Superheater Evaluation

[jcoots]

What's your advice?

I have a 100,000#/hr blr. operating at 225psi saturated. I am considering adding a superheater at 500 F. I am trying to calculate an expected horsepower increase by doing this.
I do know efficiency will come into play at some point.

I am thinking that I should use 2nd Law:
m(h_i - h_e)=Wnet-Qin.

Am I on the right track?

 

[rmw]

There are formulae out there for boiler horsepower that you can probably find on Google. I rarely use horsepower as a measure of boiler output unless dealing with smaller fire tubed type boilers similar to laundry boilers. At your output and pressure my guess is yours isn't one of those.

By adding a superheater, you will be wringing more heat (work) out of the flue gasses so your boiler efficiency is going to go up based on heat (work) out vs. fuel in. Figuring that out is a first law calculation. Expressing that as boiler horsepower for a boiler your size is strange to me.

rmw