Centrifugal Separator Nozzle With Expanded Chamber Elbow
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Solution Overview
Problem
Centrifugal separator nozzles experience high abrasive wear due to the continuous discharge of solids, leading to erosion in the nozzle channels and bowl body, which reduces their durability and efficiency.
Innovation Solution
A nozzle design featuring an elbow portion with an expanded chamber in the fluid channel, made from materials like tungsten carbide, and an additive manufacturing method to create a smooth inner surface, along with a reinforcement portion at the outlet for increased hardness, helps in reducing abrasive erosion by altering the sludge flow and distributing wear evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional nozzle designs are used for continuous sludge discharge, then the nozzle can maintain simple structure and ease of manufacture, but the nozzle experiences high abrasive wear and erosion leading to reduced durability
Solution Approach 1:
The fluid channel incorporates an elbow portion with curved geometry instead of sharp angles, creating a smoother flow path that reduces turbulence and minimizes erosive forces on the nozzle walls. The curved design distributes wear more evenly throughout the channel.
Solution Approach 2:
The cross-sectional area of the fluid channel is varied along its length, with the elbow portion having a larger cross-sectional area than adjacent portions. This parameter change creates an expanded chamber that reduces flow velocity and kinetic energy of the sludge, thereby reducing abrasive wear on the nozzle surfaces.
2Productivity
If the nozzle channel cross-sectional area is reduced to increase discharge velocity, then productivity improves, but abrasive wear and erosion of the nozzle increases
Solution Approach 1:
The elbow portion uses curved geometry to smoothly redirect flow without creating sharp edges or corners where high-velocity sludge would cause concentrated erosion. The curved path maintains discharge efficiency while distributing wear forces.
Solution Approach 2:
The cross-sectional area parameter is strategically varied: the elbow portion has a larger area to reduce velocity and wear, while the outlet portion can be optimized for discharge velocity. This parameter optimization allows maintaining productivity while reducing abrasive wear in critical areas.
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 nozzle design significantly enhances wear resistance and durability, reducing erosion and extending the lifespan of the nozzle and centrifuge bowl components, while maintaining efficient sludge discharge in high-solids applications.
Implementation Method 1
the elbow portion forms an expanded chamber having a larger inner cross-sectional area than the inner cross-sectional area of the portions of the fluid channel adjacent to said elbow portion
Implementation Method 2
During operation, liquid mixture to be separated is introduced into a rotating bowl and heavy particles or denser liquid accumulates at the periphery of the rotating bowl whereas less dense liquid accumulates closer to the central axis of rotation
Data Source
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AI summary
The present invention provides nozzle (30) for a sludge outlet (17) of centrifuge bowl (10) of a centrifugal separator (1). The nozzle (30) is comprising a nozzle body (31) adapted to be engaged and releasably positioned in a sludge outlet (17) of said centrifuge bowl (10). The nozzle body (31) comprises an inlet (32) for sludge that is to be ejected from the centrifuge bowl (10), an outlet (33) for ejecting the sludge to the outside of the centrifuge bowl (10) and a fluid channel (34) extending between said inlet (32) and outlet (33). Further, the fluid channel (34) comprises an elbow portion (35) in which the fluid channel (34) changes direction, wherein the elbow portion (35) forms an expanded chamber having a larger inner cross-sectional area (A1) than the inner cross-sectional area (A2, A3) of the portions of the fluid channel (34) adjacent to said elbow portion (35). The present invention also provides a centrifugal separator comprising a nozzle in at least one sludge outlet.