煤粉锅炉高温空气燃烧研究  

Research on High-Temperature Air Combustion of Pulverized Coal Boiler

作　　者：王春华[1] 贾冯睿[1] 潘颢丹[1] 张洪恩 

机构地区：[1]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113001 [2]沈阳景盛消防工程有限公司,辽宁沈阳110013

出　　处：《工业炉》2014年第1期17-20,24,共5页Industrial Furnace

基　　金：国家科技支撑计划课题(2006BAB12B04)

摘　　要：对125 MW四角切向燃烧煤粉锅炉炉膛内的燃烧、传热过程进行研究,预测了不同空气温度下炉膛内的流场分布、温度分布和气相浓度分布。结果表明:各种工况下,炉内高温区出现在燃烧器区域,随着炉膛高度的增加,温度逐渐降低;相比低温区,高温区内的CO浓度较高,CO2和O2浓度较低;从各燃烧器喷口出来的气流围绕一个切圆运动,切圆直径内和贴近炉墙的气流速度都较低,其他区域气流速度较高;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,可以降低总空气量和煤粉消耗量,同时还可以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。The process of the combustion and heat transfer in the boiler body of 125 MW tangentially fired pulverized coal boiler is studied, and the flow field, temperature field and gas phase concentration distributions under different air temperature are predicted. The results show that, in every condition, the high-temperature region appears in the area where burners installed, and with the increase of furnace height, the temperature is gradually reduced. Compared with the low-temperature region, the concentration of CO is higher and the concentration of CO2 and 02 are both lower in the high-temperature region. The gas squirting from the burners flows around a tangent circle, the air velocity in the tangential diameter and close to the furnace wall is lower, conversely, in other regions. When the furnace temperature meets the industrial production requirement, the secondary air and the tertiary air using high temperature air, it could reduce the total amount of air and pulverized coal consumption, and also reduce the generation of pollutants and achieve the purpose of energy conservation and emissions reduction. With the increase of air temperature, the furnace temperature at the same section changes more even, so the water wall tube will be heated uniform, which is helpful for water cycle stability in boiler.

关 键 词：煤粉 切向燃烧锅炉 高温空气 数值模拟 节能减排 

分 类 号：TK221[动力工程及工程热物理—动力机械及工程]