For spontaneous combustion possibilities under large flux methane drainage in the goal, dynamic permeability in combination with the Forchheimer nonlinear equation was used to solve the problem of 3D oxygen distributi...For spontaneous combustion possibilities under large flux methane drainage in the goal, dynamic permeability in combination with the Forchheimer nonlinear equation was used to solve the problem of 3D oxygen distribution, heating law in goaf and to forecast the effects of fire protection by taking the fifth section face of the No. 18 coal seam in Nanshan Coal Mine as the basis for this study. The results demonstrate that if the vertical position of the drainage laneway is so low as to cause serious air leakage, a high oxygen concentration area exists in the return side of the goaf, and there is also a high temperature region which has faster heating rate than in the other areas. The effect of methane drainage on goal heating can be alleviated dramatically by simultaneous plugging and nitrogen injection. The results show that gas data in the return side of the goaf must be detected carefully in the work face, which is of similar drainage arrangement. Therefore, comprehensive fire protection measures should be carried out if conditions permit.展开更多
The influence of emulsified oil, suspended solids, Fe3＋, Fe2＋, cationic water clarifier and sulfate-reducing （SR） bacteria on the aggregation behavior of residual hydrophobic modified polyacrylamide in treated oil...The influence of emulsified oil, suspended solids, Fe3＋, Fe2＋, cationic water clarifier and sulfate-reducing （SR） bacteria on the aggregation behavior of residual hydrophobic modified polyacrylamide in treated oily wastewater from polymer flooding was studied by fluorescence spectroscopy and dynamic light scattering. The result of I1/I3 showed that the polarity of hydrophobic microdomains increased, whereas the size of the hydrophobic microdomains may be decreased, where the value of I1/I3 represents the ratio of the intensity of peak 11 （374.0 nm） to that of peak/3 （385.0 nm） of the vibration fine structure of pyrene monomer emission in residual polymer solution. The results of the ratio of I1 at 48 h to I1 at 0 h （I1,48h/I1,0h） indicated that oil and cationic water clarifier could inhibit the aggregation to some extent, while Fe2＋ and suspended solids were helpful for aggregation, and Fe3＋ and SR bacteria had no significant influence on the aggregation of polymer.展开更多
文摘For spontaneous combustion possibilities under large flux methane drainage in the goal, dynamic permeability in combination with the Forchheimer nonlinear equation was used to solve the problem of 3D oxygen distribution, heating law in goaf and to forecast the effects of fire protection by taking the fifth section face of the No. 18 coal seam in Nanshan Coal Mine as the basis for this study. The results demonstrate that if the vertical position of the drainage laneway is so low as to cause serious air leakage, a high oxygen concentration area exists in the return side of the goaf, and there is also a high temperature region which has faster heating rate than in the other areas. The effect of methane drainage on goal heating can be alleviated dramatically by simultaneous plugging and nitrogen injection. The results show that gas data in the return side of the goaf must be detected carefully in the work face, which is of similar drainage arrangement. Therefore, comprehensive fire protection measures should be carried out if conditions permit.
基金supported by the Scientific Research Project of CNOOC(China)(Grant No.CNOOC-KJ 125 ZDXM 06 LTD NFGC 2014-01)
文摘The influence of emulsified oil, suspended solids, Fe3＋, Fe2＋, cationic water clarifier and sulfate-reducing （SR） bacteria on the aggregation behavior of residual hydrophobic modified polyacrylamide in treated oily wastewater from polymer flooding was studied by fluorescence spectroscopy and dynamic light scattering. The result of I1/I3 showed that the polarity of hydrophobic microdomains increased, whereas the size of the hydrophobic microdomains may be decreased, where the value of I1/I3 represents the ratio of the intensity of peak 11 （374.0 nm） to that of peak/3 （385.0 nm） of the vibration fine structure of pyrene monomer emission in residual polymer solution. The results of the ratio of I1 at 48 h to I1 at 0 h （I1,48h/I1,0h） indicated that oil and cationic water clarifier could inhibit the aggregation to some extent, while Fe2＋ and suspended solids were helpful for aggregation, and Fe3＋ and SR bacteria had no significant influence on the aggregation of polymer.
