Optical Measurement on Particle Velocity in a Large-Scale Circulating Fluidized Bed Boiler Furnace

doi:10.11930/j.issn.1004-9649.2015.12.59.4

Abstract

Abstract: Distribution of particle velocity in the circulating fluidized bed boiler furnace has important influence on issues of combustion, heat transfer and abrasion. Experimental measuring holes are set on the water walls of a 330 MW circulating fluidized bed boiler furnace. A water cooled optical fiber probe is used to measure the local particle axial velocity in the furnace. Horizontal distribution of particle axial velocity near the water wall, boundary layer thickness, downward velocity of cluster and relative velocity of gas and particle are studied. Results show that negative particle axial velocity exists on the water wall. Particle axial velocity increases with the increment of distance to the water wall. Particle axial velocity is positive in the core region of furnace. The boundary layer thickness is about 0.1~0.2 m. The boundary layer thickness increases slightly with the increment of distance to the top of furnace. Downward velocity of cluster is less than 1 m/s. The relative velocity of gas and particle (about 2.05~2.73 m/s) is higher than the particle terminal velocity.

Key words: circulating fluidized bed boiler, optical fiber probe, cross-correlation method, particle velocity

CLC Number:

TM621

ZHOU Xinglong, SUN Ping, XIE Jianwen, YANG Bin, GAO Shengbin. Optical Measurement on Particle Velocity in a Large-Scale Circulating Fluidized Bed Boiler Furnace[J]. Electric Power, 2015, 48(12): 59-63.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2015.12.59.4

https://www.electricpower.com.cn/EN/Y2015/V48/I12/59

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