The craft reformation of the blast furnace coal injection in China has been developing towards a compact, practical and economical trend, which leads to higher level, more capacity, but less investment.

Practice on PCI gas supply system's improving and producing;

It is useful for diagnosing coal combustion status and supervision running state to study on temperature-field of the tuyere and raceway in blast furnace,at the same time,it is also helpful for supervising the structure of oxygen and coal burning apparatus,improving coal combustion technology and coal injection operation.

The coal injection system of No.

This paper especially introduces the design and application of high low pressure long bag impulse precipitator in 1 750 m3 BF coal injection system in Jinan iron and steel group,and further expounds the structure,working principle,firing and explosion prevention and automatic control of the precipitator.