摘要
采用了浮选法从循环流化床锅炉飞灰中提取残碳,在德国NETZSCH公司的STA 409型热分析仪上研究了原煤与飞灰残碳的燃烧特性的差别,并研究了两种飞灰残碳在不同氧浓度下的燃烧行为.实验结果表明:飞灰残碳的反应性温度以及着火温度较原煤高,残碳的反应活性并不仅仅依赖其入炉煤,还与电厂的具体燃烧工况有关.随着氧浓度增大,飞灰残碳的着火温度呈下降趋势,着火时间提前,飞灰残碳的综合燃烧特性指数提高;当氧浓度小于40%时,飞灰残碳燃烧特性改变较大,当氧浓度大于40%时,改善趋势变缓.因此采用膜法富氧燃烧时,宜采用的氧浓度为40%左右.
The residual carbon involved was extracted from Kaifeng（440 t/h）, and Fenyi （410 t/h） CFB boiler fly ash by floating. The combustion characteristic of two residual carbons and the original coal particles was analyzed using thermal analysis （TGA,STA409C, Netzsch, Germany）. It was observed that the ignition temperature of the residual carbon is much higher than that of original coal sample. The combustion property of residual carbon reaction is not only dependent on original coal property, it also relates to the operating condition. Simultaneously it was found that higher oxygen content is favor for the upgrading of combustion behavior of residual carbon, and oxygen-rich combustion of residual carbon can lower ignition temperature, accelerate the combustion rate. It can be derived that oxygen concentration of 40% is the optimal chose to improve combustion characteristics residual carbon best.
出处
《煤炭转化》
CAS
CSCD
北大核心
2008年第1期61-65,共5页
Coal Conversion
基金
国家自然科学基金资助项目(50721005).
关键词
循环流化床
飞灰
残碳
TGA
燃烧特性
CFB boiler,fly ash, residual carbon, TGA, combustion characteristic
