气流量G2,r为'2t时的汽化潜热r=2763.5J/kg水蒸气流量:沈阳化工大学科亚学院学士学位论文第一章换热器传热工艺计算3??????η)]''([2202ttCprQGi)]8097.164(3^10258.43^105.2763[98.07^109613.1???????=6.4kg/s冷却段传热量:wttCpGQi0498.238500)8097.164(103258.44.6)''(2222??????????冷凝段传热量:wrGQ17686400105.27634.6322??????设冷凝段和冷却段分界处的温度为3t根据热量衡算:)('13112ttCpGQ??????·η?????'CpG11123tQt?4.571086280000062397619201000178.4260000360098.076864001??????℃1.4有效平均温差计算逆流冷却段平均温差:nt???????)''''ln()''()''(321321ttttttttii??????4.57808597.164ln4.57808597.16453.456.2297.79ln6.2297.79??℃逆流冷凝段平均温差:△nt'????????????2097.1644.5797.164ln2097.1644.5797.164)''ln()'()'(132132ttttttttii5.13897.14457.110ln4.37??参数:25658.057.1076.274.5797.1644.5785''331????????ttttPi参数:0786.36.2797.844.57858097.164''''312????????ttttRi换热器按单壳程2管程设计则查图2-6(a),得:温差校正系数?=0.84有效平均温差:℃2.3853.4584.0???????nmtt?
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