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Abstract

The present disclosure provides a pre-reduced pellet preparation device and method based on grate-rotary kiln. The pre-reduced pellet preparation device comprises a grate-rotary kiln pellet oxidation system and a hydrogen-based shaft furnace reduction system. In the pre-reduced pellet preparation method, a roasting process and a reduction process for an iron-containing green pellet are organically combined, and a pellet cooling process after roasting and a heating process before pellet reduction are eliminated; physical heat of a roasted pellet is used to satisfy heat required in the heating and reduction processes; the technical problems of a low hydrogen utilization rate and high energy consumption of pellets in oxidative roasting and direct reduction processes in traditional direct reduction processes are solved; a reduced pellet having a certain metallization rate is obtained; the prepared pre-reduced pellet is used as blast furnace burden, such that blast furnace fuel consumption and carbon emission can be significantly reduced; the method is a new, low-carbon, and green pre-reduced pellet preparation process.

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First Claim