颗粒粒度对Cu基载氧体反应性能的影响

Influence of Particle Size on the Performance of Cu-based Oxygen Carrier

基于化学链燃烧新流程,采用固定床反应器研究了Cu基载氧体粒度、作为活性组分的Cu粉粒度及作为惰性载体的γ-Al2O3粒度对载氧体反应性能的影响.结果表明,载氧体的还原率及氧化率随Cu粉粒度减小而增大,Cu粉平均粒度小于63μm时,载氧体还原率和氧化率达95%和93%以上.载氧体还原过程中有少量CH4生成,生成量随Cu粉粒度减小而减少,Cu粉平均粒度小于32μm时低于1%;当载氧体粒度接近γ-Al2O3粒度时,载氧体的性能明显降低,只有γ-Al2O3粒度明显小于载氧体粒度时,γ-Al2O3才能起到分散活性组分、抑制活性组分烧结的作用.

Based on a new chemical looping combustion （CLC） process, the effects of sizes of oxygen carder particles, Cu powder and γ-Al2O3 powder on the performances of oxygen cartier were investigated in a fixed bed reactor. The results show that reduction and oxidation rates of oxygen carrier increase as the size of Cu powder decreases. For Cu powder with the mean size below 63μm, the reduction and oxidation rates of oxygen cartier reach above 95% and 93%, respectively. In the reduction step, a small amount of CH4 is generated, and it decreases as the size of Cu powder decreases. For Cu powder with the mean size below 32μm, the amount of CH4 is decreased to below 1%. When the size of oxygen cartier is close to the size of γ-Al2O3, the performances of oxygen carrier are significantly reduced. Only when the particle size of γ-Al2O3 is significantly smaller than the particle size of oxygen carrier, the γ-Al2O3 can effectively disperse the particles of active component, and then inhibit its sintering.