Particle Separator Support via Downcomer Pipes in Fluidized Bed Boilers
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Solution Overview
Problem
Bottom-supported fluidized bed boilers face challenges in supporting the particle separator, requiring strong common walls and additional support legs due to uneven thermal expansion and weight distribution, which complicates installation and increases structural demands.
Innovation Solution
A frame-like supporting member is used to surround the conical lower portion of the particle separator, with outboard portions attached to downcomer pipes and inboard portions attached to the furnace side wall, providing a stable and simplified support system that distributes the weight effectively without needing a common wall or special support legs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a common wall construction is used to support the particle separator, then the structural strength is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The support structure is segmented into separate components: the particle separator, the frame-like supporting member, and the downcomer pipes. This segmentation allows each component to be manufactured and installed independently, reducing complexity while maintaining structural strength through proper connection design.
Solution Approach 2:
A frame-like supporting member is introduced as an intermediary element between the particle separator and the downcomer pipes. This intermediary structure distributes the weight of the particle separator to multiple downcomer pipes, providing adequate support without requiring a complex common wall construction.
2Stability of the object's composition
If special support legs are added to support the particle separator, then the stability is improved, but the device complexity and installation difficulty increase
Solution Approach 1:
The downcomer pipes serve multiple functions: they are both part of the fluid circulation system and provide structural support for the particle separator through the frame-like supporting member. This multi-functionality eliminates the need for separate support legs, reducing device complexity while maintaining stability.
3Strength
If the common wall is made stronger to carry the weight, then the strength is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The support function is segmented from the common wall and assigned to separate downcomer pipes connected through a frame-like supporting member. This allows the common wall to be manufactured with standard strength requirements, improving ease of manufacture while the overall structural strength is maintained through the distributed support system.
4Ease of operation
If a bottom-supported construction is used, then the ease of operation is improved, but the structural demands on walls increase
Solution Approach 1:
The frame-like supporting member acts as an intermediary that distributes the structural load from the particle separator to multiple downcomer pipes. This intermediary structure reduces the structural demands on individual walls and the common wall, making the bottom-supported construction feasible while maintaining ease of operation.
Data Source
AI summary
A fluidized bed boiler with a support construction for a particle separator. The fluidized bed boiler includes a bottom-supported furnace in which at least one particle separator with a support construction is in gas flow connection with an upper portion of the furnace and includes a furnace side portion, an outer portion opposite to the furnace side portion, and a conical lower portion. At least two bottom-supported downcomer pipes are in fluid connection with a steam drum and adjacent to the outer portion of the particle separator. The support construction includes a frame-like supporting member surrounding at least a portion of the conical lower portion, and an outboard portion of the supporting member is attached to the at least two downcomer pipes to support the at last one particle separator.