关键词: 裂解炉 , 脱硝 , 选择性催化还原技术（SCR） 选择性非催化还原技术（SNCR） 低NO_x燃烧器

Abstract:

Taking cracking furnace as the research object, this paper analyzes three main technological schemes for reducing NO_x emission from cracking furnace based on the mechanism of NO_x formation by combustion. From the aspects of technology, economy, operation and maintenance and safety, a comprehensive comparison and analysis is made combined with a revamping project of cracking furnace burner recently implemented, and the commissioning and revamping effect of low NO_x burner is discussed.

Key words: cracking furnace；denitrification；SCR；SNCR；low NO_x , burner