PowerSwitch Main Page
PowerSwitch
The UK's Peak Oil Discussion Forum & Community
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

CCGT load following?

 
Post new topic   Reply to topic    PowerSwitch Forum Index -> Hydrocarbons
View previous topic :: View next topic  
Author Message
DominicJ



Joined: 18 Nov 2008
Posts: 4387
Location: NW UK

PostPosted: Mon Jul 04, 2011 5:20 pm    Post subject: CCGT load following? Reply with quote

I had always assumed that the UK's load following plant was mostly CCGT.

But one of the big drawbacks of gas turbine engines in vehicles is that they have appaling partial load efficiencies.

Can anyone correct me?
_________________
I'm a realist, not a hippie
Back to top
View user's profile Send private message
An Inspector Calls
Banned


Joined: 27 Jan 2011
Posts: 961

PostPosted: Wed Jul 06, 2011 2:52 pm    Post subject: Reply with quote

The CCGTs are not used for load following.

Load following (and response) when provided by thermal plant means the generation unit has to operate at part load - this always reduces efficiency. But in the gas turbine section of a CCGT, part loading also has the effect of decreasing the maintenance interval quite severely.

So in the UK load following has traditionally been done by coal, oil (except we now do hardly any oil-fired generation) and PS. The hydro plant we have is not used for load following mainly because the governors are all so ancient they can't respond!

The efficiency of coal plant also drops when part loaded. Very roughly, a coal fired plant running at 60 % load will have an efficiency of 30 %.
Back to top
View user's profile Send private message
goslow



Joined: 26 Nov 2007
Posts: 705

PostPosted: Thu Jul 07, 2011 11:07 am    Post subject: Reply with quote

but, aren't they talking about new gas thermal stations to complement renewables?
Back to top
View user's profile Send private message
DominicJ



Joined: 18 Nov 2008
Posts: 4387
Location: NW UK

PostPosted: Thu Jul 07, 2011 11:44 am    Post subject: Reply with quote

Go Slow
That was what I thought, however, given what AIC said, presumably the new gas is for complete replacement of absent wind, and hydro/pumped storage will supplement present wind or gas?
_________________
I'm a realist, not a hippie
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    PowerSwitch Forum Index -> Hydrocarbons All times are GMT + 1 Hour
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group