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Experimental study on gas uniformity at the inlets of six cyclones in a CFB with multi-tracer gas method

Particuology 2024年第11期94卷 187-196页

作者： Qingyu Zhang Leming Cheng Kun Li Zhangke Ma Qifeng Yu Institute for Thermal Power Engineering State Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou310027China

To investigate the non-uniform distribution of different gases passing through the parallel cyclones,experiments were conducted on a circulating fluidized bed(CFB)equipped with six asymmetrical cyclones.A multi-tracer gas method was used,with CO,O_(2),and CO_(2) chosen to represent gases with different properties in the flue gas at the inlets of the *** uniformity of multi-gas distribution was evaluated by measuring the concentration deviations of each tracer gas passing through individual *** results indicate that the concentrations of multi-tracer gases are higher in the middle cyclone among the three,which are located on the tracer gas injection side during the test of single-side secondary air(SA)*** maximum concentration deviation of tracer gases is for CO_(2),while the minimum is for *** the three cyclone inlets on the opposite side,the tracer gas with higher density exhibits a more uniform distribution,and the gas uniformity decreases as the density *** effects of superficial velocity,SA ratio,bed inventory,and tracer gas injection region on the uniformity of gas distribution were *** results show that superficial velocity and SA ratio primarily affect the uniformity of higher density gases,while bed inventory has a greater influence on lower density *** gas distributions are most non-uniform,especially for CO_(2),when the tracer gas injection region is near the rear wall closer to the induced draft fan during the test of regional SA tracing.

关键词： Circulating fluidized bed multi-gas uniformity Parallel cyclones multi-tracer gas method

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