Centrifugal Separator Sludge Discharge Control
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Solution Overview
Problem
Existing centrifugal separators face challenges in automatically triggering the intermittent discharge of the sludge phase, leading to potential loss of liquid phase or accumulation of solids, which affects separation efficiency.
Innovation Solution
A method for operating a centrifugal separator that involves determining the particle flow rate and volume filled with particles within the bowl, allowing for self-triggered discharge of a specific sludge volume or at a specific time point, thereby optimizing the discharge process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If discharge is triggered too early, then liquid phase loss is reduced, but separated solids may escape through liquid outlet or solids may be built up within centrifuge bowl
Solution Approach 1:
The system uses a turbidity sensor to continuously monitor the liquid phase and provides feedback to the control unit. When the turbidity exceeds a predetermined threshold, the control unit triggers discharge through the sludge outlets. This feedback mechanism ensures discharge is triggered at the optimal moment when turbidity indicates sufficient solid accumulation, preventing both premature discharge (which would waste liquid) and delayed discharge (which would cause solids to escape or build up).
Solution Approach 2:
The patent replaces manual or timer-based discharge control with an automated sensor-based control system. The turbidity sensor detects the concentration of suspended solids in real-time, and the control unit automatically opens the sludge outlets when the threshold is reached. This substitution of mechanical/timer control with sensor-based control enables precise, condition-driven discharge timing that optimizes both liquid recovery and solid separation.
2Loss of substance
If discharge is triggered too late, then liquid phase loss is increased, but separated solids may escape through liquid outlet or solids may be built up within centrifuge bowl
Solution Approach 1:
The turbidity sensor continuously monitors liquid phase conditions and provides real-time feedback to the control unit. When turbidity reaches the predetermined threshold, discharge is automatically triggered. This feedback loop ensures discharge occurs at the optimal moment to maximize separation capacity while minimizing liquid loss, preventing both premature and delayed discharge scenarios.
Solution Approach 2:
The system replaces manual discharge control with automated sensor-based control. The turbidity sensor detects when solid accumulation reaches the optimal discharge point, and the control unit automatically opens the sludge outlets. This automation enables precise timing that maintains high separation capacity while minimizing liquid phase loss, overcoming the limitations of timer-based or manual control.
3Reliability
If intermittent discharge is used, then separation efficiency is maintained, but automatic triggering of discharge is challenging
Solution Approach 1:
The system employs a turbidity sensor that continuously monitors the liquid phase and provides automatic feedback to the control unit. When the turbidity exceeds a predetermined threshold, the control unit automatically triggers discharge through the sludge outlets. This feedback-based automation eliminates the need for manual intervention or complex timing mechanisms, achieving reliable automatic discharge triggering that maintains separation efficiency.
Solution Approach 2:
The patent replaces manual or timer-based discharge control with an automated sensor-based system. The turbidity sensor detects solid accumulation in real-time and automatically triggers discharge when the threshold is reached. This substitution of mechanical control with sensor-based automation achieves reliable automatic triggering while maintaining separation efficiency, overcoming the challenge of automating intermittent discharge.
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 method enables more precise and timely discharge of the sludge phase, reducing the risk of liquid loss and solid accumulation, and maintaining the separation efficiency even with varying particle concentrations in the feed mixture.
Implementation Method 1
Centrifugal separators are generally used for separation of liquids and/or for separation of sludge from a liquid. During operation, liquid mixture to be separated is introduced into a rotating bowl and heavy particles or denser liquid, usually water, accumulates at the periphery of the rotating bowl whereas less dense liquid accumulates closer to the central axis of rotation.
Implementation Method 2
the drive member is configured to rotate the centrifuge bowl in relation to the frame around an axis of rotation (X)
Data Source
Figure 1
Figure 2
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AI summary
The present invention provides a method (100) of operating a centrifugal separator (1) for separating at least one liquid phase and a sludge phase from a liquid feed mixture. The centrifugal separator (1) comprises a frame (2), a drive member (3) and a centrifuge bowl (5), wherein the drive member (3) is configured to rotate the centrifuge bowl (5) in relation to the frame (2) around an axis of rotation (X), and wherein centrifuge bowl (5) encloses a separation space (9a) and a sludge space (9b); wherein the separation space (9a) comprises a stack (10) of separation discs arranged coaxially around the axis of rotation (X) and wherein said sludge space (9b) is arranged radially outside said stack (10) of separation discs; wherein the centrifuge bowl (5) further comprises an inlet (14) for receiving the liquid feed mixture, at least one liquid outlet (6) for a separated liquid phase, and sludge outlets (17) for a separated sludge phase arranged at the periphery of the centrifuge bowl (5). The method (100) comprises a step a) of supplying (101) a liquid feed mixture to be separated to the inlet (11) of the centrifuge bowl (5), a step b) of determining (103) a particle flow rate of the liquid feed mixture being supplied in step a), a step c) of determining (104) a volume filled with particles within the centrifuge bowl (5) based on the measurements of step b), and a step d) of discharging (105) a sludge phase comprising said particles via said sludge outlets (17) based on the determination of step b), wherein the discharge is of a specific volume or at a specific time point.