Study On Conveying Property Of Pulverized Coal Injection Into Baoshan Iron And Steel Corp's Blast Furnace

The conveying property of pulverized coal is described with the conveying mass of pulverized coal in unit-time. The experimental project is designed according to the actual technologic parameters of blast furnace's pulverized coal injection. The conveying property of pulverized coal is measured in different qualities and different technologic conditions by means of the conveying property measurating device of pulverized coal which is developed by ourself. Following conclusions are gained through experiments:The actual critical fluided velocity of pulverized coal is larger obviously than the theoretic critical fluided velocity of pulverized coal. The fluided process of pulverized coal is divided into three phases, that is the immobile bed, the fluided bed and the airflow bed. Rest angle is a static technologic parameter of pulverized coal. The conveying process of pulverized coal is relative to the fluided behaviour of pulverized coal in fluided jar and the suspending and moving state of pulverized coal in conveying pipeline. Therefore, it is inaccurate that rest angle describes the conveying property of pulverized coal. The effect of coal category on the conveying property of pulverized coal is obvious. Because the content of fusinite in bituminite is great and the viscosity of fusinite is weak, the conveying property of bituminite is better than that of anthracite. With the content increasing of anthracite, the conveying property of mixed pulverized coal become worse. The finer the granularity of pulverized coal, the better the conveying property of pulverized coal, which is relative to the interforce of pulverized coal grain. The conveying property of pulverized coal is the best when the content of water in pulverized coal is about 2.0 percent. When the content of water in pulverized coal is low, the conveying property of pulverized coal is improved with the content increasing of water in pulverized coal. When the content of water in pulverized coal is high, the conveying property of pulverized coal becomes worse with the content increasing of water in pulverized coal. Because the physical and chemical property of pulverized coal are not changed basically when the gas-solid ratio changes, the rules of pulverized coal's conveying coal in dense-phase conveying are same to that in sparse-dense conveying on the whole. When the physical properties of the conveying mediums are similar, the conveying property of pulverized coal doesn't change obviously. That is because the physical and chemical properties of pulverized coal don't change obviously and the fluided behaviour of pulverized coal in fluided jar and the suspending and moving state of pulverized coal in conveying pipeline don't change obviously.