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Experimental investigation of the impact of liquid carbon dioxide injection on temperature in pulverized coal

Zhijin Yu, Song Yang, Hu Wen and Jun Deng

Greenhouse Gases: Science and Technology, 2020, vol. 10, issue 1, 147-159

Abstract: Using liquid carbon dioxide (LCO2) as a medium for underground coal fires prevention and control, while reducing the emissions of CO2, is a promising option for CO2 utilization worldwide. However, the mechanism of LCO2 flow with phase transition on coal temperature is still not clear. In this work, an experimental system was designed and fabricated to investigate the phase transition behavior and temperature variation during injecting LCO2 into pulverized coal and the impact of mass flow rate, nozzle diameter, and injection pressure on cooling effect. The results indicate that when LCO2 was injected into the pulverized coal, the instantaneous phase change into solid and vapor occurred just after leaving the release port. An intensive heat transfer process occurred because of the throttling effect, flashing effect, and sublimation and thereby formed a cooling area (

Date: 2020
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Handle: RePEc:wly:greenh:v:10:y:2020:i:1:p:147-159