Annular Jet Cooling for Large Cylindrical Shell Temperature Reversion
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Solution Overview
Problem
Existing cooling methods for large-scale cylindrical shells during hot rolling are inadequate in inhibiting internal grain growth and temperature reversion, leading to decreased mechanical properties such as strength, hardness, and toughness due to uneven cooling and high energy consumption.
Innovation Solution
An annular cooling device with inner and outer jet devices arranged along the inner and outer circumference of the cylindrical shell, using a jet cooling method with a wide spray range to ensure timely and uniform cooling, employing multiple sets of jet cooling devices with adjustable hydraulic cylinders to maintain effective heat transfer and water utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional spray cooling units are used for large-scale cylindrical shells, then the cooling process is simple, but the internal grain growth cannot be effectively inhibited and temperature reversion occurs
Solution Approach 1:
The cooling device is segmented into multiple independent spray cooling units arranged along the axial direction of the cylindrical shell. Each unit includes spray nozzles positioned at different locations (top, bottom, and side walls) to provide distributed cooling zones. This segmentation allows different regions of the thick-walled shell to be cooled independently, preventing internal grain growth and temperature reversion while maintaining manageable system complexity
Solution Approach 2:
The cooling system transitions from traditional single-point or single-plane spray cooling to three-dimensional multi-directional spray cooling. Spray nozzles are positioned to cool the top surface, bottom surface, and side walls simultaneously, creating comprehensive cooling coverage in multiple spatial dimensions. This dimensional expansion enables effective heat extraction from the thick wall interior without requiring excessively complex process sequences
2Productivity
If water flow is increased to improve cooling rate, then the cooling effect improves, but water energy consumption increases
Solution Approach 1:
The spray cooling system applies local quality by positioning spray nozzles at specific locations where heat accumulation is most critical - including the top surface, bottom surface, and side walls of the cylindrical shell. Each nozzle is directed to cool specific high-heat zones rather than applying uniform cooling across all surfaces. This targeted approach maximizes cooling efficiency in key areas while minimizing overall water consumption compared to blanket cooling of the entire shell surface
Solution Approach 2:
The cooling system uses partial action by focusing spray cooling on the most critical thermal zones (surfaces and walls most prone to temperature reversion and grain growth) rather than uniformly cooling the entire shell. The spray nozzles are strategically positioned to address only the areas where cooling is most needed, achieving effective temperature control without the excessive water consumption that would result from comprehensive uniform cooling
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
The annular cooling device achieves timely and uniform cooling of large-scale cylindrical shells, effectively inhibiting temperature reversion and maintaining mechanical properties, while reducing energy consumption and ensuring consistent cooling across the shell's length.
Implementation Method 1
each of the inner jet devices and each of the outer jet devices are used to spray cooling medium to an inner wall of the cylindrical shell, and the plurality of outer jet devices are used to spray cooling medium to an outer wall of the cylindrical shell
Implementation Method 2
employing multiple sets of jet cooling devices with adjustable hydraulic cylinders to maintain effective heat transfer
Data Source
AI summary
The present invention discloses an annular cooling device for large-scale cylindrical shell, which comprises a plurality of inner jet devices and outer jet devices; the inner jet devices are arranged inside the cylindrical shell along the inner periphery; the outer jet devices are arranged outside the cylindrical shell along the outer periphery; each inner jet device and each outer jet device are oppositely arranged; the inner jet devices are used for spraying cooling medium to the inner wall of the cylindrical shell; the outer jet devices are used for spraying the cooling medium to the outer wall of the cylindrical shell; and the spray ranges of each inner jet device and each outer jet device in the axial direction of the cylindrical shell are both greater than the length of the cylindrical shell.