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Closed cooling tower is not a net drain Cause Analysis
Release date：2015/5/22
Crossflow fluid coolers due to their advantages in low noise, low energy consumption, and is increasingly becoming a common closed cooling tower tower. The so-called cross-flow, measured from the side of the tower into the wind, the air in the direction of flow of the heat exchanger and a water spray to approximately 90 °, air across the tube sheet, but the cooling water pipe in the general direction of the flow tube and air flows to the contrary, continued to show a counter-current state.
Various cross-flow cooling tower closed, although the heat exchanger module vary, but there are common characteristics, the heat transfer tubes snake-tube sheet is generally a set of parallel straight tube plus U-shaped bend composed of each segment parallel to the vertical manifold, each segment with the horizontal plane with a small angle, so that the cooling water inlet side is slightly higher than the cooling water outlet side to turn on the water and turned on the exhaust when disabled, and help guide the wind ( overhead suction fan is set).
Closed cooling towers for heat exchanger tube sheet type device, in order to avoid the cold weather the cracking tube sheet, stopping when the circulating water pipe chip exclusion. But now ubiquitous cross-flow fluid coolers and slow drainage problems resulting from the net did not break the cracking tube sheet, in addition, since the drainage net, even without the cracking, if the local icing tube, water hammer phenomenon can also cause power burst pipe and other machine failure, so the cracking crossflow fluid coolers frequent failures in real use, whether domestic or foreign brand brand without exception.
Solve this problem the most fundamental way is to put water inside the tube sheets clean, so the research and solve the drainage problem segments, not only of theoretical significance to study unsteady flow, and more practical application value.
We get inspiration from the drainage pipes generally, and the inclination angle of the drainage flow or not related to the pipeline, drainage pipes laying when they are required to have a certain inclination. For drainage channels, such as sewage pipes, pipelines and other industrial waste, design manual for its minimum slope has limitations and instructions. Based on this, we change the angle of inclination in the experiment segment, research drained at different angles, including the size and the speed over the water drain much. And on this basis of a theoretical analysis, solution.
