Study on Additive of Pulverized Coal in Blast Furnace by Thermogravimetry

The effects of nine kinds of additives on combustion characteristics of pulverized coal were studied by thermogravimetry method.The combustion efficiency under different temperatures,the intense combustion starting temperature and the maximum reaction rate of the coal samples with different additives were analyzed by thermogravimetric and differential thermogravimetric curves.Their average combustion rates were studied by TG fitting curves.On the basis of the above analysis,the comprehensive combustion performance of No.5 coal samples with additive was superior to raw coal without any additive.Compared with the raw coal,the intense combustion starting temperature of No.5 coal sample was decreased by 14℃,the combustion efficiency under 600℃ was increased by 11.94% and the average combustion rate increased by 8.7%.So it was considered that the additive added into No.5 coal sample could be used as combustion-supporting agent of pulverized coal.