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Hello Guys,
We are facing an issue during our GT startup on liquid fuel (Low BTU gas so can not start on gas fuel). Want to clear few things before my question. We have GE frame 9E gas turbine with MARK VI controller.
Gas turbine is fired successfully every time but as the rpm increases i.e >2600 rpm then huge fluctuation in liquid fuel flow is observed. however AUTO Synch command is initiated as soon as turbine reaches 3000 rpm regardless of fuel hunting. This hunting is observed reducing after 25 MW and almost zero after 40 MW.
Actions Taken:
1. Liquid fuel Bypass Servo valve was replaced two months before and only first startup after replacement was hunting free.
2. Liquid fuel system venting/priming.
We can not understand the issue that why it is starting hunting reaching a specific rpm and load range. If there is a problem in servo valve then it must fluctuate whenever it is commanded. It is here to be informed that no LVDTs are installed at liquid fuel bypass valve rather flow divider magnetic pickups are used as feedback of the valve.
Our machine is now synchronized and on Gas fuel but we do not want to face this issue in future. I have received positive and beneficial comments from this forum before and hoping for the same once again.
If you require further information to help us then please let us know. I will visit the forum continuously and if anyone want to give answer me on my email id so it is provided below.
[email protected] is my email id
Thanks
We are facing an issue during our GT startup on liquid fuel (Low BTU gas so can not start on gas fuel). Want to clear few things before my question. We have GE frame 9E gas turbine with MARK VI controller.
Gas turbine is fired successfully every time but as the rpm increases i.e >2600 rpm then huge fluctuation in liquid fuel flow is observed. however AUTO Synch command is initiated as soon as turbine reaches 3000 rpm regardless of fuel hunting. This hunting is observed reducing after 25 MW and almost zero after 40 MW.
Actions Taken:
1. Liquid fuel Bypass Servo valve was replaced two months before and only first startup after replacement was hunting free.
2. Liquid fuel system venting/priming.
We can not understand the issue that why it is starting hunting reaching a specific rpm and load range. If there is a problem in servo valve then it must fluctuate whenever it is commanded. It is here to be informed that no LVDTs are installed at liquid fuel bypass valve rather flow divider magnetic pickups are used as feedback of the valve.
Our machine is now synchronized and on Gas fuel but we do not want to face this issue in future. I have received positive and beneficial comments from this forum before and hoping for the same once again.
If you require further information to help us then please let us know. I will visit the forum continuously and if anyone want to give answer me on my email id so it is provided below.
[email protected] is my email id
Thanks