豆腐废水对芦苇秆水热焦特性的影响

EFFECT OF BEAN CURD WASTEWATER ON CHARACTERISTICS OF REED STALK HYDROCHAR

为寻求生物质水热碳化处理技术的替代溶剂,以豆腐废水为溶剂,芦苇秆为原料,在190~270℃、60 min条件下进行水热碳化实验研究,参照纯水溶剂,深入分析2种溶剂中水热焦的组成和燃料特性。结果表明:随着反应温度的升高,在豆腐废水作用下,水热焦产率从84.6%减至52.4%,比纯水溶剂中水热焦产率高11%~17%;而碳质量分数从51.51%增至69.41%,同纯水溶剂相比,整个实验温度范围内,豆腐废水溶剂中水热焦碳质量分数较高而O/C原子比较低,至250℃时,高位热值和能量密度分别达27.6 MJ/kg和1.72,燃料比为092,H/C和O/C原子比进入褐煤区域,豆腐废水可促进芦苇秆的脱羧反应,提高水热焦的燃料特性。

The hydrothermal carbonation experiments were carried out at 190-270℃ for 60 min by using reed stalk as a raw material,pure water and bean curd wastewater as solvent.The composition and fuel characteristics of hydrochar with two kinds of hydrothermal solvent were analyzed thoroughly.The results show that with the increasing of temperature,the yield of hydrochar decreases from 84.6% to 52.4% with the bean curd wastewater solvent.However,the yields are about 11%-17% higher than those obtained with the pure water solvent under the same condition.The carbon content of hydrochar increases from 51.51% to 69.41% with the bean curd wastewater solvent.Compared with the pure water solvent,the carbon content of hydrochar is higher while the O/C atom ratio is lower within the whole experimental temperature range.At 250℃,the higher heating value and energy densification of hydrochar is up to 27.6 MJ/kg and 1.72 respectively,and the fuel ratio is 0.92.Moreover,the atomic ratios of H/C and O/C enter the lignite area.The bean curd wastewater promotes the hydrothermal decarboxylation reaction of reed stalk and enhances the fuel properties of hydrochar.