A control method of blast furnace blast system with oxygen enrichment before the machine

Abstract

The invention provides a control method of a machine-front oxygen-rich blast furnace air blowing system. An air blower of the machine-front oxygen-rich blast furnace air blowing system is communicatedwith an air inlet pipe and an air outlet pipeline. Air is sucked into the air blower through the air inlet pipeline, pressurized by the air blower and then sent into a blast furnace through the air outlet pipeline. The air inlet end of a recycling pipeline is communicated with the air outlet pipeline, and the air outlet end of the recycling pipeline is communicated with the air inlet pipeline. The recycling pipeline is connected with a first adjusting valve in series. The control method includes the steps of obtaining operating parameters of the air blower, judging whether the operating parameters meet first preset conditions or not, and controlling the first adjusting valve to be switched on when the operating parameters meet the first preset conditions. The control method can more flexibly adjust the air outlet pressure without influencing the normal production. Meanwhile, the oxygen flowing into the environment through an anti-surge valve can be reduced, resource waste is reduced,production cost is reduced, and the machine-front oxygen-rich blast furnace air blowing system saves more energy. The oxygen enrichment rate of the blast furnace inlet air can be further improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a control method for an oxygen-enriched blast furnace blast system before a machine. Background technique [0002] Blast furnace oxygen enrichment is one of the main ways to increase smelting intensity in modern blast furnace production. The method is to add oxygen to the blast furnace blast, so that the oxygen content of the blast exceeds the oxygen content of the atmosphere. Theoretically, for every 1% increase in the oxygen content in the blast, the iron production of the blast furnace will increase by 4.76%. Blast furnace oxygen enrichment can also increase the coal ratio and reduce the coke ratio, thereby reducing the production cost of the blast furnace. In the statistical data of each year, the average oxygen enrichment rate of blast furnaces with different volume levels in the country has increased year by year, and the oxygen enrichment rate of blast furnaces with a...

AI Technical Summary

Problems solved by technology

Due to the reduction of the air supply volume of the blower, the operating condition of the blower deviates from the original design condition, and the operating efficiency of the blower decreases; the blower runs close to the anti-surge line, and the anti-surge valve has to be opened for a long time to let the compressed part of the cold air and oxygen are released into the atmosphere, causing waste and restricting the further improvement of oxygen enrichment rate

[0004] In order to improve the efficiency of the blower and avoid the waste of oxygen release, the structure of the blower body needs to be modified, but the modification needs to redesign and adjust the structure, rotor power and strength of the blower, which is costly and takes a long time to affect the normal operation of the blast furnace. Production

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