6 replies to this topic

[Bali]

Hey,
First of all..I have to say this website is most helpful..

So back to my question..
Im currently designing a condensor in a Hydrogen Production Plant that is located before the PSA..its my Design Project..Mass Flow rate is about 120000 kg/hr

Inlet
Temp:380
Pressure:22.5 bar

Outlet
Temp:38
Pressure:20 bar

Was looking into having one heat exchanger to reduce the temperature then the condensor..to remove all water in the stream..need some ideas on how to design the condensor..

I have attached the mass balance..Looked into coulson's and richardson..really need help..Thanks

Attached Files

•  MAss balance condensor.xlsx   10.33KB   20 downloads

[Art Montemayor]

Bali:

As I have specifically stated on many prior Student threads, the Forum needs for you (the Student) to do SOME work on your own problems. You haven't even furnished the proper units on your temperature and pressure values.

Please refer to my Rev 1 of your submitted workbook and read my comments.
Give us a PFD to understand what it is that you are doing. You mention a hydrogen plant, a PSA unit, a cooler, and a condenser. Where and HOW do these different unit fit together???

WHERE - EXACTLY - are YOUR calculations???? All you furnish are a mass balance report from what seems to be a computer print out. These are not calculations. These are compositions that are listed with nine (9) decimal places!! Where is your cooling and condenser heat loads' calculation???

We await your response.

Attached Files

•  Mass Balance Condenser Rev1.xls   32.5KB   28 downloads

[Bali]

Really sorry for the lack of information. Let me edited it and repost it.. Thank You

[Bali]

Dear Art,
Just a question.. if its a partial condensor..and i know i cant remove all water.. How do i go about the calculations?should i include cp average of stream but latent heat of H20?

[Art Montemayor]

Bali:

I don't believe you are dealing with a "Partial" condenser. A partial condenser condenses only a portion of the total condensables. A total condenser condenses all of the total condensables. You have a total condenser application. Of course, there will be some water vapor left in the non-condensables (due to the vapor pressure exerted. You can't condense the portion that exists as vapor pressure (the non-condensables are saturated). Therefore, if you desire to reduce the level of saturation in the non-condensables, you resort to another Unit Operation: Adsorption (Pressure Swing Adssorption - "PSA"). By the way you are using acronyms and other descriptions, I get the impression that you don't know what it is that you are talking - or writing - about. You should have a mastery or complete knowldege of these processes and what they are used for before attempting to "design" one.

Do what I recommended and supply a detailed and legible PFD with all the process conditions noted on it.

[Bali]

Art..I messaged you the things i have completed. Hope you can help me out..Thank you

[Art Montemayor]

Bali:

I cannot (and will not) supply direct, one-on-one help through my messaging service on this Forum. The reason I don't do that is explained by me in a prior thread:

"l do not help other engineers on our Forums on a one-on-one basis. I help a lot of young engineers – especially students – but only on the Forums because in that way, the information can be shared with other students in a quick and efficient manner. One-on-one help is very efficient; but it only helps out ONE student. The Forum can help a much greater amount of students by being open to all members."

I have helped a lot of students on our Forums through the many years I have been here. The reason(s) I have continued to do this is the hope of reaching as many young students - such as yourself - with the same, candid, and factual news and information of what you should do in order to succeed in becoming a successful and satisfied professional engineer. That is why I urge you to upload your information and basic data on this thread where you will receive information and assistance not only from me, but from a lot of other experienced and knowledgeable engineers who also are willing to spend time and effort to help you succeed.