Enhancing Conveyor Dust Control: Strategies and Safety Measures for Effective Airborne Particle Management
Conveyor loading zones and discharge points are significant sources of airborne dust emissions. Various systems exist to control airborne dust at these points. The selection of an appropriate system depends on factors such as the type of material conveyed, drop height onto the belt, and the speed and angle of loading and unloading belts. Passive dust-control systems, which do not require external supplies like electricity or water, are often chosen based on conveyor and material characteristics.
One passive method involves installing dust-collector filter bags. These bags are effective for capturing dust without needing a central collection system. Typically, they feature a filter bag stretched over an open port in the skirted section of the conveyor. Positive air pressure is relieved through these bags, capturing dust inside. Depending on airflow and bag permeability, multiple bags may be necessary at transfer points.
To prevent damage from environmental factors like rain or snow, it's advisable to house these bags in protective shelters. Each dust bag has a specific airflow capacity determined by its material permeability and surface area. For optimal performance, bags are usually placed approximately one-third down the length of the transfer chute from the loading zone. Dust curtains installed alongside the bags help regulate airflow, directing more air through the filters.
Static electricity is a concern with dust bags, especially in potentially explosive environments. Manufacturers incorporate technologies like stainless steel grids or conductive carbon fibers into the bag fabric to dissipate static charges safely.
Additionally, dust bags integrated into skirtboard covers are sized to handle specific airflow rates at transfer points. These bags are equipped with static-dissipation technology and use suitable fabric based on the handled material. Sizing a dust bag involves calculating the required airflow, applying safety factors, selecting appropriate filter media, and ensuring static-dissipating capabilities. Safety protocols, including lockout/tagout procedures, are essential during maintenance to mitigate risks of dust explosions or health hazards associated with collected dust.