| According to the specific quality of Xinjing coal, for concern of safety during coal injection into a BF, conventional qualitatively study a method for coal powder explosion does not meet the need of scientific study. A new method of quantitative describe the parameters during the coal powder injection explosion processes has been developed, which is based on the IEC standard related to dust explosion study method. Different from the under atmosphere pressure; the discovered method can detect the related parameters under given pressure and temperature which is to a coal injection system of a BF. To carry out the experiment, by cooperation, there related experimental equipments have been developed, including a 20L dust explosion device with special condition controlling and detecting system, a MITCC test device, which meet the needs of IEC standard, a MIT(L) test device. These devices are the all first ones in China, respectively test.A large-scale investigation was carried out for choosing coal and their mining site in Xinjiang area. The kinds of coal used for BF injection were selected according to Xinjiang economic and local coal quality. In this paper, explosiveness of coal powder was analyzed with advanced device and method, means of inhibiting explosion and process parameters were studied, and an inhibiting reagent was discovered.Up to now, the bituminite rate in the injected coal has reached to 95%, which is the best in China on a similar BF. With the nearby Sulphur-ditche bituminite, the cost of spraying the bituminte powder into a BF per ton is 150 yuans, while that of the second metallurgical coke is 430 yuans, if one bituinmite powder displaces 0.8 ton metallurgical coke, 194 yuans cost has been cut down when each ton of bituinmite powder has been sprayed into a BF. Which results in a large economic efficiently. Therefore, coal injection is the most effective technique measure to decrease the cost and increase the competition ability of a BF.
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