The pulverized coal transport filter in steel mills is a critical protective device in the blast furnace coal injection system. It is primarily used to filter impurities in the coal powder (such as wood chips, fibers, and large particles) to prevent clogging of downstream components like distributors and spray guns, ensuring the continuous and stable operation of pneumatic coal powder transport. Its installation location and operational maintenance points
Installation Location
Must be positioned after the air supplement regulator at the outlet of the injection tank and before the distributor, forming a "regulator → filter → distributor" process flow.
Install on horizontal pipelines to avoid powder accumulation in vertical sections.
Maintenance Requirements
Regular Slag Removal: Inspect slag buildup on the filter plate each shift to prevent pipeline pressure buildup caused by increased differential pressure.
Filter Plate Replacement: The service life of wear-resistant manganese steel filter plates is approximately 6-12 months; replace promptly if wear exceeds tolerance.
Fault Contingency: A dual-filter parallel design allows for "one in use, one on standby," enabling slag removal without interrupting coal injection.

Selection and Manufacturer Recommendations
Selection Basis: Match models based on pipe diameter (mainly DN100/DN125), system pressure (≥1.6 MPa), and wear resistance requirements (preferably ceramic-lined).
Main Manufacturers:
Shandong Jinglan (DN100 PN2.5 carbon steel filter)
Beijing Lanhao (conical filter, suitable for dense-phase transport)
Xiangye Environmental Protection (double-cone wear-resistant design)
Precautions: Avoid ball-type filters (prone to throat clogging); prioritize cone-type designs without throats. Steel mills in northern regions require anti-freeze insulation to prevent coal powder moisture condensation and hardening.