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

Natural Gas for steam boiler

Natural Gas for steam boiler

Natural Gas for steam boiler

Hi All:

I'm making some ball park figure calculations to estimate how much a laundry steam press would represent in terms of natural gas consumption at the steam boiler but I'm getting some numbers that don't seem right, but I can't find where my potential mistake might be.

Steam press consumption: 3kg/h
he:2,107 kJ/kg-5 bar saturated steam Specific enthalpy evaporation
Estimated steam boiler and distribution efficiency: 0.85
Natural Gas Density: 0.80kg/m3
Natural Gas Calorific Power (kW/kg):14.5
Heat Transfer rate of a steam condensing system:
q(KW)=he*steam flow rate (Kg/s)
24/7 operation

q=1.76 kW equivalent to q(year)=15,382kW/year
Total NG (kg) needed to produce steam: 15,382/14.5/0.85=1,248 kg of natural gas-equivalent to 1,560m3 NG per year

It has been quite a while since I did this type of exercise so I'm afraid I'm missing something.

Is my approach correct?

Thanks a lot for your help on this.

RE: Natural Gas for steam boiler

I didn't go through your numbers, but I would approach this as a two part problem.
1. heat rate of boiler, how much gas is required to make some quantity of steam at some enthalpy
2. The steam consumption of the unit corrected for distribution and change in enthalpy

You should be able to reasonably verify each of these independently, make it easier.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: Natural Gas for steam boiler

Just off the top, 1560 m3 in a year is 6.29 cubic feet per hour, which is about 6290 btuh. That is not even the size of a small domestic water heater.

RE: Natural Gas for steam boiler

I seem to recall having heard somewhere that for such small quantities of steam an electric boiler is sometimes the most cost-effective solution, depending upon energy costs and the A or A's HJ.


"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]

RE: Natural Gas for steam boiler

Quote (MedicineEng)

q=1.76 kW equivalent to q(year)=15,382kW/year
The figure 15382 should be kWh/year=55.38x10^6 kJ/year
Natural gas heating value should be close to 40,000 kJ/kg

So your yearly natural gas consumption should be 55.38x10^6/0.85/40000=1629 kg/year

Engineers, think what we have done to the environment !https://www.linkedin.com/in/goutam-das-59743b30/

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