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A New Apparatus for the Accurate Measurement of LNG Densities

Natural gas is an important energy source of the future. To ensure a secure energy supply in Europe the trade with liquefied natural gas (LNG) is expected to increase significantly. The accurate determination of LNG densities is gaining importance not only for custody transfer calculations with regard to loading and unloading of LNG carriers and tanks but also for process simulations, e. g., for modelling of economically and ecologically optimised liquefaction and evaporation processes. Today the calculation models used for the determination of LNG densities show uncertainties of 0.3 to 0.5 %. To reduce these relatively large uncertainties new accurate sets of experimental p-�-T-x-data are essential.

For the accurate measurement of the densities of liquefied natural gas (LNG) a special densimeter has been designed in detail. The new densimeter will cover the range from 10 kg × m-3 to 1000 kg × m-3, thus enabling density measurements in the homogeneous liquid region, along the saturated liquid line (incl. vapour pressures) and in the homogenous gas region. The apparatus is designed for measurements in a temperature range from 90 K to 293 K at pressures up to 12 MPa. The achievable experimental uncertainty is estimated to be 0.02 %. The densimeter is based on the Archimedes (buoyancy) principle and is a single-sinker system incorporating a magnetic suspension coupling. The density is obtained directly, without the need for calibration fluids. The setup of the new densimeter will be carried out as part of the European Metrology Research Programme (EMRP) in combination with a project of the European Gas Research Group (GERG).

Copyright:	© Vulkan-Verlag GmbH
Quelle:	GWF gas solutions International (August 2010)
Seiten:	4
Preis:	€ 4,00
Autor:	Dr.-Ing. Markus Richter Prof. Dr.-Ing. Roland Span Dr.-Ing Reiner Kleinrahm Dr. Peter Schley Dr.-Ing. Markus Richter
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