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横管初冷器计算书1.原始资料1.1煤气处理量:35000m3/h1.2两段冷却,带断液盘,上段:循环水段,煤气82℃→40℃,循环水32℃→45℃下段:低温水段,煤气40℃→21℃,低温水16℃→23℃1.3进口煤气总焓556kcal/Nm31.4当地大气压力89.7kPa(9142mmH2O),煤气露点80℃(按当地大气压力计算)2.横管初冷器的计算2.1煤气在各温度下的总焓及水汽量温度t℃水蒸汽分压mmH2O水蒸汽含量g/m3干煤气热焓kcal/m3水蒸汽热焓kcal/Kg水蒸汽密度Kg/m3煤气总焓kcal/m3835445905.629.88632.50.3284602.68825233832.829.52632.10.3164556.02804828712.528.8631.30.2933478.578.54542637.528.26630.70.2771430.36774269571.327.72630.10.2615387.623867356.4313.68613.90.0462348.282634227.659.36608.60.0243724.772.2热量平衡2.2.1上段(按露点80℃核算),设煤气出口温度82℃输入热量a)煤气带入热量Q1=35000X556.02=19460700kcal/hb)热水带入热量Q2=925X1000X32=55500000kcal/hQ入=Q1+Q2=91641300kcal/h输出热量c)煤气带出热量Q3=65000X387.62=25195300kcal/hd)热水带出热量Q4=925X1000X70=64750000kcal/he)冷凝液带出热量Q6上段的冷凝液量为65000X(832.8-571.3)/1000=16997.5Kg/h(22693.5Kg/h),温度75℃Q5=16997.5X75=1274812.5kcal/h(1702012.5kcal/h)Q出=Q4+Q5+Q3=91220112.5kcal/h(91647312.5kcal/h)误差:(91641300-91220112.5)/91220112.5=0.46%(0.007%)2.2.2上段(按露点80℃核算),设煤气出口温度78.5℃,煤气进口总热焓按602kcal/Nm3输入热量a)煤气带入热量Q1=65000X602=39130000kcal/hb)热水带入热量Q2=925X1000X60=55500000kcal/hc)煤气中水蒸汽含量为65000X(18/22.4)X4828/(9143-100-4828)=59828Kg/hQ入=Q1+Q2=94630000kcal/h输出热量d)煤气带出热量Q3=65000X430.36=27973400kcal/he)热水带出热量Q4=925X1000X70=64750000kcal/hf)冷凝液带出热量Q6上段的冷凝液量为59828-65000X637.5/1000=18390.5Kg/h,温度76.5℃Q5=18390.5X76.5=1406873kcal/hQ出=Q4+Q5+Q3=94130273kcal/h误差:(94630000-94130273)/94130273=0.53%温差△t=(17-10)/ln(17/10)=13.19℃(14.355℃)[13.817]80(82)→77[78.5]传热系数K=350kcal/m2.h70←6010(12)17[18.5]面积=925X1000X10/(350X13.19)=2004m2(1841m2)[1913m2]2.2.3中段输入热量a)煤气带入热量Q1=27973400kcal/hb)循环水带入热量Q2=28G1kcal/hc)喷洒液带入热量,因喷洒液进出口温度接近,其热量忽略不计(按石家庄消化报告)d)冷凝液带入热量Q3=1406873kcal/hQ入=Q1+Q2+Q3=29380273+28G1kcal/h输出热量e)煤气带出热量Q3=65000X48.28=3138200kcal/hf)循环水带出热量Q4=45G1kcal/hg)冷凝液带出热量Q5上段的冷凝液量为18390.5Kg/h中段的冷凝液量为65000X(637.5-56.43)/1000=37769.55Kg/h温度36℃Q5=(18390.5+37769.55)X36=2021762kcal/hQ出=Q3+Q4+Q5=5159962+45G1kcal/h{12373821+45G1kcal/h}Q入=Q出29380273+28G1=5159962+45G1循环水量G1=1424724Kg/h≈1425m3/h温差△t=(33.5-10)/ln(33.5/10)=19.438℃78.5→38传热系数K=200kcal/m2.h[210kcal/m2.h]45.0←2833.510面积=1424724X17/(200X19.438)=6230m2[5934m2]2.2.4下段输入热量a)煤气带入热量Q1=3138200kcal/hb)低温水带入热量Q2=16G2kcal/hc)喷洒液带入热量(31.78℃)Q3=65X1000X31.78=2065700kcal/hQ入=Q1+Q2+Q3=5203900+16G2kcal/h输出热量d)煤气带出热量Q4=65000X26.14=1699100kcal/he)低温水带出热量Q5=23G2kcal/hf)冷凝液及喷洒液带出热量Q6下段的冷凝液量为65000X(56.43-27.65)/1000=1870.7Kg/h,温度24℃Q6=(1870.7+65000)X24=1604897kcal/hQ出=Q4+Q5+Q6=3303997+23G2kcal/hQ入=Q出5203900+16G2=3303997+23G2低温水量G2=271415Kg/h≈271m3/h温差△t=(15-10)/ln(15/10)=12.33℃38→26传热系数K=70kcal/m2.h23←161510面积=271415X7/(70X12.33)=2201m2所需总面积:1913+6230+2201=10344m2,共三台,每台5200m22.3冷凝液槽:初冷器来的冷凝液:1870.7Kg/h;56.6293Kg/h去初冷器的喷洒液:上下段65000X1/1000=65m3(65t/h),其中焦油65X0.5=32.5t/h对入焦油量(石家庄为补充含水焦油占喷洒量5%)65X10%=6.5m2(6.5t/h)66.8707X24+56.6293X36+6.5X75=130tt=31.78℃初冷器自流去机械化氨水澄清槽的冷凝液:64.5407t/h2.4上段(按露点80℃核算)采用循环水冷却所用循环水量G循上=925X10/17≈544m3/h温差△t=(50.5-35)/ln(50.5/35)=42.277℃80→78.5传热系数K=350kcal/m2.h[250kcal/m2.h]45←283550.5面积=544X1000X17/(350X42.77)=618m2[865m2]2.5按两段计算2.5.1循环水段输入热量a)煤气带入热量Q1=65000X602=39130000kcal/hb)循环水带入热量Q2=28G1kcal/hc)喷洒液带入热量,因喷洒液进出口温度接近,其热量忽略不计(按石家庄消化报告)Q入=Q1+Q2=39130000+28G1kcal/h输出热量d)煤气带出热量Q3=65000X48.28=3138200kcal/he)循环水带出热量Q4=45G1kcal/hf)冷凝液带出热量Q5温度36℃Q5=(18390.5+37769.55)X36=2021762kcal/hQ出=Q3+Q4+Q5=5159962+45G1kcal/hQ入=Q出39130000+28G1=5159962+45G1循环水量G1=1998238Kg/h≈1998m3/h温差△t=(35-10)/ln(35/10)=19.956℃80→38传热系数K=200kcal/m2.h[250kcal/m2.h]{220kcal/m2.h}45←283510面积=1998238X17/(200X19.956)=8511m2[6809m2]{7737m2}2.5.2低温水段:同上2.5.3所需总面积:8511+2201=10712m2,共三台,每台5000m2
本文标题:横管初冷器计算书
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