Rail Car & Truck Dumps can generate a very significant source of dust. Collecting dust from large open dump pockets is very difficult, with costs for collection systems sometimes exceeding $1,000,000. To make matters worse, users are still burdened with what to do with the collected dust once the process is completed. Chemical systems require the use of expensive chemicals and are not effective in removing dust from the air. For power plants, water and chemical sprays create a costly BTU Penalty due to the significant addition of moisture that needs to be driven off. Furthermore, sprays create large water droplets that will freeze, making wintertime operations in many regions impossible. Dry Fog Systems can effectively capture airborne dust, returning it to the dump pocket, without wetting the material. Dry Fog will not freeze and can operate in temperatures as low as –35 F.
One of the first Dry Fog Systems used at a Rollover Rail Car Dumper was for PRB Coal at Basin Electrics Laramie Station (LRS). DSI was able to achieve dust reduction in excess of 95%. This system was featured in Power Magazine in October of 2005. This same dumper is featured in the following video.