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首页> 外文期刊>Journal of enhanced heat transfer >STEAM CONDENSATION ENHANCEMENT AND FOULING IN TITANIUM CORRUGATED TUBES
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STEAM CONDENSATION ENHANCEMENT AND FOULING IN TITANIUM CORRUGATED TUBES

机译：钛波纹管中的蒸汽冷凝增强和析出

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摘要

In the present study, three titanium corrugated tubes (22.2 mm O.D. and 0.5 mm tube thickness) having widely different corrugation pitch (2.1 and 22.1 mm) and having the same corrugation depth of 0.2 mm were tested at the steam pressures (from 5 to 10 kPa) of an actual electric utility condenser. Fouling tests were conducted using the silt obtained from an actual power plant site. Fouling control using sponge balls was also examined. Significant enhancement of condensation heat transfer is noted, especially for the 2.1/0.2 tube. The heat transfer enhancement ratios are 4.0 and 2.76 at 5 and 10 kPa, respectively. The tube-side heat transfer enhancement ratios are 1.08,1.06, and 1.03 for the 2.1/0.2, 6.4/0.2, and 22.1/0.2 tubes. The pressure drop penalty factors are 1.56, 1.48, and 1.07 for the 2.1/0.2, 6.4/0.2, and 22.1/0.2 tubes. The fouling test conducted at 1.0 m/s and 2500 ppm concentration revealed that the corrugated tubes fouled faster than the smooth tube. A sponge ball cleaning test on the 2.1/0.2 tube showed that continuous sponge ball injection reduced the fouling resistance to virtually zero.
机译：在本研究中，在蒸汽压力（5至10）下测试了三根钛波纹管（外径22.2毫米，管厚0.5毫米），波纹间距（2.1和22.1毫米）相差很大，波纹深度相同，为0.2毫米kPa）使用从实际发电厂现场获得的淤泥进行结垢测试。还检查了使用海绵球的结垢控制。注意到冷凝水传热的显着增强，尤其是对于2.1 / 0.2管。在5kPa和10kPa时传热增强比分别为4.0和2.76。对于2.1 / 0.2、6.4 / 0.2和22.1 / 0.2的管，管侧传热增强比为1.08、1.06和1.03。对于2.1 / 0.2、6.4 / 0.2和22.1 / 0.2的管，压降损失因子为1.56、1.48和1.07。在1.0 m / s和2500 ppm浓度下进行的结垢测试表明，波纹管的结垢速度比光滑管快。在2.1 / 0.2管上进行的海绵球清洁测试表明，连续注入海绵球会使耐污染性几乎降为零。

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