6 replies to this topic

[Kentucky08]

Good day, everyone,

I am currently calculating the chilled water capacity required for our Methanol Refining Unit. The chilled water will be supplied to the total condenser. From this, we can conclude that the capacity of the chilled water will depend on the methanol vapor fed into the total condenser.

Before reaching the total condenser, the vapor will first pass through the first condenser. In the first condenser, most of the methanol will condense, and the vapor will exit from the upper part of the shell to be directly fed into the total condenser for further methanol recovery.

I have the temperature of the methanol vapor feed and the temperature of the uncondensed methanol that will be fed into the total condenser. Additionally, I have the design data for both condensers, including the number of tubes, tube orientation, pitch, length of tubes, tube size, and shell diameter.

My question is, with this data—particularly the temperature of the uncondensed methanol (i.e., the methanol that will be fed into the total condenser)—can I calculate the amount of methanol vapor fed into the total condenser?

[breizh]

Hi,

Performing   mass and heat balances on the units together with design data available (heat duty) you should get your answer.

I encourage you to prepare an excel sheet and submit to us for review.

Good luck

Breizh 

[Pilesar]

The uncondensed methanol is based on the performance of the cooling water exchanger. I would first model the cooling water exchanger as fully fouled and perhaps with 10% of the tubes plugged to see how much outlet vapor would be expected. Are you designing the chiller exchanger? The chilled water system? Or just determining the utility cost? The chilled water flow through the exchanger may need to be much greater than the minimum required in order to handle upset cases. Determine what would happen if the cooling water condenser had inadequate performance for some reason. Design the chilled water exchanger and flow considering the consequences. 

[Dacs]

Why I feel I've seen this asked elsewhere (in Reddit)?

 

And my answer there won't be any different. Unless you have the chilled water data, then no. You need to perform an energy balance to predict the MeOH feed to condenser.

[Kentucky08]

Hi, Sir. 

 

I sent a personal message to you, I attached my excel sheet. Hoping for your help!

Hi,

Performing   mass and heat balances on the units together with design data available (heat duty) you should get your answer.

I encourage you to prepare an excel sheet and submit to us for review.

Good luck

Breizh 

[breizh]

Hi,

Better to share with the community.

BTW nothing attached in your message.

Breizh

[Kentucky08]

Good day, everyone,

I am currently calculating the chilled water capacity required for our Methanol Refining Unit. The chilled water will be supplied to the total condenser. From this, we can conclude that the capacity of the chilled water will depend on the methanol vapor fed into the total condenser.

Before reaching the total condenser, the vapor will first pass through the first condenser. In the first condenser, most of the methanol will condense, and the vapor will exit from the upper part of the shell to be directly fed into the total condenser for further methanol recovery.

I have the temperature of the methanol vapor feed and the temperature of the uncondensed methanol that will be fed into the total condenser. Additionally, I have the design data for both condensers, including the number of tubes, tube orientation, pitch, length of tubes, tube size, and shell diameter.

My question is, with this data—particularly the temperature of the uncondensed methanol (i.e., the methanol that will be fed into the total condenser)—can I calculate the amount of methanol vapor fed into the total condenser?

I've attached my excel calculations, I am hoping for your kind comments and corrections. I am sure i will be committing a lot of mistakes since I am still new in the industry.

 

Thank you,

Khen

Attached Files

•  Chilled Water Requirement for Review.xlsx   28.91KB   74 downloads