Some Questions about Igniter of Gas Turbine

Hi,

I have worked before this type of gas turbubines make Mistubusi M701D model.For safety concrin of ignitor its move back after ignition.It done by Pneumatic clyinder with ignitor.Due to combustion chamber temp is more than 400deg c and combustion shell pressure is 20 Barg.

For igniotor resistance you use analog multimeter with high in put impendence.and disconnect field wires of igniotr than measure its resistence.

Hi,

Thank you for you reply. What I can understand now is that there's a cylinder built-in in the ignitor and it takes pressure from the combustion chamber and moves the ignitor off of the hot area. Please correct me if I am wrong.

Thank you.

Hi,

It is a single acting pneumatic clyinder with operating pressure 5 barg and movement control by Solenoid valve.Normally sov de energized amnd clyinder postion not in combustion chamber.when GT controllers give command during fuel opening time sov operate and clyinder moves in to combustion chamber and iginte 30 sec or 60 sec depending of GTG fire tuning.

There is no any connection of ignitor form combustion chambers except its mounted on chamber body.

Thank you so much for helping me out.

What I am confused about is, the one installed at the GT in our plant has no SOV connected to it, neither is there any tubing that could supply instrument air to the Single Acting Pneumatic Cylinder you told me about. It works just they way you told me, though. The Ignitors' Cylinder has no tubing but an Electric Supply for the spark plug.

What I can guess is that it's the pressure of the Gas in the Combustion Chamber that operates the Cylinder.

I hope you got what I am trying to say.