灰中酸性成分对灰熔融温度的影响

搜集并统计了世界129种典型煤种、城市污水污泥及污泥/煤混烧灰样的灰成分及灰熔融特征温度等相关数据,研究灰中酸性成分SiO2、Al2O3、TiO2和P2O5对灰熔融特性的影响。结果表明,Al2O3是决定灰熔点的主要因素,酸性金属氧化物SiO2、Al2O3和TiO2形成的耐熔矿物质石英、偏高岭石、莫来石、金红石等可提高灰熔点。非金属氧化物P2O5与污泥和污泥/煤的灰熔点FT二次拟合很好且明显降低熔点,污泥灰中P2O5含量显著高于煤灰是导致其熔点明显低于煤的重要原因。

Effect of acidic compositions on ash fusion temperatures

Ash fusion characteristic parameters of 129 typical original ash samples were collected locally and abroad, which included coals, sewage sludge and blends of sewage sludge/coal. These data were used to study the effect of acidic oxides including SiO₂, Al₂O₃, TiO₂ and P₂O₅ on ash fusion temperatures (AFTs). The refractory minerals such as quartz, metakaolin, mullite and rutile formed by SiO₂, Al₂O₃ and TiO₂ improve the AFTs. The results show that Al₂O₃ is a main factor in determining AFTs. Furthermore, the non-metal oxides P₂O₅ has a significant correlation with the FT of sewage sludge and sewage sludge/coal blends and its increase can obviously reduce AFTs, which might be caused by the higher P₂O₅ content in sewage sludge.