流化床燃煤固硫灰渣水硬性机理研究

经固硫的流化床燃煤灰渣有明显的早期水硬性,甚至可在与水混合几小时后即凝结硬化,而未经固硫的灰渣则不明显。本文采用X射线衍射、红外光谱和化学方法对固硫灰渣早期水硬性机理进行研究,结果表明:固硫灰渣基本不含水泥熟料成分,矿物主要以无定形态存在;固硫灰渣中SiO4]及AlO6]的聚合程度均低于未经固硫的流化床灰渣及粉煤灰;进一步的化学测定结果证实,固硫灰渣早期水硬性主要来源于一定数量水化性能较快的无定形矿物组分。

Experimental Study on Hydraulic Mechanism of FBC Desulphurization Ashes

Fluidized bed combustion (FBC) desulphurization ashes have the hydraulic property at earlier age, but those without desulphurization not. The self-cementing rate is fast even within several hours after being mixed with water. The mechanism of hydraulic property was investigated by X-ray diffraction (XRD), infrared (IR) spectroscopy and chemical method. The results show that FBC desulphurization ashes contain no cement clinker, and the amorphous components are predominant. The polymerization degree of SiO4] and AlO6] of FBC desulphurization ashes is lower than that of those FBC ashes without desulphurization and pulverized coal combustion (PC) ashes. The contents of the components with fast hydration rate of the former are significantly higher than those of the latter. This work confirms that the amorphous minerals with high chemical activity are the main sources of the hydraulic property of FBC desulphurization ashes at earlier age.