摘要
通过数值模拟研究了在一维燃烧炉上燃用低挥发分煤的条件下,空气深度分级和煤粉细度变化对煤粉燃尽过程和NOx排放的影响,得到了沿炉膛轴线方向上的温度、氧浓度和NOx的分布,表明空气深度分级后燃烧后期的氧量增加,炉膛温度水平提高,而煤粉细度的提高使得上述效果更加明显,因而燃烧效率提高和NOx排放降低,并通过实际燃烧试验验证了数值模拟结果。研究结果表明,对燃用低挥发分煤,采用空气深度分级技术和提高煤粉细度的措施,可以同时取得高效低NOx排放的效果。
Through a numerical simulation,studied was the influence of the deep air-staged version and change of pulverized coal fineness on the pulverized coal burn-out process and the NOx emissions under the condition of burning low-volatile coals in an one-dimensional combustion furnace.The distribution of temperature,oxygen concentration and NOx along the furnace axial direction was obtained.The simulation results show that with the deep air-staged version,the oxygen amount will increase at a later stage of combustion,and the furnace temperature level will go up.Moreover,the enhancement of the pulverized coal fineness will make the above effect more conspicuous,thus improving combustion efficiency and reducing NOx emissions.The numerical simulation results have been verified by actual combustion tests.It has been found that when burning low-volatile coals,the adoption of such measures as the deep air-staged technology and the increase of pulverized coal fineness can result in both efficiency enhancement and reduction of NOx emissions.
出处
《热能动力工程》
CAS
CSCD
北大核心
2009年第6期777-781,共5页
Journal of Engineering for Thermal Energy and Power
基金
国家863专项基金资助项目(2006AA05Z301)
国家自然科学基金资助项目(50721005)
关键词
低挥发分煤
深度分级燃烧
煤粉细度
高效率
低NOX排放
空气分级燃烧
low-volatile coal,deep air staged combustion,pulverized coal fineness,high efficiency,low NOx emissions,air-staged combustion
