Steel Sheet Pickling Ultrafiltration Unit Clogging Reduction
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Solution Overview
Problem
Existing methods for purifying pickling solutions in steel sheet pickling processes require large installations due to voluminous equipment and fail to effectively protect recirculating circuits from clogging, leading to frequent shutdowns and space inefficiency.
Innovation Solution
A method involving a treatment unit with a recirculation tank, ultrafiltration device, and continuous flow management, where the pickling solution is directly fed into an ultrafiltration device without a storage tank, using cross-flow ultrafiltration and backwashing to minimize clogging and reduce installation footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional purification methods with settling tanks and multiple filtration systems are used, then silicon removal efficiency is improved, but installation footprint increases significantly
Solution Approach 1:
The patent combines multiple purification functions (settling, microfiltration, ultrafiltration) into a single integrated ultrafiltration device that performs all separation operations in one unit, eliminating the need for separate settling tanks and multiple filtration systems while maintaining high silicon removal efficiency
Solution Approach 2:
The ultrafiltration device serves multiple functions simultaneously: it acts as both a settling tank and a filtration system, performing solid-liquid separation and silicon removal in a single device that handles all purification requirements
2Object-generated harmful factors
If conventional purification equipment is installed, then silicon precipitation is removed, but recirculating circuits remain vulnerable to clogging
Solution Approach 1:
The patent implements continuous ultrafiltration of the pickling solution as it circulates, ensuring that silicon precipitation is continuously removed throughout the recirculation process rather than in discrete batches, which maintains constant protection against clogging in the recirculating circuits
Solution Approach 2:
The ultrafiltration membrane acts as an intermediary barrier that selectively removes silicon-containing precipitates from the pickling solution while allowing the solution to continue circulating, protecting downstream equipment from clogging without interrupting the pickling process
3Ease of operation
If storage tanks are used for pickling solution, then solution management is simplified, but space requirements and clogging risk increase
Solution Approach 1:
The patent extracts the storage function entirely from the system by implementing continuous circulation and purification without any storage tanks, eliminating the space required for tank storage while maintaining proper solution management through continuous processing
Solution Approach 2:
The system performs preliminary purification of the pickling solution before it can precipitate silicon, continuously treating the solution as it circulates to prevent precipitation issues that would otherwise require large storage tanks for management
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 slows down clogging in recirculating systems, reduces membrane fouling, and achieves a significant reduction in space requirements while maintaining high silicon removal efficiency, prolonging the lifespan of equipment and optimizing acid circulation.
Implementation Method 1
a continuous entering flow of said solution being fed into an ultrafiltration device from the recirculation tank and two flows exiting the ultrafiltration device, one filtered exiting flow being then fed back inside said recirculation tank
Implementation Method 2
using cross-flow ultrafiltration and backwashing to minimize clogging and reduce installation footprint
Data Source
AI summary
The invention relates to a method for pickling steel sheets 8, the steel sheets being continuously dipped in a pickling bath 1, containing a pickling solution 10, the bath being connected to a treatment unit including a recirculation tank 3, circulators 12 and 13, a continuous entering flow 11 of the solution being fed into an ultrafiltration device 2 from the recirculation tank 3 and two flows exiting the ultrafiltration device, one filtered exiting flow 21 being then fed back inside the recirculation tank 3 and one unfiltered flow 22, the treatment unit including no storage tank.