Wettability of Modified Coal Dust of Nanofluids with Different Concentrations
Aiming at the problems,including poor wettability of coal dust,slow water-coal combination,and ineffectual hydraulic slag removal,we chose silica(SiO2)nanofluid,a new liq-uid material with special properties of wetting rock body and improving wettability of coal body,to investigate its effect of strengthening the surface wettability of coal dust,and enhancing the hydraulic slag removal ability as a slag removal medium.Deionized water and nanofluids were se-lected to carry out coal dust wettability experiments:by changing the mass fraction of nanofluids,the particle size of coal dust and the ratio of wetting agent to coal dust,and quantifying the sur-face wettability of coal dust by contact angle meter and other equipment,the study explored the effect and influencing factors of SiO2 nanofluid to strengthen the borehole slagging capability.The results showed that with the increase of the mass fraction of SiO2 nanofluid,the contact an-gle of the coal dust surface gradually decreased to 21.64°,which transformed the coal dust from oil-wettability to water-wettability.In addition,by introducing the enhancement value and en-hancement rate in the analytical process,it was found that the wetting value of coal dust with SiO2 nanofluid was about 8.5 times that of deionized water,and the reinforcement rate was up to 70.8％.This study could provide a direction for the selection of borehole slagging media.
万方数据
维普
