CFB脱硫塔设计计算

1、SCRUBBER DESIGN (PACKED COLUMN)Prepared by : Checked by : Date :In put DataPack ing typePack ing sizePacki ng MOCGas pr. Drop / m bedTotal pack ing heightColu mn Tag No. Job No.Clie ntProjectStreamIn tallox Saddles25mmPP15mmWC / m pack ing height3.2m (in clud ing all packed beds)HCL Scrubber4506AJOL

2、SR - Pla nt -4, 5HCL Vap.I2147.1 (N/m )/mGas / Vapour PropertiesGas / Air flow rateGas pressure at entryGas temperature at entryGas / Air mol weight1000 kg/h0.2778 kg/s1.0000 atm30.00 oC29Comp onent to be scrubbedComp onent Name=HCL VapComp onent flow rate=70Kg/h% comp. in air/gas= 6% (v/v)Molecular

3、 weight of comp.=36.5Liquid / Scrubb ing media PropertiesScrubb ing mediaLiquid flow rate, LLiquid Den sity,ClLiquid Viscosity, 札=|0.0214 kg/s=31100 kg/m2=0.0035000 Ns/m=20% NaOH=77 kg/hPack ing factor, F p=Charac. Pack ing Factor,C f = Con vers ion factor, J=OR(presumed) / (give n by clie nt) / (by

4、 process cal.)Con vers ion :3.5 Cp0.00350000 Ns/m21 m33 Ref. Table 6.3, Characterstics of Ran dom pack ings1.0 factor for adequate liquid distribution & irrigation across the bedSheet 1 of 5Calculati onsSheet 3 of 5Sheet # of 5TO CALCULATE COLUMN DIAMETERSi nee larger flow qua ntities are at the

5、 bottom for an absorber, the diameter will be chose n to accommodate the bottom eon diti ons.To calculate Gas den sity29.45 Kg / KmolAvg. molecular weightIf gas flow rate is give n in kg/hIf gas flow rate is give n in m3/hGas in0.009432183Kmol/sGas inkmol = mass / mol wt=(kmol/s) x T 齐 kelvin x 1j0$

6、tm2 73 pr. |n atm0.234499 m /s273x pr. in atmT in kelvin(1.0 atm j3=(m /s) x122.4 L j0| Kmol/s0Kg/smass = mol wt x kmolSheet # of 5Sheet # of 5Select vol. flow rate and mass flow rate from above, Selected mass flow rate=0.277778 Kg/s3Selected vol. Flow rate=0.234499 m /sSelected molar flow rate=0.00

7、9432 Kmol/sTherefore, gas den sity1.1846 Kg/m(mass flow rate / vol. Flow rate)Sheet # of 5Sheet # of 5To find L', G' and Tower c/s areaAssum ing esse ntially complete absorbti on,Sheet # of 5Comp onent removedLiquid leav ing0.5Kg/sKg/s(molar flow rate x % comp. x mol. Wt.) (Inlet liquid flow

8、 rate + comp. Removed)Using0.00497G' 2 Cf 胖 JCG ( CT - Lg) gcas ordi nate,Refer fig.6.340.04(from graph)2using a gas pressure drop of147.1 (N/m )/mTherefore, G'Tower c/s areaTower diameterCorresp onding c/s area0.04CB ( Ol -雄)g c2.s(c/s area = mass flow rate / G')|460.7 mmSheet # of 5TO

9、ESTIMATE POWER REQUIREMENTEfficie ncy of fan / blowerTo calculate pressure dropPressure drop for irrigated pack ingFor dry pack ing,O/L Gas flow rate, G'O/L Gas pressureGas den sity, Cg60 %assumed / given=470.72 N/m(pressure drop per m pack ing x total ht. of pack ing)1.3095100854.3Kg / m 2.sN/m

10、 2(Gas in let flow rate - Component removed) / c/s area(subtract ing pressure drop across pack ing)厂 gas mol wt. x 22.41m3/Kmol JKg/m匂as o/l pr.101330C DDelta PZPressure drop for pack ingPressure drop for intern alsGas velocityInlet expa nsion & outlet con tracti on lossesTotal pressure dropFan

11、power outputPower for fan motor96.7Ref. Table 6.3, Characterstics of Ran dom pack ingspressure drop,N/m2(irrigated pack ing + dry pack ing)(packing supports and liquid distributors)=1.5 x (V 2 / 2g)(divide by den sity)(pack ing + in ter nals + losses)x (gas in - comp onent removed) Kg/s(fan power ou

12、tput / motor efficie ncy)O/L gas den sity, Kg/mSheet 5 of 5Liq.-Vap. Flow factor, F lv = (L I V) x (/ cr I <y)=0.0025Desig n for an in itial pressure drop of15 mm H2O Im pack ingFrom K 4 v/s F lv ,K4=0.85Sheet 7 of 5Sheet # of 5=(j(K 4 I K4 at flooding) ) x 100 =36.1620K4 at flood ingTrial % floo

13、d ingGas mass flow rate, V mTrial column c/s area(Trial A s)Trial colum n dia., D6.50K 4 . OV ( CT - (Tv)0.1113.1 F p ( u I Cl)23.7763 kgIm .sV I VmSheet # of 5Sheet # of 5Round off 'D' to n earest sta ndard sizeTherefore, D=0.500 mSheet # of 5Sheet # of 5Colum n CIS area, A s% floodi ngm2As

14、 = (piI4) x D% flooding = Trial % flooding x (Trial A s I As)Sheet # of 5Sheet # of 5Con clusi onGen erally packed towers are desig ned for 50% - 85% flood ing.If flood ing is to be reduced,(i) Select larger pack ing size and repeat the above steps.ORIn crease the colu mn diameter and repeat the abo

15、ve steps.Sheet # of 5HETP PREDICTIONSheet 9 of 5Sheet # of 5Norton's Correlatio n :In HETP = n - 0.187 InApplicable whe n,liquid phase surface tension > 4 dyn e/cm & < 36 dyn e/cm liquid viscosity > 0.08 cP & < 0.83 cPIn put DataLiquid-phaseSurface Tension,C =20 dyne/cm+ -0-213 ln11Con vers ion :0.018 N/m =| 18 |dyne/cmNorton's Correlation ApplicableLiquid Viscosity=3.5 cPNort on's Correlation NOT applicablen=1.13080Calculati on ln HETP HETP= 0.837437"!2.3104370.704221ftmFor separations, less than 15 theoritical stag