Centrifugal Separator Discharge Timing With Pressure-Pulse Control
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Solution Overview
Problem
Existing centrifugal separators face challenges in achieving precise and efficient control over the discharge of solid fractions, particularly due to the reliance on hydraulic systems that assume a fixed volume of fluid corresponds to a specific degree of movement, leading to inefficiencies and imprecise discharge control.
Innovation Solution
A discharge control system actuated by pressurized liquid, utilizing a control valve arrangement with dual-valves to generate precise pressure pulses, controlling the duration of discharge outlet opening and closing based on the time the control valve remains open, enabling faster response and more accurate discharge control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a hydraulic system with fixed volume assumption is used to control discharge, then the system structure is simple, but the discharge control precision is poor
Solution Approach 1:
The patent replaces the traditional hydraulic volume-based control system with a time-based control system. A control unit measures the time duration for which the discharge outlet should remain open, and this time parameter directly controls the discharge quantity. This substitution of time measurement for volume measurement simplifies the control system while improving precision, as time can be measured more accurately than fluid volume in hydraulic systems.
2Quantity of substance
If the discharge outlet remains open for longer duration, then more solid fraction is discharged, but the separation process efficiency decreases
Solution Approach 1:
The patent implements dynamic control of the discharge outlet opening duration based on real-time process conditions. The control unit adjusts the time duration dynamically rather than using fixed duration, allowing optimization between discharge quantity and separation efficiency. The system can adapt the opening duration to match the actual accumulation rate of solid fraction, preventing both over-discharge (which reduces efficiency) and under-discharge (which reduces quantity removed).
Solution Approach 2:
The system incorporates feedback control where the control unit monitors separation process conditions and adjusts the discharge outlet opening duration accordingly. This feedback mechanism ensures that the discharge quantity optimally matches the solid fraction accumulation, maintaining high separation efficiency while achieving the desired discharge volume.
3Measurement precision
If the control valve opens and closes frequently, then the discharge control precision improves, but the response time increases
Solution Approach 1:
The patent replaces mechanical position-based control with time-based control. Instead of measuring how far the valve opens mechanically, the system measures the duration for which the valve remains open using a control unit with timing capability. This substitution eliminates the need for complex mechanical position sensing and reduces the effective response time, as time measurement can be performed electronically with microsecond precision.
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 approach allows for precise and efficient discharge of solid fractions by controlling the duration of the discharge based on valve timing, enhancing the overall efficiency and control of the separation process, reducing the need for complex systems and specialized fluids.
Implementation Method 1
The discharge control system is configured to actuate the opening element by means of a pressurised liquid
Implementation Method 2
Centrifugal separators are used to separate feed mixture components with different densities by accelerating the feed mixture to high rotational speeds. Denser components move outward towards the perimeter of the separator's separation space, forming one or more heavy fractions, while less dense components remain closer to the centre, forming one or more light fractions.
Data Source
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AI summary
A centrifugal separator (100) is disclosed, comprising a rotor (110) for separating a feed mixture into at least a first liquid fraction and a solid fraction. The rotor comprises a discharge outlet (120), which is controlled by an opening element to provide intermittent discharge of the solid fraction. The opening element is actuated by a pressurised liquid provided by a discharge control system (200) comprising a liquid channel (220) configured to fluidically connect the opening element to a reservoir with pressurised fluid, a control valve arrangement (230) operable to selectively open and close the liquid channel, and a control unit (240) configured to control the control valve arrangement to supply the opening element with the pressurised liquid. The discharge control system is configured to actuate the opening element based on a duration for which the control valve arrangement remains open.