thermal plant and proposed CCGT efficiency?

holdfast

Hello

Looking for a bit of help here. I have a project which require me 2. Describe in detail one thermal/steam plant and calculate its efficiency, specific steam consumption and CO2 emissions. Compare this with a state-of-the-art combined cycle gas turbine system of similar size, again illustrating your answer with detailed calculations regarding efficiency and CO2 emissions?. I have the other parts of the project completed. But I am finding it hard to find such calculations. I have looked at the whitegate thermal plant and the proposed CCGT. Anyone have an idea

regards

mike

Capt'n Midnight

start on wikipedia and trace the references back
also look up carnot cycle for information on theoretical efficiencies, this gives you the maximum efficiency a plant could ever have based on the temperature of the steam. Nuclear plants loose a lot of efficiency because of the need to keep temperatures down in certain areas and losses in heat exchangers when keeping separate streams for radioactive coolant and steam for the turbines

other inefficiencies are in turbines and generators, but they are common to all


big problems are getting people to accept CHP in residential areas, the losses en route from the power station and what to do with the waste heat in summer and shortage of heat in wider , maybe a huge thermal mass underground ??

ircoha

holdfast wrote: »

Hello

Looking for a bit of help here. I have a project which require me 2. Describe in detail one thermal/steam plant and calculate its efficiency, specific steam consumption and CO2 emissions. Compare this with a state-of-the-art combined cycle gas turbine system of similar size, again illustrating your answer with detailed calculations regarding efficiency and CO2 emissions?. I have the other parts of the project completed. But I am finding it hard to find such calculations. I have looked at the whitegate thermal plant and the proposed CCGT. Anyone have an idea

regards

mike

I trust when u say whitegate u mean the following:

Aghada site comprises two separate parts divided by the main Midleton/Whitegate road and linked by a bridge. The in-filled site, where Unit 1 stands, was enlarged by excavating over half a million cubic meters of material from the hillside opposite, creating an arena in which the three combustion turbines (CT11, CT12, CT14) were situated. Unit 1 is a conventional steam turbine plant of 270MW capacity. CT11, CT12 and CT14 are three open cycle gas turbines, each with a capacity of approximately 90MW. Total station capacity is therefore 540MW.

There is some more tech data available on Moneypoint on the esb site
http://www.esb.ie/main/about_esb/power_stations.jsp#

and select technical data and then the smaller tech data below that:
there is a raft of info available, but as to what bits go into what formula to calculate efficiency well....

Re the new build: I dont think a proposed one will do as IMO the assignment needs an existing CCGT.

holdfast

Thanks for those. I guess I am a rock ape of a civil engineer. I need to see the calculation myself and monkey see, monkey do. I have a book on thermodynamics but still has me scratching my head.

re whitegate I decided on that one because it had the two systems in place. so now all my eggs are in one basket.

Anyone got a good reference book or website.

ircoha

Am told that http://www.amazon.co.uk/Engineering-Thermodynamics-Work-Transfer-S-I-Units/dp/0582045665/ref=sr_1_2/202-7598968-6487839?ie=UTF8&s=books&qid=1193694735&sr=1-2

has a set of formulaes that u can plug the numbers into but as already noted u need the actual numbers for the station in question: there's the rub:

from hamlet
Devoutly to be wish'd. To die, to sleep;
To sleep: perchance to dream: ay, there's the rub:
For in that sleep of death what dreams may come,
When we have shuffled off this mortal coil,
Must give us pause: there's the respect
That makes calamity of so long life

maniac101

holdfast wrote: »

Thanks for those. I guess I am a rock ape of a civil engineer. I need to see the calculation myself and monkey see, monkey do. I have a book on thermodynamics but still has me scratching my head.

re whitegate I decided on that one because it had the two systems in place. so now all my eggs are in one basket.

Anyone got a good reference book or website.

Have a closer look at that thermodynamics book, perhaps under "heat engine". Otherwise check out this wikipedia entry under the Efficiency bit for a basic explanation.

The thermal efficiency of a modern steam turbine is around 33%, sometimes a little higher. Around two thirds of the energy is rejected as heat.

A CCGT consists of two turbines and similar efficiency rules apply to each. The difference is that the rejected heat from the first (gas turbine) is reused to drive the second (steam turbine). This gives a total efficiency of 33% (for the first), plus 33% of the remaining 67% (for the second), if you know what I mean. This equates to around 56% thermal efficiency for CCGT.

More of an Engineering question than a "green issue" perhaps?