Why does uneven heating and cooling easily cause vibrations? What's the harm? How to prevent it?
Thread Content
In chemical production, due to high temperature and other process conditions, heating is required. However, during the heating process, everyone has relevant experience or experience, that is, due to uneven cold and heat, or insufficient steam drainage, it is easy to cause vibration! And sometimes the vibrations are so severe that it sounds scary! I would like to ask, why is it easy to cause vibrations due to uneven cold and heat? What harm does this kind of vibration do to equipment and facilities? How to prevent, please give us your advice!
The vibration caused by insufficient steam drainage is water hammer. The force of water hammer is quite large. In addition to noise, it can even penetrate the pipeline. Prevention means draining all the water, choosing a suitable steam trap, and heating the pipes slowly when steam is first added to the pipeline. I don’t quite understand your “uneven hot and cold” problem. Isn’t it the same reason as steam drainage?
1. For equipment, hot and cold changes are large and temperature changes rapidly. Due to the influence of thermal expansion and contraction, there will be noise, which will be harmful to the equipment. Therefore, it is best to heat up the equipment slowly. 2. The sound of steam carrying water is called water hammer, which will cause great damage to pipelines, equipment, and professional titles, and must be resolutely avoided.
What the poster is talking about is the phenomenon of cold shock and water hammer.
For example, if a glass-lined reactor suddenly drops from high temperature to low temperature or rises from low temperature to high temperature during use, it will easily cause the glass to explode if used for a long time. Large temperature changes in the pipeline can cause leakage at the sealing gasket. Therefore, the speed of temperature change must be controlled. As long as one of the hot and cold substances is eliminated, the vibration can basically be eliminated.
Is the poster referring to the heat exchanger equipment? Generally, if the wall temperatures of hot and cold fluids are too different, measures such as adding expansion joints to reduce stress, adding baffles or support plates to the heat exchanger should be considered.
Is the poster referring to the heat exchanger equipment? Generally, if the wall temperatures of hot and cold fluids are too different, measures such as adding expansion joints to reduce stress, adding baffles or support plates to the heat exchanger should be considered.
Regarding the issue of the enamel tank exploding or being damaged, it reminds me of the question of what to do if the enamel reactor is damaged! Thank you so much!
As the poster on the second floor said, the main reason is that the accumulated water in the equipment has not been completely removed. The water temperature and steam temperature in the original equipment are quite large, causing the condensed water to instantly vaporize into steam and become water droplets. In order to reduce the occurrence of this situation, you can choose the following methods to improve it: 1. Complete drainage of the equipment 2. Reduce the pressure of the steam to reduce the temperature difference 3. Reduce the amount of steam added. After the temperature increases, increase the amount of steam.