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The prototype and a new design of modular biochar torrefaction system were devised here, as a spin-off from "2010 Project on the Promotion of Green Community in Chiayi County" in Taiwan. Results from the batch tests using the prototype confirmed that the ratio of biochar to fuel in terms of CO2eq is greater than 1.0 for densely-packed materials such as camper wood (Cinnamomum camphora (L...