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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。
The 1kW series fluidized bed reactor system was established and the coal chemical combustion was carried out with hematite as oxygen carrier. Verify the continuous cycling ability of the oxygen carrier and discuss the effect of the temperature of the fuel reactor on the gas product composition and the CO2 capture efficiency. The oxygen carrier showed good stability and reactivity in continuous 10h test. As the temperature rose from 900 ℃ to 985 ℃, the concentration of CO and CO2 in the fuel reactor increased rapidly. The CO2 concentration in the air reactor was Linear decline; higher temperatures help to improve the efficiency of CO2 capture. The BET specific surface area, scanning electron microscopy and X-ray diffraction were used to characterize the oxygen carrier before and after use. The results showed that: the slight sintering of the surface led to the decrease of the specific surface area and the void volume of the used oxygen carrier; Still maintain the porous structure, which is conducive to its reaction with the gas. Due to the presence of high velocity jet in the spouted bed, there is no agglomeration of the oxygen carrier particles. This kind of hematite is an ideal oxygen carrier for coal chemical chain combustion.