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• W2517111569 abstract "The combustion of sulphurous fuels leads to high sulphur dioxide (SO 2 ) emissions. Modern lignite- and hard coal-fired power stations require a flue gas desulphurisation plant (FGD) to meet the current emission regulations. The mostly used FGD in large-scale power plants is the wet scrubber where limestone slurry is used as washing liquid. In many cases the FGD consists of a cylindrical absorber and a radial raw gas duct. Several spray banks are installed in the cylindrical part of the absorber. The limestone slurry is atomized by an array of nozzles which are fed by the spraybank piping. Main target of the atomization process is to gain a large mass-transfer area in the spray. SO? from the flue gas is absorbed into these spray-droplets where it is bonded as calcium sulphite. Further it is oxidised to gypsum. Since the mid of the nineties it is well known that the efficiency of wet scrubbers is affected by the fluid dynamics (beside chemical reactions). Uneven flow profiles caused by hardly optimised raw gas ducts, the arrangement of the spraybanks and the distribution of the nozzles may result in so-called bypass-effects which reduce the efficiency of the scrubber. For the first time Austrian Energy & Environment AG (AE & E) detected these effects during SO 2 -profile measurements in the FGD Sostanj 4 (Slovenia) [1]. AE & E has used CFD simulations to identify these effects since 1995. CFD simulations are used to analyse flow phenomena firstly and to optimise the flow field secondly. CFD is used to describe the local hydro- and aerodynamic effects because it is a complex and costly task to measure local flow phenomena or flue gas concentrations in the absorber. Up to now 15 industrial flue gas scrubbers were optimised by CFD. Many FGD optimisations were supported by measurements for evaluation of the optimisation process[2]. Since the beginning of CFD simulations at AE & E the programme Fire has been used. The new addition as a simulation tool since 2005 is the CFD code Fluent, which reduced the simulation times significantly and simplified the mesh generation a lot. These commercial codes were always expanded with additional programmes, so-called user-routines, which evolved from the co-operation with the Institute for Process Technology & Industrial Environmental Protection at the University of Leoben." @default.
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• W2517111569 date "2007-03-13" @default.
• W2517111569 modified "2023-10-03" @default.
• W2517111569 title "Neuer Stand der Simulation von REA-Sprühtürmen am Beispiel des Rauchgaswäschers Niederaußem" @default.
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