Realizing ultra‐low NO_x emissions during coal combustion is currently a development trend and technical bottleneck of coal combustion technology. To further exploit the low‐nitrogen potentialities in preheating combustion technology, the preheating characteristics, combustion characteristics, and NO_x emission characteristics of pulverized coal, after changing operating parameters such as the air equivalence ratio of circulating fluidized bed, preheating temperature, combustion temperature, and air equivalence ratio in the reduction zone, are explored. The experimental results show that changing the operating parameters has a great impact on the composition of high‐temperature coal gas, the particle size, apparent morphology, and specific surface area of the high‐temperature preheated char after preheating. Properly adjusting the operating parameters can effectively reduce NO_x emissions. Based on the explored principle, experiments were designed, and the goal of reducing the initial NO_x emissions from coal combustion to less than 50 mg/m³ (the average emissions were 46 mg/m³ [@ 6% O₂]) was successfully achieved. The research of this paper provides the most basic experimental guidance and theoretical support for achieving ultra‐low NO_x emissions during the engineering pulverized coal combustion.

中文翻译：

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煤粉预热燃烧超低NOx排放的实验研究

实现超低NO _X煤燃烧过程中排放是目前的发展趋势和煤燃烧技术的技术瓶颈。为了进一步利用预热燃烧技术中的低氮潜力，预热特性，燃烧特性和NO _x在改变循环流化床的空气当量比，预热温度，燃烧温度和还原区的空气当量比等运行参数后，研究了煤粉的排放特性。实验结果表明，改变运行参数对高温预热后高温高温焦炭的组成，粒度，表观形态和比表面积有很大影响。适当地调整操作参数可以有效地降低NO _X排放。根据探索的原理，进行了实验设计，目标是将燃煤的初始NO _x排放量降低至50 mg / m ^3以下（平均排放量为46 mg / m ³ [@ 6％O ₂ ]）已成功实现。本文的研究提供了实现超低NO最基本的实验指导和理论支持_X工程煤粉燃烧过程中排放。