The invention discloses a method for preparing
hydrogen-rich gas by catalyzing
biomass tar cracking through aluminum
smelting waste residues, which comprises the following steps: adding the aluminum
smelting waste residues into medium strong acid, soaking for 2-4 hours, filtering, and baking the obtained precipitate at 300-400 DEG C for 3-6 hours to obtain pretreated aluminum
smelting waste residues; adding the pretreated aluminum smelting waste residues into weak acid, performing ultrasonic treatment, performing
centrifugal separation on an aluminum ash solution, baking for 3-6 hours at the constant temperature of 400-500 DEG C in an
air atmosphere, and naturally cooling to
room temperature to obtain a
cracking catalyst; the method comprises the following steps: uniformly mixing a
cracking catalyst and
biomass according to a
mass ratio of 1: 1, adding the mixture into a first-stage pyrolyzing furnace in an N2
atmosphere, and heating from
room temperature to 500-900 DEG C to obtain first-stage pyrolyzing gas; and the first-stage
pyrolysis gas enters a second-stage
pyrolysis furnace for secondary catalytic cracking, and
hydrogen-rich gas is obtained. According to the method, the
hydrogen yield can be effectively increased by 200% or above, the
tar yield is effectively reduced, the liquid yield is controlled to be 11% or below, and heavy components in the
tar are greatly reduced.