Divertersofanew generationand exhaustgassystems ... · drive shaft free of bending stress ... sometimes even fabricated by welding two U- ... WHRU’s of off-shore generator plants

A LEADER IN DAMPER TECHNOLOGIES

PERFECT DAMPER TECHNOLOGIES FOR INDUSTRIAL PLANTS

Diverters of a newgeneration andexhaust gas systemsfor combined cyclepower stations


Technology lead throughpatented innovations

1 Blade with lattice support structure and free floating, cardanically attached diaphragm cover plates –no heat distortion – reduced weight

2 Nicroflex-Hiperform seals –high resilience as well as stability during modulating service

3 Twin toggle lever actuation –provides for 180 degrees rotary movement with optimal utilisation of the toggle lever kinematic –lower actuating forces-only one cylinder each side required –drive shaft free of bending stress

4 Diverter drive shaft and integral levers –designed as lattice structure –no heat distortion-reducedloss of free damper area –lower weight

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RAUMAG-JANICH has developed and patented a newdiverter blade design for combined cycle gas turbineplants, although the design is also suitable for other hightemperature applications. It has proved itself already in awide variety of installations. By means of computer simu-lations it’s behaviour under varying service conditions isexactly predictable in advance. In combination withthe new NICROFLEX-HIPERFORM DBP, sealingsystem distinguished by it’s high resilience andstability when exposed to high gas velocities, thisdesign concept provides, especially for verylarge damper dimensions, an advantageoussolution.The illustrations depict the design ofthe lattice support structure of adiverter blade for a gas turbinepower plant.

The patented lattice structuresupported Diverter blade

Two cover plates are fitted upon this structure by methods whichpermit them to expand and contract in all directions when heatingup and thus avert any distortions. The hot gas flows freely throughthe lattice structure so that the temperature of its members changeevenly and no deformations occur irrespective of the speed withwhich the temperature changes take place.The blade may be equipped with single or double sided thermallagging in order to reduce heat transfer into the closed downsection of the plant.

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The Nicroflex-Hiperform sealingsystem, protected by world widepatents

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Specially intended for large shut-off dampers and divertersfor combined cycle gas turbine power stations, RAUMAG-JANICH developed the new NICROFLEX-HIPERFORMsealing system.

Geometrically circular metal loop sealing elements afford apermanently high resilience of 30 mm, and more withenlarged loops. This facilitates the neutralisation of certainmisalignments or heat expansion of very large damperblades.

In uncompressed condition (damper open) the internalvee-shaped stabiliser bars provide the loops with additio-nal lateral strength. (illustration above)

The seal element is free of high metal stress points whichnormally appear when stainless steel seals are subject tocant operations in the course of their fabrication. Suchoperations are unnecessary in manufacturing the circularseals. Due to this they will be able to better withstanddamage or destruction as a result of high gas velocities,vibrations or severe turbulences.Reliable gas flow modulation during boiler start up is alsopossible without negative effects on the seal.

Illustration below: In compressed condition (damperclosed) a wide area of contact is created between sealand mating surface which provides a very good initialtightness. The loop flattens and two semicircular shapedbulges extend sideways on both sides which provide theseal with strength to withstand high gas pressure.The internal vee-shaped stabilizer also acts as anend stop limiting seal compression and preventing itsunintended overdeformation.

The seals resilience can be easily adjusted to suit actualconditions by simply inserting one or more back up barsinto the loop.

Even deformations by point loads (tramp material) areneutralized by the seal which regains contact with itsmating surface within a very short distance.

With a single set of seals of this type the area equivalentdamper thightness is 99,98%.With double seals and seal air a 100% tight, man safeshut-off is accomplished.


The external dual toggle leveractuation (Patents applied)

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RAUMAG-JANICH has developed a unique new externaldual toggle lever actuation method for diverters whichprovides for a turning angle of 180 degrees. This offers anumber of advantages for the damper operation and itsreliable function.Large sized diverters are designed with an internal togglelever system. With this it is of advantage to apply theactuation forces at the blade centre in order to obtainsymmetrical loads on the blade and its seals. Also, in theblade end positions, when the blade is subjected to thehighest differential pressure and the seals make contactwith the landing bars, the toggle lever system provides foran effective conversion of drive torque into high closingforce.

