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- Title
Hydrothermal carbonization of corncob for hydrochar production and its combustion reactivity in a blast furnace.
- Authors
An, Qi; Wang, Qi; Zhai, Jinpeng
- Abstract
A key factor restricting the application of biochar in the steel industry is its high-quality upgrading. This paper evaluated the characteristics of hydrochar produced by HTC (hydrothermal carbonization) process of corncob to be used as a solid fuel. HTC temperatures (240–300 °C) and HTC water-reused times (1–3 times) were examined for their effects on hydrochar yield, physicochemical characteristics, and combustion properties. The results showed hydrochar yields, O/C, and H/C parameters decreased as HTC temperature and water-reused times increased, while its high heating value increased. Due to dehydration and decarboxylation, hydrochar showed similar characteristics to those in bituminous coal. The removal efficiency of alkali metal K reached 99% after HTC treatment. Carbonaceous hydrochar had become more compact, orderly, and stable with increasing amounts of aromatic functional groups, C = C, and C = O. Hydrochar, as a biofuel, has higher ignition energy and is more stable than corncob due to its high carbonaceous order degree. To calculate combustion kinetic parameters, the Kissinger–Akahira–Sunose (KAS) and Flynn–Wall–Ozawa (FWO) methods were applied. The results revealed that Eα (average activation energy) was quite similar between the two models. HC-300 had an Eα of 262 kJ/mol. HTC could be an efficient way to reutilize corncob biomass into clean biofuels with high calorific value.
- Subjects
HYDROTHERMAL carbonization; CORNCOBS; BLAST furnaces; COMBUSTION; ALKALI metals; BITUMINOUS coal; CARBONIZATION
- Publication
Environmental Science & Pollution Research, 2024, Vol 31, Issue 11, p16653
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-024-32242-z