Oxygen Arc Furnace Steelmaking Method with Proper Carbon Distribution and Large Power Consumption Control

Abstract

The invention discloses an oxygen electric arc furnace steelmaking method for control of large electricity consumption with proper carbon proportion and belongs to the technical field of smelting. The smelting method is achieved by the following steps: properly proportioning carbon; delivering electricity at high power; delaying the initial oxygen consumption chance; controlling a proper oxygen supply; controlling proper slag components; controlling carbon spray amounts in different smelting periods; and controlling the temperature of a lot of fluid sludge and relatively high finish point carbon content. The steel yield can be effectively improved, the oxygen consumption and the carbon powder consumption are reduced, the power consumption is properly improved, the finish point carbon content is improved, the consumption of a desoxidant is reduced and the smelting period is shortened, so that the comprehensive cost is lowered. The furnace and the machine are matched, the rhythm of production is stable and production organization coordination and quality control are conveniently carried out. The smelting method can be used for guaranteeing that the average yield of the electric-arc furnace is stabilized over 93.5%, the average oxygen consumption per ton is about 25Nm<3> and the average power consumption per ton is about 420Kwh.

Description

technical field [0001] The invention belongs to the technical field of electric arc furnace steelmaking. Background technique [0002] With the increasing shortage of energy and resources in the world, the metallurgical industry pays more and more attention to the recycling of non-renewable resources such as coal and ore. Metallurgical enterprises are high-energy-consuming enterprises, and their energy consumption accounts for about 10% of the national energy consumption and 15.25% of the industrial sector's energy consumption. As a sustainable metallurgical model of circular economy, electric arc furnace steelmaking has been recognized by the world metallurgical industry. Since the beginning of the new century, the proportion of electric arc furnace steelmaking in developed countries has continued to increase year by year. As a big steel country, my country's electric arc furnace steel output has reached 50 million tons per year. [0003] At present, electric arc furnace ...

AI Technical Summary

Problems solved by technology

[0004] Under the condition of lack of molten iron, all solid charge (scrap steel + pig iron) is used for smelting. In the early stage, the oxygen-substituted electricity smelting technology with high carbon distribution, small electricity consumption and large oxygen consumption was also carried out, such as the technical scheme in the patent CN102021269B. Under this smelting technology condition, the comprehensive cost per ton of steel is high and the matching of furnace and machine is not good, which is not conducive to the organization and quality control of production

[0005] In the oxygen-substituting electric smelting technology that achieves high carbon allocation, small electricity consumption and large oxygen consumption, there are defects such as low iron and steel material yield, high oxygen consumption, large amount of carbon injection, and long smelting cycle. The specific consumption indicators are as follows: Carbon powder consumption per ton of steel reaches 8kg / t steel; iron and steel material consumption is 1130kg / t steel; electric furnace power consumption per ton steel is 330kwh / t steel; oxygen consumption per ton steel is 45m 3； The average smelting cycle of the electric furnace is 65-70min; the carbon at the end of the electric furnace is less than 0.07%, accounting for more than 60%, and the amount of deoxidizer is large; the comprehensive cost per ton of steel is high

Images