Controlling NOx emissions from the 460 kt/a ethylene plant's cracking furnace at Lanzhou Petrochemical,a typical high-temperature industrial facility,is crucial for achieving green production.This paper thoroughly analyzed the necessity of making technological retrofitting for the existing burner of the cracking furnace,made systematical investigation on the mechanisms of NOx formation during the ignition and heating processes,and proposed an optimized strategy based on alternating interval ignition and multi-factor integrated management.The results showed that measures such as transforming low-NOx burners,optimizing the ignition and heating process,introducing low-pressure steam in stages,and adjusting the damper opening effectively reduced the NOx emissions during the ignition and heating stages of the cracking furnace.These measures ensure compliance with NOx emission standards.Specifically,retrofitting low-NOx burners significantly reduces NOx emissions during normal operation.The application of the heat splitting principle,through alternating interval ignition and multi-step introduction of low-pressure steam,effectively minimizes transient high NOx emissions during the heating process.
关键词
乙烯装置/低氮燃烧器/点火升温优化/多因素综合管控/热量分割
Key words
ethylene plant/low-NOx burners/optimizing the ignition process/multi-factor integrated management/heat splitting
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