Study on the industrial feasibility of adding lignite for blast furnace

Abstract

Lignite resources in China are abundant and cheap. The application of lignite resources is one of the promising solution for the energy crisis of industries in China. In the present work, the resources of coal mines around Kunming, Yunnan Province, P.R. China were investigated. After considering various factors, the Mile coal was selected as the supply for the lignite experiment. Conducting the industrial analysis and properties experiments on the single lignite and mixed coal of different proportions. On the basis of ensuring safety, and the coal blending structure of 60% anthracite-35% bituminous coal-5% lignite has been selected for the industrial test in no. 3 blast furnace of a steel plant. At the same time, the data of the blast furnace condition in the reference period and the test period were collected and compared. We can conclude that the blast furnace with 60% anthracite-35% bituminous coal-5% lignite injection test was stable, safe and feasible. Finally, according to the replacement ratio of lignite and bituminous coal, the economic benefits of lignite instead of bituminous coal was evaluated, and the results were more optimistic, which achieved the effect of reducing costs for the factory.