수열탄화를 통한 축분의 연료특성 및 소수성 개선 연구 = The Improvement of Fuel Properties and Hydrophobicity of Livestock Manure by the Hydrothermal Carbonization

다국어 초록 (Multilingual Abstract)

In this study, livestock manure was converted into fuel using hydrothermal carbonization, and the chemical composition of the resulting fuel was investigated. The results revealed that the hydrogen and oxygen content of the resulting fuel decreased, whereas the carbon content increased. In addition, there was a reduction in nitrogen content, which could be attributed to the gradual reduction in potential NOx emission, and the decomposition of organic nitrogen under thermal reaction conditions to liquid and gas. Furthermore, the hydrothermal carbonization removed some of the volatile matter in the manure and increased the proportion of fixed carbon content; thus, resulting in an increase in fuel ratio from 0.32 to 0.68 with an increase in the reaction temperature. These results indicated that the calorific value increased after hydrothermal carbonization. However, at hydrothermal carbonization temperatures above 250℃, the formed products exhibited a high ash content of 36.07- 41.54%, which had no effect on the increase in the calorific value. The storage and stability of the biomass fuel was investigated using a moisture reabsorption experiment. There was a sharp decrease in the moisture reabsorption value of the fuel, and only 75% of the raw reabsorption value was retained. This could be attributed to the removal of hydrophilic groups, such as OH (hydroxyl group) and C=O (carboxyl group), from the manure by the hydrothermal carbonization process.

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