无烟煤较高比例参与配煤炼焦最佳粒度研究

Study of the Optimal Particle Size of Anthracite in Coal Blending Coking in a Higher Proportion

为开发较高比例无烟煤参与配煤炼焦的技术,研究了无烟煤配比为12%时,无烟煤合适的粒度控制范围及结焦机理,通过不同粒度无烟煤参与配煤炼焦试验,得出无烟煤的粒度对其参与配煤炼焦所得焦炭的冷热态强度均有明显影响。随着无烟煤粒度增大,焦炭光学组织中大于300μm的惰性组分增多,焦炭冷热态强度呈下降趋势,这些大尺寸惰性组分周围基本无其他组分包裹,形成明显裂纹;用12%的无烟煤替代瘦煤,无烟煤粒度小于0.3 mm时,焦炭冷热态强度保持稳定。试验得出:无烟煤较高比例参与配煤炼焦的最佳粒度为小于0.3 mm。

In order to develop technology of coking with coal blend with a higher proportion of anthracite, the suitable particle size control scope and coking mechanism of anthracite when the anthracite ratio was 12% was studied. Through tests of anthracite in coal blending with different particle sizes, it was concluded that the particle size of anthracite had obvious influences on the cold and thermal strength of coke obtained through coking with coal blend. With the increase of the particle size of anthracite, inert component more than 300 μm in the coke optical texture increased and coke cold and thermal strength decreased. Besides, the big dimension inert component was not enclosed by other components and obvious crack was formed.When 12% anthracite was the substitute for lean coal and the particle size was less than 0.3 mm, coke cold and thermal strength remained stable. The conclusion was that the optimal particle size of anthracite in coal blending coking in a high proportion was less than 0.3 mm.