Method for preparing hydrogen-rich fuel gas by catalyzing biomass tar cracking using aluminum smelting waste residues

A method for preparing hydrogen-rich fuel gas by catalyzing biomass tar cracking using aluminum smelting waste residues, comprising:

• adding aluminum smelting waste residues into an acid selected from nitric acid, phosphoric acid or sulfuric acid and soaking for 2-4 h, filtering and baking an obtained precipitate at 300° C. to 400° C. for 3-6 h to obtain pre-treated aluminum smelting waste residues;
• adding the pre-treated aluminum smelting waste residues into a weak acid and performing ultrasonic treatment to obtain an aluminum ash solution, performing centrifugal separation on the aluminum ash solution, baking the aluminum ash solution for 3-6 h at a constant temperature of 400° C. to 500° C. in an air atmosphere, and naturally cooling the aluminum ash solution to room temperature to obtain a cracking catalyst;
• uniformly mixing the cracking catalyst and biomass with a mass ratio of 1:1 to form a mixture, adding the mixture into a first-stage pyrolyzing furnace under nitrogen atmosphere, and heating from room temperature to 500° C. to 900° C. to obtain first-stage pyrolysis gas;
• and
• entering the first-stage pyrolysis gas into a second-stage pyrolyzing furnace for secondary catalytic cracking, so as to obtain the hydrogen-rich fuel gas.