动力配煤系统中配煤燃烧特性研究

STUDY ON COMBUSTION CHARACTERS OF BLENDED COAL IN COAL-BLENDING SYSTEM OF POWER INDUSTRY

在不同过量空气系数、炉膛温度和煤粉细度条件下,通过沉降炉燃烧特性试验,研究了不同煤种以不同比例混合配煤的着火、燃烧、结渣等燃烧特性变化规律及其影响因素。研究表明:(1)配煤中挥发分减少,着火温度逐渐升高,煤粉着火推迟,使得燃尽性变差;(2)配煤的发热量降低,导致着火温度逐渐升高及飞灰含碳量升高;(3)煤粉浓度一定时,煤粉越细越利于着火。

Under condition of different coefficient of excess air, temperature in furnace, and fineness of pulverized coal, etc. , through test of combustion chavacters in fallout furnace, the variating regularity of combustion characters, such as ignition, combustion,and slagging etc. , of blended coal obtained from blending different coal sort with different proportioning ratio, as well as their affecting factors have been studied. Study shows that：（1）the volatile matter content in the blended coal has decreased, the ignition temperature being gradually enhanced, the delayed ignition of pulverized coal making the burnup behavior to b.e worsened; （2）the calorific value of blended coal has lowered,leading to ignition temperature to be gradually enhanced,and the unburned combustibles in fly ash to be heightened; （3）the better fineness of pulverized coal is more helpful to ignition under certain concentration of the pulverized coal.