几种常用干燥设备的简捷计算方法

38320103CHEMICALENGINEERING(CHINA)Vol.38No.3Mar.2010:(1974),,,,,E2mail:[e-mail],,(,300222):,,8,,,,:;;;;:TQ028.6:A:100529954(2010)0320005205SimplifiedcalculatingmethodsforsomecommondryersLIJian2guo,ZHAOLi2juan,PANYong2kang(CollegeofMechanicalEngineering,TianjinUniversityofScience&Technology,Tianjin300222,China)Abstract:Tosimplifythedesignproceduresofdryingequipmentthesimplifieddesignmethodsfortheprimarydimensionsofeightcommondryers,includingfluidized2beddryer,vibro2fluildizedbeddryer,fluidized2beddryerwithinnerparticles,inertparticlesfluidized2beddryerrotaryspraydryer,pressurespraydryer,rotaryflashdryeranddraftdryer,wereputforwardaccordingtoindustrialpracticesandexperientialformulas.Thebasiccalculationssuitableforalldryingequipmentwereintroduced.Thementionedsimplifiedmethodsadoptmanyempiricaldataandcandirectthedesignofindustrialdryerperfectly.Besidestheprimarydimensions,manystructuraldimensionsshouldbeconfirmedbasedonthedesignersexperienceormoredetailedinformation.Keywords:design;fluidizedbed;spraydrying;rotaryflash;draftdrying,(),(),,3,,,,,,1,[122]1.14:G0,Ge,w0,we31:G0(1-w0)=Ge(1-we)(1)Gew0,we,(1)G0=Ge1-we1-w0(2)G0w0,we,(1)Ge=G01-w01-we(3)W=G0-Ge(4)1.2Q=W(5):,kJ/kg,,=2394kJ/kg,,0.60.9,Q=Q/=W/(6)1.3:130,20,40%,qV130=Q20cp20(130-20)(7):20=1.205kg/m3,cp20=1.005kJ/(kg),130,20,y=W1000qV130130(8)y2=y1+y(9)(1):2040%AAy1=0.006kg/kgA130B(AB)Bh1=147kJ/kg,=0.85,h2(kJ/kg):h2=h1=1470.85=125,h2y2C,,C401Fig.1Enthalpy2humiditychartofmoistair1.4qV130,qV20=qV130273+20273+130(10):qV40=qV130273+40273+130(11),qV40qvapor=W/vapor(12)2,,:w,kg/m3;,,min,;q1=G1/w,m3/h;V=q160,m32.1H=0.2m,A=V0.2,,A=LBL,m;B,m:u=qV,in3600A(13)u,2.2H=0.1m,,,2.3,,,AH=QKt(14):K,200W/(m2K)2.41620103831Table1Fluidizedvelocityofseveralinertparticles/(ms-1)2mm3mm4mm5mm6mm5.56.27.07.89.53.14.34.85.96.55.15.96.87.29.05.86.57.58.410.130%120%,,,30%50%,,,22Table2PropertiesofseveralfluidizedbedwithinertparticlesD1/mmD2/mmH0/mmH/mm/m3/(kgh-1)No.1300350200250145020.0140.01857GLP5D=0.8mNo.2500580200300190040.040.061624GLP5D=1.6mNo.3800930300400220060.150.26080GLP5D=2mNo.410001160350500250080.280.4110160GLP5D=2.5mNo.5120014004006002900100.450.68180270GLP5D=3.1mNo.6140016305007003300120.771.09300440GLP5D=3.5mNo.7160018606008003700141.21.61480640GLP5D=4.5m3[3]3.1G0()d,N33Table3Industrialstandardofsomefactories5255010015020030050010002000500010000/(kgh-1)5255010015020030050010002000500010000/m0.81.622.42.73.03.34.55.06.08.010.0/mm50120150150180210240/(rmin-1)2500022000180001500012000100003.2R99R99=3.46d0.3G0.220N-0.16(15)DD=R992(1.01.2)(16)H,H/D=0.8160,:H1=0.866D7H=H+H1=H+0.866DV=4D2H+12D2H1(17)0.10.15m/s530s3.3I4Table4Volumetricevaporationintensitiesofdryingtowerkg/(m3h)//150200250300350400703.585.277.639.4911.2012.74803.035.187.078.931001.924.095.967.809.3311.11Vc=WI(18)Vc(15)V,4:Veff=WI(19),[4]I:I=(t1+273)3.4287(t2+273)3.34(20)5,0.30.5m/s;,35m/s:D=qV,h900u(21):u,0.30.5m/sHt,:Ht=u(22)5[122,5]1.6m,26m5.1D=qV,h900u(23):u,m/s,35m/s5Table5Dryingintensityofseveralmaterials/%/%///(kgm-3h-1)60232401003.12303148821.8603160850.63600.527030012013070BR6865518019090953.585.2,V=WI(24)Hc=4VD2(25)6,3004000Pa20m0.52.0s(7s)[122,5]826425155kJ/(hm3K)203082010383t=(t1-tm1)-(t2-tm2)ln(t1-tm1)(t2-tm2)(26)V=QhVt(27)D=qV,h900u(28)D0.31.5m,u=20m/s(2040m/s)L=4VD2(29),,0.21.0,,7,,,,,,:cp,kJ/(kg)hV,kJ/(hm3K)Q,kJ/hQ,kJ/hqV,h,m3/hqV,in,m3/ht1,t2,tm1,tm2,W,kg/hy,kg/kg,%:[1],,.[M].:,2007.[2],,.[M].:,2005.[3]MASTERSK.Spraydryinghandbook[M].5thed.NewYork:LongmanScientific&Technical,1991.[4],,.[J].,1997,21():68271.[5].[M].:,2002.,,()()()()(CA)Scopus,,,(),,9