Hydraulic cylinders acting with single or double levers can,on account of the geometry of the lever system, attainonly relatively small turning angles. To overcome this, theposition of the main drive shaft is usually shifted towardsthe pivoting point of the blade. This however, results in aninsufficient utilisation of the internal toggle lever system inthe end positions of the blade when the acting differentialpressure is greatest and the seals are pressed down firmlyonto the landing bars. Consequently, the cylinders have tobe dimensioned for higher forces. The required torque inthe end positions is also higher. Generally, the whole drivesystem will have to cope with heavier loads.

The new dual toggle lever actuation method attainsa 180 degrees turning angle, it facilitates the optimalutilisation of the internal lever system and thereforerequires lower actuating forces. For these reasons,only one cylinder each side is required for the diver-ter operation.

Electric actuationDIVERTERS requi-ring no modulatingoperations oremergency func-tion are equippedwith multiturn elec-tric actuators.

The illustration onthe right depicts atypical actuatorarrangement.

Picture below:dual toggle lever actuation arrangement for aDIVERTER, ND 5600 x 5600 mm

Latticed girder actuating mechanism(Patents applied)

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A new development of RAUMAG-JANICH is thelattice girder actuating mechanism for diverters.

This design supersedes the usually used heavy walledtubes, sometimes even fabricated by welding two U-shaped sections together. This causes a considerableloss of free damper area. Furthermore, on opening thebypass, the tube is temporarily exposed to high tem-perature gas flowing predominately from one directionas well as the release of welding stresses, both ofwhich cause distortion of the hollow section.

The lattice girder design averts all those disadvanta-ges. The high temperature gas flows freely throughthe lattice structure so that all its members heat upevenly with the result that heat distortion is completelyabsent. Not only is the loss of free damper area lowerbut the component weight is also reduced to aminimum.

The picture below depicts the lattice girder actuatingmechanism of a DIVERTER, ND 5600 x 5600 mm.



Externally positioned sphericalsleeve bearings supportthe drive shaft

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The main diverter drive shaft is sup-ported by externally positioned, main-tenance free, spherical sleeve bearingsfitted into dust tight casings. Neither themedium nor the plant environment canharmfully effect them in any way.The large, specially coated, sphericalbearing surfaces prevent damage orstiff movement in the presence ofsevere vibrations. The passages of theshafts through the casing are sealed bypacking glands with internal supportrings.

Dampers with double seals in conjunc-tion with seal air injection between thetwo sealing planes attain a 100% tight,man safe, shut-off. The seal air pressureneeds to be higher than the pressure ofthe flue gas. This type of system corre-sponds to UVV.In order to prevent gas leakage into ashut-off section in case of a seal airfan breakdown a standby facility isprovided.

The illustration depicts a typicalarrangement of the seal air fans.

The seal air system with standby facility


DIVERTERS for combined cycle gasturbine power stations

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Pictures above, on the left and right: fabrication anderection of a diverter, ND 5600 x 5600 mm, includinga blanking plate guillotine.Based upon an order received from Nooter-Eriksentwo diverters, ND 3900 x 3900 mm and one diverter,ND 5600 x 5600 mm have been supplied to thepower station Qarn-Alam at Oman.

Picture on the left:6 diverters, ND 3048 x 3048 mm have been suppliedto the largest Russian combined cycle power stationat Moscow on the strength of an order receivedfrom Zorlu Energy.

Picture on the left below:Diverter, ND 5020 x 4640 mm for the extension of thecombined cycle power station at Linz, Austria.

Picture below, right:Diverter, ND 2000 x 6000 mm, for Degussa’scombined cycle power station at Antwerp.

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Picture on the right:Based upon an order received from GamaBoiler for the combined cycle powerstations at Entek and Ostim Turkey,RAUMAG-JANICH supplied the diverters,ND 3150 x 3150 mm, the diffusers,the blanking plates and flexible joints.

Picture above: if required, RAUMAG-JANICH provides supervisors duringerection.

Picture below: RAUMAG-JANICH securedan order for the supply of 3 diverters, ND3048 x 3048 mm, for the combined cyclepower station Kayseri Turkey. The diverterswere made entirelyof heat resisting stainlesssteel.

Picture above: depicted is a lattice structure supported blade withthermal lagging on both sides for a diverter, ND 3050 x 3050 mm


DIVERTERS for Off-Shoreinstallations

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RAUMAG-JANICH developed divertersspecially for off-shore service.In view of the operating conditions casingand all internals are made of stainless steel.The diverters are powered by hydraulic orpneumatic systems with accumulators foremergency operation in case of power failure.The design incorporates the proven latticestructure blade concept. The NICROFLEX-HIPERFORM sealing system permits gas flowmodulation in all positions.

