Mixing‐time correlation in top gas stirred melts

Koria, Satish C.; Lange, Klaus W.

doi:10.1002/srin.198405317

Cited by 3 publications

(1 citation statement)

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“…Investigations made under combined blowing are, however, much more infrequent. Methods have varied from the measurement of variation of electrical conductivity [18][19][20][21][22][23][24][25][26][27][28][29][30][31] or pH [32][33][34][35][36] of the bath to chemical decolouration methods 23,25,33,37,38) or even determining the mass transfer rate constant 18,[39][40][41][42][43][44] of a two phase system. Since bath motion affects e.g.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Bottom Nozzle Configuration on the Bath Behaviour in the BOF

2004

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Due to the different nature of the required measurements, two separate water models were utilised. Both models have the same geometry and dimensions; scaled down to 1 : 7. The operational and geometrical parameters of the physical model and the prototype are presented in Table 1. Figure 1 shows the location of bottom nozzles for 3, 4 and 5 nozzle arrangements. The two lance positions used in splashing and oscillation studies are also displayed in the same figure. Measurement of Splashing and SpittingSplashing and spitting behaviour in the combined blown converter vessel was studied with the new method, which is previously described elsewhere in more detail. 17) Since the whole model wall is perforated, the experimental set-up enables studying overall splashing distribution on the model wall. Spitting is referred to as water droplets collected from the mouth of the converter model by an absorbent cloth. Measurement of Mixing TimeThe experimental apparatus and auxiliary instruments for ISIJ International, Vol. 44 (2004) The blowing behaviour of the BOF is affected in many ways by the behaviour of molten bath. Bottom blowing and its interaction with top blowing have a strong influence on splashing and spitting behaviour, bath homogenisation and bath oscillation. Therefore, three selected bottom nozzle configurations were studied by physical modelling, and the results were compared regarding splashing, homogenisation and oscillation of the bath. According to model tests, bottom nozzle positioning has a great influence on the amount and direction of splashing and spitting. Moreover, at lower lance gaps, the direction of splashes was changed because of bath oscillation. At low lance gap, when type A oscillation is dominant, correlation between the degree of overlap and stability of the bath was found. The bigger the degree of overlap, the more unstable the system as far as type A oscillation and splashing is concerned. The amplitude and oscillation frequency of the bath changed as a function of lance height. Blowing through bottom nozzles prevented the onset of so called type A oscillation. Bottom nozzle configuration of three nozzles resulted in shortest mixing time, lowest total splashing on model walls and longest starting time of type A oscillation.

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