新疆准东煤水煤浆气化细渣理化特性研究

Research on physicochemical property of fine slag of coal water slurry gasification with coal from Xinjiang Zhundong

为实现气化细渣的资源化、无害化、减量化综合利用,对新疆准东煤水煤浆气化细渣的化学组成、粒径分布、微观结构、孔隙结构、残碳分布、熔融特性、燃烧特性和气化反应活性等性质进行了研究。结果表明:气化细渣中固定碳质量分数为41.61%,不同粒径气化细渣中的固定碳含量随着颗粒粒径的增大而增加;气化细渣的d50粒径为126.84μm,比表面积为201.52 m^(2)/g,平均孔径为5.22 nm,孔容积为0.29 cm^(3)/g,具备制备吸附剂和活性炭的潜质;SEM结果表明:气化细渣主要由致密无定形态颗粒、球形颗粒和不规则多孔絮状物组成;气化细渣的着火温度和燃尽温度分别为511℃和691℃,明显高于原料煤,其综合燃烧特性弱于原料煤,可以通过添加反应性较好的原料煤改善气化细渣的燃烧性能。

In order to realize the resource and harmless utilization as well as reduction of the gasification fine slag,the chemical composition,particle size distribution,micro-morphology,pore structure,residual carbon distribution,fusibility,combustion characteristics and gasification reactivity of the fine slag of coal water slurry gasification with coal from Xinjiang Zhundong were analyzed.The results showed that the carbon mass fraction of the fine slag was 41.61%,and residual carbon increased with the increase of particle size in the fine slag.The median diameter(d50)of the fine slag was 126.84μm,the BET specific surface area was 201.52 m^(2)/g,the average pore size was 5.22 nm and the pore volume was 0.29 cm^(3)/g,which had the potential to be a raw material for activated carbon and adsorbent preparation.The SEM results showed that the fine slag was mainly composed of dense amorphous particles,spherical particles and irregular porous flocs.The initial combustion temperature and burnout temperature of the fine slag were 511℃and 691℃respectively,which were obviously higher than those of raw coal.However,the comprehensive combustion characteristics of the fine slag were lower than those of raw coal,and its combustion performance could be improved by adding raw coal of good reactivity.