Gas turbine inlet guide vane, How IGV works part 2, igv tutorial, power plant guru

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[@syed_taha_ahmed]

IGV temperature control works on Exhaust temperature CPD biased control? As per my understanding due to any reason when cpd increases it increase air flow to combustor with (igvs fully open ) this will decrease combustion temperatures hence ttrf will decrease and ultimately ttxm will decrease. As TTRF falls below ttxm at new CPD value the fuel flow will increases to maintain constant firing temperature.
But with data trend the ttrf wouldn't come to its original value as cpd increases or decreases with change in ttxm.

[@varunsampath8351]

Hi sir, your lecture is good. I have some doubts,
For combined cycle power plant with HRSG, if you want to maintain exhaust temperature the same with partial load also, then
My doubts are
1) First to decrease load, you would decrease fuel flow. Now, if you decrease fuel flow, turbine inlet temperature would change na? So, in operation do they always keep turbine inlet temperature same irrespective of loads, or they can change turbine inlet temperature or not?
2) If you want to maintain same turbine inlet temperature, then we have to increase or decrease the airflow?
3) Why at partial loads(loads less than base load), exahust temperature is said to increase? Why?

[@powerplantguru007]

The question are good we can connect in our live session

[@eliyaskhan8008]

Please make video.. if possible of Gas turbine different frame with generation capacity..

[@syed_taha_ahmed]

Have you posted any video on trip oil system employed in GE designs.
What i understand during normal operation trip oil flows to solenoid valve and 20 TV, Gas fuel stop valve and Liq fuel stop valve.
When command is initiated the solenoid valve make it flow to drain thus droping the pressure of trip oil header which further close the igvs and fuel valves but
But igvs are actuated by hydraulic pil so how trip oil trips them.

[@powerplantguru007]

Let's discuss this in a doubt clearing session.

[@syed_taha_ahmed]

​@@powerplantguru007
How to participate in that?
Thanks a lot

[@powerplantguru007]

Please join our membership to have questions and answer sessions.

[@syed_taha_ahmed]

What is IGV temperature control slider?
Secondly how cpr relates with exhaust temperature?
If CPD is high then CTD is high and CPR is high?

[@powerplantguru007]

Hello Syed. Thanks for watching my videos. I regret the delay in responding to your queries to time constraints. Please refer below reply to your questions (one answer for different comments)
TTRX is a calculated value that uses some array values and the CPR (Compressor Pressure Ratio) or CPD (Compressor Pressure-Discharge) value to arrive at TTRX--which is the absolute maximum allowable turbine exhaust temperature for any given operating condition. When the unit is operating at Base Load, TTRX is used to determine FSRT, and it is the lowest FSR input value to the MIN SEL block. When operating at Base Load the turbine control is being told to put as much fuel as possible into the unit while still protecting the hot gas path parts and the exhaust diffuser to produce as much torque as possible to produce as much electrical power as possible. And the exhaust temperature reference, TTRX, becomes the limit for the amount of fuel being admitted to the turbine. The Mark* compares TTXM (Turbine Temperature-Exhaust, Median (actually it's an average exhaust temperature)) and TTRX and controls the amount of fuel to make TTXM equal to TTRX.
During part-load operation when the IGVs are being used for either IGV Exhaust Temperature Control OR for DLN combustor air control the IGVs are closed to maximize exhaust temperature--up to TTRX. Maximizing exhaust temperature for units which exhaust into a HRSG (Heat Recovery Steam Generator; a "boiler") maximizes steam production at Part Load conditions which increases the overall plant thermal efficiency (a lower plant heat rate). TTRX sets the limit on exhaust temperature--so TTRX is used to derive the maximum amount the IGVs can be closed during part load operation to prevent TTXM from exceeding TTRX.
When the turbine has DLN combustors the IGVs are used to control the amount of air flowing into the combustors--BUT, that's NOT done by measuring air flow. GE knows, from decades of operating data and experimentation, how much air is flowing for given IGV angles. And, what they do is they modulate the IGVs to control air flow to maintain flame stability--and they do that by keeping the IGVs closed as much as possible. And the effect of closing the IGVs is to maximize exhaust temperature--but TTRX sets the maximum limit on exhaust temperature. So, TTRX is used to derive the IGV angle at Part Load, just like during IGV Exhaust Temperature Control.
(By the way, keeping the IGVs closed as much as possible during Part Load operation decreases turbine thermal efficiency (increases the turbine heat rate)--but if the unit exhausts into an HRSG that's good for the overall plant heat rate and steam production. And for units with DLN combustors, it's absolutely necessary to maintain flame stability.)
Please ask in case of further queries.

[@syed_taha_ahmed]

​​@@powerplantguru007Thanks a lot to your detailed reply.
Please Accept my apologies, my notifications are idk why turned off I've not seen any notification. Thanks a lot Sir for your valuable time

[@syed_taha_ahmed]

At part load IGV control mode ihs on oor off?
At base. load igv os 86 degrees and exhaust temperature is 630 celcius
at part load igv is 53 degree and exhaust temperature is 640-645 celcius

[@powerplantguru007]

Hello Sayed, thank you for watching my videos.
Is this a GE machine?

[@syed_taha_ahmed]

@@powerplantguru007 Yes.

[@syed_taha_ahmed]

​@@powerplantguru007Yes Frame 6f

[@gauravkapoor2489]

Sir your explanation is too good and your speaking with too much patience is highly appreciated....... I don't have to reduce speed of your video

[@powerplantguru007]

Thanks Gaurav

[@ameychivelkar2834]

Good explained. Please explain the water chemistry in drum

[@powerplantguru007]

Thank you Amey for your support!

[@mahmoudmoqbal7239]

I have one dobt about steam turbine during start up which is first gland steam or vacum to be creat.

[@powerplantguru007]

Hello
Gland steam charging is to be done earlier

[@mahmoudmoqbal7239]

@@powerplantguru007 thank you sory for that can you tell me why we have creat first

[@pravindubey3502]

Sir , please it's video make Hindi as per possible.

[@powerplantguru007]

Hi pravin
Sure, I will try to make it in Hindi.
I was also a Hindi medium student in school. 🙂

[@meetpanchal286]

Great job 👏

[@jagdishlad7077]

Thanks.

[@AbhishekKumar-xu9ds]

Nice informative video

[@powerplantguru007]

Thank you for watching my videos

[@eliyaskhan8008]

Good Job...👍👌

[@powerplantguru007]

Thank you so much 😀

[@ocean8138]

Thanks

[@powerplantguru007]

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