Patent ID: 6228142
Filing Date: 2001-05-08
Classification: C21B

Abstract:
An apparatus for keeping an optimal penetration depth formed at a front end of an oxygen tuyere including a melter gasifier for producing molten pig iron, a plurality of oxygen tuyeres formed around the outer lower portion of said melter gasifier for blowing oxygen into said melter gasifier, a cyclone for receiving an exhausted gas from said melter gasifier and for separating powder from said exhausted gas, a pre-reducing furnace for receiving said exhausted gas passed through said cyclone and for pre-reducing iron ores and a scrubber having a cone for controlling pressure in said melter gasifier, said apparatus comprising:a sensor means including a laser for measuring distance installed at one of said oxygen tuyeres for continuously measuring said penetration depth;a process computer for continuously receiving said measured penetration depth from said sensor means and for comparing said received penetration depth with a predetermined optimal penetration depth to obtain a difference between said actual penetration depth and said optimal penetration depth, and for obtaining a changing amount of a pressure in said melter gasifier through a mutual relation between a predetermined changing amount of a pressure in said melter gasifier and a changing amount of said penetration depth using said difference between said actual penetration depth and said optimal penetration depth; anda scrubber cone controlling device for receiving said changing amount of said pressure in said melter gasifier from said process computer and for changing an opening degree of a scrubber cone to change said pressure in said melter gasifier.