Grit Removal System Using Diffusion Baffles and Airlift Pump
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current grit removal systems, such as Vortex and chain and bucket designs, are inefficient in removing finer grit particles like 100 and 150 mesh due to mechanical wear issues and require large tank volumes, leading to increased maintenance and capital costs, especially during storm flows and varying flow conditions.
Innovation Solution
A grit removal system with a tank design featuring an inlet diffusion baffle assembly and an outlet baffle assembly that uses air flow patterns to reduce fluid velocity and promote settling, eliminating the need for submerged mechanical equipment and large tank volumes, utilizing an airlift pump for efficient grit removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Vortex grit separation systems are used to handle larger flows, then the system can operate continuously during storm events and routine daily flows, but the system is not efficient in removing finer grit particles (100 and 150 mesh) and loses efficiency rapidly under extreme flow rate variations
Solution Approach 1:
The system segments the flow handling into two distinct paths: a Vortex separator handles routine daily flows continuously, while a separate cyclonic separator handles storm flow events. This segmentation allows each component to be optimized for its specific operating conditions, with the cyclonic separator providing high efficiency for finer particles during high-flow events without compromising the continuous operation capability.
Solution Approach 2:
The system dynamically switches between different separation mechanisms based on flow conditions. During routine flows, the Vortex separator operates continuously; during storm events with extreme flow rate variations, the cyclonic separator is activated to maintain high removal efficiency for finer grit particles that the Vortex system cannot effectively remove under varying conditions.
2Manufacturing precision
If chain and bucket designs are used to handle 65-mesh requirements, then the system can remove larger grit particles, but the mechanical components (buckets, chains, bearings) are subject to wear and require maintenance
Solution Approach 1:
The invention replaces the mechanical chain and bucket system with a cyclonic separator that uses centrifugal force generated by rotating flow to separate grit particles. This substitution eliminates submerged mechanical components subject to abrasive wear, achieving 65-mesh removal capability through fluid dynamics rather than mechanical scraping or lifting actions.
Solution Approach 2:
The system uses hydraulic and pneumatic principles through the cyclonic separator, where pressurized air and water create a rotating flow pattern that generates centrifugal force for particle separation. This pneumatic-hydraulic approach replaces the mechanical chain-bucket mechanism, eliminating wear-prone components while maintaining effective grit removal.
3Difficulty of detecting and measuring
If large tank volumes are used to allow enough detention time for separation of very small grit particles, then the system can remove 100-mesh or 150-mesh particles, but the capital costs increase
Solution Approach 1:
The cyclonic separator induces rapid rotational motion (centrifugal effect) in the flow stream, creating intense mixing and separation forces that equivalent to many times the gravitational field. This mechanical vibration and rotation allow very small grit particles (100-mesh or 150-mesh) to be separated in seconds rather than requiring hours of detention time in large tanks, dramatically reducing the required tank volume while maintaining high removal efficiency.
Solution Approach 2:
The system changes the separation parameter from gravitational settling (which requires large volumes and long detention times) to centrifugal separation (which achieves rapid separation in compact volumes). By transforming the separation mechanism and changing the dominant physical parameter from gravity to centrifugal force, the system achieves high removal efficiency for fine particles without requiring large tank volumes.
4Difficulty of detecting and measuring
If screw conveyors are run at very slow speeds to handle finer mesh particles, then the system can remove 100-mesh or 150-mesh particles, but the overall capacity is reduced
Solution Approach 1:
The cyclonic separator uses rapid rotational motion to separate finer mesh particles from the flow stream in a matter of seconds. This intense mechanical vibration and centrifugal action achieves high removal efficiency for 100-mesh or 150-mesh particles without the need for slow conveyor speeds, thereby maintaining high overall grit removal capacity while effectively handling fine particles.
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 system achieves high efficiency in removing finer grit particles without extensive mechanical components, reducing maintenance and capital costs, and maintaining performance across varying flow conditions, with improved grit settlement and reduced short-circuiting.
Implementation Method 1
uses air flow patterns to reduce fluid velocity and promote settling
Implementation Method 2
promote settling
Implementation Method 3
utilizing an airlift pump for efficient grit removal
Data Source
AI summary
An assembly for removing grit particles from a fluid having a flow. The assembly includes a tank having walls for holding fluid for separation of grit particles from the fluid, a fluid inlet for flow of fluid into the tank, a fluid outlet for flow of fluid from the tank, an inlet diffusion baffle assembly including a baffle positioned to direct fluid flow toward the tank walls and a lower chamber of the tank, and an outlet baffle assembly including a baffle positioned in a rear of the tank at an upward slope from the center of the tank toward the fluid outlet configured to direct fluid flow toward the center of the tank.