Hello Dear
I hope you’re doing well,
In our gas turbine 9E / auxiliary compartment become very dirty due to the dust of the pulsation system , what is best way to minimize the dust of the pulsation system please??

 

If there are any fuel system component(s) in the Accessory Compartment the primary purpose of the ventilation fan is to reduce any combustible gases which might result from fuel leaks. But if there aren’t any fuel system component(s) in the Accessory Compartment then the primary purpose of the vent fan is compartment “cooling.” (L.O. vapors can be explosive too, though…! And the Accessory Compartment is directly above the L.O. reservoir.)

How is the air supplied to the Accessory Compartment? Does the Accessory Compartment ventilation fan take ambient air through its suction and blow it into the Access. Compartment? (In this case the Accessory Compartment would be under a positive pressure.) Or does the Accessory Compartment ventilation fan draw air into the Access. Compartment through gravity-operated dampers in the Access. Compartment doors? (In this case the Accessory Compartment would be under a negative pressure.)

If it’s the former design and build a suitably-sized air duct (using the air flow rate from the fan nameplate) to draw air from a cleaner area—though if there’s that much dust you should seriously consider some kind of filter (as suggested below) and/or cyclone separator at the inlet (suction) of the ventilation fan air duct, too.

If it’s the latter then you are going to need some kind of washable filter element (that can be quickly changed out to be cleaned and dried and re-used later) BUT that doesn’t restrict the air flow too much. The filter won’t be very large (unless it’s on the inside of the Accessory Compartment door) and it may have to be changed and cleaned often. But if the filter holder is designed properly and quickly changed when dirty and quickly cleaned and dried it might not be too much trouble—certainly much less trouble than cleaning the Accessory Compartment.

Remember—once the machine is out of warranty it belongs to the purchaser and as such modifications can be made to overcome issues or site conditions that need mitigation. I would suggest installing several temperature sensors (could be thermocouples or RTDs) prior to any modification to the air source and/or filter to get some baseline data about the normal temperatures in the compartment over a good period of time (during the hottest time of the year would be good). Record the data and plot it to use after whatever modification(s) are made to check that the compartment is still being properly “cooled” and ventilated (compartment temperature is indicative of proper ventilation).

Please let us know how you proceed (what is decided). And how it works. These posts are read and followed by a LOT of people and this issue is probably experienced by a lot of sites.

 

There are some types of inlet filter houses that have the filters arranged in a vertical plane and when the filters are blown down (either manually or automatically) the presumption is that the dust will fall into a U-shaped trough at the bottom of the filters where an auger moves the dust/dirt to one end of the trough where it can go into some kind of container and be hauled away to be emptied.

In practice, the dirt from upper filters falls into the folds of lower filters--even if the blowing starts from the top row of filtersand continues down to the bottom row. The dust/dirt builds up in the folds of the filters (or the removable/replaceable socks placed over the outside of the filters (a sort of "pre-filter") and just doesn't get fully dislodged over time.

That's why in many dusty/dirty locations the filter houses are built with the filters arranged in a horizontal plane, which works better (the filters seem to last a little longer, BUT the dust/dirt has to go on the ground or the top of the Accessory Compartment when it's blown off, and honestly, it sometimes gets sucked back into the filters which have been blown "clean."

What I'm trying to say is I have never seen a good, working filter arrangement for dusty/dirty areas that allows for the blowing off of dirty (with the 'self-cleaning' system of pulsing (blowing)) that is effective at capturing the dust/dirt and preventing it from being reingested or, as in your case, being blown or drawn into the Accessory Compartment or even the Turbine- and Load Compartments to some extent. Or even ingested in the 'self-cleaning' generator air filters to an even slightly lesser degree.