The problems existing in pneumatic ash conveying system of 300 MW boiler in Sichuan Baima CFB Demonstration Power Station Co Ltd are Pipe blockage

without reserve output capacity in front and rear electric fields

and frequent damage of valves etc..For these

corresponding retrofit measures

such as increasing the diameter of conveying pipe

changing the connection scheme of economizer with one electric field

and additionally installing n-shaped connection tube between the air-inlet valve and the non-return valve

as well as replacing the air-intaking valve and the air-bag type domed valve with ceramic double-sided gare valve

etc.

have been put forward.After retrofitting

the output capacity of said conveying system has been remarkably enhanced

the reliability of operation being subsantially increased

having good effectiveness.