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Ingen lysbildetittel

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Title: Ingen lysbildetittel Author: Even Gran Last modified by: Bjorn Created Date: 8/16/2002 11:58:11 AM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

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Title: Ingen lysbildetittel


1
Modelling the bulk cooler in NPK 4 as a series of
CSTRs Presented by Bjørn Tore
Mathisen Department of Chemical
Engineering December 2013
Modelling the bulk cooler in NPK 4 as a series of
CSTRs, 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 bottleneckthe 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 CSTRs
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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