Abstract:

Biomass energy is a globally recognized renewable energy with zero carbon properties, but its carbon reduction benefits have not been effectively reflected. Based on the whole life cycle evaluation (LCA) method, combined with the economic benefit evaluation method and the environmental impact monetization method, this study built a EGE model for the greenhouse gas emission reduction benefit evaluation (EGE) of straw pyrolysis polygeneration technology. The EGE model took the whole chain of straw collection, off-field storage and transportation, pyrolysis transformation and product utilization as the boundary. The comprehensive economic and environmental benefits of different pyrolysis polygeneration technologies under different production scales was explored. The results showed that the external heating pyrolysis carbon gas co-production technology has the best economic benefits in large-scale application, and at the annual production scale of 0.5×10⁴ ~ 10×10⁴t of straw, each 1t of straw consumption can reduce 1.01−1.07tCO₂eq. Greenhouse gas emission reduction could significantly improve the economic benefits of straw pyrolysis polygeneration technology projects, and each 1t of straw consumption could increase the benefit of 57.5−103.1 yuan, which increased the yield rate of straw pyrolysis polygeneration technology projects by 1.6−14.0PP. It is estimated that the utilization potential of straw in 2030 and 2060 would reach 1.24×10⁸t and 1.67×10⁸t respectively, and the emission reduction income of straw pyrolysis polygeneration technology can reach 1.0×10¹⁰−3.7×10¹⁰ yuan. The results of this study provide technical support for the development of biomass energy industry under the background of realizing the dual-carbon goal.

Key words: Straw, Pyrolysis polygeneration technology, Greenhouse gases, Monetization of emission reduction benefits, Life cycle assessment, Economic evaluation