Steam Boiler Sizing 1

[Basil_sa]

Hi,

I am a new engineer in my first job and I have been asked to source a steam generator for a biogas power plant. Can anyone give me some pointers on how to calculate the electrical output achievable from the generator? I think I have calculated the boiler capacity correctly - I used the mass flow rate of fuel to the boiler and the HHV of the fuel to calculate the energy available for heating, then assumed a combustion efficiency of 90% and a thermal efficiency of 90% to calculate the rate of energy transferred to the water. By using the latent heat of vaporisation at 1.25MPa I found that I would need a 70 tonne/hr boiler at this pressure.

Would it be better to get a boiler that operates at higher pressure?
What temperature does the steam typically enter the turbine after being superheated?
What temperature and pressure will the steam typically be at after passing through the turbine?

I think they are the main details I need to know to estimate the electrical output available... please correct me if I am wrong.

Thanks in advance,

Basil

 

[LittleInch]

Also try this from the other end - I.e. the turbine guys.

You probably need to talk t people like this

https://peterbrotherhood.com/wp-con...otherhood_Steam_Turbine_Solutions_lowres2.pdf

It looks like there is a market sector up to 40MW so don't limit your search to 50WM+

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Basil_sa]

Brilliant they look great, will get in touch with them. You are very helpful I appreciate it!

 

[MJCronin]

Here is some good information from LMOP ...

You will notice that steam turbine applications are small, few AND most are between 2-10 MWe projects

https://www.epa.gov/lmop/landfill-gas-energy-project-data

MJCronin
Sr. Process Engineer