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Dynamic modelling and optimisation of cryogenic systems.

Author(s) : RODRÍGUEZ M., DIAZ M. S.

Type of article: Article

Summary

This work addresses the dynamic optimisation of the cryogenic sector in a large-scale natural gas processing plant. Main attention is focused on rigorous dynamic modelling of counter-current heat exchangers with phase change and a subsequent high-pressure separation tank. The original distributed parameter problem, which results from dynamic energy balances in counter-current heat exchangers, is transformed into an ordinary differential system by performing spatial discretisation with the method of lines. The entire model comprises algebraic equations for thermodynamic predictions with the Soave-Redlich-Kwong equation of state, hydraulic and design equations. The differential-algebraic equation optimisation problem is solved with an advanced simultaneous strategy that transforms the original problem into a large-scale nonlinear programming problem through discretisation in time of the entire set of variables by collocation on finite elements. Model resolution provides optimal temporal and spatial profiles for pressure and temperature in heat exchangers, together with partial condensation description. [Reprinted with permission from Elsevier. Copyright, 2006].

Details

  • Original title: Dynamic modelling and optimisation of cryogenic systems.
  • Record ID : 2008-0478
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 27 - n. 7
  • Publication date: 2007/05

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