采用热天平和滴管炉对几种单一煤及混煤的着火、燃烧、燃尽特性进行了测定,初步分析了挥发分含量及混合比对混煤燃烧性能的影响;同时对混煤的灰渣形成特性和NO_x形成规律进行了研究.根据试验结果,用模糊数学方法进行综合评判,确定了最佳混合比,为大型电站锅炉混煤燃烧的安全、经济和清洁运行提供了科学依据. The ignition, combustion and burnout characteristics of several single coal and mixed coal were measured by thermobalance and dropper furnace. The influence of volatile content and mixing ratio on the combustion performance of mixed coal was analyzed preliminarily. At the same time, Formation characteristics and formation regularity of NO_x were studied.According to the test results, fuzzy mathematics was used to make a comprehensive evaluation to determine the best mixing ratio, which provided a scientific basis for the safety, economy and clean operation of the blended coal combustion of the large power station boiler.