The multi-stage hydropyrolysis (holding near the peak temperature of 500 and 600 ℃ for 10 min,respectively)of Xianfeng lignite was investigated at heating rates of 5 ℃*min-1 and 25 ℃*min-1 in a 10 g fixed-bed reactor.The effects of residence time,heating rate,gas flow and pressure on product yields of hydropyrolysis with different heating methods were studied.Higher yields of tar are obtained in multi-stage HyPy than in normal HyPy.The results showed that the tar yields and overall conversions at high heating rates in multi-stage hydropyrolysis approximated to those at constant slower heating rates;the retention effect is remarkable with increasing heating rate,pressure and hydrogen flow.The experiments under syngas exhibited the potential advantage of multi-stage HyPy in industrial utilization.%在10 g加压固定床上考察了5 ℃*min-1和25 ℃*min-1的升温速率下先锋褐煤的多段加氢热解过程.详细考察了有关的工艺参数如停留时间、升温速率、气体流量、反应压力及反应气氛对多段加氢热解过程产物分布的影响，并与同等条件下的单段加氢热解过程进行了对比分析.实验结果表明：多段加氢热解过程明显优于同等反应条件下的单段加氢热解过程，采用快速升温、多段停留的手段基本可以达到慢速升温过程高的转化率及油收率；多段加氢热解过程中的停留作用随升温速率的增大、反应压力的增加、氢气流量的增大而显著增大.另外还发现合成气气氛下的多段停留作用与氢气气氛下的相类似.
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