Methods for producing syngas from biomass-co2 coupled converter smelting processes

A method for producing syngas from a biomass-CO2 coupled converter smelting process, comprising:

• initiating smelting in a converter by injecting a primary injection gas while simultaneously injecting a biomass and a carrier gas, wherein the primary injection gas is oxygen (O2) or a mixture of O2 and CO2, injected at 60% of a designed flow rate;
• and the carrier gas is injected at the designed flow rate and includes CO2;
• 5-90 seconds after the smelting begins, increasing an injection flow rate of the primary injection gas from 60% to 100% of the designed flow rate, and keeping injecting the carrier gas at the designed flow rate:
• when an oxygen concentration in the syngas drops to ≤1%, injecting the biomass at the designed flow rate, while maintaining a powder-to-gas ratio of 0.5-1.5 between an injection flow rate of the biomass and an injection flow rate of the carrier gas throughout the smelting;
• in a mid-decarburization period:
• reducing the injection flow rate of the primary injection gas:
• increasing the injection flow rate of the biomass to a maximum value;
• and modulating in real-time the injection flow rate of the carrier gas and the injection flow rate of the biomass;
• after a peak decarburization phase:
• increasing the injection flow rate of the primary injection gas:
• decreasing the injection flow rate of the biomass and the injection flow rate of the carrier gas;
• and
• in a final smelting stage:
• further increasing the injection flow rate of the primary injection gas:
• further decreasing the injection flow rate of the biomass and the injection flow rate of the carrier gas;
• and terminating biomass injection after exceeding 90% of a total smelting duration to obtain the syngas.