选取核桃壳炭、玉米秸秆炭与稻壳炭,分别从理化性质、燃烧特性等方面研究其作为传统化石燃料替代品的可能性。研究结果表明,3种生物炭中固定碳占比均高于60%;核桃壳炭、玉米秸秆炭与稻壳炭的平均粒度分别为144.40±0.77、10.58±0.01和18.61±0.01 μm,且都具有发达的孔隙结构,其哈氏可磨性指数依次为47.37±1.22、58.31±1.39和27.19±1.16,可磨性均较差;在10 ℃/min的升温速率下,核桃壳炭、玉米秸秆炭和稻壳炭的综合燃烧特性指数S分别达到1.36×10-11、4.37×10-12和2.34×10-11,当升温速率分别为15和20 ℃/min时,三者的综合燃烧特性指数S均显著提高;核桃壳炭、玉米秸秆炭和稻壳炭的返回火焰长度均小于400 mm,具有弱爆炸性。
Abstract
Walnut shell biochar, corn stalk biochar, and rice husk biochar were selected to examine their potential as a substitute for traditional fossil fuels in terms of physicochemical properties and combustion characteristics. The findings show that all three types of biochar have fixed carbon contents of more than 60%. The three types of biochar are verified to have average particle sizes of 144.40±0.77, 10.58±0.01, and 18.61±0.01 μm for walnut shell biochar, corn stalk biochar, and rice husk biochar, respectively. Meanwhile, their Hardgrove grindability indexes are 47.37±1.22, 58.31±1.39, and 27.19±1.16, respectively, suggesting poor grindability. At a heating rate of 10 ℃/min, the comprehensive combustion characteristic index S of walnut shell biochar, corn stalk biochar, and rice husk biochar are 1.36×10-11, 4.37×10-12 and 2.34×10-11, respectively. When the heating rate is 15 ℃/min and 20 ℃/min, the comprehensive combustion characteristic index S of the above biochar increases significantly. The back flame lengths of walnut shell biochar, corn stalk biochar, and rice husk biochar are all less than 400 mm, indicating weak explosibility.
关键词
生物燃料 /
理化性质 /
燃烧特性 /
核桃壳炭 /
玉米秸秆炭 /
稻壳炭
Key words
biofuels /
physicochemical properties /
combustibility /
walnut shell biochar /
corn stalk biochar /
rice husk biochar
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基金
国家自然科学基金（51904212）; 湖北省国际科技合作计划（2023EHA03）
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