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Coal Plant vs Combined Cycle Plant Auxilary distribution system
2

Coal Plant vs Combined Cycle Plant Auxilary distribution system

Coal Plant vs Combined Cycle Plant Auxilary distribution system

(OP)
I was looking at the auxilary distribution systems for both a coal generator plant, and a combined cycle generator plant and I noticed that the auxilary equipment required for combined cycle plant is signifigantly less than that used for a coal fired plant.

I was wondering if anyone could provide any information as to why the auxilary/support equipment required for a combined cycle plant is less thatn that required for a coal plant and therefore requires a smaller power distribution system. Does it have something to do with a combined cycle plant being more efficient than a coal unit?

RE: Coal Plant vs Combined Cycle Plant Auxilary distribution system

Ughhh,

Do you have any idea about how a medium to large size coal plant operates? Assuming equal output, there are large fans, FD, ID and PA, large pulverizer mills, clinker grinders, electric camper and valve actuators, electrostatic precipitators, and just lots more equipment than a CCGT plant utilizes. Even the water system in a CCGT plant represents only a small part of the plant output while the water/condensate system in a coal fired plant is for 100% of the cycle flow. There just isn't any comparison. Comared to a large coal unit, a CCGT has next to nothing when it comes to auxiliaries.

rmw

RE: Coal Plant vs Combined Cycle Plant Auxilary distribution system

Compare that to the distribution of a hydro plant.

The difference is that most of the auxiliries of a CCGT plant are mechinicaly served, not electricly served. Get real. The fans(for moving or compressing air) in a gas turban require much more power than the fans of coal plant. In fact in a gas turban that can be close to 50% of the power produced (general number, not exact).

Where is this going? Are you trying to prove something?

The difference is that in a coal plant the fuel is solid. In a CCGT the fuel is gas or atomized liquid. A CCGT is more efficent because it uses two cycles to produce power, but it lacks the ability to burn cheeper coal.

RE: Coal Plant vs Combined Cycle Plant Auxilary distribution system

Coal plant fuel supply = coal unloading, coal storage, conveyors, dust collectors, crushers, feed conveyors, FD fans, ID fans, boiler auxiliaries, sootblowers, baghouses, ESP's, ash handling, etc.

Gas plant fuel supply = pipeline with control valves.

No ash, minimal pollution contorl, no ESP, no fuel storage, minimal water use. Smaller area needed means fewer buildings, fewer lights, less maintenance facilities and equipment all making for a smaller distribution system.

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