| 摘要 |
PURPOSE:To rapidly and accurately adjust the vacuum degree in the vessel to desired value and safely and smoothly carry out the operation, by carrying out the control of blowing of control gas in the system, injecting vapor pressure of ejector and exhaust gas flowing volume etc. CONSTITUTION:The cut-off valve 21, 22, 23 of the exhaust gas take-ut tube 18, 19, 20, are switched by the change-over circuit 24 corresponding to the pressure level in the degassing vessel 1 and necessary control gas is sent to the blowing piping 14. Also, the steam pressure control valve 26 provided on the pressure display controller Pic, is equipped on the vapor injection piping 25 in the steam ejector 2 and jetting steam volume from the nozzle N is controlles so as to correspond with the set up pressure value. Or, the pressure control part is equipped on connecting duct connecting each ejector 2-7 of exhaust gas system and openig degree of damper etc. is controlled. By the above method, operation corresponding to the purpose of degassing treatment against each molten steel, is able to carry out. |
