Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

First start up for compressor

First start up for compressor

First start up for compressor

Why we need to start centrifugal compressor with N2 during initial start up in desulfurization unit?

RE: First start up for compressor

Are you referring to recycle gas compressor in a dehydrosulfurisation treating unit (HDT)?

RE: First start up for compressor


RE: First start up for compressor

My guess would be that HDT effluent vapor is almost pure hydrogen at startup. Since H2 is a low mol wt gas, it is likely your compressor is not designed to operate on pure H2. If you did, it wont develop the required exit pressure (even at max speed) and you would also have high discharge temp. So higher mol wt N2 is used and the compressor is operated on close to full recycle until vapor effluent from the HDT reactor has more hydrocarbons and H2S in it.

RE: First start up for compressor

Question is not clear. What is an alternative - air, natural gas of hydrogen? You should clarify your idea.
First start-up is risky as one is not confident that equipment operates properly. Especially such expensive and dangerous equipment as compressor. It is better to risk in inert atmosphere instead of highly explosive, right?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close