添加剂对焚烧飞灰旋风熔融特性的影响

采用旋风熔融炉对焚烧飞灰进行熔融试验，分析了CaO、SiO2、MgO等添加剂对熔渣熔融特性的影响。结果表明，CaO添加量在5%时可有效地控制飞灰熔点，熔渣中晶体相的比例较少，稳定性较好；添加SiO2有利于降低飞灰的熔点，随着SiO2添加量的增加，熔渣中玻璃态无定形物质增多，熔渣稳定性就越好；MgO对飞灰中硅酸盐或硅铝酸盐的网状结构有破坏作用，可降低熔融体黏度，MgO的添加可使熔渣中的玻璃态物质增多，晶体相转变为无定形熔渣，MgO添加量大于5%时，可促使试样达到较好的熔融效果。

Influence of additives on melting characteristics during swirling melting process of fly ashes from MSW incinerator

The fly ashes melting was teased in a self-developed swirling melting furnace system. The influences of calcium oxide, silicon dioxide, magnesia additives on the melting characteristics were studied during fly ashes melting process. When the amount of calcium oxide added is 5 percent, there is a effective control action on the melting point of fly ash. The amounts of crystals are lessened in the slag, and the stability of slag is enhanced. The melting-aid effect of calcium oxide can be appropriately adjusted based on the composition of fly ash. Adding silicon dioxide in the fly ash can redound to reducing the melting point of fly ash and promote the liquidity of sample. With the increasing of silicon dioxide added, the glassy amorphous materials in the melted sample are increased. The higher the adding amount of silicon dioxide, the better is the stability of melted slag. The netlike structures of silicates in the fly ash will be destroyed by adding the magnesia. The glutinosity of melted sample reduces with increasing the adding amount of magnesia. The glassy materials in the slag can be increased and the crystal phases transform can take place with adulterating magnesia. The crystals in the sample are enveloped by the amorphous slag. The sample would achieve the better melting effect when the adding amount is more than 5 percent in fly ash sample.