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Application of Needled Felt Filter Bag in Blast Furnace Gas

June 02,2023

The application of needle felt filter bags in blast furnace gas is mainly used for dust removal treatment of blast furnace gas. Blast furnace gas is the gas generated during the combustion process in the blast furnace, which contains a large amount of coal dust and particulate matter. It needs to be treated through dust removal equipment to ensure that the gas emissions meet environmental requirements.

Needle felt filter bagsare a common filtering material with high filtration efficiency and good heat resistance, therefore they are widely used in the dust removal system of blast furnace gas. Its working principle is to intercept the particles in the gas on the surface through the fiber mesh structure of the needle felt, so that the gas can be purified after passing through.

In the application of blast furnace gas, needle punched felt filter bags need to have certain characteristics and performance, including:

High temperature resistance: The temperature of blast furnace gas is relatively high, usually in the hundreds of degrees Celsius or even higher. Therefore, needle punched felt filter bags need to have good high temperature resistance to ensure that they do not deform or melt in high temperature environments.

High filtration efficiency: Needle felt filter bags need to have efficient filtration performance, which can effectively intercept particulate matter in gas and ensure that the discharged gas meets environmental requirements.

Corrosion resistance: Blast furnace gas may contain some corrosive substances, and needle felt filter bags need to have certain corrosion resistance to ensure long-term stable service life.

Tensile strength and wear resistance: Due to the large number of particles in blast furnace gas, needle felt filter bags need to have sufficient tensile strength and wear resistance to ensure that they are not easily damaged during use.

Overall,needle punched felt filter bagsplay an important role in dust removal in the application of blast furnace gas, effectively purifying the gas and reducing environmental pollution. At the same time, the material selection and performance of the needle felt filter bag should comply with the working conditions and requirements of blast furnace gas to ensure stability and reliability.


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