机械密封冷却冲洗量的估算

2003333RoughEstimateonCoolingFlushAmountofMechanicalSeals200240AbstractLogicalcoolingflushamountenablespumpmechanicalsealstobereliableandhaslongservicelife.Theroughestimatemethodoncoolingflushamountisapplicabletopracticaloccasions.Keywordsmechanicalseals,temperaturegrowth,coolingflushamount122.111ODmmIDmmBDmmFSPNDPN/m2nrpmf0.070.01~0.18k0.5(mm2)A=/4OD2-ID21B=OD2-BD2/OD2-ID22(N)F=[DPA10-6(B-k)+FSP]f3mm3420033MD=OD+ID/24m/sv=MD10-3n/605WP=Fv6(J/s)Qsealheat=P72.2Qheatsoak(J/s)Qheatsoak=UHSdT8U—H—S—,BDmmdT—Qheatsoak=0.249SdT93Qinjm3/sQinj=(Qsealheat+Qheatsoak)/(TC)10—kg/m3C—(J/kg)T—(2.5~5)24—1601000kg/m3—12bar1.2106N/m2—2900rpm—120—4.2×103J/kgOD—62mmID—45mmBD—50mmFSP—188NA=/4622-452=1429mm2B=622-502/622-452=0.74F=[12105142910-6(0.74-0.5)+188]0.07=41.97NMD=62+45/2=53.5mmv=53.510-32900/60=8.12m/sP=41.978.12=340.80WQsealheat=340.80J/sQheatsoak=0.24950(160-120)=498J/sQinj=(340.80+498)/(100034200)=6.6610-5m3/s=4L/min8L/min510APIPLAN11121331Qinj=Qsealheat/(TC)APIPLAN21223241Qinj=(Qsealheat+Qheatsoak)/(TC)QsealheatPcooler=Qsealheat+Qheatsoak26[1]API682