Reboiler issue (urgent)
Thread Content
As a type of steam heater, the standard design for a reboiler should be: a self-regulating valve is installed on the steam pipeline, while a group of drain valves is installed on the condensate pipeline； But in our section, the reboiler has the automatic control valve installed on the condensate line, with no steam trap assembly provided! ! ! I’m quite confused and would like to ask the experts: In a reboiler, is heat exchange mainly with steam, or with condensed hot water? ； In other words, what should be the optimal level of water in the shell side of the reboiler? ? Also, our reboilers often experience water hammer. Could you explain the reasons and the solutions? ? ! ·! ! !
The reboiler has the automatic control valve installed on the condensate line, without a steam trap assembly – this is an option available in the design; it mainly depends on how the PID control for your facility’s system is configured. Whether to place the control valve before or after the discharge corresponds to different PID setting methods. Steam heat exchange generally makes use of its latent heat; the water hammer you mentioned is likely related to the fact that check valves have not been installed.
The shell-side water level of the reboiler is related to properties such as the temperature of the medium being heated; if its temperature is low, the steam entering will definitely condense, resulting in water hammer. Suggestions: 1. Increase the temperature of the medium to be heated. 2. If the heat demand remains stable, one can try increasing the flow rate of the condensate and reducing the manual valve on the steam inlet (if it is present) as a solution.
So far, the method we have used is the one mentioned on the third floor! ! I just want to ask further: in order for the reboiler to achieve the best heat transfer performance ； What is its water level usually like? ? ?
Continuing from the 5th floor: In other words, the reboiler is primarily used for heat exchange between the water in the shell side and the fluid in the tube side! ! At the beginning of operation of the reboiler, hot pipe drainage is carried out primarily to raise the temperature and achieve equilibrium between the gas and liquid phases (dynamically)! ! Also: Should the inlet pipe of the reboiler be higher than the inlet interface of the shell side? Is that correct? ?
Is this post going to sink? ? I hope experts will keep coming in to offer guidance
While maintaining the water level, increase the condensate outlet and reduce the steam inlet. Install a steam trap at the condensate outlet!
If the tube bundle is submerged, then can the tubes come into contact with steam?
After the reboiler generates steam, a gas-liquid separation tank is placed after the automatic control valve; the water flows directly into the reboiler while the steam goes into the regeneration tower, thereby preventing water hammer, and the liquid level is sufficient to cover the tube bundle. However, our design target is 70%, but many of our teams prefer to keep it around 50
To answer this question, (for a reboiler to achieve the best heat transfer performance； What is its water level usually like? ) In terms of design, the liquid level in the shell side of a reboiler is generally maintained at around 30%–60%. Because heat transfer in the reboiler relies mainly on latent heat, the heat transfer efficiency will be low if the liquid level is too high or too low.