How can I reduce the acceleration time and increase the rate of FSR in turbine ms9001e? What is the best value of acceleration time and FSR for normal operations?

 

Reducing the acceleration comes at a cost--to the hot gas path parts life. The air flow through the axial compressor as the unit accelerates is very low until it nears rated speed (which is one reason why you see exhaust temperatures reach a peak during acceleration, then drop dramatically as the unit reaches FSNL; granted, the IGVs open to minimum operating angle at about 80% speed and the compressor bleed valves close at 95% speed, but if you plot CPD versus speed, you will also see that it doesn't start increasing until the unit is around 90% speed or so--that's one of those characteristics of axial compressors). The low air flow means there's not much cooling during acceleration.

You can "pour the coal" to the unit to make it accelerate faster, but you're going to be replacing more hot gas path parts sooner than anticipated.

If you think the unit is accelerating too slowly, you should take to your turbine packager or the OEM and describe your issues.

There were differences in the start-up/acceleration schedules depending on the vintage of Speedtronic turbine control system. What control system do you have on your turbine?

Some early vintage Mark IVs did a poor job of controlling acceleration (actually, they didn't...). Later versions were better. It wasn't until the Mark V came out that an acceleration reference was used during acceleration and fuel was actually adjusted to make the actual acceleration match the acceleration reference. Mark VIs continued with this scheme.

GE makes recommendations on parts life and maintenance factors in GER-3620. They talk about different acceleration rates and loading rates and how they affect maintenance and outage planning.

*Generally*, it takes a properly tuned GE-design heavy-duty gas turbine *approximately* 15 minutes after flame is established to reach FSNL. That's a very general statement; some units take about 12 minutes; some about 17 minutes. But that should give you an idea of what's typical.