Guard Filter for Gas Turbine Intake Air Maintenance
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Solution Overview
Problem
Current gas turbine filter systems are inefficient in maintaining clean air intake during operation, as the replacement of filter cartridges can contaminate downstream filters due to high-speed air flows, leading to potential damage and economic losses from turbine shutdowns.
Innovation Solution
A filter system comprising a first filter arrangement, a second filter arrangement with higher efficiency, and a guard filter with lower efficiency positioned between them, allowing for maintenance while the turbine is online, with a flow disturber to manage air flow speed and prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If filter cartridges are replaced during turbine operation, then maintenance time is reduced and productivity is improved, but high-speed air flow contaminates downstream filters causing damage
Solution Approach 1:
A guard filter is positioned between the first filter arrangement and the second filter arrangement to intercept and capture particles dislodged during cartridge replacement. This intermediary filter protects the downstream high-efficiency filters from contamination while allowing maintenance to proceed during turbine operation.
Solution Approach 2:
The filter system is divided into multiple stages: a first filter arrangement for coarse filtering, a guard filter for protection during maintenance, and a second filter arrangement for high-efficiency filtering. This segmentation allows each component to perform its specific function while enabling online maintenance of the first filter without damaging the second filter.
2Reliability
If a second high-efficiency filter is added downstream, then air filtration quality is improved, but the system becomes more complex and expensive
Solution Approach 1:
The filtration system is segmented into a first filter arrangement for coarse filtering and a second filter arrangement for high-efficiency filtering. This segmentation allows the system to achieve high overall filtration quality while assigning specific functions to each stage, making the complexity manageable and justifiable by the improved reliability.
Solution Approach 2:
The first filter arrangement performs preliminary filtration of particles from the air stream before the air reaches the second high-efficiency filter arrangement. This preliminary action reduces the load on the second filter, extending its service life and maintaining system reliability without requiring excessive complexity.
3Loss of time
If filter cartridges are replaced during operation, then turbine shutdown time is reduced, but dirt is dragged through the partition wall contaminating the clean air plenum
Solution Approach 1:
The guard filter acts as an intermediary barrier between the first filter arrangement and the clean air plenum. When cartridges are replaced during operation and high-speed air flow occurs, the guard filter intercepts dirt particles that would otherwise be dragged through the partition wall, preventing contamination of the clean air plenum while allowing continuous operation.
Solution Approach 2:
The guard filter is positioned in advance to counteract the harmful effect of high-speed air flow that occurs during cartridge replacement. By having this protective filter already in place, the system prevents contamination before it can occur, enabling maintenance during operation without the risk of plenum contamination.
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
Enables efficient maintenance of gas turbine filter systems without contaminating the clean air plenum or damaging downstream filters, reducing economic losses by allowing online maintenance and extending the life of high-efficiency filters.
Implementation Method 1
The filter cartridges 123 are periodically cleaned by pulse jets of compressed air oriented in a direction opposite the normal air flow direction through the filter system 122
Implementation Method 2
dirt accumulated on the upstream side of the cartridges 123 is detached therefrom and falls down to the bottom of the chamber 116
Data Source
AI summary
A filter system for filtering intake air of a gas turbine is presented. The filter system includes a first filter arrangement. The filter system further includes a second filter arrangement located downstream from the first filter arrangement and having a collection efficiency higher than a collection efficiency the first filter arrangement. Furthermore, the filter system includes a guard filter arrangement located between the first filter arrangement and the second filter arrangement, where a collection efficiency of the guard filter arrangement is lower than the collection efficiency of the first filter arrangement.