I have some question about inlet bleed heating control in GE Turbine.

First,command for air inlet bleed heating control valve come from IGV?

Scond one is that in my case doesn't give command ON from HMI.

Third, Is it comes to operation in determine percent of load?

finally, in very low temperature below 5C normaly should be comes to operation?

Thanks for your help.

 

You probably found this site using an Internet search engine.

This site has a 'Search' function, curiously hidden on the far right side of the banner at the top of the page. If you type:

+inlet +bleed +heat

into the search field box and then press 'Enter' on your keyboard, there will be a lot of matches very quickly returned.

One of them might help a lot:

http://www.control.com/thread/1260191943#1260479526

Read this with the knowledge that Inlet Bleed Heat (IBH) is basically the same for all GE-design heavy duty gas turbines.

On units equipped with DLN combustors, sometimes there is no ability to manually select IBH ON or OFF, as it's required for operation. We don't know if your unit has DLN combustors or not, so this is somewhat presumptuous.

Since IBH is usually used to protect the compressor when the IGVs are closed below what was previously considered to be the minimum operating angle, the signal for opening and modulating the IBH control valve is a function of IGV position.

To the extent that IGV position is related to load, IBH operation can roughly be related to load.

Lastly, IBH is a very poor name for what it's typically used for on DLN combustor-equipped units. IBH can be used, if necessary, in cold ambients, but if it comes into operation when the unit is at high loads, the power output will be reduced. Just because a unit has IBH (again, a very poor name for the functionality it provides) does not mean it will be used for anti-icing functions.

You would need to look at the sequencing or application code in your Speedtronic turbine control panel to see if the unit has the anti-icing control function.

If the unit has conventional combustors and IBH then it's likely it's for anti-icing protection. Usually there is some kind of ON/OFF capability for anti-icing control.

Use the search feature and you will likely see similar responses to similar questions about Frame 9Es. You can also search for +ibh for more results. Read the search results and the above and let us know if you have any other questions.