4 years ago

Heat Transfer and Fluidization Characteristics of Lignite in a Pulsation-Assisted Fluidized Bed

Heat Transfer and Fluidization Characteristics of Lignite in a Pulsation-Assisted Fluidized Bed
Zhihong Liu, Yuping Liu, Hiroaki Ohara
To address the problem of low drying efficiency increasing lignite dryer size, a pulsation-assisted fluidized bed with horizontal tube bundles was built for investigating the heat transfer in lignite particles with the goal of enhancing the lignite drying rate by introducing a pulsed flow to increase the heat transfer rate. Results showed that the pulsation-assisted flow increased the heat transfer rates by a maximum of 50–100%. The heat-enhancement effect increased as the gas velocity increased, with 3 and 5 Hz pulsation-assisted flows demonstrating higher heat transfer rates than a 1 Hz flow. Local heat transfer rates showed a maximum value at the tube top for lignite. Simulation was conducted to analyze the details of the lignite particles and bubble movements to explain the heat transfer rate enhancement effect.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b01352

DOI: 10.1021/acs.iecr.7b01352

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