Gas turbines, 0% load

[micsi]

Hello everyone,

My question is regarding the gas turbines working load range.

Before I start, I am a mechanical engineer, so, my understanding of electrical science is limited.

So, now, for the question:

If my gas turbine has a working range between 0-100%, and I have a waste heat recovery boiler behind it, does that mean, when it is not connected to the grid (0% electric energy), that it can work just as a hot gas source for WHRB?

What I don't understand, from mechanical point of view, is, how can the turbine still rotate at 0%, but not produce any electric energy in the generator? Where is the mechanical energy from rotation of the turbines spent? Part is consumed by compressor, but what happens with the rest?

Question might be stupid, but I really can't grasp this, most likely, basic concept.

Thanks in advance.

[mukhriz]

kinetic energy of the rotating masses. ( there is no stupid question, but there maybe stupid answer)

this forum apart from what it is being used today, it should be a place where we can exchange and give comment/ answer for this kind of post.



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[micsi]

I know about kinetic energy, at normal loads it is used to generate electrical energy in generator.

What happens in case that we have a turbine that is rotating (alongside with the generator), but no electricity is produced? That concept confuses me, since where is that then energy spent?

[mukhriz]

Energy In = Energy Out. In this case it is preserve in the mass itself and part of it as kinetic energy,losses etc. to maintain the equation in equilibrium.

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