Liquid carbon dioxide phase-change refrigeration and cooling technology of high temperature mine
SONG Dongping
ZHOU Xihua
LI Jingyang
BAI Gang
Abstract：In order to solve a high temperature and thermal disaster problems occurred in the production process of the coal mine,based on the space features and technique characteristics of the heading face in the coal mine,a liquid carbon dioxide phase-change refrigeration and cooling technology with the liquid carbon dioxide as the cooling sources of the high temperature coal mine was provided.The cooling volume released from the liquid carbon dioxide phase-change refrigeration and the high temperature air from the heading face were applied to the heat exchange role conducted to reduce the environment temperature and humidity of the heading face.Meanwhile,the gas phase carbon dioxide from the phase-change would be injected to the goaf in order to prevent and control the coal spontaneous combustion.The liquid carbon dioxide phase-change refrigeration and cooling system would have a simple structure device,a convenient operation,low invested cost equipment,high suitability and other advantages.A industrial trial of the liquid carbon dioxide phase-change refrigeration and cooling technology was conducted in No.52305 heading face of Banshi Mine.The results showed that when an average consumption rate of the liquid carbon dioxide was 1.015 m3/h,the air temperature of the heading face was reduced by 6.9 ℃,the humidity was reduced by 4.94 g/kg and the utilization rate of the liquid carbon dioxide cooling volume was 77.36％.The liquid carbon dioxide phase-change refrigeration and cooling technology could effectively improve the working environment in the underground mine and would have the high prospects of the promotion and application.
Keywords：high temperature minecooling technologyliquid carbon dioxidephase-change refrigeration
Publication Date：2017-01-01