秸秆类生物质成型燃料氧化过程特性

Characteristics of oxygen process of straw biomass briquette

对玉米秸秆颗粒在不同升温速率和不同氧体积分数下进行热重实验和对照实验,了解外界因素对玉米秸杆颗粒表观质量增加的影响程度以及分析颗粒质量增加的主要原因,同时对不同升温速率和不同氧体积分数下玉米秸秆颗粒氧化反应特征温度的变化规律进行分析。研究结果表明:生物质颗粒与氧的吸附作用是导致颗粒质量增加的主导因素;随着升温速率的增大,玉米秸秆颗粒氧化反应总区间延长,干燥峰值温度θ1、临界温度θ2、着火温度θ4和最大质量损失峰值温度θ5逐渐增大,吸附峰值温度θ3逐渐减小;随着氧体积分数的提高,玉米秸秆颗粒氧化反应总区间缩短,干燥峰值温度θ1保持不变,临界温度θ2先降低再保持不变,吸附峰值温度θ3先降低再上升,着火温度θ4和最大质量损失峰峰值温度θ5随氧体积分数的增加而降低。

Thermo gravimetric experiments and contrast experiments were conducted on corn stalks under different heat rates and volume fractions of oxygen. The reason for particle weight gain of corn stalks was analyzed, and the oxidation characteristic temperatures of biomass briquette were explored with different heat rates and volume fractions of oxygen. The results show that the adsorption of oxygen by biomass is the main cause of the weight gain of particle. As the heat rate increases, the corn stalks oxidation region extends, drying peak temperature θ1, critical temperature θ2, burn-out temperature θ4 and maximum weight loss peak temperature θ5 increase, and at the same time absorption peak temperature θ3 decreases. As the oxygen fraction increases, the corn stalks oxidation region was shortened, drying peak temperature θ1remains unchanged, critical temperature θ2 decreases firstly and then remains unchanged, absorption peak temperature θ3decreases firstly and then increases, and burn-out temperature θ4 and maximum weight loss peak temperature θ5 decrease.