Experimental Study Of Microwave Pyrolysis Of An Indonesian Lignite

Coal pyrolysis is an important technology of the coal conversion and utilization,it has an important impact on coal gasification, liquefaction and coking, therefore, study of the coal pyrolysis is very useful, it can provide a theoretical basis for the development of clean coal utilization technologies.In this paper, a systematic experimental study of Indonesian lignite microwave pyrolysis in a modified local microwave oven is carried out. Microwave power, pyrolysis time, lignite particle size distribution and the ratio of microwave receptor to coal were selected as experimental parameters. The solid samples of fresh and after pyrolysis were characterized by XRD, SEM and particle size distribution analysis, the products of tar were analyzed by GC-MS.The results showed that with the further extension of pyrolysis time and the increase of the amount of microwave receptor and the increase of Microwave power could help the pyrolysis. Also, a burning phenomenon came out with the further extension of pyrolysis time, the increase of the amount of microwave receptor was beneficial to the gas products, the reduce of the amount of microwave receptor and the increase of Microwave power could help produce the tar. XRD analysis indicated that with the pyrolysis time increasing, Fe3O4 was reduced to Fe. SEM analysis showed that the colloidal material could be found from the surface of particles after the microwave pyrolysis and the particle porosity increased, also it was found that with the extension of the pyrolysis time, the increase of Microwave power, semi-coke had more surface cracks, however, there was little evidence to suggest a direct reaction between the particle size and the semi-coke after pyrolysis. It was found through the particle size distribution analysis that the size of semi-coke became smaller after pyrolysis and the scope widened, through the GC-MS analysis, with the extension of pyrolysis time, the Hydrocarbon products in the tar increased and with the microwave receptor increasing, phenol naphthalene and its derivatives yield more.