Converter CO2-O2 Injection for Fire Point Temperature Control
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Solution Overview
Problem
The steel industry faces challenges in dynamically controlling the fire point area temperature during the converter smelting process, leading to increased CO2 emissions, environmental pollution, heat loss, and reduced metal yield, with no effective method for continuous monitoring or dynamic adjustment of this temperature.
Innovation Solution
A method involving the installation of an infrared thermometer inside an oxygen lance connected to a data processing system, which dynamically adjusts the CO2 and O2 flow rates based on real-time temperature measurements to control the fire point area temperature and molten pool heating rate, optimizing energy use and reducing smoke and dust production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed oxygen jet is used to create high-temperature fire point area, then smelting efficiency is improved, but smoke and dust production increases and metal yield decreases
Solution Approach 1:
The patent converts the harmful high-temperature fire point area into a beneficial cooling zone by injecting CO2. The endothermic reaction between CO2 and carbon absorbs excess heat, reducing smoke and dust production while maintaining smelting efficiency. The harmful thermal energy is transformed into a useful cooling mechanism.
Solution Approach 2:
The patent changes the temperature parameter of the fire point area by dynamically adjusting the CO2 injection amount. By controlling the CO2 mixing ratio and injection flow rate, the fire point temperature is optimized to reduce harmful emissions while preserving productive smelting reactions.
2Speed
If high-temperature fire point area is maintained, then smelting speed is improved, but heat loss increases and energy utilization decreases
Solution Approach 1:
The patent dynamically adjusts the fire point temperature parameter through CO2 injection to optimize the balance between smelting speed and heat loss. By controlling temperature within an optimal range rather than maintaining maximum temperature, energy utilization is improved while preserving productive smelting rate.
Solution Approach 2:
The patent converts excessive thermal energy, which would otherwise be wasted as heat loss, into a controlled cooling mechanism through CO2 injection. The endothermic reaction absorbs surplus heat, converting harmful thermal energy loss into a useful temperature control mechanism that maintains optimal smelting conditions.
3Temperature
If CO2 injection amount is increased to cool the fire point area, then temperature control is improved, but smelting process complexity increases
Solution Approach 1:
The patent implements a feedback control system where the CO2 injection amount is dynamically adjusted based on real-time monitoring of fire point temperature and smelting stage. This automated feedback mechanism simplifies operation by eliminating manual intervention while achieving precise temperature control, effectively reducing operational complexity despite adding control systems.
Solution Approach 2:
The patent transitions from static CO2 injection to dynamic injection where the CO2 flow rate and mixing ratio are continuously adjusted according to smelting stage and temperature conditions. This dynamic approach optimizes temperature control efficiency while the automated control system manages the complexity of variable parameters.
4Device complexity
If traditional smelting method is used without temperature monitoring, then equipment simplicity is maintained, but metal yield and energy utilization decrease
Solution Approach 1:
The patent introduces temperature monitoring and feedback control to optimize smelting parameters for improved metal yield. The feedback system automatically adjusts CO2 injection based on temperature measurements, eliminating the need for complex manual operation while achieving superior productivity and energy utilization compared to traditional methods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables precise control of the fire point area temperature, enhancing energy efficiency, reducing emissions and material consumption, and improving metal yield by dynamically adjusting the CO2 mixing ratio in real-time.
Implementation Method 1
an infrared thermometer is installed inside an oxygen lance. The infrared thermometer is connected to a data processing system
Implementation Method 2
The reaction between CO2 and [C] is an endothermic reaction (which is mainly limited by the temperature and concentration of [C]), and generates 1.2-2 times of CO bubbles, which may not only reduce the temperature of the fire point area
Data Source
AI summary
The present disclosure provides a converter CO2—O2 mixed injection smelting method and a fire point area temperature dynamic control method. The method realizes online monitoring through an infrared temperature sensor installed inside an oxygen lance, dynamically adjusts the mixing ratio of CO2 and O2 and the height of the oxygen lance position according to the fire point area temperature changes and process requirements in different smelting stages, so that the secondary smelting system interlockingly and dynamically controls the fire point area temperature and the molten pool heating rate.