Direct Reduction Plant Control via Common Device
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Solution Overview
Problem
The existing systems for steel production in the electric steel route lack efficient coordination between direct reduction systems and electric melting furnaces, leading to suboptimal metallization processes and increased CO2 emissions.
Innovation Solution
A method is introduced where the direct reduction system and electric melting furnace are coupled via a common control device to manage the degree of metallization continuously, allowing for targeted adaptation of the overall process by adjusting process parameters such as reducing gas flow rate and residence time, thereby optimizing the metallization process and reducing CO2 emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the direct reduction plant operates independently without coordination with the melting furnace, then the direct reduction plant can maintain stable operation, but the overall metallization efficiency of the plant system is suboptimal and CO2 emissions are increased
Solution Approach 1:
The patent merges the control systems of the direct reduction plant and melting furnace into a coordinated plant system. The control unit receives process data from both facilities and adjusts operating parameters (such as reducing gas flow rate in the direct reduction plant and power input in the melting furnace) to optimize overall metallization efficiency and minimize CO2 emissions, rather than controlling each facility independently
2Productivity
If the metallization degree in the direct reduction plant is increased to reduce the burden on the melting furnace, then less remelting is required, but the direct reduction plant requires more energy and produces more CO2 emissions
Solution Approach 1:
The control unit dynamically adjusts operating parameters of both facilities based on real-time process data. It optimizes the metallization degree in the direct reduction plant by changing parameters such as reducing gas flow rate, residence time, and temperature, while coordinating with the melting furnace parameters to achieve the best overall balance between productivity and CO2 emissions
3Stability of the object's composition
If the plant system operates without real-time monitoring and adjustment, then the system is simpler to operate, but process stability and optimization are compromised
Solution Approach 1:
The control unit implements a feedback mechanism by continuously receiving process data from both the direct reduction plant and melting furnace, evaluating the overall plant system performance, and automatically adjusting operating parameters to maintain optimal metallization efficiency and CO2 emission levels, thereby ensuring process stability through real-time monitoring and adjustment
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 enhances process stability and efficiency by dividing reduction work between the direct reduction system and melting furnace, allowing for real-time adjustments based on sensor-determined product properties, ultimately minimizing CO2 emissions and improving product quality.
Implementation Method 1
The production of sponge iron is based on the principle of reducing iron ore by exposing it to reducing gas, whereby the Fe compounds present in the iron ore, especially Fe-O compounds, are broken down by reduction, leaving metallic iron as a result of this metallization
Implementation Method 2
This material is melted in an electrically operated furnace, which could, for example, be an electric arc furnace
Implementation Method 3
a sensor is used to determine a product property, in particular a temperature, a composition, or another product property
Data Source
Figure 1a~2
AI summary
A method for operating a plant system (1) is described, comprising a direct reduction plant (2) with a sluice gate (2') and an electric melting furnace (3). In this method, a product property is determined by means of a sensor (4), and the degree of metallization of the sponge iron in the direct reduction plant (2) is adjusted accordingly. A control device (5) can be used to carry out the method, for example, to control a flow valve (8) via an allocation quantity (7) using the feedback mechanism shown with reference numeral (6), in order to change the degree of metallization by adjusting the flow rate of reducing gas.