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

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Nitrogen Oxide Reduction (DeNO X )Coal Power PlantWalsum 10Reduced to a MinimumThe major elementsof a DeNO X system are:■ Ammonia / ammonium hydroxidestorage and supply■ Ammonia / ammonium hydroxidespray–in and mixer systems■ DeNO X reactor with rectifierand sootblower■ CatalystsIn the case of secondary measures to reduce nitrogen oxides (DeNO X ), progressive plantconstructors, such as Hitachi Power Europe, make use of selective catalytic reduction (SCR).This up-to-date process ensures that nitrogen emissions are cut to a minimum.Arising from a combination of ammonia and precipitated nitrogen oxide are the air constituentsof nitrogen and water vapor. Almost complete removal occurs of the nitrogen oxides generatedduring combustion.In modern plants the SCR technology is installed upstream of the air heater, although underapplications seldom met with it can be used downstream of the flue gas scrubber. Deploymentupstream of the air heater is tantamount to optimal integration into the overall process of apower plant from the process and resources-conservation angle. In both instances,considerable allowance is made for Hitachi know-how - as both a boiler manufacturer andFGD plant constructor – in incorporating SCR technology into the power plant process.8
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
Page 2 and 3: Hitachi Power EuropeFrom Coal to El
Page 4 and 5: Experience and Competence in Enviro
Page 6 and 7: Flue Gas DesulphurizationWell withi
Page 10 and 11: Mercury ReductionAlways One Step Ah
Page 12 and 13: CO 2 CapturePost-combustion Capture
Page 14 and 15: Post Carbon Capture Plant Integrati
Page 16: © Hitachi Power Europe GmbH /06.20

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

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