Coal powder pure oxygen blast furnace ironmaking process and equipment thereof

Abstract

The invention provides a pulverized coal pure oxygen blast furnace ironmaking technical method. The technical method is as follows: on the basis of the blast furnace spraying pulverized coal process, a mixed gas of oxygen enriched air or oxygen and vapor is preheated to the temperature of between 900 and 1500 DEG C by a regenerative hot blast furnace, the pulverized coal is sprayed in a high temperature gas generator or gas generator, at the same time, the mixed gas preheated at a high temperature is also sprayed into the high temperature gas generator or gas generator, the pulverized coal and the mixed gas undergo gasification reaction in the high temperature entrained flow gas generator or gas generator, 90 to 95 percent of dust in the high temperature coal gas is removed by a high temperature combined dust collector, the high temperature coal gas is directly sprayed into the lower part of a furnace body of the blast furnace to take part in the ironmaking reaction, blast furnace materials are mainly acid pellet, and properly part of high basicity sinter, for each ton of iron, 1200 to 1750m<3> of the high temperature coal gas and 80 to 120m<3> of oxygen is blown in the blast furnace. The method has the advanges of well saving energy, greatly lowering spraying coal cost, improving the unit volume capacity of the prior blast furance by more than 50 percent and making the utilization coefficient reach nearly 6T(M<3>day and night). Being capable of preparing low silicon good quality molten iron, the method greatly reduces the consumption of oxygen for steel-making, and contributes to the realization of a novel techique for making steel with little slag.

Description

technical field [0001] The invention relates to a smelting process and its equipment, in particular to a pulverized coal pure oxygen blast furnace ironmaking process and its equipment. Background technique [0002] It is estimated that in the next 100 years, blast furnace ironmaking will still be the main means of iron ore reduction. Research on the maximum use of pulverized coal instead of coke and pure oxygen instead of air blast furnace ironmaking has been a major research topic for metallurgical scientists at home and abroad for nearly a century. After the 1980s, some major scientific researches have been made results. [0003] In the 1980s, various high-oxygen-enriched (full-oxygen) blast furnace technical solutions were proposed one after another, all of which used preheated gas injection in the furnace body to solve the problem of "upper cooling". Or water vapor to balance (see Table 1). In this type of scheme, the FOBF-I process proposed by our country can fully r...

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Problems solved by technology

Because the industrialized application is still immature, countries in the world put the above-mentioned process method into the industrialized application and there is no report yet

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