Sparger Design for Fluidized Bed Blockage Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fluidized bed systems face blockages due to solid particles falling through gas distributors and accumulating in gas-supplying lines, leading to disrupted gas flow and pressure fluctuations, which existing methods fail to adequately prevent or manage.
Innovation Solution
A sparger design with a height difference between the gas-supplying source and the sparger greater than the solid layer height, combined with a subsidiary gas-injecting mouth for fluidizing particles and an ejector-type gas-injecting mouth to minimize frictional loss and facilitate particle removal, effectively preventing blockages and managing pressure fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional gas distributor with holes is used, then gas distribution is achieved, but solid particles fall through the holes and accumulate in the gas-introducing chamber, causing blockages
Solution Approach 1:
The patent removes the traditional gas distributor with holes from the system and replaces it with a sparger that injects gas through the side wall of the gas-introducing chamber. This extraction of the harmful element (holes that allow particle passage) while maintaining the essential function (gas distribution) resolves the contradiction between achieving gas distribution and preventing solid particle blockage.
Solution Approach 2:
The sparger acts as an intermediary device between the gas source and the solid particles. Instead of directly distributing gas through holes in the chamber bottom (which allows particles to pass), the sparger introduces gas laterally through its side wall, serving as a mediator that enables gas distribution without creating pathways for particle accumulation.
2Ease of manufacture
If the gas-supplying source is placed at the same level or below the sparger, then installation is simplified, but pressure fluctuations cause solids to enter the gas-supplying line and block it
Solution Approach 1:
The patent positions the gas-supplying source in a different vertical dimension (above the sparger) rather than at the same level or below it. This spatial reconfiguration in the vertical dimension creates a gravity-based barrier that prevents solid particles from entering the gas-supplying line during pressure fluctuations, while the connection geometry maintains installation feasibility.
Solution Approach 2:
By placing the gas-supplying source above the sparger, the system uses gravity as a counteracting force to prevent solid particles from moving upward into the gas-supplying line during pressure surges. This gravitational counterweight effect opposes the harmful force of pressure-induced particle migration.
3Reliability
If gas injection is stopped temporarily, then particle accumulation in the sparger is prevented, but frictional loss increases and particles block the gas-supplying line
Solution Approach 1:
The patent introduces a preliminary action step before resuming normal gas injection: a purge gas injection step is performed to fluidize and remove accumulated particles from the gas-supplying line and sparger. This preliminary action prevents particle blockage before the main gas injection resumes, maintaining system reliability without requiring prolonged stoppages that would cause excessive frictional loss.
Solution Approach 2:
The system employs periodic purge gas injection cycles interspersed with normal operation. Instead of continuous operation that would lead to progressive particle accumulation and high frictional loss, the periodic purging action maintains clear flow paths while minimizing the total time lost to interruptions.
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 solution prevents solid particles from blocking the gas-supplying line and sparger, ensures continuous gas flow, and effectively removes particles using fluidization and vacuum suction, thereby maintaining system efficiency and stability.
Implementation Method 1
a fluidized bed reactor to store a solid layer with a certain height (HS) inside of it and to fluidize the solid layer with fluidization gases injected
Implementation Method 2
an ejector-type gas-injecting mouth to minimize frictional loss and facilitate particle removal
Data Source
AI summary
The present invention relates to a fluidized bed system having a sparger capable of minimizing a blockage by solids and controlling method thereof. And, more specifically, the present invention relates to a fluidized bed system having a sparger capable of minimizing a blockage by solids comprising a fluidized bed reactor to store a solid layer with a certain height and to fluidize the solid layer by using fluidization gases; a sparger having a pipe shape submerged in the solid layer and having a plurality of gas-discharging holes to spray fluidization gases onto the solid layer; and a gas-supplying line having its one end contacting a gas-supplying source and the other end connected to the sparger, wherein fluidization gases are introduced through the gas-supplying line into the sparger by driving the gas-supplying source, the fluidization gases are sprayed through the gas-discharging holes onto the solid layer, the gas-supplying source is placed higher than the sparger and the height difference (Hg) between the gas-supplying source and the sparger is greater than the height of the solid layer.