Potter.Metts.multiple effect evaporator - GRADED

Potter.Metts.multiple effect evaporator - GRADED - Sheet...

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Sheet Information This spreadsheet is constructed to model a three-effect evaporator system. The base case mod while the following worksheets model the system with the addition of a flash tank and some mod stream. The evaporator system modeled brings weak black liquor in from the right and it flows effects from right to left. In each effect the liquor is heated with steam and some of the wate evaporated. The steam enters the flowsheet from the left and in each effect it is used to heat t rejected out the bottom as condensate. The steam for the subsequent effect comes from the va previous effect from the evaporation of water from the black liquor. Steam lines are red, Liquo condensate lines are blue. The addition of a flash tank takes the condensate from the left effect at a lower pressure. The vapor from this flash tank is fed to the rightmost effect to help evapora This system models the evaporators for achieving the same final liquor concentration. If steam a or some other parameter kept constant the simulation setup would have to be changed. This sim varying the evaporation in the rightmost stage and using a solver stage to vary this evaporation s solids is kept constant.
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dels the system as is, ifications to the input s through the three er in the liquor is the liquor and then apor produced in the or lines black, and t and allows it to flash ate the black liquor. addition was limited, ulation converges by such that the final %
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Case Steam economy, lbs H2O evap/lb steam Final % dissolved solids Base 2.40 25.60% Flash Tank #DIV/0! #DIV/0! Feed Temp 185 F #DIV/0! #DIV/0! Feed Temp 180 F #DIV/0! #DIV/0! Feed Solids 13% #DIV/0! #DIV/0! Feed Solids 16% #DIV/0! #DIV/0! Effects of the Sensitivity Analysis The effects of the sensitivity analysis are as follows. The addition of the flash tank impr usage. This is because heat energy in the condensate is recovered and used to help h the capacity of the evaporators if more steam was not available for this system. If the s then the flash tank addition would not increase capacity. Heating the incoming stream decreases the use of fresh steam. This is because less energy is required to boil the enters. This could improve evaporation capacity if the system could not deliver more h the opposite effect. This is because it requires more heat energy to evaporate wate addition of heat to the system was limited. Lowering the incoming solids to 13% lower amount of steam required for the evaporators. This could constrict capacity if the syst couldn't volumemtrically process more liquor. Increasing the solids to 16% increases amount of steam required for the system. This change could increase capacity if the s or volumetrically limited in the amount of liquor it could process. . See the tables
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Steam usage, lbs/hr % change steam economy% change steam usage 28929 Base Base #DIV/0! #DIV/0! #DIV/0! #DIV/0!
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This note was uploaded on 02/07/2011 for the course PSE 417 taught by Professor Kirkman during the Fall '10 term at N.C. State.

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Potter.Metts.multiple effect evaporator - GRADED - Sheet...

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