煤炭气化是煤炭洁净利用的重要途径,而气化炉又是煤气化过程中的关键设备。为了更好地适应多煤种尤其是高灰分高灰熔点煤,水冷壁气化炉技术的开发和应用是十分必要的。国外的Shell、Prenflo、Siemens等气化炉采用的都是水冷壁技术。气化炉水冷壁上熔渣的表面形态直接决定着气化炉能否持续稳定运行,但是目前国际上对熔渣的沉积过程、机理及其表面形态的研究都较少。
The test of slagging on water cooled wall was performed in a lab-scale entrained-flow gasifier.The gasifier's slag surface morphology at different temperatures was studied and analyzed quantitatively.The equivalent temperature(T)was proposed,which was the ratio of slag real temperature and ash fusion temperature.The slag surface roughness was obtained by using ImageJ image analysis software.The slag surface was smoother when T〉1.0 than that of T〈1.0.Using fractal theory,the geometric characteristics of slag surface were quantitatively shown by fractal dimensions,and the relationship between equivalent temperature and fractal dimensions was found.The results showed that the whole spread of molten slag particles required T be greater than 1.0 too.