摘要
以某型卧式冷凝器作为研究对象,提出了一种适用于卧式冷凝器的开槽防冲板。采用壁面冷凝模型,对该冷凝器壳侧进行三维数值模拟,分别研究了防冲板高度和开槽长度对壳侧冷凝换热性能的影响。模拟结果表明:在满足国标的设计要求下,卧式冷凝器防冲板最佳构型为长100 mm,宽100mm,高20 mm,沿换热管横向开槽,内槽宽5 mm,外槽宽8 mm,槽长25 mm,整体开孔率为0.31,此时换热效果最佳。对工业级别的卧式冷凝器壳侧冷凝进行了三维模拟,模拟结果与试验数据吻合较好,平均偏差为8.9%,具有一定的工程运用价值。试验结果表明:在壳侧进口流速为10.6 m/s时,添加优化后的开槽防冲板,冷凝换热系数平均可提升12.1%。研究结果为管壳式冷凝器壳侧冷凝强化以及防冲板结构设计研究提供了参考。
Taking a horizontal tube-shell condenser as the research object,a perforated impingement plate( PIP) is presented for the horizontal condenser. The wall condensation model is used to simulate the condensation of the condenser shell side. The influences of the height and slot length of the PIP on the condensation heat transfer performance of the shell side are studied respectively.The simulating results show that under the requirements of national standard,the optimum PIP's structure is 20 mm high,100 mm wide,100 mm long,slotting along horizontal of heat exchange tube,5 mm inner slot wide,8 mm outer slot wide,25 mm slot long,and opening rate of 0. 31. Three-dimensional simulation is made on the condensation of the condenser shell side in industrial grade,and the simulation results and test data coincide well with average deviation of 8. 9%,which has engineering application value. Experimental results show that the shell side condensation heat transfer coefficient of the condenser can be increased by 12. 1%,compared to the one without PIP,which provides a reference for the shell side condenser condensation enhancement and the design of the impingement plate structure.
出处
《能源化工》
2017年第6期42-47,共6页
Energy Chemical Industry
基金
国家自然科学基金项目(51406081)
关键词
防冲板
冷凝强化
数值模拟
优化设计
试验验证
impingement plate
condensation enhancement
numerical simulation
optimum design
experimental verification
