The loading/unloading phenomena of the air compressor frequently appeared in compressed air system of 2×600 MW units in the fourth-phase project of Pingdingshan Yaomeng Power Generation Co Ltd

it is believed from analysis that the main causes are as follows:air compressor's outlet pressure fluctuation resulting from amount variation of used air for regeneration of the absorption dryer

and cartridge clogging in the precision air filter located at inlet of the said dryer.Through measures

such as removing non-return valve at outlet of the dryer

widening pressure range for loading/unloading the air compressor

and replacing the cartridge of precision air filter at inlet of the combined type dryer

etc.

the above-mentioned problem has been solved.