Re: What can be expected from Combined-Cycle power stations


"Tim Keating" <NotForJunkEmail@xxxxxxxxxxxxxxxxxxxxx> wrote in message
news:l9mej1tfsi3gf4gn1662pvihlshj0ifbfd@xxxxxxxxxx
> On Sun, 25 Sep 2005 22:39:00 GMT, "daestrom"
> <daestrom@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
>>
>>"Baby Elian" <xxx@xxxxxxxxxxx> wrote in message
>>news:r7CZe.18239$pJ6.1237670@xxxxxxxxxxxxxxx
>>>
>>> <hans.dekeulenaer@xxxxxxxxxxx> ha scritto nel messaggio
>>> news:1127667503.426750.157120@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>>>> With this 3rd story in the cycle, SEAL (Sustainable Energy for All)
>>>> completed its fossil fuel campaign. Combined-Cycle, i.e. Steam and Gas
>>>> power plants can achieve efficiencies up to 60%.
>>>> http://www.sealnet.org/s/10.pdf
>>>
>>> I don't think thermal efficiencies are important with gas prices at
>>> 12-15
>>> $/MBtu....
>>
>>With the high cost of NG, thermal efficiencies are paramount. NG combined
>>cycle plants, with their very low capital costs, very low O&M costs, have
>>only one drawback, their high fuel costs. And high thermal efficiency
>>helps
>>to curb that.
>>
>>Their short construction schedule makes them attractive from the risk
>>point
>>of view. It is easier to predict economics out for just five to ten years
>
> You're confusing gas turbine only plants..
> with the much more expensive combined cycle plants.
> (turbines + steam boilers & steam turbines)..
>
> The latter requires a considerable heat sink..
> (I.E. Large conderser/cooling infrastructure, Which takes
> significant resources and approvals to build. )
>

No, actually we have just such a combined cycle plant not far from here.
http://www.metsoautomation.com/automation/index.nsf/FR?ReadForm&ATL=/automation/ep_prod.nsf/WebWID/WTB-041110-2256F-EA84F
Yes, it uses the gas turbine exhaust to heat steam boilers, that in turn
drive steam turbine generators. It has two forced-draft cooling towers and
uses a lot of municiple water for makeup.

Took 23 months to build, about $800M and employs 50 people including the
receptionist and payroll clerk. When running at full power (rarely) it gets
about 54% thermal efficiency. But it usually runs at low load and collects
fees for being able to put >750 MW on the grid in < 15 minutes when called
upon.

By today's standards, this one is old and has already paid for itself

Heritage station is newer and uses even higher thermal efficiencies.

daestrom


.

Relevant Pages