Efforts to remove NOx through the use of SCR technology have resulted in increased sulfur trioxide (SO3) concentrations in the flue gas stream of fossil fuel-fired utility boilers.
When these flue gases are treated in a wet flue gas desulfurization system, the potential exists for a sulfuric acid (H2SO4) vapor, sometimes visible as a blue plume, to occur.
B&W can develop cost-effective solutions for SO3 mitigation by utilizing an overall system approach to optimize the size and cost of such systems.
When determining design requirements, consideration of SO3/H2SO4 formation and capture includes extensive evaluation of the following areas:
- Fuel selection
- Boiler operation
- Selection of SCR catalyst
- Optimizing air heater design and operation
- Utilization of sorbent injection technology
- H2SO4 capture in particulate removal devices (such as an electrostatic precipitator or baghouse)
- H2SO4 capture across the Wet FGD
One such solution is sorbent injection. B&W provides a trona injection technology through a license with AEP ProServ, Inc. a subsidiary of American Electric Power. This sorbent injection system can cost-effectively mitigate SO3, reducing visible stack emissions due to H2SO4. The technology is successfully installed and operating.
For more information, please contact us.
Trona injection system
