Curved Strainer Wall Structure for Nuclear Cooling Water Filtration
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Solution Overview
Problem
Conventional filter screens in nuclear power plants have a small surface area, leading to increased pressure drop and reduced filtering efficiency due to contamination, and are prone to deformation under high pressure, resulting in high installation costs and economical issues.
Innovation Solution
A strainer wall structure with a plurality of curved sections, including a first filter plate with alternately bent sections and a second filter plate with a dual wall structure, providing a larger effective filtering area and reducing flow resistance, while allowing for easy maintenance and installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional flat filter screen is used, then the structure is simple, but the filtering area per unit volume is small and pressure drop is high
Solution Approach 1:
The filter screen is transformed from a flat structure to a curved cylindrical structure. The curved surface increases the filtering area per unit volume while maintaining structural simplicity. The curvature allows the filter to expand the effective filtering surface without increasing the axial length of the apparatus.
Solution Approach 2:
The filter screen utilizes the radial dimension by curving the screen surface into a cylinder, rather than only using the axial and transverse dimensions of a flat screen. This dimensional transformation increases the filtering area within the same volume constraint.
2Reliability
If the screen surface is contaminated with fiber settlings, then filtering is performed, but pressure drop increases to an unallowable level
Solution Approach 1:
Multiple filter screens are arranged in parallel within the same apparatus, allowing the system to provide both filtering function and reduced pressure drop. The parallel arrangement increases total filtering area, distributing the flow and reducing pressure drop while maintaining reliable foreign substance removal.
3Area of stationary object
If the number of filtering apparatus is increased to increase filtering area, then filtering efficiency improves, but installation cost increases
Solution Approach 1:
Multiple filter screens are merged into a single integrated apparatus structure. The curved screens are arranged concentrically or in parallel within one housing, achieving the effect of multiple filtering apparatus while using a single installation unit, thereby reducing installation cost and complexity.
4Device complexity
If a single surface filter is used, then the structure is simple, but the filter is easily deformed by high pressure
Solution Approach 1:
The filter system is segmented into multiple parallel filter screens rather than relying on a single thick screen. This segmentation distributes the pressure load across multiple surfaces, increasing overall pressure resistance while maintaining structural simplicity of each individual screen.
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 strainer wall structure significantly increases the filtering area per unit volume, reduces pressure drop, and distributes load pressure effectively, enhancing structural integrity and reducing installation costs.
Implementation Method 1
a pressure drop due to the foreign substances must be guaranteed not to exceed an allowable critical value
Implementation Method 2
reducing foreign substances covering a suction surface and a flow resistance of the foreign substances
Implementation Method 3
a first filter plate inserted into the body and including a plurality of curved sections formed by alternately bending a first punched plate having a plurality of filtering holes
Data Source
AI summary
A strainer wall structure includes curved sections, a method of manufacturing the same, and a filtering method using the strainer wall structure to provide a substantially larger effective filtering area in the same length and width, substantially reducing foreign substances covering a suction surface and flow resistance of the foreign substances, and reducing pressure drop at a cooling water pass corresponding thereto. The strainer wall structure includes an inlet side through which cooling water is introduced and an outlet side through which the filtered cooling water is discharged, includes a body having openings in directions of the inlet side and the outlet side, and a first filter plate inserted into the body and including curved sections formed by alternately bending a first punched plate having filtering holes in opposite directions and at a predetermined interval.