【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（N₂+H₂,N₂+H₂O和N₂+H₂O+H₂）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CO₂的产生;与N₂气氛下催化热解相比,N₂+H₂和N₂+H₂O气氛促进了焦油和CH₄的生成;在N₂+H₂O+H₂气氛下热解,焦油产率进一步增至7.62%,CH₄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,H₂对碳酸钾催化剂的催化作用影响较小,H₂O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.更多还原

【Abstract】 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.更多还原