Pickling Device Acid Level Control for Over-Pickling Prevention
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Solution Overview
Problem
In pickling devices, temporary stops in steel strip travel for maintenance lead to over-pickling and increased switching time between pickling operations, as existing solutions require large lifting devices or separate acid solution tanks that inefficiently heat the acid solution during pauses.
Innovation Solution
A pickling device with a pickling tank, acid-solution storage tank, acid-solution circulation unit, and a guide plate that circulates acid solution to heat exchangers within the tank, maintaining the acid solution at a level below the steel strip's travel height during pauses to prevent over-pickling and efficiently heat the solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the steel strip is lifted above the acid solution during pickling pause, then over-pickling is prevented, but the lifting device becomes large and expensive
Solution Approach 1:
Instead of lifting the steel strip above the acid solution, the invention inverts the approach by lowering the acid solution level below the steel strip's traveling height during pickling pause, thereby preventing over-pickling without requiring complex lifting devices
Solution Approach 2:
The invention extracts the acid solution from the pickling tank during pause and stores it in a separate storage tank, separating the liquid level control function from the steel strip positioning function, thus avoiding the need for large lifting devices
2Reliability
If the acid solution is transferred to a sub tank during pickling pause, then over-pickling is prevented, but the switching time increases and heating efficiency decreases
Solution Approach 1:
The invention performs preliminary heating of the acid solution in the storage tank before it is needed, so that when the steel strip returns to the pickling tank, the acid solution is already at the required temperature, eliminating waiting time and reducing switching time between operations
3Reliability
If the acid solution is transferred to a sub tank during pickling pause, then over-pickling is prevented, but the apparatus cost increases due to heat exchanger requirements
Solution Approach 1:
The invention makes the storage tank multi-functional by equipping it with both storage capacity and heating capability, allowing it to serve dual purposes of storing acid solution and maintaining its temperature, thereby eliminating the need for separate heat exchangers and reducing apparatus cost
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
Prevents over-pickling during pauses and reduces switching time by efficiently heating the acid solution using heat exchangers within the pickling tank, without the need for large lifting devices or separate tanks.
Implementation Method 1
a heat exchanger (18) that heats the acid solution (L)
Implementation Method 2
an acid-solution circulation device (40) that circulates the acid solution (L) between the pickling tank (10) and the acid-solution storage tank (43)
Data Source
AI summary
To prevent over-pickling during pickling pause, shorten the time required to switch between pickling operation and pickling pause, and heat acid solution efficiently, a pickling device includes: a pickling tank for storing acid solution and for pickling a steel strip by allowing the steel strip to travel therethrough while the steel strip is immersed in the acid solution; a heat exchanger for heating the acid solution in the pickling tank; a circulation tank for storing the acid solution, provided separately from the pickling tank; an acid-solution circulation device configured to circulate the acid solution between the pickling tank and the circulation tank; a control device configured to withdraw the steel strip from the acid solution; and a guide plate disposed in the pickling tank and configured to guide the acid solution circulated in the pickling tank by the acid-solution circulation device to the heat exchanger.