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采用流化床反应器以水蒸气作为气化介质,以K_2CO_3修饰后的铁矿石作载氧体,进行煤化学链燃烧还原试验。结果表明,钾基铁矿石对水煤气反应及CO变换反应有明显的催化效果,大大提高反应速率,缩短反应平衡时间,有利于提高CO_2体积份额。随着载氧体中K_2CO_3负载量由0%增加到20%,碳转化平衡时间逐步缩短,煤在58 min内的碳转化率呈逐渐增加趋势,CO2体积份额呈先增大后减小趋势,在6%K_2CO_3负载量时达到最大值。SEM结果显示钾基铁矿石表面呈一定烧结状态,铁矿石中K_2CO_3负载量不宜过高。
The fluidized bed reactor was used as the vaporization medium with water vapor, and the iron ore modified with K_2CO_3 was used as the oxygen carrier to carry out the coal chemical chain combustion reduction test. The results show that potassium-based iron ore has obvious catalytic effect on water gas reaction and CO shift reaction, which greatly improves the reaction rate, shortens the reaction equilibrium time and increases the CO 2 volume fraction. As the loading of K_2CO_3 in oxygen carrier increased from 0% to 20%, the carbon conversion time gradually shortened, the carbon conversion rate of coal gradually increased in 58 min, the volume fraction of CO2 increased first and then decreased, At 6% K 2 CO 3 loading reached its maximum value. SEM results showed that the surface of potassium-based iron ore showed a certain sintering state, and the loading of K_2CO_3 in iron ore should not be too high.