Picture left and on theright below: depict anew, also patented, sea-ling arrangement withwhich a 100% tight shut-off is accomplished byusing only a single sealsystem. On account ofthe broad contactsurface created when thedamper is closed it ispossible to effect a shut-off by creating two sea-ling surfaces.Gas leakage is preven-ted, as usual by theinjection of seal air. Thismethod is of specialadvantage for off-shorediverters.

Picture on the left:Based on an order received fromAlstom EnergySystems UK, RAUMAG-JANICH designedand supplied 10 tandem dampers, ND 3200 x3200 mm, for shut-off and modulating servicefor the gas turbines of the world’s largest lique-fied natural gas plant Snovit operated byStatoil at Hammerfest.Decisive for the order award to RAUMAG-JANICH were the innovating techniques deve-loped during the last few years. Of particularimportance was the proposed solution formodulating the gas flow in view of the extremeoperating and climatic conditions .

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lattice supporteddamper blade

RAUMAG-JANICH secured an order fromKANFA-TECfor the design and supply of diverters destined for theWHRU’s of off-shore generator plants in the Barents sea.They were made completely of heat resisting stainlesssteel and of a special design developed by RAUMAG-JANICH for such applications. Apart from the high ex-haust gas temperature the local outside temperature ofminus 46 degrees C. had to be taken into consideration.

Picture below and right: If required RAUMAG-JANICHdoes supply diverter type dampers with louver type bla-des. The lattice frame supported single shroud bladedesign minimizes the pressure drop across damper.High temperature gas flows freely through the supportframe with all members heating up evenly. Thereforeheat distortion is completely averted. (Off-shore plantAlvheim, Norway).

Picture above: RAUMAG-JANICH supplied to AlstomEnergy Systems UK for the Statoil operated Siri off-shore plant a diverter, ND 2100 x 2100 mm.



BYPASS-Systems for combinedcycle gas turbine power stations

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RAUMAG-JANICH also designs and suppliescomplete bypass systems for gas turbine plants.Core part of the system is the proven diverter withits lattice structure supported single blade designand the patented, highly resilient NICROFLEX-HIPERFORM sealing system. All parts are equippedwith internal insulation. All system components canbe designed to suit the respective gas turbine framesize. The diverters are powered by pneumatic orhydraulic drivers.During turbine start up it may be used for boiler gasflow modulation. With double seal and seal airinjection a 100% gastight, man safe shut-off isaccomplished.If required, an additional planking plate guillotine issupplied.

wasteheat recoveryboiler with stack andsteam turbine

gas turbine with generatorand air intake

bypass system

bypass stackwith internalinsulation

sound attenuator

Blanking plateGuillotine for boilermaintenance work

stack support structure

diverter for flowdirection controland gas flowmodulation

diffuser

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Picture above: view of the combined cycle powerstation Entek, Turkey with the bypass system in thecentre.

Double Bypass Systems

Diverter with bypass system during erection at Ostimpower station in Turkey with a RAUMAG-JANICHsupervisor in attendance

The illustration above depicts schema-tically the complete combined cyclepower station at Bielefeld.

The illustration on the left depicts thedouble bypass system supplied byRAUMAG-JANICH to Bertsch,Austria for the combined cyclepower station at Bielefeld.The exhaust gases of two gas turbi-nes, type Titan 130, pass throughseparate bypass ducts and are thencarried to one common waste heatrecovery boiler. (WHRB)


Special dampers for combinedcycle plants

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Picture above:Blanking plate guillotine,ND 3050 x3050 mm for the Entek power station.

Picture on the right and left:Patented shut-off and gas modulationsystem, ND 600 x 17500 mm, for the com-bined cycle power station at Bitterfeld.This damper serves to either shut-off theintegrated boiler bypass or for gas flowmodulation towards it. Covering a blade spanof 17500 mm was made possible by usingthe new, patented lattice structure supportedblade design. The blades are made up of17500 mm long latticed girders upon whichfree floating cover plates are fitted.TheNICROFLEX-HIPERFORM seals highresilience guarantee a tight closure of the bla-des. In open position and high velocity, hightemperature gas flow, the suitably stabilisedsealing elements permit trouble free modula-ting operations.The system operates at tem-peratures of up to 700 degrees C. Even atsuch conditions no blade distortion hasbeen observed.

