Designing the Steam Power Plant Parts

You can go through CFD analysis for your steam power plant. It can help you to analyze steam flow and Multiple Phase Flow as per your requirement.

Your best bet is to hire people that have done it before.

if you need to ask the project is over your head. hire a consultant

That sounds like an awfully small steam plant. Are you sure?

Unfortunately you can't. Hire someone to do this for you, what you ask is unbelievably dangerous and illegal if you intend to sell the parts.

Sir....

A 100kw (0.1 MWe) is far too small to utilize a Rankine steam-cycle power plant. Economic steam cycle plants begin to make sense at about 10 MWe.... and only if the heat is free (waste heat boiler utilized)

If you need to generate small amounts of power, consider a diesel generator. These are commonly used from about 0.1 to about 3 MWe power generation range.

You should also consider the duty cycle of your generation equipment. Will this be full-time, part time or emergency service ?

Many acceptable used diesel gen-sets are available on the market

I never saw a 100 kW powerplant with steam turbine. The only common application of such small steam turbines I remember are emergency pumps or so, they look like toy steam turbines but they're expensive.

Steam system design is a science and requires a high level of knowledge, just have a look at real P&ID of thermal powerplants (I mean the real process diagrams, not the simplified ones shown by teachers/professors or seen in many books) and many subtle execution details are not visible in those diagrams.

When Plimos says:

"Steam system design is a science and requires a high level of knowledge " I believe he means that you need experienced engineers to develop a complete and safe design