Hinged Baffle Assembly for HRSG Exhaust Leakage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional baffle systems in heat recovery steam generators (HRSGs) of combined cycle power plants face issues with improper installation, leading to gaps and leakage of exhaust gas, which reduces efficiency and operational performance due to shifting baffle positions and limited installation complexity.
Innovation Solution
A hinged baffle assembly with a baffle plate, hinge component, and diverter plates is introduced, allowing for adjustable rotational positioning within the HRSG, facilitating easier installation and minimizing gaps by using a removable panel and extension plates to secure the baffle assembly in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional baffle systems use track systems to hold elongated sheets, then the baffle system can be installed within the HRSG, but the sheets shift over time creating gaps between them
Solution Approach 1:
The baffle sheet is designed with a hinge component that allows it to rotate from an initial position to a final positioned state. This dynamic positioning mechanism enables the baffle to adapt to thermal expansion and contraction while maintaining secure engagement with the track system, preventing sheet shifting and gap formation.
Solution Approach 2:
The baffle assembly is pre-assembled with the hinge component and diverter plate before installation into the HRSG. This preliminary assembly ensures proper alignment and engagement of all components, eliminating installation errors that could lead to gap formation and improving overall positioning accuracy.
2Ease of operation
If conventional baffle systems are installed within the HRSG, then exhaust gas flow can be directed, but installation is difficult and time consuming resulting in improper installation
Solution Approach 1:
The baffle assembly including the baffle sheet, hinge component, and diverter plate is pre-assembled as a complete unit before installation. This preliminary assembly allows all components to be properly positioned and secured in advance, transforming a complex multi-step installation into a single-unit installation that is both easier and more accurate.
Solution Approach 2:
The baffle system is segmented into a modular assembly that can be installed as a complete unit. The hinge component and diverter plate are integrated with the baffle sheet to form a self-contained assembly that simplifies installation while maintaining precision through pre-established component relationships.
3Device complexity
If gaps form between baffle sheets, then the baffle system structure is simple, but exhaust gas leaks from the desired flow path reducing efficiency
Solution Approach 1:
The hinge component enables the baffle sheet to dynamically adjust its position, allowing the sheet to maintain continuous contact with adjacent sheets and sealing surfaces despite thermal expansion, contraction, or minor misalignments. This dynamic adjustment prevents gap formation and exhaust gas leakage while maintaining a relatively simple overall structure.
Solution Approach 2:
The diverter plate acts as an intermediary element that directs exhaust gas flow along the desired path and prevents leakage through gaps. By positioning the diverter plate to contact the baffle sheet, it creates a sealing effect that redirects any potential leakage paths back into the intended flow direction.
Data Source
AI summary
Hinged baffle assemblies for heat recovery steam generators (HRSGs) are disclosed. The baffle assemblies may include a baffle plate for directing exhaust fluid through a casing of the HRSG. The baffle plate may include first and second ends, a first surface exposed to the exhaust fluid flowing through the casing, and a second surface opposite the first surface. The baffle assemblies may also include a hinge component coupled to the first end of the baffle plate and positioned within/fixed relative to the casing. Additionally, the baffle assemblies may include a first diverter plate positioned adjacent to the second end of the baffle plate. The first diverter plate may directly contact the first surface of the baffle plate and may aid in directing the exhaust fluid through the casing of the HRSG.