Abstract
In this paper, cold-state experiments were conducted in a self-built circulating fluidized bed to study the influences of total air volume, ratio of the volume of secondary air to total air (SAR), velocity of secondary air and the secondary injection height on the penetrability of secondary air, the chamber’s pressure drop, the particle circulating flow rate and the distribution of particle concentration. Results suggest that when the total air volume rises or SAR decreases, the chamber’s overall pressure drop and circulating flow rate increase. Apparent particle concentration increases substantially when total air volume rises and the increase of SAR is capable of promoting particle concentration around the area where the secondary air is injected. Penetration depth of secondary air jet increases with the increase of SAR, jet velocity and injection height while the total air volume alone has little effect on jet’s penetration depth.KeywordsCFBSecondary airPenetrabilityPressure drop
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