流化床上铜基载氧体的反应特性和积碳特性研究  

Study of the Reaction and Carbon Deposition Characteristics of the Cu-based Oxygen Carriers in a Fluidized Bed

作　　者：董振[1] 金晶[1] 高新勇[1] 曾武勇[1] 

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《热能动力工程》2014年第1期86-91,111,共6页Journal of Engineering for Thermal Energy and Power

基　　金：上海市教委科研创新资助项目(12ZZ141)

摘　　要：利用小型流化床实验台对机械制备的Cu基载氧体在4个反应温度(650℃、750℃、850℃和950℃)和两种气氛(CH4和CO+H2)下进行了实验研究,结果表明:两种气氛下Cu基载氧体的还原转化率并不随温度的升高而单调递增,而是有个最佳反应温度,分别为750℃和850℃;由于CH4气氛下Cu基载氧体表面的积碳比CO+H2气氛下严重,因此4个温度下Cu基载氧体的还原转化率都比CO+H2气氛下低,这也说明CO+H2比CH4更适合Cu基载氧体的化学链燃烧。为了避免因积碳而带来的载氧体失活,在管式炉内进行CO和载氧体的燃烧反应时,向炉内通入水蒸气,结果发现Cu基载氧体表面的积碳得到有效抑制。By using a small-sized fluidized bed test rig,the authors conducted an experimental study of the Cu-based oxygen carrier mechanically prepared under four reaction temperatures,i. e. 650,750,850 and 950 ℃ and in two atmospheres,i. e.,CH4and CO + H2. it has been found that the reduction conversion rates of the Cu-based oxygen carrier in the two atmospheres will not monotonely increase with a rise of the temperature but have their optimum reaction temperatures,being 750 and 850 ℃ respectively. Due to the carbon deposition on the surface of the Cu-based oxygen carrier under the CH4atmosphere being more serious than that under the CO + H2atmosphere,the reduction conversion rates of the Cu-based oxygen carrier under the above-mentioned four temperatures are all lower than those under the CO + H2atmosphere. This indicates that the CO + H2atmosphere is more suitable for the chemical chain combustion of the Cu-based oxygen carrier than the CH4atmosphere. To avoid the inactivity of the oxygen carrier due to the carbon deposition,when the combustion reaction of CO and the oxygen carrier was being conducted in a tube type furnace,steam was introduced into the furnace. It has been found that the carbon deposition on the surface of the Cu-based oxygen carrier can be prohibited effectively.

关 键 词：小型流化床 铜基载氧体 反应特性 积碳特性 

分 类 号：TK16[动力工程及工程热物理—热能工程] TQ511.1[化学工程]