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Special dampers for combinedcycle plants

Picture above:Stack damper, ND 7000 mm dia supplied toBALKCE-DÜRR, Austria for the HRSG unit atKastroe plant, Norway.

The damper is electrically operated and opens auto-matically by means of counterweights if a certain, presetduct pressure is exceeded. (emergency function)

Picture below:4-Way damper, ND 2500 mm dia. for a dieselgenerator plant in Turkey.

Stack damper, ND 5400 x 5400 mm,supplied for the exhaust stack of a gas turbine plant. It issuspended into the stack in a way which leaves its sup-port structure uninterrupted.The damper blades are closed by manual actuator. Incase of power failure or upon exceeding a duct pressureof 150 mbar the blades open automatically to protect theplant.When closed the damper prevents the ingress of rainwater into stack and silencer below it.



Special purpose dampers for

� Power stations� Gasturbine plants� Off-Shore-Installations� Flue gas desulphurisationplants

� Flue gas denitrificationplants

� Cement plants� Steel smelters� Waste heat recovery plants� Garbage incinerating plants� Chemical processindustries

� Other industrial plants

RAUMAG-JANICH – Perfect technique, Quality and Security

RAUMAG JANICH-SystemtechnikGmbHIm Grund 696528 Rauenstein/ ThüringenTelefon: 0049 36766 881-0Fax: 0049 36766 81032Mail: [email protected]: www.raumag-janich.de

RAUMAG JANICH-SystemtechnikGmbHZweigniederlassung BeckumKirchstrasse 959269 BeckumTelefon: 0049 2525 4141Fax: 0049 2525 6332Mail: [email protected]

Shut-off and modulationdampers

� Shut-off dampers, of roundor rectangular configuration

� Shut-off dampers of hightightness, 99,98% minimum

� Double-shut off dampers,with seal air 100% gastightto UVV

� Tandem dampers, costeconomic alternative to doubleshut-off damper, with seal air100% gastight to UVV

� High efficiency louverdampers, for modulation orshut-off.

� Double louver dampers, withseal air 100% gastight to UVV

� Tandem louver dampers,cost economic and spacesaving alternative to Doublelouver dampers, with seal air100% gastight to UVV

� Lever flap dampers, alsowith double sealing and sealair, 100% gastight to UVV

� Diverter dampers, with doublesealing and seal air, 100%gastight to UVV

� Emergency dampers, fastopening or closing, also on lossof energy

� Stack dampers, also withemergency features

� RK10 sandwich dampers,for fitting between existingflanges

� Dopex shut-off valves� Toggle disc valves, DVGW

approved, as shut-off oremergency dampers

� Hot gas valves, also air orwater cooled

Isolators

� Guillotine dampers for FGDplants. 100% gastight to UVV

� High efficiency guillotinedampers

� Guillotine dampers, withdouble sealing and seal air100% gastight to UVV

� Sickle isolator, 100% gastightto UVV

� Goggle valves, DVGWapproved, 100% gastight toUVV

� High temperature isolators,with or without internal laggingor refractory lining

� High temperature isolators,with air or water cooling

Service and maintenance

� Professional maintenanceof flue gas modulation andshut-off-dampers

� Conversion and modernising of existing flue gasmodu-lation and shut-off dampers

� Upgrading of obsoletesealing systems andoperating systems

Fabrication for industrialmachinery and processindustries� Cooler for dusty bulk materials� Fabricated, welded compo-

nents made of steel andstainless steel, also machinedif required

� Boltless wear liners for cyclo-nes and air separators etc.

Large, tailor designed dam-pers for Gasturbine plants

� Diverter for the isolation, rerou-ting and modulation of the turbi-ne exhaust gas. With doubleseals and seal air 100% gastightin terms of UVV regulations.

� Diverter for gasturbine-off-shoreplants, designed to meet thespecific service requirements.

� Flap dampers, also for modu-lating operations, with seal air,100% gastight in terms of UVVregulations.

� Louver and� double louver dampers for

modulating service and shut-off.� Stack caps, also as� emergency dampers.� Blanking plate Guillotines for

combined cycle plants, also withdouble seals and seal air for100% gastight shut-off in termsof UVV regulations.

� Flexible joints for combinedcycle plants.

Documents

Divertersofanew generationand exhaustgassystems ... · drive shaft free of bending stress ... sometimes even fabricated by welding two U- ... WHRU’s of off-shore generator plants