Numerical Simulation of the Performance of a Channel-Steel Baffle-Type Pre-Dust Collector for Biomass Boiler Flue Gas

• • Adding a flow baffle in the ash hopper and using an upper-inlet flue duct increase collection efficiency with negligible pressure drop penalty, offering a low-resistance structural optimization path. • • Flue gas velocity is a dominant factor: efficiency drops sharply then gradually with increasing velocity, while pressure drop rises steeply; design velocity should be confined to 1.0–2.0 m·s−1 to balance performance. • • Flue gas temperature variation over tens of degrees Celsius has minimal effect: both efficiency and pressure drop decrease slightly with rising temperature, indicating robust performance under typical thermal fluctuations. • • Higher dust density and coarser particle size improve collection efficiency and reduce pressure drop, while higher dust concentration increases both; the collector is best suited for high-density, high-concentration, coarse-particle applications.