Hopper Dredger Filter Overflow Captures Fine Particles
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Solution Overview
Problem
Trailing suction hopper dredgers face reduced load capacity when dredging fine particles due to slow settling, leading to increased environmental impact from suspended particles in the overflow plume.
Innovation Solution
An overflow system with a filtering device comprising pleated mesh layers and rinsing nozzles, which captures and recirculates suspended particles back to the hopper, reducing turbidity and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If an overflow system is used to drain head water, then load capacity is improved, but suspended particles in the overflow create environmental harm through plume formation
Solution Approach 1:
A filtering device is introduced as an intermediary between the overflow system and the environment. The filter captures suspended particles from the overflow water before discharge, preventing plume formation while maintaining the load capacity benefits of the overflow system
Solution Approach 2:
The filtering device converts the harmful suspended particles in the overflow into a beneficial resource by collecting them for potential reuse or proper disposal, transforming the environmental problem into a solution
2Object-affected harmful factors
If overflow systems are not used when dredging fine particles, then environmental impact is reduced, but load capacity decreases
Solution Approach 1:
The filtering device serves as a mediator that enables the use of overflow systems for fine particle dredging by capturing suspended particles before discharge, thus allowing load capacity improvement without increasing environmental impact
3Object-affected harmful factors
If a filtering device is added to the overflow system, then environmental impact is reduced by capturing suspended particles, but device complexity increases
Solution Approach 1:
The filtering device utilizes porous filtering materials that passively capture suspended particles through physical filtration. This approach reduces system complexity by relying on the inherent properties of porous materials rather than complex active filtration mechanisms
Solution Approach 2:
The filtering device is designed to operate passively using the natural flow of overflow water, requiring minimal external energy input or complex control systems. The system serves itself by utilizing the existing hydraulic conditions to drive the filtration process
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
Enhances load capacity by filtering fine particles and reduces environmental impact by minimizing the plume generated during dredging operations, allowing for efficient handling of fine materials.
Implementation Method 1
a filtering device and wherein said fractions outlet is coupled with said filtering device downstream from at least one filtering layer
Implementation Method 2
the means for rinsing the fractions from the filtering device comprises at least one nozzle. Optionally, the at least one nozzle can rinse the fractions with a pulsating spray
Implementation Method 3
the filtering device comprises means for vibrating at least one mesh layer
Implementation Method 4
The mixture is reduced in speed when in the dredger hopper, and this speed reduction allows for the settling of components suspended in the mixture
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
An overflow system includes an inlet for taking in head water; a filtering device, fluidly coupled with the inlet, for separating suspended fractions from the head water; a fractions outlet coupled with the filtering device for transport of the fractions away from the overflow system; and a fluid outlet for draining water from the overflow system.