大型电站粉煤灰灰度影响因素分析

Factors affecting gray scale of fly ash in large scale power plant

粉煤灰作为大型电站的副产品,通过多年的综合开发利用,已成为混凝土的重要原材料。然而,当粉煤灰颜色变深,成分有所变化时,其品质会有所下降,进而影响粉煤灰的销售。对此,本文通过获取粉煤灰灰度值的方法,对其颜色进行量化,并对相关影响因素进行了试验研究。结果表明,影响粉煤灰灰度的因素有粉煤灰含碳量、粒径大小、化学成分及炉内还原性气氛,通过适当提高运行氧量及减小两侧氧量偏差可预防粉煤灰颜色加深。该结果对采用低NOx燃烧技术的对冲燃烧机组有一定指导意义。

As a by-product of large scale power plant,fly ash has become an important raw material of con crete through comprehensive exploitation and utilization for many years. However, fly ash composition changes when its color get darker. Its quality will decrease, which affects the sale of fly ash. In order to solve the existing problems, by means of analyzing the gray scale of fly ash, this paper quantified its color and studied the related influence factors. The results show that, carbon content, particle size, chemical com- position and reducing atmosphere in the furnace are the factors affecting gray scale of the coal ash. Properly increasing the oxygen content and decreasing the oxygen deviation of both sides are effective means of operation adjustment to prevent the fly ash color from getting darker. In terms of opposed firing boiler applying low NOx combustion technology,research on gray scale of fly ash is of certain reference and guidance significance.