西安科技大学学报2017，Vol.37Issue(5)：605-609,5.DOI:10.13800/j.cnki.xakjdxxb.2017.0501
煤矿采空区液态CO2灌注防灭火关键参数研究
Key parameters of liquid CO2 perfusion for fire control in coal mine goaf
摘要
Abstract
For fire prevention and extinguishment in coal mine goaf,liquid carbon dioxide has many advantages when compared with the traditional liquid nitrogen perfusion for fire control system,thus it has a good developmental prospects for fire prevention and extinguishment in coal mine goaf.For research of some key problems in its promotion and application which include the gasification process is easy to be freezed and knocked,the perfusion volume is difficult to calculate,the heat absorption of gasification is difficult to determine,we use methods of indepth analysis for the physical parameters and law of phase transtition for liquid CO2,the results shows as follows:liquid CO2 is easily to be freezed in gasification process,this mainly attributes to it has a higher triple point temperature (-56.6 ℃),when a sudden pressure declination happens,liquid carbon dioxide will gasify quickly,a lot of heat would be absorbed from liquid carbon dioxide which may causes its temperature decline to the triple point,so the first impormant step for anti-freezing in transportation and gasification is to layout bypass gasification pressurization system and uniform gas pressure connecting system,meanwhile keep its pressure above 1.2 MPa,the fire extinguishing perfusion volume have to control oxygen density below to 3％ ～ 5％ and can be obtained according to liquid nitrogen perfusion system;the heat absorption of liquid CO2 is closely relate to its pressure (temperature) and varies greatly,it should be strict accorded to its pressure (temperature)when considering the effect for cooling goaf.These researches provide a new solution for the reliable application and quantitative calculation of the new technology.关键词
液态CO2/采空区/结冰/灌注量/气化吸热量Key words
liquid carbon dioxide/goaf/freeze/perfusion quantity/vaporization heat分类
矿业与冶金引用本文复制引用
邓军,习红军,翟小伟,张嬿妮..煤矿采空区液态CO2灌注防灭火关键参数研究[J].西安科技大学学报,2017,37(5):605-609,5.基金项目
国家自然科学基金(51404191) （51404191）
陕西省重点科技创新团队计划(2012KCT-09) （2012KCT-09）
陕西省自然科学基金(2016JM5016) （2016JM5016）
