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首页> 外文期刊>Thermal engineering >Influence of the Technique for Injection of Flue Gas and the Configuration of the Swirl Burner Throat on Combustion of Gaseous Fuel and Formation of Nitrogen Oxides in the Flame
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Influence of the Technique for Injection of Flue Gas and the Configuration of the Swirl Burner Throat on Combustion of Gaseous Fuel and Formation of Nitrogen Oxides in the Flame

机译：烟气喷射技术和旋流燃烧器喉道的形状对气体燃料燃烧和火焰中氮氧化物形成的影响

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摘要

How the points at which the flue gas was injected into the swirl burner and the design of the burner outlet influence the formation and development of the flame in the submerged space, as well as the formation of nitrogen oxides in the combustion products, have been studied. The object under numerical investigation is the flame of the GMVI combined (oil/gas) burner swirl burner fitted with a convergent, biconical, cylindrical, or divergent throat at the burner outlet with individual supply of the air and injection of the gaseous fuel through tubing. The burners of two designs were investigated; they differ by the absence or presence of an inlet for individual injection of the flue gas. A technique for numerical simulation of the flame based on the CFD methods widely used in research of this kind underlies the study. Based on the summarized results of the numerical simulation of the processes that occur in jet flows, the specific features of the aerodynamic pattern of the flame have been established. It is shown that the flame can be conventionally divided into several sections over its length in all investigations. The lengths of each of the sections, as well as the form of the fields of axial velocity, temperatures, concentrations of the fuel, oxygen, and carbon and nitrogen oxides, are different and determined by the design features of the burner, the flow rates of the agent, and the compositions of the latter in the burner ducts as well as the configuration of the burner throat and the temperature of the environment. To what degree the burner throat configuration and the techniques for injection of the flue gas at different ambient temperatures influence the formation of nitrogen oxides has been established. It is shown that the supply of the recirculation of flue gas into the fuel injection zone enables a considerable reduction in the formation of nitrogen oxides in the flame combustion products. It has been established that the locations of the zones of intensive fuel burnout and generation of nitrogen oxides do not coincide over the flame length, and the ambient temperature has a significant impact on the combustion stability at low values and on the concentration of nitrogen oxides in the combustion products at high values.
机译：已经研究了将烟气注入旋流燃烧器的位置以及燃烧器出口的设计如何影响浸没空间中火焰的形成和发展以及燃烧产物中氮氧化物的形成。 。数值研究的对象是GMVI组合式（油气）燃烧器涡流燃烧器的火焰，该燃烧器在燃烧器出口处装有会聚，双圆锥，圆柱形或发散的喉部，分别供应空气和通过管道喷射气态燃料。研究了两种设计的燃烧器；它们的区别在于没有烟气单独注入的入口。基于这种研究中广泛使用的CFD方法进行火焰数值模拟的技术奠定了基础。基于喷射流中发生的过程的数值模拟的总结结果，已建立了火焰的空气动力学模式的特定特征。结果表明，在所有研究中，火焰都可以按其长度常规分为几部分。每个部分的长度以及轴向速度，温度，燃料，氧气，碳和氮氧化物的浓度场的形式都不相同，并由燃烧器的设计特征，流量决定剂的成分，在燃烧器导管中的成分，燃烧器喉管的结构和环境温度。已经建立了燃烧器的喉管构造和在不同的环境温度下注入烟道气的技术在多大程度上影响氮氧化物的形成。已表明，将烟道气再循环到燃料喷射区中可以显着减少火焰燃烧产物中氮氧化物的形成。已经确定，燃料密集燃烧和氮氧化物生成区域的位置在整个火焰长度上并不重合，并且环境温度对低值时的燃烧稳定性和氮氧化物浓度均具有重大影响。高价值的燃烧产物。

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