复合赤铁矿和铜矿石载氧体在化学链燃烧中的循环反应性能研究
摘要：单一天然矿石载氧体(oxygen carrier，OC)由于存在反应活性差且循环稳定性低的问题，限制了其在工业上的应用。针对喷雾干燥造粒法制备的复合赤铁矿和铜矿石OC，在流化床热重分析仪(fluidized bed thermogravimetric analyzer，FB-TGA)上对其进行了长期化学链燃烧(chemical looping combustion，CLC)循环测试。结果表明：新鲜OC颗粒表面存在部分富集的细微颗粒，较大的机械应力导致OC在流化初期磨损率较高，流化6 min后颗粒磨损率稳定在0.28%/h。在氧化还原循环反应过程中，OC受到化学应力和热应力的作用，机械强度降低，颗粒磨损和烧结加剧。此外，颗粒烧结抑制了氧化阶段的进行，导致OC被深度还原至更低价态，从而促进了颗粒团聚并最终完全失流。因此，降低载氧率和在燃料反应器中的停留时间有利于OC在工业上的安全运行。
Abstract:The low reactivity and low cycle stability of single natural oxygen carrier (OC) limit its application in industry. Composite OC of hematite and copper ore was prepared by spray drying granulating method, and the chemical looping combustion (CLC) cycle test was performed on the fluidized bed thermogravimetric analyzer (FB-TGA). The results show that the attrition rate of OC is relatively high at the initial stage of fluidization due to the presence of some enriched fine particles on the surface of fresh OC particles, and the particle attrition rate is stable at 0.28%/h after 6 min of fluidization. In the process of redox cycle reaction, the mechanical strength of OC is reduced by chemical stress and thermal stress, and the particle attrition and sintering are intensified. In addition, the particle sintering inhibits the oxidation stage, leading to the deep reduction of OC to a lower state, which promotes particle agglomeration and eventual defluidization. Therefore, the reduction of oxygen carrier rate and residence time in fuel reactor is beneficial to the safe operation of OC in industry.
标题：复合赤铁矿和铜矿石载氧体在化学链燃烧中的循环反应性能研究
title:Study on Cycling Reaction Performance of Composite Hematite and Copper Ore Oxygen Carrier in Chemical Looping Combustion
作者：苗桢武, 沈来宏, 赵海波
authors:Zhenwu MIAO, Laihong SHEN, Haibo ZHAO
关键词：CO2捕集,化学链燃烧,循环反应性能,喷雾干燥造粒,载氧体,团聚,
keywords:CO2 capture,chemical looping combustion,cycling reaction performance,spray drying granulation,oxygen carrier (OC),agglomeration,
发表日期：2022-08-31
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