Continuous Casting Line Rate Balancing for Steel Production
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Solution Overview
Problem
Existing metal elongated product production systems are vulnerable to complete shutdowns due to issues in the rolling mill or casting lines, as they require synchronized operation across multiple lines, leading to production losses and increased failure risks.
Innovation Solution
A method involving a steelmaking station, a rolling mill, and a continuous casting station with at least two casting lines, where the production rates of the lines can be dynamically adjusted using varying means, such as valves and induction furnaces, to maintain production continuity even if a problem occurs on one line, allowing the second line to compensate for variations in the first line's production rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple casting lines are directly aligned with and feed the rolling mill to maximize production rate, then productivity increases, but reliability decreases because a problem in any line causes complete production shutdown
Solution Approach 1:
The system segments the casting lines into two functional groups: direct feeding lines that supply the rolling mill and indirect feeding lines that bypass it. This segmentation allows independent operation of different line types, so that problems in direct feeding lines do not necessarily halt indirect feeding lines, and vice versa, thereby maintaining production continuity while preserving high productivity.
Solution Approach 2:
Indirect feeding lines act as intermediary pathways that bypass the rolling mill. When the rolling mill or direct feeding lines experience problems, these intermediary lines can continue operating and supply the rolling mill indirectly, or supply other processing lines, thus preventing complete production shutdown and improving system reliability.
2Productivity
If transfer devices are added to synchronize motion of billets from multiple casting lines to the rolling mill, then productivity is maintained, but device complexity increases and reliability decreases due to additional failure risks
Solution Approach 1:
Casting lines are designed with multi-functionality: they can operate in direct feeding mode (aligned with rolling mill) or indirect feeding mode (bypassing the rolling mill). This universal capability eliminates the need for complex transfer devices to switch between modes, as each line can independently select its feeding path based on operational requirements, thereby reducing device complexity while maintaining productivity.
Solution Approach 2:
The system dynamically adjusts which casting lines feed the rolling mill directly and which feed indirectly based on real-time operational conditions. This dynamic configuration allows the system to optimize productivity without requiring physical transfer devices, as the feeding relationships are flexibly managed through control systems rather than mechanical switching mechanisms.
3Productivity
If all casting lines are directly aligned with the rolling mill to maximize production rate, then productivity increases, but adaptability decreases because the system cannot handle problems or maintenance on any line
Solution Approach 1:
The casting line system is segmented into direct feeding lines and indirect feeding lines with distinct functional roles. This segmentation provides adaptability: when problems occur in direct feeding lines, indirect feeding lines can take over to maintain production, and vice versa. The segmented architecture allows flexible reconfiguration of feeding paths based on operational needs, maintaining both high productivity and system adaptability.
Solution Approach 2:
Indirect feeding lines are prepared in advance as backup pathways. Before problems occur in direct feeding lines, the indirect lines are already positioned and configured to provide alternative feeding routes. This preliminary preparation ensures that when issues arise, the system can quickly switch to indirect feeding without disruption, enhancing adaptability while maintaining productivity.
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 continuous production by balancing production rates between the steelmaking station and the rolling mill, allowing the system to maintain output even if issues arise on one line, reducing downtime and optimizing production efficiency.
Implementation Method 1
means (15) to homogenize the temperature of the intermediate product coming from the first casting line, said means being located between the caster and the rolling mill, such as an induction furnace
Data Source
Figure 1
AI summary
Apparatus for production of elongated rolled products comprising: - means (6) for producing liquid metal having at a first production rate, - a rolling mill (13) having a second production rate - a continuous casting station (11) located between the steelmaking station and the rolling mill (13), the continuous casting station (11) comprising at least two casting lines (21,19), each line being operable to produce elongated intermediate products, wherein: ■ a first casting line is directly aligned with (or is configured to directly feed) the rolling mill to feed the roll mill with casted product, and ■ at least a second laterally not aligned with the rolling mill and not feeding the rolling mill characterised in that the apparatus further comprises: varying means (27) for varying simultaneously the production rate of the first casting line and the production of at least a second casting line depending on the difference between the steelmaking station production and the rolling mill production.