Process for blasting oxygen-enriched hot blast to blast furnace and device applied to same

Abstract

The invention relates to a process for blasting oxygen-enriched hot blast to a blast furnace and a device applied to the same. The process comprises the following steps: producing oxygen-enriched air, preheating the oxygen-enriched air or air mixture of the oxygen-enriched air and the air to obtain oxygen-enriched hot blast and blasting the oxygen-enriched hot blast to the blast furnace. The device comprises an enriched oxygen producing device, a blower and a hot blast furnace, wherein the inlet of the blower is communicated with the outlet of the enriched oxygen producing device and the air respectively via pipelines; the outlet of the blower is communicated with the air inlet of the hot blast furnace; and the air outlet of the hot blast furnace is communicated with the tuyere of the blast furnace. By blasting the oxygen-enriched hot blast with higher concentration to the blast furnace and improving the coal injection ratio, utilization factor and yield of the blast furnace by preheating, the invention has the advantages of reducing the coke ratio, improving the ironmaking efficiency, lowering the ironmaking cost and reducing CO2 exhaust. The invention can also compute the energyconservation effect of oxygen-enriched blast more precisely and provide a good medium for energy performance contracting.

Description

technical field [0001] The invention relates to a blast furnace oxygen-enriched blowing technology, in particular to a blast furnace oxygen-enriched hot blast blowing process and a device for its application. Background technique [0002] Blast furnace oxygen-enriched injection technology is an important measure for blast furnace to increase production, reduce coke ratio and improve comprehensive benefits. The existing blast furnace oxygen-enriched injection technology is to inject high-pressure or low-pressure pure oxygen into the blast furnace through a blower or an oxygen coal gun. This prior art has disadvantages such as high cost of oxygen, high power consumption, complex equipment and pipelines, and cumbersome safety protection facilities. More importantly, this oxygen supply method uses oxygen at normal temperature. If the oxygen-enriched concentration is too high, it will easily cause the furnace condition of the blast furnace to be unsatisfactory, which seriously h...

AI Technical Summary

Problems solved by technology

This existing technology has disadvantages such as high oxygen cost, high power consumption, complex equipment and pipelines, and cumbersome safety protection facilities.

More importantly, this oxygen supply method uses oxygen at normal temperature. If the oxygen-enriched concentration is too high, it will easily cause the furnace condition of the blast furnace to be unsatisfactory, which seriously hinders the further improvement of the coal injection ratio of the blast furnace, the improvement of the utilization factor, or the reduction of the cost. Furnace coke ratio increases the blast furnace smelting cost of iron and steel enterprises, which is not conducive to saving the country's increasingly depleted coking coal resources, and is not conducive to the realization of the strategic goal of energy conservation and emission reduction of the iron and steel industry

[0003] It can be seen that the above-mentioned existing blast furnace oxygen-enriched injection technology obviously still has inconvenience and defects in terms of device structure, process method and use, and needs to be further improved urgently.

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