Base Load
Base Load
(OP)
What is base load? How does one determine the base load for a gas turbine?
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RE: Base Load
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If we learn from our mistakes I'm getting a great education!
RE: Base Load
Usually plants that are used for peaking or high demand only will have PLF less than 35%.
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Plymouth Tube
RE: Base Load
RE: Base Load
The actual load achieved at "Base Load" depends on the application (fuel, ambient conditions, site elevation, inlet system losses, exhaust system losses, etc.).
RE: Base Load
RE: Base Load
I once heard a peaker plant manager tell a supplier that he only ran ~500 hrs per year and never wanted to exceed 800 hrs/yr because that would throw him into the requirement to install CEMS (Continuous Emissions Monitoring) equipment which also required monthly reporting and he didn't want to do that so he was happy to keep his load factor at below 500 hrs/yr. Now that is a peaker.
Typically speaking, a combustion turbine isn't used in a base load application unless it is used as part of a combined cycle or a co-gen. On a simple cycle basis their heat rate just doesn't permit it. Nuclear plants and large coal units are run as base load units and CT's are brought on and off line to manage the peak loads.
rmw
RE: Base Load
In other cases, the exhaust from a combustion turbine may be used in a process plant. In these cases, the operating temperatures may be unusually low and the operating life can be amazingly long. The seemingly low generating efficiency is more than compensated by the use of the exhaust heat.
As others have indicated, the true meaning of base load is very much application specific.
RE: Base Load
I.e if your temperature limit is 1000C then once you hit that with your guide vanes wide open, then you are at base load
RE: Base Load
Yes, agreed.
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If we learn from our mistakes I'm getting a great education!
RE: Base Load
But then again, that was back when we often had to read the instruction manuals by candle light because there wasn't electricity everywhere.
rmw
RE: Base Load
Peak load is when the GT base load limiting factor has been increased, normally for a limited time, to allow x% more MW. In both cases the GT has hit the limiting parameter and the fuel valve(s) will modulate to keep the EGT or inlet temp to that value. (Assuming the MW setpoint is set abouve actual MW at that point)