不同粒度北露天褐煤的热解特性

Pyrolysis characteristics of Beilutian lignite of different particle sizes

为考察褐煤固定床热解过程的适宜粒度范围，以典型的北露天褐煤为研究对象，在自制的3奴固定床热解装置上进行了粒度0～50mm煤样的热解试验。考察了粒度对热解产物、热解时间、挥发物中含尘量的影响。结果表明，褐煤粒度从0～10mm增至40～50mm，热解时间、焦油和荒煤气中含尘量都呈减小趋势，热解时间从197min减少到164min，单位体积荒煤气中含尘量从0．0220mg／L减少到0．0113mg／L，且焦油中含尘量均大于荒煤气中含尘量；粒度为20～30mm时，褐煤热解过程的挥发物逸出阻力较小，二次反应和碳沉积概率较小，比较适宜热解。

In order to study the optimal particle size for lignte pyrolysis in the fixed bed, taking Beilutian lignite as coal samples,the pyrolysis experiments of 0 to 50 mm particle size coal samples in a self-made 3 kg fixed bed pyrolysis deviee were conducted. The influence of lignite partMe size on pyrolysis products, pyrolysis time and dust content in volatile matter were investigated . The results showed that, with the lignite particle size increasing from 0 - 10 mm to 40 -50 ram, the pyrolysis time and dust content in tar and coke-oven gas decreased. The pyrolysis time reduced from 197 minutes to 164 minutes,the dust content in the raw gas per unit volume decreased from 0. 022 mg/L to 0. 011 3 mg/L,and the dust eontent in the tar was greater than that in the raw gas. The lignite of 20-30 mm particle size was suitable tor pyrolysis, because the resistance of volatiles escape during pyrolysis was smaller and the secondary reaction and earbun deposition hardly occurred.