In order to ensure long term operation under high load of the unit,an on-line water flushing test of the air preheater has been carried out on the said boiler.

Aeration in the inverse direction of effluent was applied as the measure of online backwashing to control membrane pollution in the dynamic membrane bio-reactor treating sewage wastewater.

According to the unbalanced phenomenon due to the bonding in the operating of impeller of oxygen making centrifugal air-compressor,this paper has introduced the application of on-line water cleaning system for MSPS30-H05 type impeller in DH63-14 air-compressor,which provides the reference for solving the problem of vibration due to impeller bonding in oxygen making centrifugal compressor.