褐煤改性与级配成浆特性研究

Influence of modification and grain-size gradation on slurryability of lignite

以邵通褐煤和呼伦贝尔褐煤为研究对象,在进行工业分析和元素分析的基础上,研究褐煤改性前后物理化学性质的变化。确定了褐煤的最佳改性条件:原煤粒度<1 mm,加热停留时间为0.5 h,加热温度为250℃。进行了改性褐煤级配成浆特性试验研究。结果表明:合适的改性温度为250～300℃,最佳煤样粗细粉的质量比为60∶40,经过改性后的邵通褐煤和呼伦贝尔褐煤级配成浆浓度分别比改性前提高了5.4%以上和3.6%以上。

Taking Shaotong lignite and Hulun Buir lignite as research objects, the proximate analysis and elemental analysis were done for these two kinds of lignites. Investigated the change of physical and chemical properties after modification. The optimal modification condition is that the coal granularity is less than 1 mm, heating time is 0. 5 h, heating temperature is 250 ℃. Study the influence of gradation on the slurryability of modified lignite. The results show that the appropriate modification temperature ranges from 250 ℃ to 300℃ ,the optimum mass ratio of grainsize gradation is 40：60, the slurry concentration of modified Shaotong lignite and Hulun Buir lignite improves by more than 5.4 percent and 3.6 percent respectively.