- 期刊
升溫速率對木材慢速熱解產物基本性質之影響
Effects of Heating Rate on the Fundamental Properties of Slow Pyrolysis Products from Wood
摘要
本研究係利用慢速熱解法（slow pyrolysis method）將柳杉（Cryptomeria japonica）與相思樹（Acaciaconfusa）裁切成2 × 2 × 10 cm，以固定床式機械窯在不同升溫速率（75、100及150℃/hr）下，將試料加熱至500℃並持溫1hr，探討升溫速率對熱解產物木炭與木醋液基本性質之影響。試驗結果發現，柳杉及相思樹木炭之收率均以升溫速率100℃/hr者最高；在相同升溫速率下，柳杉木炭之孔隙度高於相思樹者，但酸鹼值則以相思樹者較高；又柳杉木炭之碳元素含量隨升溫速率之增加而提高，相思樹木炭者則相反；在熱值方面，柳杉及相思樹木炭之熱值均以升溫速率150℃/hr者為最高。柳杉木醋液之收率隨升溫速率之升高而降低，但相思樹者則相反；兩種木醋液均以升溫速率100℃/hr者有較高的pH值及有機酸含量；又木醋液之有機成分中，兩種木醋液中之酸性物質均以醋酸、丙酸及丁酸之含量為主，又柳杉木醋液之酚類物質含有多量2-甲氧基酚（2-methoxy-phenol），而相思樹木醋液則含多量的2，6-二甲氧基酚（2，6-dimethoxy-phenol)，而中性物質主要以1，2-benzenediol衍生物與環己戊烯酮（cyclopentanone）衍生物為主，升溫速率100℃/hr時，不論柳杉或相思樹木醋液均有糠醛（furfural）產生。
並列摘要
In this study, the influence of heating rates (75,100 and 150℃/hr) on the fundamental properties of wood charcoals and vinegars were examined. The slow pyrolysis of Cryptomeria japonica and Acacia confusa with the size of 2 × 2 × 10 cm was conducted by using steel kiln at the different heating rates, pyrolysis temperature of 500℃, and holding time of 1 hr, respectively. The results showed that both woods with heating rate of 100℃/hr had the highest yields of wood charcoals. At the same heating rate, the porosity of C. japonica charcoal was higher than that of A. confusa, while the pH value was in the reverse trend. In addition, the elemental carbon content of C. japonica charcoal increased with the increasing heating rate, but the A. confusa charcoal was with the reverse trend. The yield of C. japonica vinegar increased with the increasing heating rate, but the reverse results of A. confusa vinegar was obtained. The heating rate of 100℃/hr had the highest pH value as well as organic content of both wood vinegars. The organic components of wood vinegars were divided into three fractions i. e. acidic, phenolic, and neutral compounds. The acetic acid, propanoic acid and butanoic acid of acidic compounds for both wood vinegars, 2-methoxy-phenol of phenolic compounds for C. japonica and in addition of 2,6-dimethoxy-phenol for A. confusa vinegar, and 1,2-benzenediol and its derivatives of neutral compounds for both wood vinegars were the main components of each fraction. Furthermore, the furfural was obtained at the heating rate of 100℃℃/hr for both wood vinegars.