Study On The Pyrolysis Characteristics Of Coal (catalytic) In Xinjiang

The present situation of energy in China is lack of oil and gas resources, but relatively rich in coal resources. And there are more than 80% of coal is direct combustion, this will result in low resource utilization of coal and high pollution. Including low rank coal and lignite from low rank bituminous is accounted 50% of the country’s coal reserves. And the coal quality is rich in volatile, low ash, low sulfur, low phosphorus and high activity, so low rank coal is the ideal raw material in low temperature pyrolysis. In this paper, mainly for low rank coal——Xinjiang coal of low temperature pyrolysis system, develop coal pyrolysis catalyst, effective regulation pyrolysis product composition and distribution. Pyrolysis/catalytic pyrolysis characteristics and the characteristics of the products of Xinjiang coal have been studied by using TG-FTIR spectrometer and self powder-particle fluidized bed.MCM-41 zeolite is prepared by hydrothermal synthesis and modified catalyst is prepared with equal volume impregnation method. The catalysts were detected by XRD, FTIR, SEM, EDS, NH3-TPD and BET.The paper studied different atmospheres, different molecular sieve and reforming catalyst for pyrolysis characteristics of Xinjiang coal by TG-FTIR spectrometer. Under different conditions were analyzed of Xinjiang coal dynamics to study the pyrolysis characteristics. Experimental results show that under different atmospheric,5%H2/N2 atmosphere make the pyrolysis product of CO2, CH4, light aromatic compounds increased to some extent, so hydrogen is beneficial to the coal pyrolysis process; Molecular sieve 13X and MCM-41 are improvement of pyrolysis products to a certain extent,13X has improved to some extent, but MCM-41 has a certain decreases for weight loss. Effect of reforming catalyst for pyrolysis, loading transition metal Mo, the 3.5%Mo/13X and 3.5%Mo/MCM-41 catalyst for pyrolysis effect is more ideal. While loading bimetallic Co-Mo, the 3.5%Co-15%Mo/13X and 3.5%Co-15%Mo/MCM-41 catalyst for pyrolysis effect is better than loading Mo, can effectively regulate pyrolysis products and distribution; Kinetic analysis can be found by Coats-Redfern method, the 5%H2/N2 atmosphere, molecular sieve catalyst and reforming catalyst can be effectively reduced lively pyrolysis stage of activation energy. And the 3.5%Co-15%Mo/13X and 3.5%Co-15%Mo/MCM-41 catalyst to reduce activation energy is better.Using powder-particle fluidized bed studied the different atmosphere, different gas flow rates, different temperatures and catalyst for distribution of Xinjiang coal pyrolysis products and the impact on pyrolysis product characteristics. Experimental results show that hydropyrolysis can slightly increase tar yield and make the benzene content increased 56% in BTX; When the gas velocity is 0.28 m/s pyrolysis tar yield is the maximum of 8.03%; As the pyrolysis temperature increases, the tar yield reached a maximum at 650 ℃, BTX yield increased; Compared with 650℃ Xinjiang coal hydropyrolysis, when 3.5%Co-15%Mo/13X and 3.5%Co-15%Mo/MCM-41 catalytic pyrolysis, the tar yield increased by 13.8% and 16.2%, BTX yield increased by 65.5% and 83.5%; Using GC-MS analysis catalytic pyrolysis tar composition can be found light aromatic and polycyclic aromatic hydrocarbons generated has a certain role in promoting, so reforming catalyst can promote the light tar.