The invention discloses a control method for preventing explosion venting of a dry dedusting
system in converter
smelting process. The control method includes the steps of: firstly adding steel scraps into a converter, and then feeding molten iron into the converter; supplying
oxygen to the liquid surface of the molten iron from the top through a
oxygen lance, feeding stirring gas into the molten iron from the bottom to dephosphorizing the molten iron, at the same time controlling the
oxygen supply intensity at all periods of time, and purging a
flue of the converter for 90seconds through
nitrogen 30seconds before the dephosphorization process is finished; bringing up the oxygen lance after the dephosphorization process is finished and conducting rapid deslagging operation to the converter; and decarbonizing the molten iron, bringing up the oxygen lance after the decarbonization process is finished, and then tapping of
molten steel is carried out. According to the invention, in the method, the
nitrogen purging time is set through a PLC(
Programmable Logic Controller) program, the opening degree of an oxygen flow valve of the converter is set to be 40% and the oxygen
release point of the oxygen lance of the converter is set to be 13.73m. Therefore, the problem of
ignition delay upon release of oxygen is solved and the problem that explosive gas mixture is easy to produce in the dephosphorization process after the oxygen lance is brought up is avoided. The control method is simple and effective and is low in cost.