Vibration occurs when the steam flow rate in the shell-and-tube heat exchanger is increased
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Shell-and-tube heat exchanger, vertical type; 10S fluid flows in the shell side. When the 10S control valve is opened wide, significant vibration occurs. Trying both venting at the high point and draining at the low point of the steam pipeline has been ineffective. Currently, the steam flow rate is lower than it used to be. What is the cause of vibration when the steam flow rate is high?
Has the pipe been warmed up properly? How warm is the device?
Actually, vibration is quite normal. Because of the water hammer phenomenon.
This is resonance, right? Can the diameter of the condensate pipeline be changed?
What is to be heated? Has it vaporized?
. . . . . b) Reducing the flow velocity of the fluid in the shell side can lower the frequency of fluid-induced vibrations, which is the most direct method for preventing tube bundle vibration, but at the same time the heat transfer efficiency also decreases; c) Appropriately reducing the spacing between baffle plates, as well as increasing the thickness of the tube walls, can help as well. . . . .
The heat exchanger induced vibration. Consider installing a orifice throttle at the steam inlet; by sacrificing some pressure drop, can we see any improvement?
The internal structure design of the equipment is unreasonable; in cases where steam flows through the shell side, vibration calculations must be conducted during the design of the heat exchanger. When the actual flow rate during operation exceeds the designed value, the heat exchanger needs to be re-evaluated, and operations cannot be carried out blindly. Vibrations are usually caused by excessive flow velocity or too large unsupported spans of the pipes, and they tend to occur at the inlet and at the openings of the baffle plates
The internal structure design of the equipment is unreasonable; in cases where steam flows through the shell side, vibration calculations must be conducted during the design of the heat exchanger. When the actual flow rate during operation exceeds the designed value, the heat exchanger needs to be re-evaluated, and operations cannot be carried out blindly. Vibrations are usually caused by excessive flow velocity or too large unsupported spans of the pipes, and they tend to occur at the inlet and at the openings of the baffle plates
The heat exchanger has been operated for long periods before, with no vibrations occurring. After stopping and restarting, vibration occurred; currently the steam flow is below normal levels