2 replies to this topic

[Otthigh94]

Hello everyone,

 

I have been entrusted with the task of designing a Kettle Reboiler for a pilot plant where a mixture of MEA and water will be used for regeneration (CO2 absorption/desorption). The system comprises a stripper column with packing and an external Kettle Reboiler. A heating element with a length of 800 mm and a diameter of 200 mm (DN 200 flange connection) is already in place. The evaporator is intended to operate at a pressure of 2 bar absolute, with a maximum incoming liquid flow rate of 300 l/h. The temperature is set at 115 °C.

 

 

 

I have already conducted the general calculations and now plan to order the welding parts. However, I am uncertain about how to design the weir, including its height and the height of the liquid level above the heating element. Additionally, I am unsure about the appropriate liquid level above the heating element.

 

I hope that someone can assist me in clarifying these questions.

Edited by Otthigh94, 17 January 2024 - 11:46 AM.

[Pilesar]

Decide how much liquid you want to cover the bundle. Usually this is minimum of 2 inches (50 mm). For foaming service you may want more liquid coverage, perhaps 3 or 4 inches. The liquid level will be higher farther away from the weir and fall as it approaches the weir. You can find simple equations to calculate height of liquid above a weir. To try to minimize liquid bypassing the tubes on the shell side, you can design a rectangular weir so that the flow is forced more to the center of the shell. Your shell should allow enough volume above the liquid level for vapor disengagement. Kettle reboilers are generally pretty forgiving, but there are a lot of details to specify. Look for heat exchanger design references on the internet and start reading. MEA reboilers are not uncommon so you might be able to find a go-by to help. Perhaps ask your heat exchanger vendor for advice also. They want to make a sale and want the exchanger to be successful. If you find a good partner, reward them with some business.

[breizh]

Hi,

On top of Pilesar's recommendation I encourage you and others to use the search engine in this forum to support your query.

Attached a link on similar topic and replies from Art:

https://www.cheresou...s-for-reboiler/

Good luck

Breizh