Abstract
The production of novel solid fuel (bio-coal) with its physicochemical quality similar to coal was investigated in the vacuum distillation of pyrolysis bio-oil from agricultural waste like straw as the raw material. The effect of distillation temperature and pressure on the yield of bio-coal and distillates during the vacuum distillation process was focused, as well as the elemental analysis, microscopic morphology, calorific value and combustion performance of bio-coal samples. The yield of bio-coal was up to 45.01 wt% in the vacuum distillation. The carbon content in bio-coal reached 70.93% with its fuel ratio of 1.14, and calorific value of 29.05 MJ/kg. Thermogravimetric analysis revealed that the initiation temperature of the bio-coal obtained at higher distillation temperature and lower distillation pressure was significantly lower, and they presented better overall combustion effects with higher combustibility index and complete combustion characteristics index. Taking the available waste straw each year as the raw material, the total output of bio-coal in the vacuum distillation process is comparable to 330 million tons of standard coal, accounting for 11.67% of China's annual coal consumption. This study proposes a novel way for optimizing China's present energy structure, reducing agricultural waste pollution, and finally achieving energy sustainability.
Published Version
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