Centrifugal Separator Flow Control for Gentle Heavy Phase Discharge

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Solution Overview

Problem

Existing centrifugal separation systems with hermetically sealed separators do not adequately protect sensitive heavy phases from shear forces during the separation process, as they rely on flow control devices that can disrupt the flow.

Innovation Solution

A centrifugal separation system with mechanically hermetically sealed inlet and outlet passages, where the heavy phase outlet is positioned closer to the axis of rotation than the light phase outlet, and a flow control system in the light phase conduit controls the flow based on measurements from feed mixture and phase sensors to ensure gentle handling of the heavy phase.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If flow control devices are installed in the heavy phase conduit to control flow rate, then flow control capability is improved, but shear forces on the heavy phase increase and gentle treatment is compromised

Engineering Contradiction:

Improveflow control capabilityVSAvoidshear forces on heavy phase

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The flow control function is extracted from the heavy phase conduit and relocated to the light phase conduit. By installing the flow control device only in the light phase line, the system maintains flow control capability while eliminating shear forces in the heavy phase pathway, as the heavy phase flows freely without restrictive control elements.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The light phase acts as an intermediary medium for flow control. Since the separator is hermetically sealed, controlling the light phase flow indirectly controls the overall system pressure and flow balance, thereby controlling the heavy phase discharge without directly restricting it. This indirect control mechanism preserves gentle treatment of the heavy phase.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the separator is mechanically hermetically sealed to prevent air ingress, then separation efficiency is improved, but pressure changes at one outlet affect the other outlets due to communicating vessels effect

Engineering Contradiction:

Improvehermetic sealingVSAvoidpressure interdependence

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system incorporates sensors that monitor pressure and flow conditions in real-time, and a control unit that adjusts the flow control device in the light phase conduit based on this feedback. This active feedback control compensates for the pressure interdependence created by hermetic sealing, allowing the system to maintain stable operation despite the communicating vessels effect.

Inventive Principle:

Principle #23Feedback

3Productivity

If the heavy phase outlet is positioned at a larger radius to improve separation efficiency, then separation performance is improved, but shear forces on the heavy phase increase

Engineering Contradiction:

Improveseparation efficiencyVSAvoidshear forces on heavy phase

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system changes the operational parameters by controlling the flow rate of the light phase through the flow control device. By adjusting the light phase flow rate, the system optimizes the pressure balance and centrifugal forces acting on the heavy phase, enabling the heavy phase to be discharged at a larger radius with improved separation efficiency while maintaining gentle treatment through proper parameter coordination.

Inventive Principle:

Principle #35Parameter changes

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 provides a gentle treatment of the heavy phase by minimizing shear forces and eliminating the need for flow control devices in the heavy phase conduit, ensuring efficient and gentle separation of liquid feed mixtures, particularly those containing sensitive components like cells.

Implementation Method 1

a rotor (212) configured to rotate about an axis of rotation (20) and being provided with a separation space (88), a stack of separation discs (92) arranged inside the separation space (88)

Methodology Applied

Scientific EffectCentrifugal separation: Centrifugal Separation

Implementation Method 2

each of the inlet passage (214), the light phase outlet passage (216), and the heavy phase outlet passage (218) is mechanically hermetically sealed between the rotor (212) and respective of the first and second stationary portions (84, 86)

Methodology Applied

Scientific EffectHermetic sealing:

Implementation Method 3

a flow control system (210) comprising a control unit (226), a flow control valve (224) arranged in the light phase conduit (206), a liquid feed mixture measuring device (220), and a light phase measuring device (222) and/or a heavy phase measuring device (223)

Methodology Applied

Scientific EffectFlow control:

Data Source

PatentUS12576410B2Centrifugal separation system and method with flow control to a heavy phase receiving container

Publication Date: 2026.03.17 ALFA LAVAL CORP AB

AI summary

A centrifugal separation system includes a centrifugal separator, a liquid feed mixture conduit, a light phase conduit, a heavy phase conduit, and a flow control system. The flow control system includes a controller, a flow control valve arranged in a light phase conduit, a liquid feed mixture measuring device, and at a light phase measuring device and/or a heavy phase measuring device. The controller is configured to control the flow control valve based on measurements from the liquid feed mixture measuring device and measurements from the light phase measuring device and/or the heavy phase measuring device.