脱硫塔设计计算.docx

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1、脱硫塔设计计算ColumnTagNo.:HCLScrubberJobNo.:4506AClient:JOLProject:SR-Plant-4,5InputDataStream:HCLVap.Packingtype=IntalloxSaddlesPackingsize=25mmPackingMOC=PPGaspr.Drop/mbed=15mmWC/mpackingheight=147.1(N/m2)/mTotalpackingheight=3.2m(includingallpackedbeds)Gas/VapourPropertiesGas/Airflowrate=1000kg/hOR0m3/

2、h=0.2778kg/s=0m3/sGaspressureatentry=1.0000atmGastemperatureatentry=30.00oC=303.00oKGas/Airmolweight=29ComponenttobescrubbedComponentName=HCLVapComponentflowrate=70Kg/h%comp.inair/gas=6%(v/v)Molecularweightofcomp.=36.53Conversion:LiquidViscosity,L=0.0035000Ns/m23.5Cp=Ns/m2Packingfactor,Fp=21m-1Chara

3、c.PackingFactor,Cf=33Ref.Table6.3,CharactersticsofRandompackingsConversionfactor,J=1.0factorforadequateliquiddistribution&irrigationacrossthebedSCRUBBERDESIGN(PACKEDCOLUMN)0.00350000CalculationsSincelargerflowquantitiesareatthebottomforanabsorber,thediameterwillbechosentoaccommodatethebottomconditio

4、ns.TocalculateGasdensityAvg.molecularweight=29.45Kg/KmolSelectvol.flowrateandmassflowratefromabove,Selectedmassflowrate=0.277778Kg/sSelectedvol.Flowrate=0.234499m3/sSelectedmolarflowrate=0.009432Kmol/sTherefore,gasdensity=1.1846Kg/m3(massflowrate/vol.Flowrate)TofindL,GandTowerc/sareaComponentremoved

5、=(molarflowratex%comp.xmol.Wt.)Liquidleaving=(Inletliquidflowrate+comp.Removed)0.5=0.00497Using0.00497asordinate,Referfig.6.34usingagaspressuredropof147.1(N/m2)/mG2CfL0.1J=0.04(fromgraph)gcTherefore,G=0.5=1.6665Kg/m2.sTowerc/sarea=0.1667m2(c/sarea=massflowrate/G)Towerdiameter=0.4607m=460.7mm=500mmCo

6、rrespondingc/sarea=2TOCALCULATECOLUMNDIAMETEREfficiencyoffan/blower=60%TocalculatepressuredropPressuredropforirrigated=2(pressuredroppermpackingxtotalht.ofpacking)packingFordrypacking,O/LGasflowrate,G=2.s(Gasinletflowrate-Componentremoved)/c/sareaO/LGaspressure=2(subtractingpressuredropacrosspacking

7、)=gasmolwt.x273xgaso/lpr.22.41m3/KmolTinkelvin101330=CD=96.7Ref.Table6.3,CharactersticsofRandompackingsDeltaP=Z=2Pressuredropforpacking=613.61N/m2(irrigatedpacking+drypacking)Pressuredropforinternals=25mmWC(packingsupportsandliquiddistributors)=245.17N/m2Gasvelocity=7.5m/sInletexpansion&outlet=1.5xV

8、elocityheads=1.5x(V2/2g)contractionlosses=42.19Nm/Kg=49.97N/m2(dividebydensity)Totalpressuredrop=908.75N/m2(packing+internals+losses)Fanpoweroutput=pressuredrop,N/m2x(gasin-componentremoved)Kg/sO/Lgasdensity,Kg/m3=201.35N.m/s=0.20kWPowerforfanmotor=0.34kW(fanpoweroutput/motorefficiency)=0.45hpTOESTI

9、MATEPOWERREQUIREMENTLiq.-Vap.Flowfactor,FLV=Designforaninitialpressuredropof15mmH2O/mpackingFromK4v/sFLV,K4=0.85K4atflooding=6.50Trial%flooding=Gasmassflowrate,Vm=3.7763kg/m2.sTrialcolumnc/sarea=V/Vm(TrialAs)=0.0736m2Trialcolumndia.,D=D=(4/pi)xTrialAsRoundoffDtoneareststandardsizeTherefore,D=0.500mC

10、olumnC/Sarea,As=2As=(pi/4)xD2%flooding=%flooding=Trial%floodingx(TrialAs/As)ConclusionGenerallypackedtowersaredesignedfor50%-85%flooding.Iffloodingistobereduced,(i)Selectlargerpackingsizeandrepeattheabovesteps.OR(ii)Increasethecolumndiameterandrepeattheabovesteps.COLUMNDIAMETER/HYDRAULICCHECK(1/2)In

11、putData0.018N/m=dyne/cmLiquid-phaseSurfaceTension,=20dyne/cmLiquidViscosity=3.5cPn=1.13080CalculationlnHETP=HETP=2.310437ft=0.704221mForseparations,lessthan15theoriticalstages,a20%designsafetyfactorcanbeapplied.Considering20%safetyfactor,HETP=0.845065mForseparations,requiring15to25theoriticalstages,a15%designsafetyfactorcanbeapplied.Considering15%safetyfactor,HETP=0.809854mHETPPREDICTIONNortonsCorrelationApplicableNortonsCorrelationNOTapplicable18