大型乙烯裂解炉用低NOx燃烧器的结构优选
Structure Optimization of Low NOx Burners for Large Ethylene Cracking Furnaces
李宁 1李金科 2董金善3
作者信息
- 1. 南京工业大学机械与动力工程学院;天华化工机械及自动化研究设计院有限公司
- 2. 天华化工机械及自动化研究设计院有限公司
- 3. 南京工业大学机械与动力工程学院
- 折叠
摘要
随着大能力大型化裂解炉的不断发展,国内首台单炉膛20万吨/年产能乙烯裂解炉对燃烧器提出了更高的设计要求,在稳定燃烧的同时还要满足特定的工艺要求和严苛的环保要求.采用CFD技术和热态试验方法优选新型乙烯裂解炉用低NOx燃烧器,通过数值分析方法研究不同底部与侧壁供热比(底侧比)下裂解炉内的燃烧状态(火焰形状、火焰长度、炉内温度分布及NOx排放量等),结果表明:在底侧比为70∶30时燃烧状态最优,炉膛内温度分布均匀且满足工艺要求和环保要求.在热态试验炉上对最终设计工况(底侧比72:28)进行热态试验,结果显示:炉内燃烧状态良好,温度分布均匀且满足热通量曲线,NOx排放量也较低.
Abstract
With the continuous development of large-capacity and large-sized cracking furnaces,the higher requirements for the burner design of the first 200 kt/a ethylene cracking furnace with single furnace in China was proposed,including meeting specific process requirements and increasingly stringent environ-mental requirements while keeping stable combustion.In which,both CFD technology and hot test method were adopted to develop a new low NOx burner for the ethylene cracking furnace.Numerically analyzing the combustion state(flame shape and length,temperature distribution and NOx emission)within the cracking furnace at different bottom-side heating ratios(bottom-side ratio)shows that,the bottom-side ratio(70:30)is optimal and the temperature distribution there is uniform and it meets the requirements of technology and environmental protection;the final design conditions(72:28)implemented on the hot test furnace shows that,the combustion within the furnace is in good condition together with uniform temperature distribution,ideal heat flux curve and low NOx emission.
关键词
裂解炉/燃烧器/低NOx/数值分析/热态试验/底侧比Key words
cracking furnace/burner/low NOx/numerical analysis/hot state test/bottom-side ratio引用本文复制引用
出版年
2024
NETL
NSTL
万方数据