Steam Turbine Outflow Housing Sealing Design
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Solution Overview
Problem
Steam turbines with reheating experience intense temperature fluctuations and mechanical stress due to large temperature gradients, particularly in the outflow region of the turbine housing, which limits their power output and requires extensive fastening elements to compensate for structural loads.
Innovation Solution
An outflow housing design that includes a sealing device to prevent steam from impinging on the turbine housing, featuring a central drum chamber and attachment interface, allowing steam to be directed to a reheater without direct contact, reducing thermal load and eliminating the need for additional sealing shells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If steam turbines are designed with reheating and compact construction, then efficiency and power output are improved, but temperature gradients increase causing intense thermal load on the turbine housing
Solution Approach 1:
The turbine housing is divided into multiple housing parts (first housing part, second housing part) with a parting joint, allowing the structure to accommodate thermal expansion and contraction differently in various regions, thus managing temperature gradients while maintaining compact construction for high power output
Solution Approach 2:
Different regions of the turbine housing are designed with different properties - the first housing part exposed to hot steam has different thermal and structural characteristics compared to the second housing part, with reinforced connections and adjusted material properties in high-temperature zones to handle intense thermal load locally
2Adaptability or versatility
If multiple housing parts are connected with screw connections to accommodate thermal expansion, then adaptability to temperature changes is improved, but mechanical load on connections increases requiring larger fastening elements
Solution Approach 1:
The connection design allows for parameter changes in the form of controlled movement and adjustment at the parting joint, enabling the housing parts to expand and contract independently in response to temperature changes, thereby reducing mechanical stress on fastening elements while maintaining structural integrity
3Productivity
If the available structural space is restricted to achieve compact construction, then productivity and efficiency are improved, but load-bearing capabilities are greatly restricted
Solution Approach 1:
The patent optimizes the spatial arrangement of turbine components by utilizing three-dimensional space more effectively, arranging housing parts and internal structures in optimized configurations that maximize load-bearing capacity within restricted structural space, enabling both compact construction and high load-bearing capability
Data Source
AI summary
An outflow housing for a turbine section of a steam turbine. The outflow housing has an outflow housing wall, which surrounds a central drum chamber along a housing longitudinal axis, and a connection interface for connecting the outflow housing to a turbine housing of the steam turbine. A sealing device for sealing an end of the outflow housing, which end is arranged at the rear in the flow direction, with respect to a turbine shaft of the steam turbine is arranged on the outflow housing wall, wherein the sealing device is sealed to the outflow housing wall. A steam turbine has the outflow housing herein.