反应气氛对碳酸钾催化煤加压热解特性的影响  

Effects of Atmospheres on K_(2)CO_(3) Catalytic Pressurized Pyrolysis of Coal

作　　者：张永 曲旋[1] 张荣[1] 毕继诚[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,太原030001 [2]中国科学院大学,北京100049

出　　处：《煤炭转化》2018年第1期19-26,共8页Coal Conversion

基　　金：国家重点基础研究发展计划(973)项目(2011CB201305); 国家自然科学基金资助项目(21576275)

摘　　要：以内蒙古不连沟次烟煤为原料,在加压热解装置中考察了530℃,3.5MPa条件下热解气氛(N_2+H_2,N_2+H_2O和N_2+H_2O+H_2)对碳酸钾催化剂催化煤热解产物产率及性质的影响.结果表明:碳酸钾的分解以及碳酸钾催化剂促进煤中含氧官能团的断裂,导致大量CO_2的产生;与N_2气氛下催化热解相比,N_2+H_2和N_2+H_2O气氛促进了焦油和CH_4的生成;在N_2+H_2O+H_2气氛下热解,焦油产率进一步增至7.62%,CH_4产率增至2.06%;相同气氛下有/无催化剂的热解实验结果表明,H_2对碳酸钾催化剂的催化作用影响较小,H_2O气氛下碳酸钾能促进碳水气化反应的进行;实验考察范围内,气氛的改变对热解半焦的比表面积及其气化反应特性的影响较小.The effects of K2CO3 and atmospheres（N2 ＋H2 ,N2 ＋H2O and N2 ＋H2O＋H2 ）on the yields and properties of products from pyrolysis of a sub-bituminous coal named Bulian＇gou from Inner Mongolia was investigated in 3.5 MPa pressurized reactor at 530 ℃.The results show that the decomposition of K2CO3 and the addition of K2CO3 promoting the fracture of oxygen-containing functional groups in coal enhance the production of CO2 substantially.Compared with the catalytic pyrolysis in N2 atmosphere,the yields of tar and CH4 are promoted with the addition of H2 and H2O.Moreover,during pyrolysis in N2 ＋ H2O＋ H2 atmosphere,the yields of tar and CH4 further increase to 7.62% and 2.06% ,respectively.The results obtained from the catalytic and non-catalytic pyrolysis in N2 and N2 ＋H2 atmosphere show that effect of H2 atmosphere on the catalytic performance is limited.In addition,K2CO3 promotes the carbon gasification reaction in H2O atmosphere.Within the scope of the experimental study,effects of changing the atmosphere on the specific surface area and gasification reactivity of chars are not obvious.

关 键 词：次烟煤 加压热解 碳酸钾 氢气 水蒸气 

分 类 号：TQ530.2[化学工程—煤化学工程]