中国能源建设集团科技发展有限公司，天津 300012
为了控制 Nox 排放，在 3 100 t/h 锅炉上进行了燃烧优化调整试验。通过调整二次风配风方式、主燃烧器上方的 OFA 风门开度、锅炉运行氧量、燃烧器与燃尽风摆角开度、燃尽风率和磨煤机的投运方式等因素，研究不同工况下炉膛出口 Nox 浓度及锅炉热效率变化规律。试验表明：不同的配风方式下，束腰配风工况的锅炉热效率最高，炉膛出口Nox 排放量最低。主燃烧器上方的 OFA 风门开度在 0% ~ 25% 之间变化时，炉膛出口 Nox浓度随着 OFA 风门开度的变大呈下降趋势；OFA 风门开度在 25% ~ 100% 之间变化时，炉膛出口 Nox 浓度随着 OFA 风门开度的变大呈上升趋势；而 OFA 风门开度在 0% ~ 100 %之间变化时，膛出口 CO 的浓度随着 OFA 风门开度的变大呈下降趋势。锅炉运行氧量变化对燃烧器区域火焰的平均温度影响较小，随着运行氧量的增加，锅炉热效率先升高后降低，而燃料型 Nox 的生成量是随着运行氧量的增加而急剧增加的。在实际运行中，燃烧器的摆角向下倾斜，燃尽风的摆角向上倾斜能够延长火焰中心，防止主燃烧区局部高温发生，可以有效的抑制热力型 Nox 的产生。在燃尽风率分别为 10%、15%、20% 和 25% 时，炉膛出口 CO 浓度和飞灰中的含碳量随着燃尽风率的升高而增加，炉膛出口 Nox 浓度和锅炉热效率则随着燃尽风份额的增加而降低。Department of Thermal Engineering,Northeastern University,Shenyang, Liaoning,China,Post Code:110000
In order to control NOx emissions,an adjustment test has been carried out on a 3 100 t/h boiler for the combustion optimization. By adjusting the secondary air distribution mode,OFA throttle opening degree at the top of the main burner,boiler oxygen,the swinging open angle of burner and burning wind,burning wind rate and the running way of the coal mill,the NOx concentration of the furnace outlet and the boiler thermal efficiency were studied under different working conditions. Test results showed that under different air distribution modes,the boiler thermal efficiency reaches the maximum and the NOx emission from the furnace exhaust is lowest under the waist air distribution condition. When the OFA damper opening fluctuates between 0%~25%,the NOx concentration in furnace outlet decreases as the OFA damper opening increases. When OFA damper opening varies between 25%~100%,the NOx concentration increases with OFA damper opening. With the change in OFA damper opening between 0%~100%,the chamber exhaust CO concentration decreases as the OFA inlet opening increases. Boiler oxygen variation has a small impact on the average flame temperature. With the increase of oxygen,boiler thermal efficiency increases first then decreases,while the fuel type NOx generation dramatically increases with oxygen. In actual operation,tilting down the pendulum angle of the burner,and sloping upward the burning wind swinging angle can extend the flame center,The Science and Technology Development Company of China’s Energy Construction Group,Tianjin,China,Post Code: 300012
preventing the high temperature of the main local combustion zone and effectively inhibiting the production of thermal NOx. When the burning wind rate is 10%,15%,20% and 25%,respectively,the CO concentration in the furnace outlet and the carbon content in fly ash increase with the burning wind rate,and the NOx concentration in the furnace outlet and boiler thermal efficiency decrease with the increase of the burning wind share.Electric Power Research Institute of Jilin Electric Power Co.,Ltd.,Changchun,Jilin,China,Post Code: 130000
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