中天钢铁南厂区180m^2烧结1号厚料层低负压点火实践

LOW NEGATIVE PRESSURE IGNITION PRACTICE FOR1#THICK SINTERING LAYER OF 180m^2 IN ZENITHSTEEL SOUTH FACTORY

降低烧结能耗是烧结工作者的追求目标,点火消耗占据烧结工序能耗的约5%。中天南产区180 m^2烧结机采用高炉煤气点火,煤气消耗在38.15 m^3/t水平。为了降低高炉煤气消耗,针对180 m^2开展了低负压点火改造实践,采取了点火器适当前移、一号风箱封堵、等措施;同时配合了料层厚度从800 mm提高900 mm水平。改造后:前3风箱负压由-14.25、-14.23、-14.16 kPa降低到-2.90、-9.23、-7.20 kPa,烧结过程风量得到了优化分配,烧结终点温度由385.26℃提升到398.18℃,烧结矿质量得到一定程度提升,转鼓强度由77.89提升至78.26,筛分指数由4.84降低到4.77,高炉(5~10 mm)的入炉合格率由77.02%提升到80.97%;烧结过程工序能耗得到了一定程度降低,煤气单耗由38.15 m^3/t降低到32.36 m^3/t,高炉煤气消耗由250000 m^3/d降至225000 m^3/d,燃耗由56.26 kg/t降至55.42 kg/t,电耗由37.05 kWh/t降低到35.46 kWh/t。

Reduction of sintering energy consumption is the goal of sintering workers.Ignition consumption accounts for about 5% of sintering process energy consumption.The 180 m^2 sintering machine in Zenith Steel company south region is fired by blast furnace gas,and gas consumption was at 38.15 m^3/t.In order to reduce the consumption of blast furnace gas,low negative pressure ignition transformation was carried out,we carried out some measures such as appropriate forward movement of igniter,sealing of no.1 bellows,Meanwhile,we also increased the thickness of material layer from 800 mm to 900 mm.After modification:the negative pressure of the first 3 bellows decreased from-14.25 kPa,-14.23 kPa and-14.16 kPa to-2.90 kPa,-9.23 kPa and-7.20 kPa,The air volume of sintering process is optimized,The sintering terminal temperature increased from 385.26℃ to 398.18℃,The quality of sinter is improved to some extent:drum strength increased from 77.89 to 78.26,screening index decreased from 4.84 to 4.77,qualified rate of blast furnace(5~10 mm)is raised from 77.02% to 80.97%.The energy consumption of sintering process is also reduced to some extent:gas consumption decreased from 38.15 m^3/t to 32.36 m^3/t,consumption of blast furnace gas decreased from 250,000 m^3/day to 225,000 m^3/day,fuel consumption decreased from 56.26 kg/t to 55.42 kg/t,power consumption decreased from 37.05 kWh/t to 35.46 kWh/t.