Processes for the injection of pulverised coal into the blast furnace

Five types of pulverised coal have been tested in the facility. The results show that, in the grain size range tested for;he son brown coal grades, th e grain size has no detectable influence on the degree of combustion. The d egree of combustion of the hard coal grades, however, is strongly dependent on the grain size. During the tests, the levels of volatile constituents a nd the C/O ratio of the coal grades have emerged as characterising paramete rs. A combustion model has been used to calculate the further combustion pr ocess of the char left over from the injected media in the raceway. Lf the hot blast temperature is increased, it can achieve a stronger effect than e nriching the blast with oxygen. A reserve possibility for complete gasifica tion of the injected media in the tuyere zone comes about from the direct r eduction of the iron oxide with the carbon of the injected media. A downwar d-dripping slag with an FeO content of 27.55 % is capable of reducing 4.51 kg carbon/t HM into CO.