The best on-site power systems
for producing high volumes of process steam are combustion turbines.
Large recip engines can produce low-pressure steam (5 - 15 psi) from
the engine and medium pressure steam (up to about 150 psi) from the
exhaust, but also produce a lot of hot water along with the steam. If
your thermal needs are all steam, or mostly high pressure steam, then
a combustion turbine will probably
be your best option.