高铝耐火砖负载CuO氧载体的化学链氧解耦特性实验  

Characteristics tests of a high-alumina refractory supported CuO oxygen carrier during chemical looping with oxygen uncoupling

作　　者：刘沛聪 梅道锋 晏水平 LIU Peicong;MEI Daofeng;YAN Shuiping(Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River,Ministry of Agriculture and Rural Affairs,Wuhan 430070,Hubei,China;College of Engineering,Huazhong Agricultural University,Wuhan 430070,Hubei,China)

机构地区：[1]农业农村部长江中下游农业装备重点实验室,湖北武汉430070 [2]华中农业大学工学院,湖北武汉430070

出　　处：《化工进展》2019年第12期5351-5359,共9页Chemical Industry and Engineering Progress

基　　金：国家重点研发计划(2018YFB0605402);湖北省自然科学基金(2018CFB376);国家自然科学基金(51676080);中央高校基本科研业务费专项基金(2662016QD043)

摘　　要：耐火砖常用作高温炉膛材料,具有较高的破碎强度和较强的抗烧结性能。以耐火砖颗粒为惰性载体,采用连续浸渍法制备CuO质量分数为10%~30%的Cu10RefBri、Cu25RefBri和Cu30RefBri氧载体样品,并在热重分析仪(TGA)和批次进料流化床反应器中900~950℃下进行了化学链氧解耦燃烧过程氧载体的释氧-吸氧循环实验测试。结果显示,在上述氧载体样品中Cu25RefBri的释氧速率最高,可达9×10^-5kgO2/(s·kgOC),流化床中稳定的O2体积分数可达1.1%。然而,随着循环次数增加,Cu25RefBri的释氧速率逐渐降低至2.0×10^-5kgO2/(s·kgOC),同时流化床尾气中O2体积分数降低至0.7%,该值远低于对应温度下的平衡O2浓度值。氧浓度和释氧速率降低的主要原因在于:循环过程氧载体中形成的低释氧活性的CuAl2O4尖晶石含量逐渐增加,导致氧载体总体活性下降。此外,在950℃流化床实验过程,还检测到氧载体颗粒的烧结现象。Refractory brick which is usually used as high-temperature furnace material has high crushing strength and high agglomeration resistance. In this work, a type of high-alumina refractory brick particles were used as support material for Cu-based oxygen carrier preparation. Three samples containing 10%-30%of CuO, denoted as Cu10 RefBri, Cu25 RefBri and Cu30 RefBri, were prepared with successive impregnation method and then subjected to the tests in TGA and fluidized bed reactor under 900-950℃to explore their characteristics on oxygen release and uptake. The Cu25 RefBri sample showed the highest rate of oxygen release in TGA tests(as high as 9×10^-5 kgO2/(s·kgOC)), thus presented a stable O2 volume fraction of 1.1%. However, as the number of cycles increased, the rate of oxygen release decreased to as low as 2.0×10^-5 kgO2/(s·kgOC), meanwhile the O2 volume fraction reduced to 0.7%, which is much lower than that for equilibrium case. The main reason for the decrease of oxygen release activity could be the formation of low-reactive crystalline CuAl2 O4, the concentration of which increased as a function of cycles.Moreover, agglomeration of Cu25 RefBri was noticed at a temperature of 950℃ in the fluidized bed reactor.

关 键 词：化学链氧解耦 铜基氧载体 团聚 流化床 失活 

分 类 号：TQ534[化学工程—煤化学工程]