Abstract: Through conducting numerical simulation on the combustion and heat transfer process of the boiler, under the conditions of the different temperature the temperature distribution and volume fraction distribution of the pollutant in the combustion chamber were predicted. The results show that when the furnace temperature met the production requirement if the secondary and tertiary air is preheated to a high-temperature, the total amount of air and coal are both reduced. Meanwhile, the amount of the pollutants could be reduced to achieve the purpose of energy-saving and emissions-reduction. As the increasing air temperature, the furnace temperature at the same section is more uniformity, thus the water wall tube would be heated uniformly, which is helpful for water cycle stability in boiler.Therefore, combustion technology of high temperature and low oxygen could be used in the pulverized coal boiler. To reach high-temperature air, a solar air-heater should be installed on boilers tail to utilize solar energy to assist the flue gas waste heat to heat the secondary and tertiary air to 873 K above.

Key words: Pulverized coal boiler ,  High temperature and low oxygen combustion technology ,  Solar air heater ,  Energy conservation and emissions reduction

摘要： 　    通过对煤粉锅炉炉膛内的燃烧、传热过程进行数值计算研究，预测了不同空气温度下炉膛内的温度分布和污染物体积分数分布。结果表明，在达到工业生产要求的炉内温度时，二、三次风使用高温空气，可降低总空气量和煤粉消耗量，同时还可减少污染物的生成量，达到节能减排的目的；随着空气温度的升高，炉膛内同一截面的温度更加趋于均匀，这样水冷壁各管吸热均匀，有利于锅炉水循环的稳定性，有利于煤粉锅炉应用高温低氧燃烧技术。为了实现空气高温，可在锅炉尾部增设太阳能空气加热器，利用太阳能辅助烟气余热将二、三次风加热到８７３Ｋ以上。

关键词: 　煤粉锅炉 , 　高温低氧燃烧技术 , 　太阳能加热装置 , 　节能减排