摘要
建立1kW级串行流化床反应器系统,以赤铁矿为载氧体进行了煤化学链燃烧试验。验证载氧体的持续循环能力,讨论燃料反应器温度对气体产物组成及CO2捕集效率的影响。在连续10h的试验中,载氧体展现出良好的稳定性和反应活性;随着温度由900℃升到985℃,燃料反应器中CO和CO2浓度迅速增加,空气反应器中CO2浓度则呈线性下降;较高的温度有利于提高CO2捕集效率。用BET比表面积、扫描电子显微镜和X-射线衍射对使用前后的载氧体进行表征,结果表明:表面轻微的烧结导致使用过的载氧体比表面积和空隙容积都有所下降;载氧体仍保持多孔结构,这有利于其与气体之间的反应。由于喷动床高速射流的存在,载氧体颗粒之间没有团聚现象。该种赤铁矿是实现煤化学链燃烧比较理想的载氧体。
A 1 kW interconnected fluidized bed reactor was built and the experiments on chemical looping combustion of coal was performed with hematite as oxygen carrier.The durability of the oxygen carrier was investigated and the effects of fuel reactor temperature on the gas compositions and CO2 capture efficiency were discussed.The oxygen carrier exhibited an excellent stability and reactivity in a continuous test of 10 h.CO2 and CO concentration in fuel reactor increased remarkably with increasing temperature from 900 ℃ to 985℃,whereas CO2 concentration in air reactor dropped linearly.A higher fuel reactor temperature would contribute to improving CO2 capture efficiency.Brunauer Emmett Teller （BET）,scanning electron microscope （SEM） and X-ray diffraction （XRD） were used to characterize both fresh and used oxygen carrier particles.The results indicated decreased specific surface area and pore volume due to slight sinter on particles surface of used oxygen carrier.However,the particles kept a porous structure facilitating reactions between reactant gases and oxygen carrier particles.No agglomeration was found between oxygen carrier particles because of high speed jet in spout fluidized bed.This hematite is a relatively ideal oxygen carrier for chemical looping combustion of coal.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第17期51-56,共6页
Proceedings of the CSEE
基金
国家自然科学基金项目(20590367
90610016)~~
关键词
化学链燃烧
串行流化床
煤
载氧体
赤铁矿
chemical looping combustion
interconnected fluidized bed
coal
oxygen carrier
hematite
