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

Heat loss estimate for plume rise of flue gas

Heat loss estimate for plume rise of flue gas

Heat loss estimate for plume rise of flue gas


I hope you can help me with the following problem.

A large natural gas fired power plant producing 300 GW of power releases sulfur dioxide(S02) during its operation. The S02 is released from a 40 m stack at a rate of 20 g/min. The average wind speed is 12 m/s, with strong solar radiation. What is the distance downwind of the plume centerline emission point at which the predicted 502 ground-level concentration falls to about 2 ug/m3?

I have the equations for Gaussian modeling of the concentration plume distribution and the stability class parameters. My question is how to estimate the plume rise and finally calculate the effective stack height. With no information about flue gas temperature or other, I think I should use the power produced by the plant to estimate the heat loss in dry flue gas and therefore the plume rise, but couldn't find any satisfactory relation.

Any ideas on how to work with the given data?

Thanks so much!

RE: Heat loss estimate for plume rise of flue gas

Slow release non turbulent Gaussian and turbulent jet release plume pollutant release profiles are modelled on commercial simulators like PHAST. Shell uses its own simulator FRED. It may be possible to get a short term user license for these simulators, else ask a local engineering contractor company which has an active technical / process safety department.

RE: Heat loss estimate for plume rise of flue gas

Thanks, georgeverghese.

This is actually an exercise as part of an engineering test, so the use of simulators is not an option. The iteration is supposed to be by hand and I have the equations and constants for that, but not much data (other than what I posted) to estimate the plume rise.

RE: Heat loss estimate for plume rise of flue gas

To get the mass rate or the temp of the flue gas, you could approximate this flue gas to largely air. If you know the mass rate, you could work out the flue gas exit temp, given the specific heat of air.

RE: Heat loss estimate for plume rise of flue gas

I am perplexed about your problem as you heading states heat loss estimate and inyour OP you state concentration level at certain distance from source, so what is it?

RE: Heat loss estimate for plume rise of flue gas

To get the waste heat exhausted, you'll need the design case value for the net thermal eff (NTE) of this power plant at the design case power generation of 300GW ( btw, I find this power gen rate to be somewhat incredible). If NTE is say 80% for a combined cycle power gen plant (it may be around 30% for an open cycle), then waste heat rejected to the stack would be (300/0.8)*0.2 = 75GW. If you then know the mass rate of the flue gas from all the gas turbines, you can then work out the exit flue gas temp as suggested earlier.

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


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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