Regarding the installation height of the reboiler at the bottom of the tower regenerator?
Thread Content
In a liquefied gas desulfurization regeneration tower, steam is used as the heat source. Generally, the base of the tower is located above the reboiler; the liquid-rich stream in the tower flows into the reboiler due to gravity, where it vaporizes and then returns to the tower as a vapor-liquid mixture. It is necessary that the inlet for this return stream be at a height higher than that of the liquid layer inside the tower. So, does this mean we need to ensure that a certain degree of vaporization occurs of the liquid-rich stream within the reboiler? If there are fluctuations in steam temperature or volume, could the rich liquid bypass the vaporization section and form a liquid seal between the reboiler outlet and the line leading back to the tower? What should be done if this situation occurs? What impact does this have on equipment and production?
This situation is unlikely to occur. Could you draw a piping diagram for discussion? Is there a U-shaped section at the outlet leading back to the inlet? Otherwise, this situation wouldn’t occur.
There is no problem in this case either; once the return port of the reboiler is submerged in liquid, it functions like a kettle-type reboiler. As long as the heat source is sufficient, gas will be generated inside the reboiler, thereby creating a density difference. The reboiler at the bottom of the amine liquid regeneration tower is of the single-pass type; in some cases, such as during startup, it may even be necessary to submerge the reboiler first, establish a reboiler circulation, and then lower the liquid level, if no startup circulation line is provided in the design. Of course, if the liquid level at the bottom of the tank becomes empty while the heat source for the reboiler is still active, it is possible for the liquid to enter the reboiler and cause bubbling that leads to a blockage. In such cases, it is necessary to reduce the heat input until the reboiler is filled with liquid again, after which the heat source can be resumed.
3# facecat: Is it the lean liquid or the rich liquid that flows from the bottom of the regeneration tower into the reboiler? Is the process of regeneration and analysis carried out inside the tower or inside the reboiler?
Desulfurizer regeneration takes place within the tower; the temperature at the bottom of the tower is generally around 125 degrees, depending on the operating conditions. The lean solvent drawn from the bottom of the tower is cooled to around 40 degrees through heat exchange before being fed back into the desulfurization tower for reuse.
5# zhanghui0911 If the separation is carried out inside the tower, then the lean liquid drawn from the bottom of the tower enters a reboiler where it is heated; water vaporizes, thereby changing the density difference, and this vapor is sent back to the tower. Inside the tower, steam is used for stripping in order to achieve regeneration, is that correct?
There should be no problem, as long as the reboiler continues to provide heat. The outlet of the liquid-phase flooded reboiler can also be considered to undergo heat exchange