Anti-vibration measures of marine heat exchanger
Many people have studied the mechanism of fluid-induced vibration induced by marine heat exchangers, but so far no complete anti-vibration design guidelines have been established, and there is no way to require complete anti-vibration design. This also requires that the operation and management personnel should use different measures according to the actual operation to prevent vibration. For the heat exchanger with vibration, it is possible to change the structure of the heat exchanger to prevent vibration by adopting the following methods:
(1) Reduce the shell-side flow rate. When the natural frequency of the heat transfer tube is booked, reducing the shell-side flow rate can avoid exciting resonance. If the flow rate is required to be unchanged during operation, the tube center distance can be increased to reduce the flow rate.
It should also be noted that when a marine heat exchanger is operated, a certain local flow rate cannot be made too large. When it is absolutely necessary, some pipes can be removed to reduce the lateral flow rate. When using this method, it should be noted that the heat transfer characteristics cannot be changed too much.
(2) Increasing the natural frequency of the tube can greatly reduce the chance of resonance. The most effective way to increase the frequency is to reduce the span.
In the marine heat exchanger, the natural frequency of the tube is inversely proportional to the square of the span. If the span can be reduced by 20% at this time, the natural frequency can be increased by 50%. The U-shaped tube section is mainly used to increase the natural frequency. Bands can be wrapped around the tubes or rods can be inserted to stop the tubes from moving.
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Jiangyin M&C Heat Parts Co.,LTD worked in the field of the world marine plate heat exchanger markets, possesses over 5 years of experience in a multitude of marine Projects, serves ships trading in the all corners of the globe, manufactures and distributes spare parts for the offshore and onshore industry, uses state of the art technology in its activities.
