CO2 negative emission poly-generation system and method for catalyzing biomass pyrolysis through calcium oxide

A CO2 negative emission poly-generation system for biomass pyrolysis catalyzed by calcium oxide comprises a biomass pyrolysis unit used for generating modulated pyrolysis gas, high-concentration high-temperature CO2 flue gas and biochar; the gas treatment and purification unit is used for purifying the pyrolysis gas and the high-concentration and high-temperature CO2 flue gas, recovering heat in the pyrolysis gas and the high-concentration and high-temperature CO2 flue gas, providing pure CO2 for the pyrolysis unit, externally providing a CO2 product and providing pyrolysis synthesis gas for the poly-generation unit; the poly-generation unit is used for producing high-value chemicals, activated carbon, heat energy and electric power; the biomass pyrolysis unit is connected with the gas treatment and purification unit, the gas treatment and purification unit is connected with the poly-generation unit, and the poly-generation unit is simultaneously connected with the biomass pyrolysis unit and the gas treatment