Method for preventing electric precipitation explosion venting during blowing igniting of semi-steel steelmaking

Abstract

The invention provides a method for preventing electric precipitation explosion venting during blowing igniting of semi-steel steelmaking, and belongs to the technical field of converter steelmaking methods. According to the technical scheme, the mixed gas of oxygen and nitrogen is used for igniting and blowing in the blowing stage, instead of single oxygen; the total amount of the mixed gas is the amount of the oxygen supplied for normal blowing, wherein the flow rate of oxygen is 50 to 60% of the amount of oxygen supplied for normal blowing; the gas supply pressure required by normal blowing is provided to a smelting pool; the jet impact area and penetration depth are improved; the igniting time is reduced; if the raise of the temperature of an inlet of an evaporative cooler is beyond 4 DEG C, the flow rate of oxygen can be gradually raised, and simultaneously the flow rate of nitrogen can be reduced; the nitrogen is stopped after the flow rate of oxygen is raised to reach the normal oxygen supply; and the contents of CO and O2 in smoke are controlled to be beyond the explosion venting range. According to the method, the problem which enables the enterprise to be bothered for a long time that electric precipitation explosion venting occurs during blowing igniting of converter semi-steel steelmaking can be solved in a simple way; the potential risk is removed; the production can be carried out smoothly; a great contribution is brought for the safe and efficient production of semi-steel steelmaking.

Description

technical field [0001] The invention relates to a blowing method for preventing electric dust removal and venting explosion during the blowing stage of semi-steel making under the operation of leaving slag, and belongs to the technical field of converter steel making methods. Background technique [0002] Dry dust removal is a dust removal method applied in steelmaking converters in recent years. Compared with the traditional wet converter dust removal process, it has the advantages of low energy consumption, less land occupation, low operating costs, easy dust recovery and treatment, and improved environment. . Due to the discontinuous production characteristics of converter steelmaking, CO and some O produced in the smelting process 2 It is easy to enter the dust removal system at the same time. Once the two gases are mixed and reach CO>9% and O 2 >6%, it will burn and explode when encountering sparks or open flames. In the electric field, the cathode line of the ...

AI Technical Summary

Problems solved by technology

In addition, when the gun is blown at a low position, the metal droplets hit by the oxygen stream are reflected to the tip of the oxygen gun, which is very easy to burn through, causing the risk of water leakage and posing a major safety hazard

[0004] Chinese Patent No. CN101619375B discloses a method for preventing electric dust removal and venting explosions in top-bottom combined blown converters. It requires that the Si content in molten iron is not less than 0.15%, and it is not suitable for semi-steel after vanadium extraction (Si-3 ~4×10 -3 Or the total amount of slag in the upper furnace is 15% to 40%, which is not applicable when the amount of slag remaining is greater than 50% of the total amount of slag

There is no report on how to prevent the explosion venting method of electric dust removal during the blowing stage of semi-steel making under the condition of large amount of slag remaining