流态化下电石渣循环煅烧/碳酸化捕集CO_2特性  

CO_2 Capture Characteristics of Carbide Slag in Cyclic Calcination/Carbonation Under Fluidization State

作　　者：李英杰[1] 谢辛[1] 孙荣岳[1] 时雷[1] 

机构地区：[1]山东大学能源与动力工程学院,山东省济南市250061

出　　处：《中国电机工程学报》2014年第26期4447-4453,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51006064;51376003)~~

摘　　要：在鼓泡流化床上研究电石渣在循环煅烧/碳酸化反应中的 CO2捕集特性，考察循环次数、反应温度、流化数和颗粒粒径对流态化下电石渣循环碳酸化转化率和速率的影响。结果表明：循环次数增加使电石渣碳酸化转化率衰减，经过50次循环其转化率可达0.2，高于石灰石。反应初期，电石渣碳酸化速率低于石灰石，但经过一段时间后高于石灰石。碳酸化温度为700℃，煅烧温度为850~900℃时可使电石渣保持较高循环捕集 CO2性能。增加流化数提高了电石渣化学反应控制阶段的碳酸化速率，对产物层扩散阶段速率影响较小。颗粒粒径增大对化学反应控制阶段速率影响不大，但降低了产物层扩散阶段速率。The CO2 capture behavior of carbide slag in cyclic calcination/carbonation reactions was investigated in a bubbling fluidized bed reactor. The effects of cycle number, reaction temperature, fluidization number and particle size on cyclic carbonation conversions and rates of carbide slag were examined. The results show that the carbonation conversion of carbide slag decreases with the number of cycles and achieves about 0.2 after 50 cycles, which is higher than that of limestone. In the initial reaction stage, the carbonation rate of carbide slag is lower than that of limestone, but after a time the former is higher than the latter. Carbide slag maintains higher CO2 capture capacity for carbonation at 700℃ and for calcination at 850~900℃. The carbonation rate of carbide slag in the chemical reaction-controlled stage increases with increasing fluidization number, while that in the product layer diffusion-controlled stage does not change apparently. The increase of particle size does not affect the carbonation rate of carbide slag in the chemical reaction-controlled stage, but it decreases the carbonation rate in the product layer diffusion- controlled stage.

关 键 词：流态化 电石渣 循环煅烧/碳酸化 CO2捕集 

分 类 号：TQ534[化学工程—煤化学工程]