PRODUCTION OF HYDROGEN-BASED SHAFT FURNACE WITHOUT OXYGEN INJECTION
During the production of Zhang Xuan Technology's hydrogen based vertical furnace without oxygen injection,due to the lack of heat supplementation from oxygen injection combustion,the inlet process gas temperature of the vertical furnace decreased by 90 ℃,the CH4 reforming effect deteriorated,the H2 and CO content in the process gas decreased significantly,the CH4 content increased significantly,the reduction ability of the process gas weakened,the reduction effect deteriorated,resulting in a decrease in DRI production,metallization rate,compressive strength,and an increase in coke oven gas consumption and DRI carbon content.By taking a series of measures,the outlet temperature of the heating furnace is increased as much as possible without triggering the chain shutdown of the heating furnace.The outlet temperature of the heating furnace is controlled to be 15 ℃ higher than that during normal oxygen injection production,and the high temperature and heat level in the reduction zone of the vertical furnace are maintained as much as possible to ensure the CH4 reforming effect;By reducing the loading and discharging speed and improving the temperature control level of the furnace top,the top temperature control has been increased by 50 ℃ compared to normal production,prolonging the residence time of raw material reduction and ensuring the reduction effect;Improve humidification rate and control DRI carbon content.Although the production of DRI has decreased,the unit consumption of coke oven gas has increased,and the smelting economy has declined,the DRI metallization rate is over 93％,the carbon content is below 4％,and the compressive strength is greater than 600 N/ball,fully meeting the blending requirements of electric furnace steelmaking.
oxygen injectionhydrogen based vertical furnaceCH4 reformingDRImetallization ratecarbon content
万方数据
维普
