Instability of flow field in chemical industry park based on wavelet entropy

ZHOU Chenglong; CHEN Tao

doi:10.16511/j.cnki.qhdxxb.2020.25.032

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Journal of Tsinghua University(Science and Technology) ›› 2021, Vol. 61 ›› Issue (2) : 135-143. DOI: 10.16511/j.cnki.qhdxxb.2020.25.032

SPECIAL SECTION: SAFETY MONITORING

Instability of flow field in chemical industry park based on wavelet entropy

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Abstract

Monitoring and tracing of unorganized volatile organic compounds (VOCs) emissions in petrochemical parks is important to maintaining public safety with the local flow field characteristics at the monitoring points being the key to accurate tracing. A distributed monitoring system was designed to identify unorganized emissions of volatile organic compounds in petrochemical parks with numerical simulations to study the transient flows in equipment areas. The time-varying signal of the measured flow field was processed using wavelet entropy theory to relate the flow field stability to various flow parameters. The results show that the wavelet entropy can characterize the flow instabilities. The correlation analysis shows that the wind speed wavelet entropy and the wind direction variance strongly correlate with the wind direction wavelet entropy and the flow field instabilities. The results also show that the wind speed changes correlate negatively with the wind direction wavelet entropy, while the mean wind deflection and the wind speed variance are not related to the flow instabilities.

Key words

volatile organic compounds (VOCs) / unorganized emissions / monitoring traceability / flow field instabilities / wavelet entropy

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ZHOU Chenglong, CHEN Tao. Instability of flow field in chemical industry park based on wavelet entropy[J]. Journal of Tsinghua University(Science and Technology). 2021, 61(2): 135-143 https://doi.org/10.16511/j.cnki.qhdxxb.2020.25.032

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