GT + water WHB

[Pederator]

Hi everyone,

do you know if it is possible to use waste heat from open cycle gas turbine in a recovery boiler, instead of steam producing water (probably for district heating, that is max 130 deg C at about 8 bar). The expected nominal power of the gas turbine is 22 MW, and heat recovered from flue gas to water 30 MW. Is this system possible to work properly? Do you know any reference plants where this configuration (GT + water WHB) is installed? Thank you in advance for help.

Regards, Pederator

 

[crshears]

Hello Pederator,

I can't swear as to the numbers you quote, but not only is this type of configuration possible, it has been done successfully almost too many times to count; search "Combined Heat and Power" on line.

CR

"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]

 

[EdStainless]

The thing that has to be watched is that if you add some restriction to the exhaust you will increase the temperature at the back end of the GT. The design of the exhaust, ducting, and heat recovery system have to all be done with respect tot he turbine limits.

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P.E. Metallurgy, Plymouth Tube

 

[cranky108]

It needs to be designed that way, or it becomes difficult later to add it.

 

[Pederator]

Thank you very much guys for help. From my updated information I know that this kind of configs are not common, but they do exist.

 

[jwkilgore]

Actually they are very common, at least in the USA. Almost all new non-renewable power plants being built today are "Combined Cycle" natural gas turbines. Gas is burned to run a turbine engine, then the waste heat is used to heat water for a steam generator.

Or are you talking about a different way to use the waste heat? You said "instead of steam producing water", so I may have misunderstood your question.