Heavy duty vs. Aeroderivative

[Batu]

Hi Everybody,

We have a power plant project approx 60-70 MWe. Our priority is having stable and continous energy for a car factory. The factory consumes app. 30 MWe and the lefties will be sold through the distribution grid..
We are considering two different turbines.One of them is a Heavy duty turbine and the other is an aeroderivative turbine ( Which is far cheaper )

Considering the process of a car factory ( With lots of Robots and PLCs ) frequency and load shedding without outage is very important for us..

What shall we do ?
Thanks in advance...
Batu

 

[MikeHalloran]

If uptime is so important, why are you designing in a single point of failure?



Mike Halloran
Pembroke Pines, FL, USA

 

[ScottyUK]

70MWe is at or just beyond the limit of what a single aero-derivative can achieve. As a comment for discussion, I'd choose three or four smaller units giving N+1 redundancy.

We have a fleet of 8 heavy gas turbines and one aero derivative. The aero machine is a pain in the ass w.r.t. availability and resilience. The basic GE engine is good, but the auxiliaries are ,umm, less good. Look very carefully at what you get with the machine - the reliability chain is only as good as the weakest link, and some of the links in our unit are very weak indeed. The control system and instruments are probably the worst offenders. The heavy turbines by contrast are very resilient in terms of construction and in ability to deal with failure of non-critical components and keep going, or in in-built redundancy for critical items. But they are expensive too.




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One day my ship will come in.
But with my luck, I'll be at the airport!

 

[Batu]

Hi again,
First of all many thanks for the answers they are very helpful.
I forgot to mention that the plant will be 1+1. ( Let's say 43-45+22 MW)
During the turbine inspections it is possible to get energy from the grid and our customer accept the possibilities. But the thing is if anything happens in the grid during our operation we may lost 30MWe ( 50% of the total production) and as far as I know this can effect the aeroderivative but heavyduty...
Thanks again for the answers...
Batu