Study On The Rapid Pyrolysis And The Char Gasification Reactivity Of Coal Water Slurry

The rapid pyrolysis of the coal water slurry of typical coals in China were studied. The char yields of coal water slurry and parent coal were compared, physical and chemical structures and gasification characteristics of the char were investigated. The main contents and results were summarized as follows:Char yields of the coal(coke) and coal(coke) water slurry of lignite, bituminous, anthracite and petroleum coke were investigated. Results shows that, for the bituminous and lignite, the yields of char of CWS are different from that of the parent coal, and for the anthracite and petroleum coke, the char yields of coal(coke) water slurry were close to that of the coal(coke). It can be found that the evaporation of the water and the gasification reaction play an important part for the pyrolysis of the CWS of bituminous and lignite, the gasification reactivity of the char of CWS is better than that of coal.The pore structures of char of CWS and parent coal of lignite and bituminous were studied, and both the specific surface and shape of pores were investigated. For the bituminous and lignite, It can be found from the adsorption/desorption isotherm that the slit pores are the dominant forms of the pore structure for the char of coal, and the wedge shape pores are the dominant forms of the pore structure for the char of CWS, and the evaporation of the process plays an important role on the structure of the char of CWS, and the fractal theory is also used to analyze the structure. For the bituminous and lignite, the modified random pore model can fit the gasification curve very well, and It can be found that the char of parent coal and CWS have different activation energy.