Rotational Filter Element for Gas Turbine Dust Removal
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Solution Overview
Problem
In gas turbines, filter systems face efficiency decreases due to clogging from accumulated dust, which traditional pulse operations fail to address effectively as dislodged dust often re-deposits onto filters, leading to incomplete removal.
Innovation Solution
A filter element is rotated about a longitudinal axis to utilize gravity for dust removal, combined with motion generators and optional blow nozzles or wiper blades to ensure dust falls away from the filter and is collected at the bottom of the filter house system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pulse operation is used to blow dust off filters, then dust is dislodged from filter surfaces, but dust radiates outwardly and re-deposits onto same or other filters
Solution Approach 1:
The filter element is rotated about a longitudinal axis to introduce a rotational dimension to the dust removal process. This rotation causes dust to fall downwardly away from the filter element in a controlled trajectory, preventing the outward radiation and re-deposition that occurs with traditional pulse operations. The dimensional change from static pulse cleaning to rotational cleaning fundamentally alters dust movement patterns.
Solution Approach 2:
The filter element transitions from a stationary position during traditional pulse cleaning to a rotating position during the cleaning operation. This dynamic movement allows gravity to effectively remove dust while the rotation prevents dust from settling back onto the filter surface. The motion generator creates continuous or periodic rotation to maintain dust in a falling trajectory away from the filter.
2Device complexity
If filter operates without rotation, then structure is simpler, but dust accumulates on filter surface increasing pressure drop
Solution Approach 1:
The filter element performs its own cleaning function by rotating about its longitudinal axis. The rotation utilizes gravity to cause accumulated dust to fall downwardly away from the filter element without requiring external cleaning equipment. This self-cleaning mechanism prevents pressure drop increase while adding minimal structural complexity, as the motion generator is integrated into the existing filter assembly.
3Reliability
If filter element is rotated, then dust falls downwardly away from filter, but requires motion generator adding device complexity
Solution Approach 1:
The motion generator serves multiple functions: it rotates the filter element for dust removal, and can be integrated with the existing pulse cleaning system. The rotation mechanism about the longitudinal axis works in conjunction with gravity to create an effective dust removal system that prevents re-deposition. This multi-functional approach justifies the added complexity by significantly improving dust removal reliability.
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 efficiently removes dust from filters without re-depositing it onto other filters, maintaining system efficiency by ensuring dust accumulation at the bottom for easy removal, thereby reducing pressure drop and enhancing gas turbine performance.
Implementation Method 1
rotating the filter element about a longitudinal axis extending in an airflow direction of the air passageway to cause particles accumulated on the filter element to fall downwardly away from the filter element due to gravity
Data Source
AI summary
A filter assembly for a gas turbine system includes a filter element configured to remove entrained particles from air which passes through the filter element in a first direction toward a central air passageway. A motion generator arranged to rotate the filter element about a longitudinal axis extending in an airflow direction of the air passageway to cause particles accumulated on the filter element to fall downwardly away from the filter element due to gravity.