Gas Turbine Exhaust Guide Swirl Device for Pressure Loss Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing exhaust gas guides for gas turbines face challenges in achieving compactness while minimizing pressure losses and ensuring uniform flow distribution, especially with increasing cross-sectional opening angles, and they require longer distances for complete mixing of hot exhaust gas streams from burners with turbine exhaust gases.
Innovation Solution
The implementation of a swirl device with leading edge swirls in the expanding cross-sectional area of the flow channel, which generates stable swirl systems that distribute the exhaust gas flow uniformly and reduces pressure losses by applying the turbulent flow continuously to the channel wall, allowing for a compact design and efficient mixing of hot exhaust gas streams over a short distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If guide sheets, deflection sheets, or deflection gratings are installed in the expanding cross-section area to generate turbulence, then flow uniformity is improved, but pressure losses increase and turbulence effects are insufficient
Solution Approach 1:
The patent changes the geometric parameters of the installed surface by providing multiple surfaces (first, second, third surfaces) with different orientations and positions in the expanding cross-section area. This creates optimized turbulence patterns that improve flow uniformity while minimizing pressure losses compared to single-surface configurations.
Solution Approach 2:
The installed surface is segmented into multiple separate surfaces (first installed surface, second installed surface, third installed surface) rather than using a single continuous structure. This segmentation allows each surface to generate turbulence in specific zones, achieving more uniform overall flow distribution with reduced total pressure loss.
2Manufacturing precision
If the cross-sectional area of the flow channel is expanded to improve flow uniformity at the waste heat boiler entry, then the exhaust gas guide length increases, but compactness deteriorates
Solution Approach 1:
The installed surfaces are positioned in the expanding cross-section area to pre-generate turbulence and mix the flow before it reaches the waste heat boiler or gas diverter. This preliminary action achieves flow uniformity earlier in the flow path, eliminating the need for excessively long guide sections and enabling more compact designs.
3Power
If multiple burners are installed in the flow channel for auxiliary firing, then power output increases, but the distance required for complete mixing of exhaust gas streams increases
Solution Approach 1:
The installed surfaces act as intermediaries between the multiple burners and the main exhaust gas flow. They generate turbulence that actively promotes mixing of the hot exhaust gas streams from the burners with the cooler turbine exhaust gases, achieving complete mixing over a shorter distance and enabling more compact arrangement of the burners.
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 solution enables a compact exhaust gas guide with reduced pressure losses and uniform flow distribution, independent of gas quantity variations, and shortens the distance required for mixing hot exhaust gas streams with turbine exhaust gases, enhancing the efficiency and compactness of gas turbine power plants.
Implementation Method 1
Introducing guide sheets, deflection sheets, deflection gratings, or similar structures to generate turbulence as installed surfaces in the area of the expanding cross-section of the flow channel
Implementation Method 2
a flow channel, which has a cross-section expanding in at least some areas in the main flow direction
Data Source
AI summary
The present invention relates to an exhaust gas guide of a gas turbine, which is situated between the gas turbine and a downstream waste heat boiler or a downstream gas diverter and which comprises a flow channel which has a cross-section expanding in at least some areas in the main flow direction, having installed surfaces influencing the flow. In order to achieve a more compact implementation of the exhaust gas guide and simultaneously avoid or reduce pressure losses, the installed surfaces are implemented as a swirl device generating a leading edge swirl, which is situated in the diverging area of the flow channel and is implemented to distribute the exhaust gas flow uniformly over the flow cross-sectional area upon entry into the waste heat boiler or the gas diverter. Furthermore, the present invention relates to a method for mixing the exhaust gas of a gas turbine with hot exhaust gas streams generated in an auxiliary firing of at least one burner. This thorough mixing is achieved by generating at least one leading edge swirl system in the flow channel.