以水稻秆和玉米秆为原料,开展不同K2CO3浓度和保温时间下的水热炭化试验,研究秸秆水热炭和液体产物的理化特性。结果表明,随着K2CO3浓度的增大和保温时间的增加,水热炭产率从35.65%降至22.86%,气体产率从4.68%增至13.03%;液体产物的产率、pH值、电导率、NH4+-N浓度增大,PO43--P浓度减小;水热炭的灰分、固定碳、C、N和高位热值增大,挥发分、H、O和能量转化率减小。K2CO3浓度为10%、保温时间为120 min时,水热炭的含氧官能团和孔隙结构最丰富,最大比表面积和总孔体积分别为9.5321 m2/g和0.0724 cm3/g。
Abstract
The hydrothermal carbonization of rice straw and corn stover is carried out under different K2CO3 concentrations and holding time, and the physicochemical properties of the hydrochars and liquid products are investigated. The results show that with increasing K2CO3 concentration and holding time, the hydrochar yield decreases from 35.65% to 22.86%, while the gas yield increases from 4.68% to 13.03%. Besides, the liquid products show increases in yield, pH value, electrical conductivity and NH4+-N concentration, while decreases in PO43--P concentration. With increasing K2CO3 concentration and holding time, the hydrochars show higher ash, fixed carbon, C, N content and higher heating value, while lower volatile matter, H, O content and energy conversion efficiency. When the K2CO3 concentration is 10% and the holding time is 120 min, the obtained hydrochars have abundant oxygen-containing functional groups and optimal pore structure, with the maximum specific surface area and total pore volume of 9.5321 m2/g and 0.0724 cm3/g, respectively.
关键词
生物质能 /
催化剂 /
碳酸钾 /
理化特性 /
秸秆 /
水热
Key words
biomass energy /
catalysts /
potash /
physicochemical properties /
straw /
hydrothermal
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基金
国家自然科学基金（31701310）; 中央高校基本科研业务费专项（2662020GXPY013; 2662020GXPY014）
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