基于草木灰修饰铁矿石载氧体的串行流化床化学链燃烧实验

Experimental investigation of chemical looping combustion in interconnected fluidized bed reactor using iron ore oxygen carrier modified by plant ash

中文关键词: 草木灰  铁矿石  载氧体  串行流化床  化学链燃烧

英文关键词: plant ash  iron ore  oxygen carrier  interconnected fluidized bed  chemical looping combustion

中文摘要:

      采用草木灰对铁矿石载氧体进行修饰，在1kWth串行流化床反应器上，以合成气（CO H2 CH4）为燃料进行了化学链实验，对其反应活性进行测试。结果表明：生物质灰修饰铁矿石载氧体在1 kWth串行流化床上表现出较高的反应活性，且反应温度越高，反应活性越好；燃料反应器出口CO和CH4体积百分数显著降低，930 ℃下分别为0.12%和2.63%，与采用纯铁矿石相比分别降低了97.3%和16.0%，CO2捕集效率提升明显，最大值达89.38%；SEM分析表明，反应后的铁矿石颗粒表面出现了晶粒熔融粘接的现象，但生物质灰修饰铁矿石的孔隙结构仍较为明显；EDS分析表明生物质灰修饰铁矿石中K的负载情况较为稳定，没有出现明显的流失现象。

英文摘要:

      Plant ash was utilized to modify an iron ore oxygen carrier. Chemical looping combustion of a syngas (CO H2 CH4) was experimentally carried out in a 1 kW interconnected fluidized bed reactor, evaluating the reactivity of the modified oxygen carrier. The results indicated that the biomass ash-modified iron ore showed high reactivity in the 1 kW interconnected fluidized bed and the reactivity of oxygen carrier increased with temperature. The concentration of CO and CH4 leaving the fuel reactor was significant reduced to 0.12% and 2.63% at 930 ℃, reduced by 97.3% and 16.0% when using iron ore. Meanwhile, the CO2 capture efficiency was significant increased with the maximum at 89.38%. SEM results indicates that slight sintering was observed on the biomass-modified iron ore after reaction, but the porous structure of particle was still maintained. The EDS results showed that the content of alkali metal K in the biomass ash-modified iron ore could efficiency maintained.