Segmented Nozzle Control for Continuous Casting Cooling
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Solution Overview
Problem
Conventional secondary cooling apparatuses in continuous metal casting machines have limited adjustment range for water flow rates, leading to unstable cooling and high energy consumption, as they cannot optimize energy use across varying cooling needs.
Innovation Solution
The method involves activating individual delivery orifices of nozzles in a secondary cooling apparatus to precisely control the flow rate of refrigerant fluid, allowing for flexible adjustment according to the metal product's needs, using multiple orifices and potentially different refrigerant fluids, and independent control of cooling units to minimize energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional nozzles use only water or water-air mixture with fixed pressure, then the cooling function is provided, but the adjustment range of water flow rate is limited and energy consumption increases
Solution Approach 1:
The nozzle is divided into multiple independently controllable orifices (first, second, third orifices) instead of a single fixed nozzle. Each orifice can be selectively activated to deliver water at different flow rates, enabling precise adjustment of total water flow rate to match varying cooling demands, thereby improving adaptability while reducing energy consumption by activating only necessary orifices.
Solution Approach 2:
The cooling system transitions from a static fixed-pressure water delivery system to a dynamic system where water flow rate is continuously adjustable through selective activation of multiple orifices. The control unit dynamically activates specific orifices based on real-time cooling requirements, allowing the system to adapt to varying thermal conditions along the metal product casting process.
2Temperature
If water flow rate is increased to meet higher cooling demands, then cooling effectiveness improves, but pressure drops increase and energy consumption rises
Solution Approach 1:
By segmenting the water delivery system into multiple orifices with individually controllable flow rates, the system can achieve the required cooling effectiveness by activating only the necessary number of orifices at appropriate flow rates, rather than increasing flow rate across all orifices. This segmentation allows precise matching of water flow to actual cooling needs, reducing unnecessary pressure drops and energy loss.
Solution Approach 2:
The system changes the parameter of water flow rate delivery by using multiple orifices with different flow rate capabilities. Instead of a single high-flow orifice operating at high pressure drops, the system uses multiple lower-flow orifices that can be selectively activated, maintaining cooling effectiveness while operating at lower pressure drops and reducing energy loss.
3Adaptability or versatility
If conventional nozzles deliver continuous water flow, then cooling function is provided, but the system cannot adapt to punctual cooling needs along the roller path
Solution Approach 1:
The nozzle is segmented into multiple orifices that can be independently controlled, allowing different sections of the nozzle to serve different cooling zones along the roller path. This segmentation enables the system to deliver water flow rate precisely where and when needed, adapting to punctual cooling requirements of the metal product at different positions during casting.
Solution Approach 2:
The multi-orifice nozzle structure serves multiple functions: it can deliver water at various flow rates, activate different orifices for different cooling zones, and adjust to varying cooling demands along the roller path. This multi-functionality allows a single nozzle assembly to handle diverse cooling scenarios, improving adaptability without proportionally increasing overall system complexity.
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 the adjustment range of nozzles, ensures uniform cooling, and reduces energy consumption by optimizing the flow rate and pressure drops within the cooling apparatus, adapting to the metal product's specific cooling requirements.
Implementation Method 1
Convection, which in these types of applications occurs in a forced manner, is determined by the delivery, on the metal product to be cooled, of one or more cooling fluids, possibly also a mixture thereof.
Implementation Method 2
Irradiation is a heat exchange mechanism that occurs between two surfaces at different temperatures, for example between the surface of the metal product and the surfaces of the rollers for supporting and guiding the latter.
Implementation Method 3
The controlled removal of heat from the cast metal product initially occurs through heat exchange by means of a primary cooling apparatus. The primary cooling apparatus comprises a plurality of cooling channels associated or integrated with the containing walls of the mold (crystallizer).
Data Source
AI summary
A method to control a secondary cooling apparatus in a machine for continuous casting of metal products is provided. The secondary cooling apparatus includes a plurality of cooling units equipped with nozzles, each nozzle is provided with delivery orifices from which a refrigerant fluid is delivered, on each occasion according to the punctual cooling needs, toward a metal product.