Blast oxygen enrichment energy-saving technology and device for blast furnace

Abstract

The invention discloses a blast oxygen enrichment energy-saving technology of a blast furnace. The blast oxygen enrichment energy-saving technology comprises the following steps that: cold blast is pressurized by a blast furnace blower and then enters a blast oxygen enrichment energy-saving device of the blast furnace, airflow produced by the cold blast injects oxygen in an injection device into the blast oxygen enrichment energy-saving device of the blast furnace, and oxygen-enrichment cold blast obtained by mixing the cold blast with the oxygen is heated by a blast stove and then is fed into the blast furnace for use, wherein the pressure of the oxygen is smaller than the pressure of the cold blast. The invention further discloses a blast oxygen enrichment energy-saving device of the blast furnace, which comprises the blast furnace blower, the blast oxygen enrichment energy-saving device of the blast furnace and the blast stove, wherein the blast oxygen enrichment energy-saving device of the blast furnace comprises the injection device, and a cold blast pipeline and a receiving chamber which are sequentially communicated with each other along the airflow direction, the injection device comprises a circular distribution pipe and at least one branch injection pipe, the circular distribution pipe is connected with an oxygen pipeline, the intake end of the branch injection pipe is connected with the circular distribution pipe, the air outlet end of the branch injection pipe is positioned in the receiving chamber, and the injection direction of the branch injection pipe is the same as the cold blast flow direction of the blast oxygen enrichment energy-saving device of the blast furnace.

Description

technical field [0001] The invention belongs to the technical field of blast furnace oxygen-enriched injection, in particular to a blast furnace blast oxygen-enriched energy-saving process and device. Background technique [0002] At present, there are two methods of oxygen enrichment in the blast furnace: oxygen enrichment before the blower and oxygen enrichment after the blower. For example, the Chinese patent with the publication number CN 102010919A discloses a blast furnace oxygen-enriched hot blast blasting process and a device for its application. The hot air blowing process adopts the oxygen-enriched method before the blower, and its process steps include: preparing oxygen-enriched gas; preheating the oxygen-enriched gas or the mixture of oxygen-enriched gas and air into oxygen-enriched hot air; inputting the oxygen-enriched hot air into the blast furnace. Although the blast furnace oxygen-enriched hot air blowing process can meet the oxygen-enriching requirements of...

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Problems solved by technology

Therefore, the oxygen station needs to be specially equipped with an oxygen compressor with a higher exhaust pressure to meet the process requirements, and the equipment investment and operating costs of the oxygen compressor are relatively high.

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