Recovery - WL Storage Tank Model

Sets the charge of white liquor for 1 or 2 white liquor streams. White liquor charges can be an EA charge or an AA charge. If 2 white liquor streams are being set, both charges must be the same (i.e. both EA or both AA). The name of a pulp stream must be specified. The EA (or AA) flow is calculated by multiplying the charge times the flow of pulp (HPl) in the reference stream. If there is not enough clear white liquor, caustic makeup is used. If there is too much white liquor the excess goes to the excess white liquor stream.

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Data Descriptions

Data Unit Description
Set Item Type Native
Equipment Properties EA_Charge_1 Fraction or Percent Fraction EA Charge for WL_Outlet_1.
AA_Charge_1 Fraction or Percent Fraction AA Charge for WL_Outlet_1.
Stream_1 Name of the pulp reference stream for WL_Outlet_1.
EA_Charge_2 Fraction or Percent Fraction EA Charge for WL_Outlet_2.
AA_Charge_2 Fraction or Percent Fraction AA Charge for WL_Outlet_2.
Stream_2 Name of the pulp reference stream for WL_Outlet_2.
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Equipment Properties

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Example of using equipment

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Method&Equations

The outlet white liquor flows are calculated as the necessary Na2O (effective or absolute alkalinity) equivalent to the HPl contained in the reference pulp stream multiplied by the charge fraction set for each flow. If there is not enough clear white liquor, caustic makeup is used. If there is too much white liquor the excess goes to the excess white liquor stream.

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Warnings

WL Inlet flow is zero!

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Errors

Missing Stream(s)!

Neither EA Charge nor AA Charge specified!

Reference stream not specified!

Both charges must be the same basis (EA or AA)!

Reference stream 1 does not exist!

Reference stream 1's pulp (HPl) flow is zero!

Reference stream 2 does not exist!

Reference stream 2's pulp (HPl) flow is zero!

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