DSI Impacts on Visual Opacity

Authors:
Anthony A. Silva and Robert E. Snyder
Babcock & Wilcox Power Generation Group, Inc.  (Ohio, U.S.A.)

Presented at:
Power Plant Pollutant Control "MEGA" Symposium (Maryland, U.S.A.)

Abstract:
Brown plume (visual opacity) formation from sodium-based dry sorbent injection (DSI) systems has been observed when mitigating sulfur dioxide (SO2) in high SO2 and nitrogen oxides (NOx) streams using fabric filter technology. Brown plumes are normally a sign of excess nitrogen dioxide (NO2) in the gas stream. Since DSI is a leading technology in controlling pollutants for the EPA’s Mercury and Air Toxics Standards (MATS), Industrial Boiler Maximum Achievable Control Technology (IBMACT), and other state or local laws, predicting the potential of brown plume formation may determine the viability of DSI for a particular site. Case studies of plants and pilot studies which have NO2 formation from native NO by sodium-based DSI will be examined, as well as determining a methodology to predict potential visual opacity issues.

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