Transcription of Column Tray and Packing Design - University of Oklahoma
1 DISTILLATION/ABSORPTION Column TRAY DESIGNChE 4253 - Design IChE 4253 - Design ITrays typesSieve Valve Bubble capEnhance Deck (Sulzer)DISTILLATION/ABSORPTION Column TRAY DESIGNChE 4253 - Design IChE 4253 - Design IOperational limits for Column TRAY DESIGNChE 4253 - Design IChE 4253 - Design IDesign PointDISTILLATION/ABSORPTION Column TRAY DESIGNChE 4253 - Design IChE 4253 - Design IDiameter first. Design for velocity. Flooding velocity given by (are you surprised?)ANUse ~80% of flooding velocity. Diameter is a function of the NET area ANFair correlationDISTILLATION/ABSORPTION Column TRAY DESIGNChE 4253 - Design IChE 4253 - Design ITray Spacing: Large if froth is expected, also allow space for crawling (12 to 24 ).
2 Downcomer area: Fluid velocity larger than ascending bubbles (minimum width: 5 ) Range of velocities= ft/sec. Residence time criteria (3-5 sec) . Downcomerflooding should be diameter: 3/16 to Hole Area: Such that the velocity through the holes does not form jets)Number of Holes: Hole area/Total hole areaHeight of weir: Francis formula Pressure drop: to be watched. Do not want it to be too large (5-10 ). Typical value ~ psiEfficiency: Murphy & Point Efficiency. There are correlations. In the absence of data look for similar mixtures. () ()All holesholesAhole diameterKKequilateral triangular pitchKrectangularpitchAhole pitch === DISTILLATION/ABSORPTION PACKED Column DESIGNChE 4253 - Design IChE 4253 - Design IPacked TowersDISTILLATION/ABSORPTION Column TRAY DESIGNChE 4253 - Design IChE 4253 - Design IRandom PackingDISTILLATION/ABSORPTION Column TRAY DESIGNChE 4253 - Design IChE 4253 - Design IStructured Packing Flexipack (Koch) SulzerCeramic DISTILLATION/ABSORPTION Column TRAY DESIGNChE 4253 - Design IChE 4253 - Design IPacking Height: Number of equilibrium stages x HETP (Height Equivalent to a Theoretical Plate)HETP.
3 Typically a function of gas rate (ft/sec) and the Packing , as well as the mixture. Packing Diameter: Similar graph to Fair s graph
