Instantaneous response of biomass particles to fluctuating gas temperatures

PANG Jie; ZHANG Jian

doi:10.16511/j.cnki.qhdxxb.2015.22.014

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Journal of Tsinghua University(Science and Technology) ›› 2015, Vol. 55 ›› Issue (10) : 1125-1129. DOI: 10.16511/j.cnki.qhdxxb.2015.22.014

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Instantaneous response of biomass particles to fluctuating gas temperatures

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Abstract

In turbulent gas-biomass particle combustion, the turbulent fluctuations of the gas velocity affect the particle motion. However, the effects of the turbulent fluctuations of the gas temperature on the particle instantaneous temperature need to be further explored. The instantaneous temperature variations of biomass particles in a hot gas with fluctuating temperatures are analyzed numerically in this study. The results show that the particle temperatures will fluctuate with the gas temperature. The amplitudes of particle temperature fluctuations are affected by the intensity of the gas temperature fluctuations. Increases in the gas temperature fluctuations lead to increases in the particle temperature fluctuations. Increased particle Reynolds numbers enhance the heat transfer between the particles and the gas. As a result, the particle temperature relaxation time decreases, so the particle temperature responds faster to the gas temperature fluctuations and the particle temperature fluctuations increase.

Key words

biomass particle combustion / gas temperature fluctuation / particle instantaneous temperature / particle temperature relaxation time

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PANG Jie, ZHANG Jian. Instantaneous response of biomass particles to fluctuating gas temperatures[J]. Journal of Tsinghua University(Science and Technology). 2015, 55(10): 1125-1129 https://doi.org/10.16511/j.cnki.qhdxxb.2015.22.014

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