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가스 또는 고체분말 취입시 Lance 의 폐색에 관한 연구
유병돈,Polanschutz, W.,Hiebler, H. 대한금속재료학회(대한금속학회) 1984 대한금속·재료학회지 Vol.22 No.12
To investigate the clogging of the lance during the injection of gas with or without powder, a model study on the penetration behaviour of liquid into the nozzle was carried out in water, water-glyceline mixtures, mercury and also molten pig iron. In cold models, the penetration of liquid into the nozzle was determined using an electric contact method. On the other hand, the penetration depth of the molten pig iron was measured on the lance which was cut open after the runs. A regression analysis was made to predict the relationship between the penetration depth of the liquid into the perpendicularly downward facing nozzle and the influencing factors, such as the surface tension, the densities of gas and liquid, the viscosities of gas and liquid, the inner diameter of nozzle, and the gas flow velocity. It was shown that the penetration behaviour of the liquid into the nozzle depends on the gas flow velocity, the inner diameter and orientation of nozzle, and the densities of gas and liquid. The penetration behaviour was reduced with powder injection compared to gas only injection. The comparison of results about penetration behaviour of liquid into the nozzle showed that the understanding won for cold models can be carried over to the conditions in molten pig iron.
유병돈 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.12
The reduction of blowing time is important to improve the productivity and lining life of the BOF. To reduce the blowing time, various blowing patterns of BOF of 100 tonne in production capacity have been investigated and the effects on the operating factors were evaluated. The rate of oxygen supply through the lance was increased considering the cavity depth during the blow. The new blowing patterns resulted in a increased flow rate and {CO} concentration of off gas, and {CO₂} concentration was decreased slightly. In the middle stage of the blowing, the maximum decarburization rate and the oxygen efficiency for decarburization were increased by about 20% and 10% respectively. As a result of the modification of blowing pattern, the blowing time could be shortened by about 1.5 to 2 minutes. The increased oxygen flow rate resulted in a hard blow and the efficiency of dephosphorization was slightly decreased during the blow. However, this problem could be solved by lowering the target of [C] content at blow end.