Column TagNo.:HCL Scrubbe rJob No.:4506A Client:JOLProject:SR -Plant -4, 5InputData Stream:HCL Vap.Packingtype=Intallox SaddlesPackingsize=25mm PackingMOC=PPGas pr.Drop / mbed=15mmWC /mpackingheight=147.1(N/m2)/mTotalpackingheight= 3.2m (including all packed beds)Gas / Vapour Propertie sGas / Airflow rate=1000kg/h OR0m 3/ h=0.2778kg/s=0m 3/ sGaspressureat entry= 1.0000atmGastemperature at entry=30.00o C=303.00o K Gas / Airmolweight=29Component to bescrubbedSCRUBBER DESIGN (PACKED COLUMN)nt Name=HCL Vap Component flowrate=70Kg/h % comp.in air/gas=6% (v/v)Molecularweight ofcomp.=36.5Liquid /Scrubbing mediaPropertiesScrubbingmedia=20% NaOHLiquid flowrate, L=77kg/h =0.0214kg/sLiquid Density,L =1100kg/m3Conversion :LiquidViscosity,=0.0035000Ns/m2 3.5C p =Ns/m2 Packingfactor, F p=21m-1Charac.PackingFactor,C f=33 Ref. Table 6.3, Characte rstics of Random packingsConversion factor, J= 1.0factor foradequateliquiddistribution &irrigationacrossthe bed0.00350000onsTO CALCULATE COLUMN DIAMETER Sincelarger flowquantitiesare at thebottom foranabsorber,thediameterwill bechosen toaccommodate thebottomconditions.TocalculateGasdensityAvg.molecularweight=29.45Kg / KmolSelect vol.flow rateand massflow ratefromabove,Selectedmass flowrate=0.277778Kg/s Selectedvol. Flowrate=0.234499m3/s Selectedmolar flowrate=0.009432Kmol/sTherefore, gasdensity= 1.1846Kg/m3(mass flow rate / vol. Flow rate)To findL', G' and Tower c/s area Assuming essentially complete absorbtion ,Compone ntremoved=0.0207Kg/s(molarflowrate x %comp. xmol.Wt.)Liquidleaving=0.0420Kg/s (Inlet liquid flow rate + comp. Remov ed)0.5=Using0.00497asordinate,Referfig.6.34using agaspressuredrop of147.1(N/m2)/m G' 2 C fµL0.1 J=0.04(fromgraph)- G) g cTherefore,G'=0.5LJ= 1.6665Kg / m2.sTower c/sarea=0.1667m2( c/sarea =massflowrate / G')Towerdiameter=0.4607m=460.7mm=500mmCorresponding c/sarea=0.1963m2TO ESTIMATE POWER REQUIREMENTEfficiencyof fan /blower=60%TocalculatepressuredropPressuredrop forirrigated=470.72N/m2(pressu re drop per m packingx totalht. ofpacking)packingFor drypacking,O/L Gasflow rate,G'=2.s(Gasinletflowrate -Componentremoved) / c/sareaO/L Gaspressure=2(subtractingpressure dropacrosspacking)Gasdensity,G=gas o/lpr.kelvin101330= 1.1605Kg/m3C D=96.7Ref.Table6.3,Characterstics ofRandompackingsDelta P =Z=2Pressure drop for packing=613.61N/m 2(irrigate dpacking + dry packing )Pressure drop for internals=25mmWC (packin gsupport s and liquid distribut ors)=245.17N/m 2Gas velocity =7.5m/sInletexpansion & outlet = 1.5 x Velocity heads =1.5 x (V 2 / 2g)contractio n losses=42.19N m / Kg=49.97N/m 2(divide bydensity)Total pressure drop=908.75N/m 2(packin g +internal s +losses)Fan power output=pressure drop,N/m 2x (gas in -componen t removed)Kg/sO/L gas density,3=Power for fan motor=0.34kW(fan power output /motor efficien cy)=0.45hpLiq.-Vap.Flowfactor, F LV=(L / V) x (V / L )=0.0025Design foran initial pressure drop of 15mm H2O /m packingFrom K 4v/s F LV ,K 4=0.85K 4 at flooding= 6.50Trial %flooding=( (K 4 /K 4 at flooding)) x 100=36.1620Gas mass flow rate,V m= 13.1 F p (µL / L )0.1=3.7763kg/m 2.sTrial column c/s area =V / V m(Trial A s )=0.0736m 2Trial column dia., D=0.3060mD = (4/pi) x Trial A sRound off 'D' to nearest standard sizeTherefore,D=0.500mCOLUMN DIAMETER / HYDRAULIC CHECK(1/2)Column C/S area,A s=0.1963m2A s =(pi/4) xD2% flooding=% flooding = Trial % flooding x (Trial A s / A s)Conclusi on Generally packed towers are designed for 50% --85% flooding. If flooding is to be reduced, (i) Select larger packing size and repeat the above steps.OR(ii) Increase the column diameter and repeat the above steps.Norton's Correlati on :ln HETP= n -0.187 ln+ 0.213 lnµApplicablewhen,liquidphasesurfacetension >4 dyne/cm& < 36dyne/cmliquidviscosity> 0.08 cP& < 0.83cPConversion :Input Data0.018 N/m =dyne/cm Liquid-phaseSurface Tension,=20dyne/cm Liquid Viscosity= 3.5cP n= 1.13080Calculationln HETP=HETP =2.310437ft =0.704221mHETP PREDICTIONNorton's Correlation Applicable Norton's Correlation NOT applicable 18Forseparations, lessthan 15theoriticalstages, a20%designsafetyfactor canbeapplied.Considering 20%safetyfactor,HETP=Forseparations,requiring15 to 25theoriticalstages, a15%designsafetyfactor canbeapplied.Considering 15%safetyfactor,HETP=0.809854m。