Recuperative catalytic oxidizer for VOC and NOx reduction Hitachi Power

NOx control systems (DeNOx)

Lowering NOx levels with selective catalytic reduction
Modern power plants reduce emissions to a minimum. For instance, the SCR is deployed following combustion to minimize nitrogen oxide emissions. This modern process produces nitrogen and water vapor; the nitrogen oxides are practically 100% removed.

The SCR technology is used preferably between economizer and air heater since it is here that it can best be operationally incorporated into the overall power plant picture.

HPE provides this DeNOx technology with the delivery of utility steam generators for firing coal.

The main units of a DeNOx plant are:

Ammonia /ammonium hydroxide storage and supply
Ammonia /ammonium hydroxide injection and blender systems
DeNOx reactor with rectifier and sootblower
Catalysts

HPE supplies this units as part of a turn-key installation.

The heart of the process is the catalyst. Plate or honeycomb catalysts are available for deployment in DeNOx systems. All the catalysts on the market can be used in our systems.

Special importance for proper and optimum catalyst operation is attached to ammonia and/or ammonium hydroxide injection and the blender system. The ideal requirements here are created by the static blender system used by HPE with a form of ammonia injection adapted to this blender system.