Hybrid Thermal Treatment Line for Flexible Metal Pre-Product Heating
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Solution Overview
Problem
Existing thermal treatment processes in metal rolling mills, such as gas-fired reheating furnaces and induction furnaces, face limitations in flexibility, efficiency, and environmental emissions, leading to high costs and maintenance issues.
Innovation Solution
A flexible thermal treatment line with multiple heating devices, transport devices, and a control system that allows for the flexible handling of hot or cold metal pre-products, optimizing energy use and reducing emissions through a combination of gas and induction heating, along with a higher-level control system for managing material flow and thermal treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If gas-powered reheating furnaces are used for thermal treatment, then metal pre-products can be heated to process temperature, but unwanted emissions (CO, CO2, NOx) are generated and fossil fuel consumption increases
Solution Approach 1:
The thermal treatment process is divided into multiple heating devices with different functions: a first heating device for preheating and a second heating device (induction furnace) for final heating to rolling temperature. This segmentation allows the system to achieve the desired temperature while reducing emissions by using induction heating for the most temperature-critical phase.
Solution Approach 2:
The patent replaces the conventional gas-powered heating system with a hybrid system that uses induction heating (electromagnetic field-based) for the second heating device. This substitution eliminates direct combustion emissions during the final heating phase, addressing the harmful emissions problem while maintaining effective thermal treatment.
2Adaptability or versatility
If gas-powered preheating furnaces are frequently ramped up and down, then the furnace can adapt to varying production demands, but service life of the brick lining is reduced and maintenance costs increase
Solution Approach 1:
The system employs a dynamic, multi-device heating configuration where the first and second heating devices can be selectively activated based on production requirements. This dynamic arrangement allows the furnace to adapt to varying demands without requiring frequent ramping of a single gas-powered furnace, thereby preserving the brick lining and extending service life.
Solution Approach 2:
The hybrid heating system provides multi-functionality by combining a gas-powered first heating device with an induction-powered second heating device. This universal system can handle various production scenarios (different temperatures, throughputs, and material types) without requiring frequent adjustments to a single furnace, reducing thermal stress on the brick lining.
3Speed
If induction furnaces are used for heating to rolling temperature, then heating speed is improved, but the system is limited to small formats and cannot handle large metal pre-products
Solution Approach 1:
The heating process is segmented into two stages: the first heating device (gas-powered) handles the bulk heating of large metal pre-products, while the second heating device (induction furnace) provides rapid final heating. This segmentation allows large formats to be processed effectively by combining the advantages of both heating methods.
Solution Approach 2:
The patent merges two different heating technologies (gas-powered heating and induction heating) into a hybrid system. The first heating device prepares the material by raising its temperature, and the second heating device delivers rapid induction heating to reach rolling temperature. This combination overcomes the size limitation of pure induction systems while maintaining high heating speed benefits.
4Ease of operation
If a single heating route is used for thermal treatment, then the process is simple to operate, but flexibility to respond to malfunctions is limited
Solution Approach 1:
The control system dynamically selects and configures heating routes based on real-time production conditions, material characteristics, and equipment status. This dynamic routing capability maintains operational simplicity through automated decision-making while providing flexibility to respond to malfunctions by alternative paths through the first and second heating devices.
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
Enhances operational flexibility, reduces emissions and production costs, and optimizes energy consumption by allowing for adaptive thermal treatment processes in response to mill malfunctions or material variations.
Implementation Method 1
at least one first heating device for thermal treatment of the metal pre-product
Implementation Method 2
Continuous induction furnaces are used for raising the temperature to the required rolling temperature for small-format primary material, what is known as billets
Data Source
AI summary
A process for operating a thermal treatment line for the flexible thermal treatment of metal pre-products, a thermal treatment line configured and suitable for carrying out the process, and a casting-rolling mill and a process for operating a casting-rolling mill having a thermal treatment line are disclosed. In comparison with previous thermal treatment lines and processes for operating said thermal treatment lines, the disclosed thermal treatment line allows flexible operation. Emissions and production costs in the process are thereby reduced.