低阶煤热解气化一体化技术开发及试验OA

[Purposes]Two sets of pressurized pyrolysis laboratory test devices with a feed rate of 10 kg/h and a set of coal to coal-tar and semi-coke to syngas integrated technology(CCSI)pilot plant with a feed rate of 36 t/d are built by Shaanxi Yanchang Petroleum(Group)Co.,Ltd.[Methods]The principle,process flow,pyrolysis product formation law,and pilot plant calibration conclusion of CCSI were introduced.The development and test experience of CCSI were summarized comprehen-sively,which provided design basis for the industrial application of CCSI.A high-efficiency clean staged coal utilization technology that couples rapid pyrolysis of raw coal with semi-coke gasification in a single reactor was realized for converting raw coal into crude syngas and coal tar through a one-step method.This technology enables energy complementation and material mutual supply within a special reactor.[Results]The results of pyrolysis pilot plant show that when the reaction temperature is 590-620℃,the reaction pressure is≤1.0 MPa,the reaction atmosphere is simulated syngas,the feed particle size is 300-600 μm,and the residence time is≤1.5 s,the tar yield can be greatly im-proved.CO in the syngas effectively inhibits the inverse conversion reaction of water gas and reduces the formation of pyrolysis water.Considering the structural characteristics of the reactor and the econo-my of pyrolysis,the selection of coal has certain technical requirements.The research on CCSI pilot plant show that,the tar yield of air gasification is 17.12%,the effective gas(CO+H2+hydrocar-bons)content is 35.10%.The tar yield of oxygen gasification is 15.91%,the effective gas(CO+H2+CH4)content is 74.74%,and the carbon conversion rate is 94.27%.The calibration results meet the design requirements.