【摘要】 建立了煤处理量为1 kg/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(20 MPa~30 MPa)、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20 min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25 mL/g增加到29%和110 mL/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。更多还原

【Abstract】 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.更多还原