On the Characteristics of Coal Breaking by High Pressure Gas-Liquid Two-Phase Jet Impact
At present,hydraulic cutting technology has become one of the main means to control coal mine gas disaster and realize the pressure discharge of coal seam.As a new type of highly efficient multi-medium powerful jet,the high-pressure gas-liquid two-phase jet is better than the traditional single-medium jet.In order to improve the coal breaking performance and pressure increasing effect,the basic parameters,such as the gas content,jet pressure,impact target distance and the nozzle diameter on the impact of the two-phase jet are combined with the ultrasonic system.Results show that the impact erosion of high-pressure gas-liquid jet is more significant than the traditional pure water jet.When the gas content Fa =30%,the jet pressure Pw =10 MPa,the impact target distance Ds=300 mm and the nozzle diameter Dn=3.5 mm,the gas-liquid two-phase jet is better.The test results provide a reasonable reference for the selection of key parameters,such as gas content,jet pressure,impact target distance and nozzle diameter,and effectively improve the effect of high-pressure gas-liquid two-phase jet impact on coal breaking.
NETL
NSTL
万方数据
维普
