(26c) Application of Pneumatic Conveying Principles to Air Pollution Control in Power Stations

As a result of government regulations, coal fired power stations in the United States are being required to reduce emissions. Many do this by use of air pollution control (APC) gas effluent treatment injection systems, with various sorbents such as lime, powdered activated carbon and trona used. One such example is hydrated lime dry sorbent injected in the flue gas ducts (trains) to reduce contaminant levels. Correctly distributing the hydrated lime to multiple trains and multiple lances is critical to ensuring the overall reduction in emission levels. The purpose of this paper is to provide an overview of pneumatic conveying system design principles from the storage silos through the pneumatic conveying lines to the lance injection ports.