Hydrodynamic Separator Flow Control for Stable Sedimentation
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Solution Overview
Problem
Existing hydrodynamic separators face challenges in maintaining optimal sedimentation conditions across varying inlet flow rates, particularly during fluctuations due to weather events like heavy rainfall or droughts, which can disrupt the tangential flow necessary for effective sedimentation.
Innovation Solution
A kit is introduced for constructing hydrodynamic separators with flow straighteners and flow adjustment devices that maintain constant tangential flow velocity by using flow actuators and control elements, such as slides or flaps, to adjust passage areas based on fill levels, ensuring uniform flow conditions regardless of inlet flow variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inlet flow rate increases during heavy rainfall, then the hydrodynamic separator can handle higher volume flow, but the tangential flow velocity becomes too high causing resuspension of settled solids
Solution Approach 1:
The patent applies dynamics by making the flow director adjustable rather than fixed. The flow director can be positioned at different angles or configurations to dynamically adapt to varying inlet flow rates, allowing the system to maintain optimal tangential flow velocity across different operating conditions and prevent sediment resuspension during high flow events
Solution Approach 2:
The patent changes the flow parameters by adjusting the flow director's position or orientation based on inlet flow conditions. This parameter adjustment allows the system to modify the flow distribution and velocity profile, maintaining effective sedimentation even when inlet flow rates fluctuate significantly
2Productivity
If the inlet flow rate decreases during drought, then the hydrodynamic separator operates at lower volume flow, but the tangential flow velocity becomes insufficient causing direct downward dripping instead of rotational motion
Solution Approach 1:
The adjustable flow director enables the system to dynamically respond to low flow conditions by repositioning to create sufficient tangential velocity component, ensuring that the teacup effect and rotational flow pattern are maintained even at reduced inlet flow rates during drought conditions
Solution Approach 2:
By adjusting the flow director's parameters (position, angle, or configuration), the system optimizes the flow distribution to generate adequate tangential velocity even when the overall inlet flow rate is low, ensuring reliable sedimentation performance across all operating conditions
3Device complexity
If a fixed flow director is used, then the device structure remains simple, but the flow velocity cannot be optimized across varying inlet flow rates
Solution Approach 1:
The patent introduces a dynamically adjustable flow director that can change its configuration based on operating conditions. This dynamic element adds moderate complexity to the device structure but enables the system to adapt to a wide range of inlet flow rates, optimizing performance across different weather conditions and flow scenarios
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 solution stabilizes the tangential flow within the hydrodynamic separator, preventing sediment re-suspension during high flow rates and ensuring sedimentation during low flow rates, thereby enhancing sedimentation efficiency and reducing turbulence.
Implementation Method 1
the flow straightener directs the liquid flowing into the tank through the inlet opening into an inlet flow entering the tank predominantly tangentially in the direction along the inner surface of the side wall
Implementation Method 2
This tangential flow, which subsequently shifts downward due to gravity and thus spirals downward along the inner wall until it rises again in a further inner area
Implementation Method 3
the passage area is adjusted such that the flow-through passage area is larger at a higher liquid level than at a lower liquid level
Data Source
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AI summary
The invention relates to a kit for constructing a hydrodynamic separator from a cylindrical tank in the form of a vertical cylinder with a cylindrical side wall (1) penetrated by a number of radial inlet openings and a further number of radial outlet openings. The kit comprises a flow director for each of the inlet openings for internal attachment to the inlet opening, wherein the flow director redirects the liquid flowing into the tank through the inlet opening into an inlet flow entering the tank predominantly tangentially along the inner surface of the side wall (1).The kit is characterized in that it comprises a flow adjustment device which keeps the tangential flow velocity of the inlet flow constant, regardless of the volume flow of the incoming liquid, or at least adjusts it such that changes in the tangential flow velocity of the inlet flow occurring in response to changes in the volume flow of the incoming liquid are damped. The invention further relates to a hydrodynamic separator comprising a cylindrical tank in the form of a vertical cylinder with a cylindrical side wall (1) penetrated by a number of radial inlet openings and a further number of radial outlet openings, characterized by a built-in kit of the type described above.