Cyclone Separator Suspension for Fluidized Bed Boiler
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Solution Overview
Problem
Large fluidized bed boilers with non-rectangular separators face issues with uneven load distribution and local stress due to conventional suspension methods, leading to structural challenges and increased construction costs, as well as difficulties in measuring the weight of separators and flue gas channels.
Innovation Solution
The separator construction features a frame at the upper circumferential edge connected to hanger rods or wires, evenly distributing the load across the separator's periphery, allowing direct support to primary steel structures and enabling accurate weight measurement, while allowing for flexible design of the flue gas channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional suspension methods using hanger rods arranged at intervals are used for non-rectangular separators, then the separator can be supported, but heavy local loads and uneven stress distribution occur
Solution Approach 1:
The suspension system is segmented into multiple hanger rods distributed around the separator perimeter, with each rod independently supporting a portion of the load. This segmentation allows for more uniform stress distribution compared to fewer concentrated support points.
Solution Approach 2:
The hanger rods are strategically positioned at specific locations around the separator perimeter to optimize load distribution. The local support characteristics are tailored to match the structural requirements at different positions, ensuring even stress distribution while maintaining structural reliability.
2Strength
If separators are suspended directly to primary steel structures, then support is provided, but construction costs increase and design flexibility decreases
Solution Approach 1:
The hanger rods serve as intermediary elements between the separator and the primary steel structure. This intermediate suspension system provides the necessary support strength while allowing for more economical construction compared to direct rigid connections, and enables greater design flexibility for the separator geometry.
3Stress or pressure
If the number of hanger rods is increased to distribute load evenly, then stress distribution improves, but device complexity and construction costs increase
Solution Approach 1:
Instead of using a continuous support structure or an excessive number of hanger rods, the invention employs a partial action approach with a specific optimized number of hanger rods positioned at key locations. This provides sufficient stress distribution while avoiding the complexity and cost of more extensive suspension systems.
Data Source
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AI summary
The present invention relates to a separator construction of a fluidized bed boiler. The invention thus relates to a fluidized bed boiler, comprising generally speaking the actual furnace and means for treating flue gases as well as means for circulating bed material and returning said material to the furnace. The invention especially relates to suspending a separator used in connection with such a power boiler. It is a typical feature of a separator construction in accordance with the invention, the separator comprising walls (38), a ceiling, and inlet and outlet conduits (14, 22) of the separator, the separator being suspended to a supporting structure (18) from above in the boiler building, that the suspending means are formed of a frame (30) arranged in connection with an upper margin of the wall (38) of the separator (12) and of suspending bars or wires (40) connecting the frame (30) directly to said supporting structure (18).