.003264 | 0.002459 | 0.001850 | 0.003050 | 0.004125 |
Phosphorus returned | 1#BOF | 0.001490 | 0.002520 | -0.000300 | 0.001700 | 0.003100 |
Histogram of the amount of phosphorus returned to the converter
From the analysis of the above data, the average phosphorus returned of the 2# converter is lower than that of the 1# converter; the standard deviation of the phosphorus returned is basically close, that is, the stability of the phosphorus recovery is basically the same; the lower quartile and median of the phosphorus returned of the 2# converter And the upper quartile are lower than the phosphorus recovery of 1# converter.
Measurement method: After the converter is tapped, the ladle car is driven to the sand filling hole after the furnace, the bottom is adjusted to the wave surface without obvious tumbling state, a thin oxygen tube with a diameter of 6mm is inserted vertically into the ladle liquid surface, wait for 5~10 seconds to take out, measure
The length from position of the slag line to fuse point is recorded as slag thickness data. During the measurement, all the tapping processes of the furnace were added with 400Kg of compound slag according to the current process.
Steel Grade | Carbon steel | Low-alloy steel | Low-carbon steel | No distinction |
Measured value before use(mm) | 100 | 147 | 67 | 104.6 |
Target value(mm) | ≤80mm | ≤100mm | ≤50mm | ≤70mm |
Number of samples (furnace) | 176 | 29 | 118 | 316 |
Measured value after use(mm) | 54.8 | 55.2 | 43.6 | 50.4 |
The average thickness of the slag layer in the ladle does not exceed 70mm;
Compared with the average consumption of 2.4kg/t in previous years, the consumption of deoxidized aluminum has been reduced by 0.25kg/t;
The consumption of CM78 ferroalloy is 7018kgti lower than the average annual consumption of 21k/t
The consumption of CM78 ferroalloy is 7018kgti lower than the average annual consumption of 21k/t
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