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Modeling of a CO 2 -stripper

This project aims to optimize a CO2-stripper system to produce pure ethane while maintaining CO2 content within limits. Using dynamic modeling in D-spice and Matlab, the study involves a 75-stage column with a reboiler and reflux tank. Results from ProSim simulations and comparisons with actual plant data highlight areas for improvement.

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Modeling of a CO 2 -stripper

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  1. Modeling of a CO2-stripper Marie Solvik Supervisors : Sigurd Skogestad and Marius Støre Govatsmark

  2. CO2-stripper PC PC LC • Objectives • Produce pure ethane product • Keep the CO2 content in the sales gas within the limit. LT, XLT FC F, z, hf • 75 stages including reboiler and reflux tank • Bottom product – purified ethane • Distillate – Offgas (CO2, ethane and some methane) LC QR There exist a dynamic model of the system in D-spice B, xB

  3. 2-component flash tank made in Matlab • SRK equation of state with binary interaction parameter found by Kornberg (2007) • 2 components- ethane and CO2 • Compared to simulation done in ProSim

  4. 3-component flash tank made in Matlab Real time composition of ethane(red) and CO2 (green) from Aspen process explorer. • Added an extra component, methane to the model • Compared with actual process data from the top of the column and a flash tank model made in D-spice

  5. D-spice versus Matlab

  6. Columnmodel made in Matlab • SRK function of state • Builds on the flash tank model • 75 stages • Time-consuming

  7. Conclusion • The column model needs to be improved before finding optimal operating points • Flash tank model made in D-spice showed accurate results when comparing with actual plant data and with Matlab model.

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