Ramon BOF/EAF Slag Detection System

Ramon BOF/EAF Slag Detection System

This system adopts advanced infrared imaging technology to real-time detect slag content in molten steel during tapping of BOF/EAF, and sendsimultaneous imaging and sound-light alarming, it also can automatic control furnace tiltingor start slag stopper,to ensure qualified molten steel with less or non-slag are provided for next metallurgy process.

Feature

  • Lens is installed at high temperature environment, adopting air cooling and dustproofblowing. Long service life.
  • It adopts optical fiber for long distance image transmission with high anti-electromagnetic interference ability.
  • Images are clear and smooth, and it is easy to distinguish gradation of image between molten steel and slag.
  • It can distinguish the variation of cold steel, smoke, flame, steel stream at tapping hole, without false alarm.

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Technology

  • Alarm Accuracy:≥99%;
  • Image capturing speed(fps):30or50;
  • Image processing time(ms):<20;
  • Distance between lens and converter(m):8~25;
  • Ambient temperature(℃):-40~120;

Structure

Product advantages

Increase of the yield of molten steel
This system isapplied at 2# converter of one steel plant and after continuous tracing 114 heatsfrom 20th Sept to 25th Sept(including there are two heatswhich tapped twice each), the system performance are given as follow: miss alarm: 0 time; slag entrapment alarm:1 time; alarm accuracy rate: 99.12%; And following is molten steel yield status for 2# converter:

1#BOF:120 heats of smelting, average yield of molten steel is 94.5%;
2#BOF:122 heats of smelting, average yield of molten steel is 95.2%;

Reduce rephosphorization of molten steel

Analysis the rephosphorization data of 1# & 2# converter dated from 20th Sept to 25th Sept:


Item

No.

Average fig.

Standard deviation

Lower quartile

Median

Upper quartile

Rephosphorization

1#BOF

0.003264

0.002459

0.001850

0.003050

0.004125

Rephosphorization

2#BOF

0.001490

0.002520

-0.000300

0.001700

0.003100



Based on the above data analysis,average rephosphorization of 2# converter is lower than 1# converter;Standard deviation is almost close (i.e., rephosphorization stability is almost same); Upper quartile, median and lower quartile of rephosphorization of 2# converter is lower than 1# converter.

Reduce slag thickness of ladle 

Measure method: after completion of converter tapping, ladle car moves to sand fill hole, then adjust bottom blowing till no obvious rolling of molten steel surface; adopt φ6mm oxygen tube to plug into molten steel surface vertically and get it out after 5-10 seconds, measure the length from slag line to fusing point and record it. During measurement, 400Kg compound slag charge was added to all heats of tapping as per prevailing process.

Steel type

Medium CB

Low alloy steel

Low CB

Not-specified

Measure value before application(mm)

100

147

67

104.6

Target value(mm)

≤80mm

≤100mm

≤50mm

≤70mm

Number of sample(heats)

176

29

118

316

Measure value(mm)

54.8

55.2

43.6

50.1

Cases

Contact number

Headquarters:+86-734-8892110/2111/2112

Changsha Branch:+86-731—88702051/205

Beijing Research Institute:+86-10-82525300


 Sales Email:   overseasales@ramon.com.cn , overseas@ramon.com.cn


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