Journal of Cleaner Production 229, 1183-1188.
The renewable battery concept via conversion of agricultural waste into biocoal using frictional pyrolysis
Vakalis, S., Moustakas, K., Heimann, R., Loizidou, M.
The rapid growth of wind and solar power production installations worldwide has not been coupled with similar rates of integration in the electrical grid. This study proposes the conversion of agricultural residues into biocoal by means of frictional pyrolysis, which is a novel power-to-fuel technology that converts directly electricity into mechanical work and uses no additional heat. The excess renewable energy, that otherwise would be lost, will be utilized for converting agricultural residues into biocoal. This novel concept is defined as the concept of the renewable battery. A case study is presented for the State of California and three characteristic biomass types have been analyzed and converted into biocoal. The analysis showed that, between the years 2007–2016, the wind power installations have increased by 242.37% and the majority of solar PV were installed which account for 17,238 GWh. From the initial energy input of the biomass, the energy that was converted and stored in the form of biocoal ranged from 78.6% to 86.8%. The concept of renewable battery promotes carbon sequestration in agricultural practices and serves as a cleaner and renewable fuel that can be co-combusted with coal.