在钙基载氧体燃煤化学链燃烧技术过程中由于煤气化产物与载氧体之间的副反应导致反应过程中产生大量的SO_2气体。本文选择MAC铁矿石,CaO和石灰石作为脱硫剂,在小型加压固定床上研究不同温度、压力、Ca/S比条件下SO_2气体的脱除问题。结果表明,单独采用CaSO_4载氧体时,随温度升高SO_2气体浓度逐渐增加。添加铁矿石后,SO_2排放浓度降低,主要与Fe_2O_3能够催化抑制CaSO_4分解有关。添加CaO和石灰石脱硫剂后,随温度、压力以及Ca/S比增加,两种脱硫剂的脱硫效率均增加,且在相同的实验条件下得到的CaO的脱硫效果更佳。
In the process of chemical-looping combustion of coal with calcium-based oxygen carrier, large amount of SO_2 was released due to the side reactions occurred between CaSO_4 oxygen carrier and coal gasification products.In this work,desulfurization experiments were conducted using MAC iron ore,CaO and limestone as desulfurizers in a laboratory scale pressurized fixed-bed reactor.The influencing factors of temperature,pressure and Ca/S ratio on the removal of SO_2 gas were analyzed. The results showed that the outlet concentration of SO_2 increased with the increase of temperature in the presence of only CaSO_4 oxygen carrier.Adding MAC iron ore into the reactor could reduce the concentration of SO_2 released from the reactor due to the catalytic effect of Fe_2O_3 on suppressing the decomposition of CaSO_4.The desulfurization efficiency of both CaO and limestone showed an increased trend with the increase of temperature,pressure and Ca/S ratio,and CaO showed a better performance than limestone under the same experimental conditions.
参考文献
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| [2] | 颜岩,彭晓峰,傅国光,王补宣.氧化钙脱硫过程反应动力学研究[J].热科学与技术,2002(01):46-51. |
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