[pranabjyoti]

I want to know about a fact first. In conventional thermal power plants, highly-pressurized water is heated and evaporated inside Boiler. But, instead of highly pressurized fluid like water, low-pressure fluid like steam at pressure around 10-12 bars were heated, does the whole process will remain isobaric?
If yes, then I want to know whether a convergent nozzle can be used to inject the steam into comparatively higher pressure of about 45 bars without using much energy or not. Probably some explanation will clear it to the readers. A convergent nozzle can convert internal heat i.e. random motion in velocity in a particular direction. While, we all know that pressure is an expression of velocity of molecules of fluid, whatever kind that may be. So, if a convergent nozzle can convert internal heat into velocity in a particular direction, then the velocity i.e. pressure of steam in the particular direction can be highered at the expense of pressure on other direction. In short, by using a convergent nozzle, we can inject steam at higher pressure without using much energy at the compressor.
I want to know how much right I am in this regard.