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Use the Evaporator to simulate multiple-effect evaporators. Use this block to increase the concentration or consistency in a stream by evaporating water using a specified amount of steam.
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What do you want to see?
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Data |
Unit |
Description |
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Set |
Item |
Type |
Native |
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Equipment Properties |
Pres |
Pressure |
psia |
Dome Pressure. |
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HeatTransfer |
Fraction or Percent |
Fraction |
Fraction of available heat from condensing steam transferred to the liquor. |
The strong liquor and vapor stream pressures are set to the specified dome pressure. The outlet condensate is assumed saturated. The heat available for evaporation is calculated as:
Q = (FS * HS - FC * HC) * Eff
where:
FS is the flow of steam
HS is the steam enthalpy
FC is the flow of condensate (=FS)
HC is the condensate enthalpy
Eff is the heat transfer efficiency
The strong liquor enthalpy is calculated from:
HSL = ( FWL * HWL + Q ) / FSL
where:
HSL is the enthalpy of the strong liquor
FWL is the weak liquor flow
HWL is the enthalpy of the weak liquor
FSL is the strong liquor flow (=FWL)
The strong liquor is then flashed at the dome pressure to determine the vapor flow and the flow of water in the resulting strong liquor.
No steam entering!
Solution: Set a nonzero steam flow.
The condensate saturated temperature lower than the outlet liquor temperature!
Solution: Use higher steam pressure or lower dome pressure.
Missing Stream(s)!
Solution: check if all the streams are connected to the equipment.
Warnings 