Development and Application of Pulverized Coal Preheating Technology
Preheating of pulverized coal has the advantages of raising the initial temperature of pulverized coal,enhancing the vaporization pyrolysis process of pulverized coal before entering the tuyere,reducing PCI cooling effect on the hot blast in the tuyere area,and improving the combustion rate of pulverized coal;these advantages prompt to increasing of the coal rate.It is analyzed the technical features of some existing pulverized coal preheating technologies,such as convection preheating by BFG,electromagnetic induction preheating,preheating by silo tube-plateheat exchange,and preheating via fluidized bed.The technology of convection preheating by BFG makes full use of the waste heat of BFG and hot stove gas,and it not only can increase the initial temperature of pulverized coal,but also can save energy.The industrial test results of pulverized coal preheating technologies used in the blast furnaces of Pangang Steel vanadium Co.and Wuyang Steel show that the preheating technologies give great contribution to increasing the coal rate and reducing the coke rate,and they have bright application fu-ture.
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