Economic approach for CO2 valorization from hydrothermal carbonization gaseous streams via reverse water-gas shift reaction
Journal article, 2022

In this work the economic performance of valorizing the gaseous stream coming from hydrothermal carbonization (HTC) of olive tree pruning is presented as a novel strategy to improve the competitiveness of HTC. The valorization of the commonly disregarded gaseous stream produced in this thermochemical treatment was proposed via the Reverse Water–Gas Shift reaction. This allows to obtain syngas for selling and therefore improving the overall economic performance of the process. To this end, three plant sizes were selected (312.5, 625 and 1250 kg/h of biomass processing). The parameters with a higher share in the total cost distribution along with the revenues from the hydrochar and the syngas selling were further evaluated. The results evidenced that with the assumptions taken, the overall process is still not profitable. To reach profitability, syngas selling prices between 2.2 and 3.4 €/m3 are needed, revealing that this proposal is not economically attractive. Alternatively, a lack of competitiveness in the current market is revealed with hydrochar selling prices between 0.41 and 0.64 €/kg to make the project profitable. The catalyst cost, sharing approximately 20% of the total cost, is the parameter with the highest impact in the total economics of the process. The second one is the hydrogen price production, representing almost 16% of the total. Investment subsidies are also examined as a potential tool to cover part of the initial investment. These results evidenced that further efforts and measures are needed to push forward in the path towards circular economy societies.

Profitability analysis

Reverse water gas shift

CO waste valorization 2

Hydrothermal carbonization

Author

Judith González-Arias

Brandenburg University of Technology

Universidad de Leon

Francisco Baena-Moreno

Chalmers, Space, Earth and Environment, Energy Technology

University of Seville

Miriam González-Castaño

Brandenburg University of Technology

Harvey Arellano-García

Brandenburg University of Technology

Fuel

0016-2361 (ISSN)

Vol. 313 123055

Subject Categories

Chemical Process Engineering

Bioenergy

Energy Systems

DOI

10.1016/j.fuel.2021.123055

More information

Latest update

4/8/2022 1