基于CFD计算的管式加热炉燃气分级低NO_x燃烧器研究
发布时间：2018-07-16 23:33
【摘要】：以某石化公司低NO_x燃烧器改造项目中管式加热炉内0.7 MW扩散式燃气燃烧器为研究对象,提出了两种低NO_x改进方案。方案A采用传统燃料分级供给形式,方案B在采用燃料分级供给的同时还采用了特殊耐火砖结构。应用计算流体力学(CFD)软件Fluent对燃烧器两种改进方案的燃烧过程和NO排放进行了数值模拟,获得燃烧室内温度分布、组分分布、NO生成速率以及火焰形态等参数。比较计算结果发现,燃烧器方案B的结构能够合理地组织燃烧区的流场,改善火焰形态,提高火焰传热效率,防止局部热点的形成,使温度分布更均匀。与方案A相比,方案B的峰值温度降低了233K,出口处NO的平均体积分数降低了19.3μL/L,抑制NO排放的效果更好。
[Abstract]:Taking the 0.7 MW diffusive gas burner in the tube furnace of a petrochemical company as the research object, two improvement schemes of low no _ x are put forward. Scheme A adopts the traditional fuel staged supply form, while Plan B adopts the special refractory brick structure while using the fuel staged supply. The combustion process and no emission of two improved schemes were numerically simulated by CFD software fluent. The combustion chamber temperature distribution, composition distribution, no formation rate and flame morphology were obtained. The results show that the structure of the burner scheme B can reasonably organize the flow field in the combustion zone, improve the flame shape, improve the flame heat transfer efficiency, prevent the formation of local hot spots, and make the temperature distribution more uniform. Compared with scenario A, the peak temperature of scheme B was reduced by 233K, and the mean volume fraction of no at the outlet was reduced by 19.3 渭 L / L, so the inhibition effect of no emission was better.
【作者单位】： 北京航空航天大学航空科学与工程学院;
【基金】：中国石油化工股份有限公司天津分公司科技项目(31800000)资助
【分类号】：TE963
本文编号：2128048
[Abstract]:Taking the 0.7 MW diffusive gas burner in the tube furnace of a petrochemical company as the research object, two improvement schemes of low no _ x are put forward. Scheme A adopts the traditional fuel staged supply form, while Plan B adopts the special refractory brick structure while using the fuel staged supply. The combustion process and no emission of two improved schemes were numerically simulated by CFD software fluent. The combustion chamber temperature distribution, composition distribution, no formation rate and flame morphology were obtained. The results show that the structure of the burner scheme B can reasonably organize the flow field in the combustion zone, improve the flame shape, improve the flame heat transfer efficiency, prevent the formation of local hot spots, and make the temperature distribution more uniform. Compared with scenario A, the peak temperature of scheme B was reduced by 233K, and the mean volume fraction of no at the outlet was reduced by 19.3 渭 L / L, so the inhibition effect of no emission was better.
【作者单位】： 北京航空航天大学航空科学与工程学院;
【基金】：中国石油化工股份有限公司天津分公司科技项目(31800000)资助
【分类号】：TE963
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