Numerical Simulation And Experiment Research On The Character Of Tuyere Raceway Of Blast Furnace

The tuyere raceway of blast furnace is an important reaction area in blast furnace. The formation and reaction of raceway is greatly affecting the airflow at the bottom of BF, the activity of hearth charge falling and the chemical energy and heat energy needed for production in BF. With the development of the large BF,because the material layer diameter and height of large BF was bigger , the reasonable control of the formation and reaction process of tuyere raceway on the temperature and gas compositions in BF was important. In order to create optimum smelting conditions of BF, control precisely production in practice and develop the advantages of large BF,it was important for studying and analysis the characteristics and change law of large BF .In this text, based on the technological condition of BF 2000m3 for PISC, aimed at the original and fuel conditions of BF 2000m3 for PISC, the correlated factors affecting raceway characteristic and the each factor influence rules on the raceway characteristic were investigated by the physical model and numerical simulation study. The specific research results were as bellows:①On the basis of the similarity theory, physical model experiment equipment was designed and made. In the experiment research, the effect of blast volume ,tuyere diameter,tuyere insertion depth,tuyere inclination angle on the depth and height of raceway was investigated. The research result showed: the descending influence order of the depth and height of raceway was tuyere diameter,blast volume ,tuyere inclination angle, tuyere insertion depth ; when the blast volume was the same, the tuyere diameter grew lager, the depth of raceway grew smaller ;when the tuyere diameter was the same, the blast volume grew lager, the depth of raceway grew lager ;when tuyere insertion depth was 450mm and tuyere inclination angle was 5°, the depth of raceway was biggest, the working state of hearth was good for activities. According to the experiment results, the quantitative relation between the depth and height of tuyere raceway of BF and the operation parameters was obtained by using of the regress theory.②The comprehensive mathematical model that could reflect the flow ,heat transfer ,mass transfer and chemical reaction of tuyere raceway of BF and boundary condition was built. Numerical simulation study was made. The effect of blast volume ,blast temperature,enriched blast and tuyere inclination angle on chemical reaction characteristics of raceway was investigated. The research result showed as follows: the complete combustions reaction of carbon was in dominant positions in front of tuyere, after a section of distance of the front end of tuyere ,the main reaction was the incomplete combustion reaction and the solution loss of carbon .In the same time, the effect of blast volume,blast temperature,enriched blast,tuyere inclination angle on the gas component distribution rules were studied. The research results that were obtained by numerical simulation study were in basic agreement with the general rules.The research results above could provide the theoretical basis for optimizing smelt operation in practice production.