Computers & Control


(Ansys, Fluent). For the system simulation of the mile long and branched piping systems, Lurgi GmbH has successfully used Flowmaster for more than 10 years.


Fast model generation Unlike 3D CFD programs which require CAD-geometry to model systems, Flowmaster only requires schematic models which can be generated using standard components and drag and drop functionality. The behaviour of these components (pipes, valves, pumps


,etc) is described by physical equations and/or empirical data which are stored in thematically oriented libraries. Alternatively, own calculations and tests can be used to


understand the behaviour of components using characteristic curves or arrays obtained from the originator. For clarity and to minimise the potential number of error


sources, the models are kept as simple as possible. For example, the typical behaviour of a whole sub-system can be described by its pressure loss; nevertheless, the analysed models often obtain up to 5000 components. “In principle we try to generate our models as simply as


possible,” explains Jürgen Bohle, Chief Engineer at Lurgi GmbH. “but to calculate for example pressure losses and distribution, besides the literal system you need the character and position of in- and outlet - that’s just physics.”


Software code Today, Flowmaster is an essential component of the engineering process at Lurgi, especially as it is the only software code which allows the calculation of pressure losses in the widely branched


piping systems. The field of application ranges from research, development and plant design through to failure analysis resulting in preventive activities for future projects. Jürgen Bohle said: “Our main focus is on the dimensioning


and optimisation of new components or devices which can be used as so called ‘prop equipment’ in future projects to tackle distribution problems. Our main objective is the best possible homogenous gas distribution in piping systems. “A typical example of this kind of problem is the injection


system of an MTP plant (methanol to propylen) where liquid DME (Dimethylether) is blown into a hot gas flow. This process runs in a reactor where a large number of jets on different levels have to be fed over a widely branched piping system. For a highly homogenous spray and evaporation flow we optimised the feeding and atomisation using Flowmaster,” continues Jürgen Bohle.


System simulation More than 800 pipes can diverge from the manifolds in such plants. Without reliable system simulation, the engineers would not be able to ensure a homogeneous inflow to the catalytic converters and as a result a stable and efficient process. Flowmaster is even used for safety relevant research. One of


many examples is the analysis and optimisation of the opening process of safety valves for a fire suppression system to ensure that enough water is available for all hydrants. ❒


Enter 17 or ✔ at www.engineerlive.com/ece


Ulrich Feldhaus is with Flowmaster GmbH, Idstein, Germany. www.flowmaster.com


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