Gas Turbine Load Reduction Causes

<....dust strom...heavy rain. After that...one gas turbine load reduced almost 2 MW...>

It looks as though the dust strom and the rain have tripped-off a connected load of almost 2MW, then. Someone, somewhere, isn't getting any 'juice'.

The remedy is to find out where the load has tripped, and reset the trip. For a load of that size, though, it is amazing that the telephone hasn't rung....

Unless, of course, the user wants the load switched off and hasn't advised, perhaps?

Whe you say the load reduced almost 2 MW, do you mean that it is only capable of producing 2 MW less than it did before?

If so I suggest that you look at your air filters. Dust + moisture = high delata P across your filters = lower power.

The answer lies in the question as a 7 millibar dP across the filter appears to be the prime reason for load drop since normal dP across standard filters is in the order of 3-4 millibar. If the filters have pulsing arrangement, keep the pulsing on manual for as long as possible to drop the dP across the filter. The filter make and specification also has an important role in dP across filters (i.e. if the media is 100% synthetic or is with Synthetic/Cellulose combination has a bearing on the levels of dP drop) and it is good to discuss with the filter manufacturers. If pulsing fails to improve dP, it is definitely time to replace the filters!! Best of luck.

Ashok

The pressure drop across the filters is high . You can check the trend . It needs pulsing or may be replacement. This can be confirmed by your filter supplier.

Few suggestions:

Inspect your filters, I'm assuming you have series of filters at the air intake house.

Compare the DP values before and after the dust storm and rain.

If the rate of increase of DP across the filters has shot up after the rain, change them accordingly.

Also compare your compressor discharge pressure values now and before the storm. This will show whether your offline compressor washing is due.

Do a performance check of your turbine, you must have a corrected output spreadsheet / software, where you can enter the DP across the filters, inlet air temperature and other parameters to get your corrected ISO output.

If your corrected ISO output has varied something has changed.

Hope this helps.