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Alternative Pathway to Phase Down Coal Power and Achieve Negative Emission in China. | LitMetric

Alternative Pathway to Phase Down Coal Power and Achieve Negative Emission in China.

Environ Sci Technol

State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC), School of Environment, Tsinghua University, Beijing100084, China.

Published: November 2022

AI Article Synopsis

  • The text discusses the challenges of phasing down coal for climate goals while addressing concerns about energy security and social development.
  • Retrofitting coal power plants with biomass and using carbon capture can help reduce emissions significantly, but the exact potential for reduction is still unclear.
  • In China, coal plants could achieve 0.4 Gt of negative CO emissions by 2025 and 10.32 Gt by 2060, but this requires a large amount of biomass and careful timing to maximize benefits.*

Article Abstract

Although widely recognized as the key to climate goals, coal "phase down" has long been argued for its side effects on energy security and social development. Retrofitting coal power units with biomass and coal co-firing with a carbon capture and storage approach provides an alternative way to avoid these side effects and make deep carbon dioxide emission cuts or even achieve negative emission. However, there is a lack of clear answers to how much the maximum emission reduction potential this approach can unlock, which is the key information to promote this technology on a large scale. Here, we focus on helping China's 4536 coal power units make differentiated retrofit choices based on unit-level heterogeneity information and resource spatial matching results. We found that China's coal power units have the potential to achieve 0.4 Gt of negative CO emission in 2025, and the cumulative negative CO emission would reach 10.32 Gt by 2060. To achieve negative CO emission, the biomass resource amount should be 1.65 times the existing agricultural and forestry residues, and the biomass and coal co-firing ratio should exceed 70%. Coal power units should grasp their time window; otherwise, the maximum negative potential would decrease at a rate of 0.35 Gt per year.

Download full-text PDF

Source
http://dx.doi.org/10.1021/acs.est.2c06004DOI Listing

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