大型裂解炉用底部燃烧器的国产化研发

针对大型裂解炉用底部燃烧器对火焰形状、火焰刚性、热通量分布和NOx排放的要求,利用燃料分级原理,结合喷嘴和配风方面的研究确定了燃烧器的结构型式;通过多方案流体动力学模拟计算对燃烧器的结构进行改进,同时通过热态试验验证了燃烧器的污染物排放、热通量分布等性能,最终开发出具有自主知识产权的大型裂解炉用底部燃烧器。在1 Mt/a乙烯装置裂解炉的工业应用结果表明,裂解炉内燃烧完全,火焰扁平刚直,运行55 d时管壁最高温度为1 044℃,NOx排放量为127mg/m3(标准状态),燃烧器的性能完全满足裂解炉的工艺要求及环保要求。

Research and Development of Ethylene Cracking Furnace Hearth Burner

Aiming at the request of ethylene cracking furnace hearth burner for the flame shape,the flame stability,the heat flux distribution and the NOx emission,by fuel classification method combined with research of the burner tips and the wind channel,the original structure of the hearth burner was determined.The burner structure was improved by computational fluid dynamics simulation,and the pollution emission and the heat flux distribution were validated through thermal state test.Then,the hearth burner of large-scale ethylene cracking furnace was developed successfully.Industrial application of the hearth burner indicated that the combustion was complete and the flame was flat and steady.The max wall temperature of the furnace tube was 1 044 ℃ after the furnace running 55 d and NOx emission was 127 mg/m3(standard state).