摘要
通过数值模拟对燃料射流环绕空气射流的五喷口高温空气燃烧的燃烧特性进行了研究。详细阐述了燃烧室内燃烧温度和燃烧组分的分布情况,并对NOx生成及其影响因素进行了分析。结果表明:燃烧室出口可燃物浓度低于0.1%,燃烧反应完全;燃烧反应主要发生在燃料射流包围的圆柱体内,沿射流方向,燃烧逐渐向空气射流方向扩大,燃烧过程缓慢,并在燃烧室后半段稳定燃烧;NOx主要在燃烧室的高温区域形成,降低燃烧室内高温区域的氧气浓度是抑制燃烧过程NOx生成的关键,在燃烧室入口附近,NOx的生成受燃料射流的入口温度影响较大。
In this paper, a burner with an air jet at the center surrounded by four fuel jets around applied to high temperature air combustion is studied by the numerical method. Comprehensive in-furnace predictions of temperature, gas composition （H2, CO, H2O, O2）; and NOx are carried out. The results show that concentrations of combustible materials at the furnace outlet are below 0.1% and the combustion is completed. The chemical reaction zone is limited to the volume of the hypothetical cylinder determined by the fuel jets and the flame is spread along furnace length direction. The combustion process is much slower compared with conventional burner techniques, and hydrogen and carbon monoxide are predicted far downstream into the furnace. NOx is formed in a thin elongated region （high temperature region） located between the fuel jet and the air jet. Reducing O2 concentration in the high temperature region is the key method to control the NOx formation. Due to the relative low temperature, the fuel jets have a great influence on the NOx formation in the front of the furnace.
出处
《能源研究与信息》
2008年第3期156-161,共6页
Energy Research and Information
关键词
工业炉
高温空气燃烧
数值模拟
industrial furnace
high temperature air combustion
numerical simulation
