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Since 1996, IVITAS has been strictly fo-cused on design, construction and consultingservices for the power generation industry.They constantly and consistently gain knowl-edge on cutting edge technology around theworld and develop their own technology andprocesses to achieve efficient, cost optimizedprojects for steam and hot water boilers, elec-tric power plant boilers, heating plants and in-dustrial facilities.

Upcoming EU emission regulations affectcompanies of all sizes

New NOx emission regulations recentlyapproved by the EU will come into effect on1 January 2016. These changes will affect manycompanies throughout the Czech Republic, in-cluding the largest power plant in the Silesianregion, Elektrarna Detmarovice. The Silesianpower plant produces electricity through theburning of coal and has an installed capacity of800 MWe (4 x 200 MWe). For close to 40 years,improvements in its production processes hadbeen carried out to reduce emissions, but thenew EU guidelines made a radical renovationnecessary.

The right solution for Elektrarna Detmarovice The EPC contractor selected IVITAS as the

preferred designer for this project due to itswell-known technical expertise in regard toboilers and boiler plants. Design work began inlate 2013 with IVITAS contributing its know-how in the same capacity as it had done duringthe earlier comprehensive renewal of theTusimice II and Prunerov II power plants. It wasgiven the task of designing and implementingprimary combustion measures for the realiza-tion of denitrification of the K3 and K4 blockswith a total output of 400 MWe. IVITAS wasalso asked to provide a conceptual solution forflue gas ducts and implementation of the SCRreactor for the project.

IVITAS takes part in introducing SCR techno-logy to the Czech Republic

To achieve the maximum reduction of NOx

emissions, SCR technology was chosen as themost appropriate supplement to the proposedprimary combustion measures. This technolo-gy delivers a mixture of NH3 and H2O into theflue gas, which causes subsequent reactionson the catalyst layers in the reactor enclosureto maximize reduction of NOx emissions. Thesystem is located behind the second pass ofthe boiler. Ducts and the reactor housing were

IVITAS realizes first ever SCR (Selective Catalytic Reduction) reactor in the Czech RepublicIVITAS recently utilized their extensive knowledge and expertise in power generation to implement an SCR reactor in a coal fired powerplant. Located at the Detmarovice facility, which is operated by CEZ (the largest electricity producer in the Czech Republic), it is thefirst of its kind in the Czech Republic.

SCR Reactor – Complete diagram of the SCR reactor design

Project implementation: Suspension of the respective economizer sections

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designed to reside outside the boiler room and were positioned abovethe Ljungström type regenerative air preheater.

The uniquely designed, independent SCR reactor housing is 18 me-ters high and operates as a reactor exhaust pipe with an inside diameterof 14 x 7 meters. The housing is supported by a specially designed girdergrid system. The flue gas mixture from the reactor housing is deliveredvia a split channel to a Ljungström type regenerative air pre-heater. Eachindividual part is connected by a woven expansion joint, which enablesthermal movements.

After raising the height of the channel, three additional girder gridswere realized to support the catalytic layers, suspended economizer sectionand air heater. An under slung overhead crane was located below thesecond and third girder grid for manipulating the catalytic convertermodules.

The total weight of the steel structure is 200 tons and the SCR tech-nology weighs approximately 380 tons. Both are located on each 200MWe unit.

Computer modelling of the SCR ReactorThe structure was comprehensively stress tested using unsteady

temperature loads and results were implemented into the constructionof the reactor housing. Testing included temperatures and temperaturegradients experienced during normal operation, start-up and shutdownof the unit. The finite element method (FEM) was used for global struc-tural analysis of the SCR reactor and duct.

IVITAS validates its industry-leading expertise in power generationIVITAS has once again proven its experience, knowledge and ver-

satility in the design and implementation of energy generationprocesses and facilities. EPC contractors, power generation and heatingcompanies can all place their trust in IVITAS thanks to its focus on op-timization of combustion projects and development of specialized tech-nologies for energy and civil construction. From design to basic struc-tural analysis to realization of workshop documentation, IVITAS pro-vides comprehensive, professional services for both domestic and in-ternational clients.

To receive an initial consultation for your next power genera-tion project, contact the IVITAS professionals at + 420 597 317 317 orivitas@ivitas.cz.

Ing. Radim Seidler, Designer, Boiler Design Department,

IVITAS, a.s.

Project implementation: Realization of the girder grid’s lowest level

Project implementation: Suspension of the respective economizer sections

Diagram of the SCR Reactor housing and related flue gas ducts