Process and Equipment for Blast Furnace Ironmaking Using Pure Oxygen and Gas

Abstract

Process and equipment for blast furnace ironmaking using pure oxygen and gas The process for blast furnace ironmaking using pure oxygen and gas includes putting a mineral aggregate consisting of pellet, alkaline sinter, coke and solvent into the furnace from the furnace top, wherein each ton of iron is assigned with coke of 170-200 kg; blasting pure oxygen into the furnace, wherein each ton of molten iron is blasted with oxygen of 120-200 Nm 3 , and ejecting gas that is pressured and preheated by the ball type hot blast stove into the furnace so as to directly reducing pellet and iron-containing material, wherein the gas is preheated to a temperature raging from 900° C. to 1150° C. and to a pressured up to 0.1-0.6 MPa; purifying and cooling the gas produced in the reducing reaction, and transmitting the gas into a residual pressure power generation device via tubes to be reused and is recovered into a gas cylinder or recycled for use. By using the above process of the present invention, the blast furnace productivity is tremendously increased. The blast furnace productivity is up to 6-8 ton iron/m 3 *D, the solvent consumption is reduced by two-thirds, the slag amount is reduced by two-thirds, the comprehensive consumption of iron of each ton is up to 492 kgCE/t, and the furnace top gas can be recycled to generate power.

1 . A process for blast furnace ironmaking using pure oxygen and gas, comprising:
 (a) putting a mineral aggregate consisting of pellet, alkaline sinter, coke and solvent into a furnace from a furnace top, wherein each ton of iron is assigned with coke of 170-200 kg;   (b) blasting pure oxygen into said furnace, wherein each ton of molten iron is blasted with oxygen of 120-200 Nm 3 , and ejecting gas that is pressured and preheated by a ball type hot blast stove into said furnace so as to directly reducing said pellet, wherein said gas is preheated to a temperature raging from 900° C. to 1150° C. and to a pressured up to 0.1-0.6 MPa; and   (c) purifying and cooling said gas produced in reducing reaction, and transmitting said gas into a residual pressure power generation device via tubes for being reused and is recovered into a gas cylinder or recycled for use.   
     
     
         2 . An equipment for blast furnace ironmaking using pure oxygen and gas, comprising: a feeding device, a blast furnace, a gravity dust collector, a ceramic tube type dust collector, a bag dust collector, a carbon dioxide pressure swing absorption device, and a residual pressure power generation device, wherein said blast furnace comprises a plurality of gas ejecting nozzle members and oxygen ejecting nozzle members provided at a periphery of a bosh thereof, and a ball type hot blast stove for preheating gas provided outside said blast furnace, wherein said ball type hot blast stove is communicated with said plurality of gas ejecting nozzle members provided at said periphery of said bosh of said blast furnace via tubes; a gas explosion-proof safety device is mounted on a tube at an outlet terminal of said ball type hot blast stove; said plurality of oxygen ejecting nozzle members provided at said bosh of said blast furnace are communicated with oxygen source via tubes. 
     
     
         3 . The process for blast furnace ironmaking using pure oxygen and gas as recited in  claim 1 , wherein put said mineral aggregate consisting of pellet, alkaline sinter, coke and solvent into said furnace from said furnace top, wherein each ton of iron is assigned with coke of 190 kg; blast pure oxygen into said furnace, wherein each ton of molten iron is blasted with oxygen of 160 Nm 3 , and eject gas that is pressured and preheated by said ball type hot blast stove into said furnace so as to directly reducing said pellet, wherein said gas is preheated to a temperature raging from 1000° C. to 1100° C. and to a pressured up to 0.3 MPa; and purify and cool said gas produced in reducing reaction, and transmit said gas into said residual pressure power generation device via tubes for being reused and is recovered into said gas cylinder or recycled for use. 
     
     
         4 . The process for blast furnace ironmaking using pure oxygen and gas as recited in  claim 1 , wherein put said mineral aggregate consisting of pellet, alkaline sinter, coke and solvent into said furnace from said furnace top, wherein each ton of iron is assigned with coke of 200 kg; blast pure oxygen into said furnace, wherein each ton of molten iron is blasted with oxygen of 190 Nm 3 , and eject gas that is pressured and preheated by said ball type hot blast stove into said furnace so as to directly reducing said pellet, wherein said gas is preheated to a temperature raging from 1000° C. to 1100° C. and to a pressured up to 0.5 MPa; and purify and cool said gas produced in reducing reaction, and transmit said gas into said residual pressure power generation device via tubes for being reused and is recovered into said gas cylinder or recycled for use.