Directing against the problems existing in air cowls

such as abrasion and slag leakage

on the air-distributing plate in CFB boilers

through additionally installing throttle ring at entrance of the air cowls

decreasing the number of air cowls

and modifying the structure of air cowls etc.

it is known from cold-state test and calculation that the above-mentioned problems have been basically solved.After retrofitting

the pressure drop of air-distributing plate has been somewhat increased

the structure of air cowls being more reasonable

laying a good foundation for long-term economic operation of the unit.