Flexible Profile Bar Screen for Digester Vessel Installation
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Solution Overview
Problem
The installation of profile bar screens in cylindrical digester vessels is time-consuming and costly due to the need for adjusting and replacing numerous support rods, which are not effectively supported on the vessel wall, leading to force stress and potential breakage, especially when replacing slotted screen plates with profiled bar screens.
Innovation Solution
A profile bar screen design featuring vertical profile bars and horizontal support arches with expansion slots that allow flexibility to accommodate deviations in the digester vessel's shape, enabling the support shoulders to rest against the vessel wall and distribute force evenly, reducing the need for a sturdy frame bed and simplifying the installation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If support rods are used to transmit forces to the digester wall, then force transmission is achieved, but the support rods are not effectively supported on the vessel wall due to shape deviations, causing bending and breakage
Solution Approach 1:
The support arches are designed to be flexible rather than rigid, allowing them to adapt to the non-circular shape of the digester vessel. This flexibility enables the support arches to maintain contact with the vessel wall throughout their length, distributing forces evenly and preventing the bending and breakage that occurs with rigid support rods.
Solution Approach 2:
The support structure transitions from rigid rods with fixed geometry to flexible arches that can change their shape parameters to match the vessel wall contour. This parameter change allows the support element to conform to the actual vessel shape, ensuring continuous support and effective force transmission.
2Reliability
If adjustable support rods are used to accommodate vessel shape deviations, then support effectiveness is improved, but installation time and cost increase significantly
Solution Approach 1:
The flexible support arches are designed to automatically adapt to the vessel wall shape without requiring manual adjustment. When installed, the arches naturally conform to the non-circular cross-section of the digester, eliminating the time-consuming adjustment process required for rigid support rods while maintaining effective support.
Solution Approach 2:
The support arches are constructed as flexible structural elements that can bend and adapt to the vessel wall contour. This flexibility allows the arches to self-adjust to the actual vessel shape, providing effective support without requiring time-consuming manual adjustment during installation.
3Strength
If a sturdy frame bed is used to support profile bar screens, then structural strength is achieved, but device complexity and installation cost increase
Solution Approach 1:
The invention extracts and eliminates the complex sturdy frame bed structure by using flexible support arches that directly transmit forces to the digester wall. This removal of the frame bed simplifies the overall device complexity while maintaining structural strength through the flexible arch design.
Solution Approach 2:
The flexible support arches serve multiple functions: they provide structural support, adapt to vessel shape deviations, and transmit forces to the wall. This multi-functionality replaces the need for a separate complex frame bed structure, simplifying the overall system while maintaining strength.
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 design allows for quicker and more efficient installation of profile bar screens, reducing downtime and costs by enabling flexible support that adapts to the vessel's shape, ensuring stable and secure load support without the need for extensive frame bed reconstruction.
Implementation Method 1
horizontal support arches with expansion slots that allow flexibility to accommodate deviations in the digester vessel's shape
Data Source
AI summary
The improved profile bar screen is for draining treatment liquor from a suspension of comminuted cellulose material and treatment liquor in an essentially cylindrical digester vessel. The profile bar screen is designed with horizontal support arches that have expansion slots allowing the otherwise rigid structure of the support arches to flex and adapt to any unevenness of the vessel wall, thus allowing support shoulders to rest against the inside of the vessel wall.