BETE Spray Nozzles For NOX Removal (SCR/SNCR)

Nitrous oxides (NOx) are formed by combustion in high-temperature environments, such as power plants and large diesel engines. NOx causes air pollution by reacting with air in UV light from sunlight to form ozone, the primary component of smog. Therefore, it is crucial to limit NOx emissions in applications that produce large quantities of these gases.

Spray Lances, Injectors, & Quills

In both selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR), spray nozzles are used to inject a reagent or series of reagents into the exhaust gas to combine and react with the gas (and potentially a catalyst) to remove NOx from emissions. SCR uses ammonia as the reagent, while SNCR uses ammonia or urea injected at a high temperature.

BETE spray nozzles maximize efficiency in SCR/SNCR injection applications. They atomize and distribute the reagent into the process stream, which increases the reaction surface area that combines and reacts with the NOx. Spray nozzles coupled with BETE injection lances can distribute the reagents as evenly as possible within the process stream to ensure proper mixing and minimize bypass.

Common Uses and Industries

• SCR/SNCR applications typically occur at high temperatures
• Particulate in the gas stream has the potential to clog injection nozzles and catalysts
• Injection lances may need to be designed to prevent flashing of the spray media before the nozzles or with protective / purge shrouds to prevent a build-up

Process gas flow rates and velocities