Finishing Train Heat Insulation for Hot Strip Temperature Retention
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Solution Overview
Problem
Hot rolling mills face challenges in maintaining strip temperature and rolling force levels due to significant heat loss during the finish rolling process, particularly with short stand spacing where existing thermal insulation solutions are inefficient.
Innovation Solution
The implementation of air blow-off and/or transverse water spray systems integrated with thermal insulation elements between roll stands, utilizing ceramic materials and protective ribs or strips to maximize thermal insulation coverage and uniformity, with the ability to pivot or move insulation elements for optimal positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermal insulation hoods are used between rolling stands, then heat loss is reduced and strip temperature is improved, but device complexity increases due to additional insulation elements and protective structures
Solution Approach 1:
The thermal insulation system is divided into multiple discrete insulation elements (15) positioned between individual rolling stands (2, 3, 4). Each insulation element can be independently installed and adjusted, allowing the system to address heat loss at specific problem areas without requiring complete system-wide insulation, thus managing complexity while improving temperature retention.
Solution Approach 2:
Protective elements (6) are added in the transverse dimension perpendicular to the rolling direction, creating a three-dimensional protective structure around the strip. This adds lateral protection against heat loss and physical damage without significantly increasing the longitudinal footprint between stands, effectively improving insulation without linearly increasing device complexity.
2Reliability
If protective elements are added to shield thermal insulation from band contact, then reliability of thermal insulation is improved, but device complexity and structural complexity increase
Solution Approach 1:
Protective elements (6) such as ribs or bars are pre-installed on the thermal insulation elements (15) before the rolling process begins. These elements act as a first line of defense against potential band contact (ski-up, ski-down, rolling havaries), absorbing or deflecting impacts before they can damage the thermal insulation material, thereby ensuring continuous reliable operation.
Solution Approach 2:
The protective structure combines thermal insulation material with temperature-resistant protective elements (6) to create a composite structure. This composite design allows the system to simultaneously provide thermal insulation and mechanical protection, achieving enhanced reliability without requiring separate independent protection systems that would increase complexity.
3Loss of energy
If thermal insulation coverage is increased to reduce heat loss, then energy efficiency is improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
The insulation elements (15) are designed to be positionable and adjustable rather than fixed permanently. They can be moved along the rolling line and adjusted to optimize coverage based on production conditions, allowing flexible adaptation to different product sizes and rolling configurations without requiring custom-manufactured solutions for each scenario, thereby improving energy efficiency while maintaining ease of manufacture.
Solution Approach 2:
The system allows adjustment of insulation coverage parameters (length, position, density of insulation elements) to optimize heat loss reduction for different production scenarios. By enabling parameter adjustment rather than requiring a fixed maximum-coverage design, the system achieves effective energy conservation while simplifying manufacturing and installation requirements.
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 configuration significantly reduces heat loss, enhances strip temperature retention, and optimizes rolling force levels by maintaining a consistent thermal environment across the width of the rolling stock, even at high product mass flow rates, thereby improving energy efficiency and final rolling temperatures.
Implementation Method 1
thermal insulation hoods are used, which are arranged above or below or next to the warm product
Implementation Method 2
Hot rolling mills face challenges in maintaining strip temperature and rolling force levels due to significant heat loss during the finish rolling process
Implementation Method 3
in the area of at least one thermal stamp an air slap and/or a water crossing is arranged
Implementation Method 4
The at least one protective element can also be cooled
Implementation Method 5
air blow-off and/or transverse water spray systems integrated with thermal insulation elements
Data Source
Figure 1
Figure 2
AI summary
The invention concerns a hot-rolling mill comprising a finishing train (1) for finishing rolling stock, in particular a strip, the finishing train (1) comprising a number of rolling stands (2, 3, 4) which follow one another in a conveying direction (F) of the rolling stock. According to the invention, in order to improve the rolling force level during finishing, there is disposed at least between two rolling stands (2, 3, 4), following one another in the conveying direction (F), at least one heat-insulating element (5) by means of which the rolling stock can be protected from heat losses.