Method for increasing recovery rate of converter gas

• Main Authors: SONG SHENGLI, ZHU ZHIYUAN, MA WENXIN, WANG YONGGANG, QIN DENGPING, SUN SHUOMENG, WANG HAORAN, TAN MINGXIANG, WANG ZHANLONG, YANG FA, WANG LIXIN, HAN JUN, WANG HONGYU, WANG JIAO, YANG JIANPING
• Format: Patent
• Language: Chinese; English
• Published: 17.04.2013
• Subjects: CHEMISTRY; METALLURGY; METALLURGY OF IRON; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS

The invention provides a method for increasing the recovery rate of a converter gas and belongs to the technical field of converter steelmaking. An oxygen gun is lowered below an oxygen opening point and the pressure of compressed air is 0.2-0.6 MPa; a bypass valve is closed; the rotation speed of a fan is 1000-1400 r/min; the content of oxygen is not more than 2 wt%; the content of CO is 30-100 wt%; the capacity of a gas holder is not more than 65,000 m ; and the gun is lowered to blow for 1.5-4 minutes; and if these conditions are all satisfied, the gas begins to be recycled. The capacity of the gas holder is 65,000-80,000 m ; the content of the oxygen is not less than 2 wt%; the content of CO is 20-30 wt%; alarming is given when a three-way valve fails to work or a check valve fails to work; the bypass valve is opened; the pressure of the compressed air is not more than 0.2 MPa; the rotation speed of the fan is 800-1,000 r/min; a housing is at a high level; and the gun is lifted above the oxygen opening po