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Characteristics Analysis of the Blockage Zone in a Gas-Solid Fluidized Bed
Guilin Zhang1, Shulei Song2, Junwei Guo2
1School of Mechanical and Electronic Engineering, Suzhou University, Suzhou, Anhui 234000, China.
Regional blockage in air distributors significantly impacts fluidized bed stability for coal quality improvement. Increased blockage reduces density fluctuations but expands the affected zone, while higher gas velocity improves particle mixing and reduces the disturbance range.
Area of Science:
- * Chemical Engineering
- * Particle Technology
- * Fluidization Dynamics
Background:
- * Fluidized bed technology is crucial for dry separation processes, conserving water resources and enhancing coal quality.
- * Air distributor blockage can disrupt the uniform gas-solid flow, affecting fluidization efficiency and bed stability.
- * Understanding the impact of partial air distributor blockage is essential for optimizing fluidized bed operations.
Purpose of the Study:
- * To investigate the effects of regional air distributor blockage on fluidized bed performance.
- * To analyze the influence of blockage area and fluidization gas velocity on bed stability and fluidization.
- * To reveal the relationship between air distributor plugging and the overall fluidization effect.
Main Methods:
- * Utilization of micro-differential pressure sensors to analyze regional characteristics of fluidized bed blockage.
- * Systematic variation of air distributor blockage area and fluidization gas velocity.
- * Measurement and analysis of pressure fluctuations and density variations within the fluidized bed.
Main Results:
- * Maximum pressure fluctuation standard deviation (>2.0) observed at 100 mm height, with higher fluctuations at the bottom than the top.
- * Increasing plugged area fraction (1/8 to 1/2) decreased bottom density fluctuation range (0.2 to 0.04 g/cm³).
- * Axial range of influence increased from 10 to 16 cm with greater blockage; increased gas velocity reduced the affected zone.
Conclusions:
- * Air distributor blockage significantly alters pressure distribution and density fluctuations in fluidized beds.
- * The extent of blockage directly influences the axial propagation of fluidization disturbances.
- * Optimizing fluidization gas velocity can mitigate the negative impacts of partial air distributor blockage on bed stability.
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