Demonstration of the BW PGG / GEA Niro SDA Peak Control System

摘要

Performance of the well-proven spray dryer absorption (SDA) process for the control of acid gas and hazardous air pollutant (HAP) emissions in coal-fired boiler applications can be enhanced by the addition of dry hydrated lime to the process. This peak control process modification has been used by GEA Niro in European energy-from-waste applications. SDA performance with dry lime addition for enhanced emissions control on cold boiler startup was demonstrated at the nominal 110 MW Wygen 3 - Unit #5 in Wyoming. This approach was also used to demonstrate the potential to increase sulfur dioxide (SO_2) removal to address the impact of increasing fuel sulfur in combination with a pending reduction in the regulated emission level for an installation in the Czech Republic. System responsiveness, SO_2 emissions, and impacts on auxiliary systems from both sites are addressed in this paper.