基于高压水射流的超细煤粉制备技术及其影响因素研究

摘要

High-pressure waterjet technology use cavitating jet mill equipment to crush dif-ferent particle size coal simples.Crushing effects of different particle size coal simples in different jet pressure have been studied from three aspects,including particle size distribution,specific sur-face area and morphological properties.The experimental results showed that the cavitation jet mill could prepare ultrafine coal powder,which is the particle size less than 8 μm with very nar-row particle size distribution.The jet pressure and material size play an important role in crushing performance of jet mill.Higher waterjet pressure led to finer products that were more spherical shaped.The bigger material size,the higher crushing efficiency will be in the jet mill.%基于高压水射流技术采用空化射流磨对不同粒径的煤样进行了破碎，从破碎后煤样的粒径分布、比表面积及形貌特征等方面研究了不同粒径的原煤样在不同射流压力下的破碎效果。试验结果表明，空化射流磨能在很短的时间内制备出粒径小于8μm 且粒径分布非常窄的超细煤粉。射流压力和进料尺寸对射流磨的破碎性能有着重要影响，即射流压力越大，产物中超细煤粉的质量分数越大，其边角越圆滑且产物粒径分布也越窄；进料尺寸越大，射流磨的破碎效率越高。