Abstract: The top cover of the traditional oven roof is made of cast iron which is solid，heavy and of high heat conductivity. It would cause overheating, heavy labor intensity，harsh ambient air and low heat recovery rate. To solve this problem，the HB type oven top cover has been adopted widely for a long time in large-capacity coke oven roofs. The results show that after application，the external temperature of oven roof drops more than 100 ℃. The direct economic benefits created for energy saving and consumption reduction of coking enterprises has reached millions of yuan annually. The fugitive gas has been effectively reduced so that the VOCs treatment has also become much easier. The quality of the coke on top of the coking chamber was improved. In addition，the ambient condition of the coke oven roof has been remarkably improved，which has bettered health and protection of workers. The comprehensive benefits of energy conservation，environmental protection and working efficiency were achieved

Key words: Coke oven, Top cover of coking chamber, Energy-saving technology, Ambient temperature, Carbon peak and carbon neutralization