7/30/2019 Requirements for Design of Separators

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Requirements for design of separators

1. Theoretical calculationsa. Verification of HYSYS calculations: The team should show the

HYSYS calculations and verify them (for simple cases, such asdilute gas absorption, simple distillation, simple multicomponent

distillation, i.e. no ternary azeotropes) by techniques learnt in the

unit operations course (e.g. McCAbe-Thiele, FUG, etc.).

Reasonable assumptions are permissible to perform manual

calculations.

b. Validation of thermodynamic packages: The choice ofthermodynamic packages requires special attention. The team

should demonstrate why a specific thermodynamic package was

chosen. This should be performed by comparing experimentaldata available in the literature to predictions by the chosen

package and others that were considered. The mixtures chosen

for this benchmarking exercise and conditions considered should

closely resemble the ones encountered in the process.

c. Making assumptions and simplifications: When simplifications areto be made, proper justification should be given as to why the

simplification will not significantly affect the final design.

2. Equipmenta. Choice of equipment: Discussions on what choices were

considered for the equipment and why the team chose a

particular system (e.g. tray towers vs packed columns, structured

packing vs random packing, rings vs. Saddles, single-pass vs.

Double-pass, etc.) should be included. Analysis/arguments could

consider technical aspects, operating costs and other relevant

aspects.

b. Detailed calculations: Once the equipment is chosen, detailedcalculations concerning sizing of equipment. The following detailsshould be presented (wherever applicable). The calculation should

be based on sound theory readily accessible through standard

textbooks and reference material available in the open literature.

The team should clearly reference the source of particular

equations and briefly describe the assumptions used for the

development of equations. It is also important that the team

demonstrates that the design being performed indeed satisfies

those assumptions (e.g. if three different correlations are to be

used based on the range of Reynolds number, it is important to

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quote the three relations; calculate the Reynolds number; then

choose from the three correlations). The design of the following

parameters are expected:

i. Diameter of the columnii. Height of the column

iii. Thickness of shelliv. Material of constructionv. Diameter of trays

vi. Area of downcomersvii. Wier heightsviii. Manholes, numbers and location.

ix. Details of liq/gas inlets and outlets, i.e. diameters)x. Tray spacingxi. Other relevant details

c. Diagram of details: The team should present in a professionalmanner, details of the equipment to scale. No hand-drawn

diagrams shall be accepted. The drawings should be neatly

labelled and dimensioned. The use of MS-Visio is encouraged.

Overall schematic and cross section views showing the details are

expected.

d. Units: Teams should clearly indicate the units for the parameters.SI units should be used at all places.3. Discussions

a. Wherever a comparison is to be made or a one route has to bechosen among several, the group should show detailed

discussions, i.e. reporting only the data/plot is not sufficient. The

grounds for choosing a particular design alternative should be

strongly grounded based on technical and/or economic

constraints.