After compression, the temperature of the nitrogen increased by 9 degrees after passing through two elbows! ! ! ! ????
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This post was last edited by touchskyyy on 2011-6-30 at 17:24. The temperature of the gas flowing out of the aftercooler of the nitrogen compressor increased by 9 degrees Celsius after passing through two elbows and a 9-meter straight section of pipe. Please analyze the reasons. The compression volume of the nitrogen compressor is 41,950 standard m³/h, the outlet pipe diameter is 265 mm (after accounting for the pipe wall thickness), and the pressure of the nitrogen is 3.0 MPa (gauge pressure). The calculated flow velocity is approximately 7 m/s. The cooler located after the nitrogen compressor is a shell-and-tube cooler, with the gas flowing through the tubes and water flowing through the shell. At 40 cm from the cooler outlet, when a elbow was touched by hand, the temperature on the side with the larger radius was significantly higher than that on the side with the smaller radius. Please analyze the reasons.
High-speed gas scouring the side with the larger radius of the elbow reduces its kinetic energy; friction generates heat, causing the temperature to rise
When asked the design institute, they replied that the flow rate was within the normal range. They analyzed that it might be due to individual tubes in the cooler being blocked or to short circuits in the water pathways, resulting in uneven heat exchange. But if friction were the cause, that would be an exaggeration – after all, over time the elbows would surely get worn away given such a large temperature difference.