无烟煤水煤浆燃烧特性和气化特性研究

为了提高水煤浆成浆浓度,选取一种无烟煤作为研究对象,分别利用常规研磨工艺和分级研磨工艺进行制浆实验考察其成浆性能。结果表明:利用分级研磨工艺优化粒度后,水煤浆浓度能达到67.3%,成浆性良好。选取2种工艺制得的样品进行了燃烧特性实验,发现采用分级研磨工艺制得的样品的燃点和燃烬温度有一定程度的降低,燃烬指数增大,加入助燃剂后该特性更加明显,这是由于分级研磨工艺所制水煤浆中细颗粒含量增加,反应活性变好。重点考察了不同催化剂加入量对煤样气化反应活性的影响。随着催化剂加入量的增加,气化反应活性有不同程度提高,实验样品的催化剂的最佳加入量为0.2%。 To inprove the mass concentration of coal water mitture( CWM),a type of anthracite was selected as raw material to investigate its slurryability. Traditional and classified grinding CWM preparation processes were used in the tests. The results show that,the concentration of CWM reaches to 67. 3% when the anthracite particle size distribution is optimized by classified grinding process. Investigate the combustion characteristics of the CWM samples prepared by traditional and classified grinding processes. It is found that the ignition point and burnout temperature reduce in some extent and the burnout index increase. The combustion improver makes this characteristics more obvious. This is because classified grinding process increases the small size coal particles which has better reactivity. Meanwhile,the effects of catalyst content on gasification reactivity are investigated. The results prove that,the catalyst improves the gasification reactivity. The optimum added content of catalyst is 0. 2% for the samples