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Jim Watts on Injecting steam in fuel gas line

By: Jim Watts [764] 5 Stars
Date: Wednesday, July 12, 2017
Time: 2:04:04 AM

Although there are practical reasons not to do so, the question is reasonable from a non technical person.
In the case of gas turbines steam injection is carried out and it increases the output so why not a boiler.
The steam cannot be injected into the fuel supply for safety reasons including loss of flame stability and resultant furnace explosions. Nor is injected into the fuel of a gas turbine for the same reason.
Steam could be injected into the combustion chamber as is done on a gas turbine.
So what would happen?
As the steam would enter the furnace as steam and leave with the boiler fluegas, the effect on the boiler depends on the temperature entering and leaving.
If it comes in hotter than it goes out the boiler output would increase and vice versa.

The boiler change is due to heat exchange but the gas turbine gets a larger change due to pressure drop and flow increase.





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Is Cp/Cv applicable to steam to calculate?
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