Experimental investigation on phase transition and heat transfer characteristics for liquid carbon dioxide in loose coal

doi:10.16265/j.cnki.issn1003-3033.2020.06.015

Abstract

Abstract: In order to investigate heat transfer characteristics of LCO₂ injected in loose coal and study influence of injection parameters on temperature field of coal, experiments on LCO₂ injection process were carried out by using self-made test platform. Then, temperature changes of coal and influence of injection parameters on refrigeration range were analyzed. The results show that when LCO₂ is injected into loose coal, phase transition occurs immediately, and an intensive heat transfer process starts and forms a phase-change cooling area (<-56.6 ℃) which sees a logarithm increase over injection time in direction of CO₂ jet. Meanwhile, the cooling area increases in a form of exponential, logarithm and linear function respectively along with increase of injection flow, caliber and pressure

Key words: loose coal, liquid carbon dioxide (LCO₂), heat transfer characteristic, injection parameter, cooling area

CLC Number:

X936

YU Zhijin, YANG Song, GU Yu, DENG Jun. Experimental investigation on phase transition and heat transfer characteristics for liquid carbon dioxide in loose coal[J]. China Safety Science Journal, 2020, 30(6): 98-105.

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