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Modelling the bulk cooler in NPK 4 as a series of CSTR’s Presented by Bjørn Tore Mathisen

This presentation by Bjørn Tore Mathisen from the Department of Chemical Engineering discusses the modelling of the bulk cooler in NPK 4 as a series of Continuous Stirred Tank Reactors (CSTR's). It covers topics such as the Solex thermalTM bulk cooler, phase changes, mass and energy balances, model scaling, parameter discussion, and the impact of midsummer heat on plant operations.

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Modelling the bulk cooler in NPK 4 as a series of CSTR’s Presented by Bjørn Tore Mathisen

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  1. Modelling the bulk cooler in NPK 4 as a series of CSTR’s Presented by Bjørn Tore Mathisen Department of Chemical Engineering December 2013 Modelling the bulk cooler in NPK 4 as a series of CSTR’s, by Bjørn Tore Mathisen

  2. Program • Background: The hot norwegian summers • Introducing the Solex thermalTM bulk cooler • An unexpected phase change • The single CSTR mass and energy balances • Expanding to a CSTR in serie model • Model scaling to fit design data • Parameter discussion and justification

  3. An unconventional bottleneck;the midsummer heat • The 2012 plant wide expansion. • From 1.9 million tonnes/year to 2.1 milion • Plant wide bottleneck rundown. Figure 1 | Typical hot norwegian midsummer night

  4. Introducing the Solex thermalTM bulk cooler. • Solid – liquid heat exchange • NPK 4 version includes counter current and co-current flow

  5. An unexpected phase change • AN phase change in the bulk cooler T range • Chosen modelling technique – the ∆Tphase = 1oC solution

  6. Modelling as a Single CSTR

  7. Modelling as a series of CSTR’s

  8. Simulink S-function as PDE solver

  9. Initial BC temperature profile • Does not hit outlet target values. • Lacking phase change modelling.

  10. Adjusted model • Introducing p.alfa and p.beta • Modifying the heat transfer coefficient and the NPK heat capacity. • Implemented the phase change model

  11. Parameter justification • p.alfa decreases effective cpNPK • p.beta decreases effective heat transfer area.

  12. The 250tonn/h scenario • PI control by using the SIMC rules • Cooling water flow rate skyrockets • p.beta unreliable in temperature range outside of design values

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