连续式超临界水反应器中褐煤制氢过程影响因素的研究

建立了煤处理量为1kg/h的连续式超临界水反应装置并实现稳定运行，考察了反应温度（500℃～650℃）、反应压力(20MPa～30MPa)、水煤浆浓度(20%~50％)以及KOH添加量对小龙潭褐煤在超临界水中连续化制氢的影响。实验结果表明，反应进行20min后连续装置达到稳定运行状态。反应温度和KOH添加量是影响超临界水中褐煤制氢的关键因素。随着反应温度从500℃提高到650℃，氢气的体积分数与产率分别由11%和25mL/g增加到29%和110mL/g。添加0.5%KOH可明显提高碳气化率以及氢气的产率，但随着KOH加入量进一步增加，氢气产率增加的幅度减小。随着压力增加，甲烷产率有升高的趋势，氢气产率变化不大，提高水煤浆的浓度,碳气化率降低。

Continuous hydrogen generation from lignite in supercritical water

For the production of hydrogen from lignite, a Supercritical Water (SCW) reactor with a coal feed rate of 1kg/h was set up, which was operated with continuous feeding of coal water slurry. The effects of reaction temperature (500℃～650℃), pressure (20MPa~30MPa), slurry concentration (20%~50%) and catalyst loading amount (0%~1% of coal) on the hydrogen generation characteristics were investigated. It is found that there is a notable increase in the hydrogen content and yield with the elevation of the reaction temperature. The hydrogen concentration and yield increase from 11% and 25mL/g coal to 29% and 110mL/g coal when the temperature increases from 500℃ to 650℃. The formation of methane is favored with the increase of reaction pressure. However, the carbon gasification rate and hydrogen yield decrease with the increase of slurry concentration. Moreover, the addition of 0.5% KOH can greatly improve the hydrogen production from high concentration coal water slurry. It is indicated that the reaction temperature and catalyst loading amount have a significant influence on the coal conversion and hydrogen yield, while the effect of pressure is relatively less significant.