Insufficient output

over high discharged slag temperature and other problems occurred during operation of the roller slag cooler in a 300 MW unit CFB boiler. Thus

several countermeasures were put forward

such as removing the inner water cooling jacket of the roller slag cooler

changing the double-roller into the single-roller

and adding eight groups of water cooling tube rows in axial direction of the inner wall. After the above measures were taken

problems like the poor heat dissipation and block at inlet of the roller slag cooler

as well as the over high discharged slag temperature were basically solved. Therefore

the heat transfer efficiency of the slag cooler was enhanced and long-term stable operation of the roller slag cooler was ensured.