Air Quality Control Systems and Components - Hitachi Power ...

Efficient CatalystsThe heart of the SCR process is the catalyst. Plate or honeycomb catalysts used forDeNO X systems are available. Hitachi Power Europe DeNO X systems are compatible with allcatalysts available on the markets. For each system an individual check is made as towhich catalyst results in the most efficient and most favorable system concept.Titanium dioxide-based catalysts with vanadium molybdenum and tungsten oxides areconsidered throughout the world to be state-of-the-art.The DeNO X reactor is for firmly anchoring the catalyst modules. In keeping with therequirements placed on nitrogen oxide precipitation, the number of levels is established inclose cooperation with the operator when the order is being drawn up. Catalyst modules canbe mounted on these levels. A number of them are equipped with modules and the othersserve as standby levels for any subsequent installation of additional catalyst elements.To ensure a preferably even approach flow to the catalysts, a flow rectifier is fitted above thefirst catalyst level.Flue gas flows downwards through the reactor. Dust deposits on the catalyst modules areregularly removed layer-by–layer with the aid of steam-operated sootblowers. Sonic hornscan be fitted as an alternative to sootblowers.DeNO X reactorAir Quality Control Systems 9