Power Generation

250psi ≈ 17bar.

From Steam Tables, the latent heat of steam is 1923kJ/kg at that pressure.

Evaporation rate 15000lb/h ≈ 1.9kg/sec.

Boiler nominal power is therefore 1923 x 1.9 ≈ 3600kW

Therefore it is oversized by a factor in the order of 4.5, ignoring distribution and turbine losses.

If 800kW is the turbine requirement than the question <...please advice the best turbine to suit the requirement....> is nonsense.

Most likely the 800 kW required is turbine shaft power, or maybe electrical power if that's the application. Efficiency probably 25 - 30%, so boiler may be oversized, but not grossly.

congrats, you did far more crunching than I would have

Yes, with heat left over for cooking hot dogs.

How many points is a correct answer worth?

Whatever Anonymous Posters produce with their voting buttons?

I've never seen 4 Anonymous Posters. Is this a condensing turbine? Superheated steam?

Who is talking?

IS

Power generation with 250 psi saturated steam using a condensing turbine (if heat from a higher level exhaust is not needed), is not a good proposition. A turbine with reasonable efficiency will produce excessive moisture in the exhaust, leading to high erosion of the turbine. If you are not knowledgeable of these systems, you should hire expert help - there is more involved than you can expect from a bunch of anonymous people.

You need to design the entire system before you start purchasing equipment.