停留时间对氧化钙催化裂解焦油的影响  

Effect of Residence Time on Tar Catalytic Cracking Behavior with Calcium Oxide

作　　者：贾永斌[1] 黄戒介[1] 王洋[1] 

机构地区：[1]中国科学院山西煤炭化学研究所,太原030001

出　　处：《燃烧科学与技术》2004年第6期549-553,共5页Journal of Combustion Science and Technology

基　　金：国家重点基础研究发展规划资助项目(G1999022103);中科院知识创新工程重要方向资助项目(KGCX2 SW 308).

摘　　要：为降低煤在热解过程中的焦油产率,同时得到高质量的煤气,在一流化床稀相段考察了不同温度下停留时间对氧化钙催化裂解焦油的影响,由于稀相段几乎没有气泡,所以氧化钙能与焦油进行良好的接触,从而有利于提高氧化钙对焦油催化裂解的影响.研究结果表明,氧化钙的加入明显降低了焦油的产率,且随着停留时间的增加对焦油产率的影响迅速增大,只是在750℃下,当停留时间超过3s时氧化钙的影响开始有所减弱.同时,氧化钙的加入增加了H2、CO以及脂肪烃类的产率,且明显地增加了气体的热值.The effect of residence time on the catalytic behavior of calcium oxide in tar cracking at different temperatures in the freeboard of a fluidized bed was investigated in order to decrease the amount of tar produced by coal pyrolysis and simultaneously to make coal gas have high quality. There exist almost no bubbles in the freeboard, so the calcium oxide well contacted with the tar, which is of benefit to improving the effect of calcium oxide on tar cracking. The results show that the yield of tar is reduced apparently by the addition of calcium oxide and the effect of calcium oxide on the yield of tar increases quickly as residence time rises, but at 750°C the effect of calcium oxide begins to decrease when residence time is above 3 s. The addition of calcium oxide also increases the yields of H2, CO, aliphatic hydrocarbons and the thermal value of gas.

关 键 词：焦油裂解 氧化钙 流化床 停留时间 

分 类 号：TQ530.2[化学工程—煤化学工程]