Dynamic temperature control method for converter CO2-O2 mixed injecting and smelting fire point region

Abstract

The invention provides a dynamic temperature control method for a converter CO2-O2 mixed injecting and smelting fire point region, and belongs to the technical field of steel smelting. The method comprises the following steps: realizing online monitoring through an infrared temperature sensor mounted inside an oxygen lance, transmitting a digital signal converted by a monitoring system to a smelting secondary system, dynamically regulating a CO2 and O2 mixing proportion and lance position height of the oxygen lance according to temperature changes and process requirements of the fire point region at different smelting periods by the smelting secondary system, thereby realizing interlocking and dynamically controlling the temperature of the fire point region and a heat-up rate of a molten pool by the smelting secondary system. The dynamic temperature control method is suitable for 30-400t converter CO2-O2 mixed injecting and smelting, dynamically regulates the temperature of the fire point region and the heat-up rate of the molten pool according to the process requirements, and realizes increasing of an effective heat utilization rate of the molten pool, reducing of steel-making soot discharge amount, reducing of furnace slag generation amount and reducing of steel material consumption.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a converter CO 2 -O 2 A method for dynamic control of temperature in the ignition zone of mixed injection smelting. Background technique [0002] CO 2 A large amount of emission is the main cause of the greenhouse effect, and every ton of steel produced will emit about 2 tons of CO 2 , CO 2 Efficient utilization of is of great significance for reducing greenhouse gas emissions. Therefore, developing new technologies and exploring new ways to achieve CO2 emissions in the steel industry 2 The reduction or consumption of emissions seems urgent. [0003] During the converter smelting process, the high-speed oxygen jet is in contact with the molten pool, forming a high-temperature fire point area where iron evaporates, generating a large amount of smoke and dust, causing environmental pollution, increasing the heat loss of the converter, and reducing the metal y...

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Problems solved by technology

[0005] Chinese patent CN 200910088822.9 discloses a CO injection 2 A method for controlling the temperature of the molten pool in converter steelmaking by using gas to control CO 2 Mix to O 2 , according to different periods of smelting, adjust CO 2 The mixing ratio, to achieve the purpose of controlling the temperature of the converter steelmaking bath, but the method of CO 2 The proportional adjustment adopts a static model and is realized by manual adjustment. It is not a real-time dynamic adjustment, and it is difficult to effectively use CO 2 or the most efficient use of CO 2

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