摘要：１－２折流换热器流体温度沿程变化及其ＬＭＴＤ的计算梁日忠ＴＨＥＶＡＲＩＡＴＩＯＮＯＦＦＬＵＩＤＴＥＭＰＥＲＡＴＵＲＥＡＬＯＮＧＳＩＤＰＡＳＳＡＮＤＴＨＥＣＡＬＵＡＴＩＯＮＯＦＬＭＴＤＩＮ１－２ＢＡＦＦＬＥＨＥＡＴＥＸＣＨＡＮＧＥＲ１前言换热器设计中，...

摘要：In the first part of this paper, a simplified approach to design a Shell & Tube Heat Exchanger [STHE] for beverage and process industry application is presented. The design of STHE includes thermal design and mechanical design. The thermal design of STHE involves evaluation of required effective surface area (i.e. number of tubes) and finding out log mean temperature difference [lmtd]. Whereas, the mechanical design includes the design of main shell under internal & external pressure, tube design, baffles design gasket, etc. The design was carried out by referring ASME/TEMA standards, available at the company. The complete design, fabrication, testing and analysis work was carried out at Alfa Laval (India), Ltd., Pune-12. In the second part of this paper detail view of design optimization is presented by flow induced vibration analysis [FVA].

摘要：通过采用Aspen Hysys化工模拟软件对目前最常见、流程简单、机组少、投资相对较低的混合冷剂循环制冷流程(MRC)进行模拟,分析天然气入口温度、入口压力、天然气组成及高压冷剂(深冷冷剂)压力、冷剂组成对压缩机功耗、循环水耗量、冷箱的对数平均温差(lmtd)和冷箱最小温差的影响。结果表明,降低天然气入口温度、提高入口压力、原料气中甲烷含量增加(天然气总量不变)、降低高压冷剂压力及降低冷剂中甲烷的相对含量(冷剂总量不变),均有利于降低压缩机的功耗及循环水用量。