What is the role of bag filter in purifying blast furnace g...

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  • Jimmy at
  • January 22, 2019

    Blast furnace gas is a gas produced during blast furnace iron making. It is a highly toxic and low calorific value gas. The calorific value is 2800-3500KJ/m3, which is the main energy source for internal production and use of steel enterprises. It needs dust removal equipment for dust removal.

              What is the role of bag filter in purifying blast furnace gas?

    The new blast furnace gas dry dust removal equipment has many advantages such as less investment, less land occupation, lower energy consumption, high purification efficiency, simple operation and reliable operation compared with the conventional gas pressure reverse blow bag filter. Suitable for gas evolution in blast furnaces and larger capacity blast furnaces.

Process flow

    After the blast furnace gas is gravity-removed by the bag filter, it is distributed by the waste gas main pipe to each box of the bag filter and enters the waste gas room. The larger particle dust naturally settles due to gravity and enters the ash hopper of the bag filter. The smaller dust rises with the gas. After passing through the dust bag, the dust is retained on the outer surface of the dust bag, and the gas is purified. The purified gas enters the net gas chamber, and the net gas main pipe is input into the gas pipe network.


    When the temperature of the waste gas is greater than 260 ° C or lower than 100 ° C, the system will automatically close all the inlet butterfly valves, and open the waste gas release valve group. The waste gas is released, the process is undisturbed, and the furnace can be effectively controlled. Top pressure.


    As the filter process of the bag filter continues, the dust on the bag is increased, and the filtration resistance is increasing. When the resistance increases (or time) to a certain value, the electromagnetic pulse valve is activated to perform pulse jet cleaning. Gray, the blowing gas is nitrogen, and the cleaned dust falls into the ash.

    When the dust in the ash bucket accumulates to a certain amount (controlled by the level gauge or time control), the unloading ash system is started. The dust is discharged into the ash conveying pipeline through the ash discharging valve, and the dust is transported by the high pressure net gas (or nitrogen). To the big gray warehouse, and then shipped by car to the factory area.