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    • 9. 发明授权
    • Method of biomass grading pyrolysis gasification in a circulating fluidized bed
    • US10787620B2
    • 2020-09-29
    • US16293314
    • 2019-03-05
    • China University of Petroleum (East China)
    • Yingyun QiaoYuanyu TianYouqing WuHuawei ZhangPeijie ZongJie LiXue MingYuan Jiang
    • C10J3/54C10J3/56C10J3/84C10J3/66
    • The invention provides a method of biomass grading pyrolysis gasification in a circulating fluidized bed comprising: feeding biomass into the lower-middle part of a carrying fluidized bed, mixing with high temperature synthesis gas and heat carrier from a turbulent fluidized bed, heating the biomass to carry out a pyrolysis reaction, and carrying the pyrolysis product upward; subjecting the cracked oil and gas to a gaseous phase catalytic cracking in an upper-middle part of the carrying fluidized bed, cracking the tar into methane, ethane and the like; subjecting the heat carrier, semi-coke and fuel gas after the reaction to the multi-stage of gas-solid separation, a large particle carrier and semi-coke following a first-level separation are used as the fuel gas cracking catalyst and the filter material for filtering and removing dust, and enter into a moving bed filter to separate out an ultra-fine ash and subsequently return to the turbulent fluidized bed so as to perform gasification reaction, the ultra-fine ash is delivered to the outside as a silicon-potash fertilizer product; the medium and small particle carrier and semi-coke separated from a second-level separation are directly recycled to the turbulent fluidized bed, the fine particles separated from a third-level separation is discharged to the outside as a silicon-potash fertilizer product, the moving bed filter further catalytically cracks a small amount of tar in the fuel gas into methane and ethane and removes the ultra-fine ash simultaneously, the purified fuel gas is delivered to the outside as a product.