Obstructing Member for Fluidized Bed Reactor Slugging
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Solution Overview
Problem
Fluidized bed reactors face issues with large bubbles forming in the reaction zone, leading to pressure oscillations, mechanical stress, and 'slugging', which can cause ejection of bed material and damage internal components.
Innovation Solution
An obstructing member is positioned in the freeboard region of the reactor, comprising receiving members and connecting elements, made of high-temperature materials like stainless steel or cobalt-based superalloys, designed to occupy 15-60% of the horizontal cross-sectional area, configured to break up rising slugs and reduce slugging by shearing gas bubbles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large bubbles are allowed to rise in the fluidized bed reactor, then gas flow is maintained, but pressure oscillations occur and bed material is ejected
Solution Approach 1:
The obstructing member is divided into multiple receiving members (at least two) connected by connecting elements, creating a segmented structure that spans across the reactor cross-section. This segmentation allows the member to effectively break up large bubbles while maintaining gas flow through the distributed openings in the receiving members.
Solution Approach 2:
The obstructing member acts as an intermediary element positioned between the gas generation zone and the reactor outlet. It intercepts rising bubbles and breaks them into smaller fragments, mediating the gas flow to prevent direct bubble ejection while maintaining overall gas throughput.
2Reliability
If an obstructing member is added to break up bubbles, then slugging is reduced, but device complexity increases
Solution Approach 1:
The obstructing member is designed to perform multiple functions simultaneously: breaking up large bubbles, maintaining gas flow through its permeable receiving members, and withstanding mechanical stresses from bubble collapse. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The receiving members are designed with specific opening configurations and the obstructing member is positioned at calculated heights (1-5 meters above bed surface) to optimize bubble breaking. By adjusting these parameters, the structure achieves effective slugging prevention without requiring excessive complexity.
3Reliability
If the obstructing member occupies larger area, then bubble breaking is more effective, but fluidization is compromised
Solution Approach 1:
The obstructing member has non-uniform structure with receiving members containing openings of varying sizes and distributions. This local variation allows different regions to serve different functions: some areas maximize bubble breaking while others maintain fluidization quality, creating an optimized balance.
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
The obstructing member effectively reduces slugging, preventing ejection of bed material and damage to reactor components while minimizing contamination and maintaining fluidization, by breaking up large gas bubbles and ensuring stable operation.
Implementation Method 1
configured to break up a rising slug of particles in the chamber
Implementation Method 2
break up rising slugs and reduce slugging by shearing gas bubbles
Implementation Method 3
flow upwardly through the particles to form a fluidized bed of particles
Implementation Method 4
Pyrolytic decomposition of silicon-bearing gas in fluidized beds
Data Source
AI summary
Embodiments of an obstructing member and methods for its use in a fluidized bed reactor are disclosed. The obstructing member comprises a plurality of receiving members, each receiving member comprising a tubular wall defining a passageway dimensioned to receive an internal reactor component, and a plurality of connecting elements connecting the receiving members, wherein the obstructing member occupies from 15-60% of a horizontal cross-section of a reaction chamber of the fluidized bed reactor.