Generator dissipation resistance.
Generator dissipation resistance.
(OP)
I am involved in a 20 MW Generator specification and installation project. I would want to know information about excess power dissipation resistance for generators.
is it a important issue in power generator control or what??
Thanks in advance
is it a important issue in power generator control or what??
Thanks in advance






RE: Generator dissipation resistance.
Regards
Marmite
RE: Generator dissipation resistance.
I saw one attempt to run a small generator (about 50 KiloWatts) at 100% output and use a load bank to dissipate the energy in excess of load requirements.
The system design was not based on sound engineering principles and was an expensive failure in more than one aspect.
The project may some day be the subject of a post in the "Most Outrageous" thread in Engineering history.
If you are trying to dissipate any great percentage of the energy from a 20 MW generator, you may be able to comfortably warm a small lake and add a vacation resort as a spin-off business. I boiled a lot of water doing a load test on a diesel set 1/1000 the size of your prospective generator. That was a 20 kilowatt set, compared to your 20 Megawatt set.
Bill
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"Why not the best?"
Jimmy Carter
RE: Generator dissipation resistance.
Regards
Marmite
RE: Generator dissipation resistance.
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If we learn from our mistakes I'm getting a great education!
RE: Generator dissipation resistance.
RE: Generator dissipation resistance.
Are you referring to CHP (combined heat and power) generation ?
RE: Generator dissipation resistance.
Our sister site is a fairly big gas processing plant and I'm not aware of any electrical generators in the conventional sense on that facility, although there is a turbo-expander or two.
Or is this just a big electric heater, a giant kettle element for want of a better description? Have you got an overview P&ID of the plant that you could upload?
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If we learn from our mistakes I'm getting a great education!
RE: Generator dissipation resistance.
On the other hand, the gas plant process requires heat to "cook" the gas and take out from it water, CO2, etc, through evaporation and controlled condensation.
In order to utilise some of the heat generated by the gas turbine, it is used a heat exchanger installed on the exhaust "pipe" of the gas turbine.
The heat exchanger transfers the heat from the exhaust gases to a heat transfer medium, which could be oil or water. In many gas plants I've seen oil used as transfer medium. But when big gas turbines are involved, usually the transfer medium is water which expands, becomes steam and it is used to drive a steam turbine, then part of the steam released by the steam turbine is used to heat the gas process.
So, recuperating the heat from the gas turbine, it improves the overall efficiency of the gas turbine and saves some gas being burned separately to generate heat required in the gas process.
Regards,
Stefan
RE: Generator dissipation resistance.
Now I am clearer about this issue. As additional information in a gas plant sister of my new project, the gas turbogenerators are used 50% in the oil heating for processing....this is a headache for the electrical operations plant, because they have to generate more power just to heat the oil...and the remaining power is just for export. But...operations personnel rule and they electrical personnel just obey.
RE: Generator dissipation resistance.