摘要
汽雾阻化是使阻化液雾化后进入采空区阻止煤氧化、防止采空区煤炭自然发火的技术。针对现有雾化技术喷嘴易堵塞、动力不足及雾化量有限的缺点和不足,构建新型雾化实验系统,通过理论和实验分析,对雾化参数进行研究。结果表明:(1)气体流量和气体压力,水流量和水压基本为线性关系,且不同初始设定压力下变化趋势相似;(2)不同初始压力下,细水雾的粒径随气体流量的增大而减小,细水雾的粒径随气体压力、水流量和水压的增大而增大;(3)在初始压力P一定条件下,雾化装置存在雾化的临界气压和水压,当水流量水压很小时,水压不足以克服喉管处气体压力进入雾化装置雾化,细水雾产雾量为0的压力值并非其临界压力,氮气阻化细水雾临界水压要高于正常产雾情况下的最低水压。本文研究成果将丰富细水雾防灭火方面的理论和实验研究,推动氮气阻化细水雾在煤矿防灭火领域的应用。
The technology of mist retarder preventing is used extensively for the prevention of coal selfignition with the inhibited water mist with nitrogen passes into coal mined out area. Aiming to the easily blocking of atomizing nozzles, underpowered and limited atomization quantity,a new experimental system of inhibited water mist with nitrogen is built to study atomization parameters through theoretical and experimental analysis. The results show that：（1）the flow and pressure of gas have linear relationship, which is same to the fluid, and the change trend at different initial setting pressure is similar; （2） under different initial pressure,the water mist particle size decreases with the increase of gas flow and increase with the increase of gas pressure, water flow and water pressure;（3）the critical pressure and water gage of atomization device exists when the initial pressure P under certain conditions, the fluid won＇t atomised for the water pressure is not enough to overcome the gas pressure of the throat when the water pressure is very small,the pressure value is not the critical pressure when the fog saturation of water mist is 0,the critical pressure of inhibited water mist with nitrogen is higher than the minimum water pressure under normal atomization. The research results will provide a new technical means for mine fire control,and promote the development and application of inhibited water mist with nitrogen in the fire prevention and control technology.
出处
《中国矿业》
北大核心
2017年第8期154-159,164,共7页
China Mining Magazine
基金
国家自然科学基金项目资助(编号:51374202)
关键词
汽雾阻化
雾化特性
粒度
mist retarder
atomization characteristics
particle size
