Abstract
The raceway in front of tuyere of the blast furnace has been studied on an experimental furnace by means of penetration measurements, temperature measurements and gas composition survey. At the end of experiment, raceway is filled with light alumina particles carried by blast and is quenched with nitrogen gas. Then, profiles of the raceway, amounts and properties of coke in the raceway have been measured. The effects of operating variables such as amount of fuel injection, oxygen enrichment and blast temperature on the distribution of temperature and composition of gas have been studied.
As the change of reaction condition around the raceway, it results in movement of position where reaction of coke takes place. It causes change of gas volume distribution and disintegrated coke particle distribution. Then profile of raceway and path of gas in the furnace are affected.
In this way, the mechanism of shrinkage of raceway in the case of fuel injection which sometimes has been observed in the commercial furnace operation, is explained.
