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自行设计加工了微波热重实验装置,研究了在微波辐射下菜籽粕热解过程特征及其产物产出规律。在此基础上,对比分析了菜籽粕微波热解与电热热解产物产出率之间的差异。结果发现,在菜籽粕微波热解过程中,半纤维素的反应区间为180~370℃,其转化率可以达到87.0%;纤维素的热解反应区间为370~550℃,其热解转化率32.8%。表明在微波作用下,纤维素的热稳定性远高于半纤维素。在菜籽粕的微波热解过程中,冷凝液的产生主要集中在100~400℃的温度范围内,热解得到的生物质油类主要是菜籽粕的半纤维素热解生成的。不凝气的产生主要集中在300~600℃的温度范围内,并且主要为纤维素与木质素的热解反应产生的。与电热方式相比,菜籽粕的微波热解升温速率较快,菜籽粕微波热解生物质炭的产出率较高,冷凝液产出率相对较低。
The microwave thermo gravimetric experiment device was designed and processed by ourselves. The pyrolysis process of rapeseed meal under microwave irradiation and the law of product output were studied. On this basis, the difference between microwave pyrolysis and electrothermolysis product yield of rapeseed meal was comparatively analyzed. The results showed that during the microwave pyrolysis of rapeseed meal, the reaction range of hemicellulose was 180 ~ 370 ℃, and the conversion rate reached 87.0%. The pyrolysis reaction range of cellulose was 370 ~ 550 ℃, Rate 32.8%. It shows that the thermal stability of cellulose under microwave irradiation is much higher than that of hemicellulose. During the microwave pyrolysis of rapeseed meal, the condensate mainly concentrated in the temperature range of 100-400 ℃. The pyrolysis oil was mainly produced by hemicellulose pyrolysis of rapeseed meal. Non-condensable gas production mainly concentrated in the temperature range of 300 ~ 600 ℃, and mainly cellulose and lignin pyrolysis reaction. Compared with the electric heating method, rapeseed meal microwave pyrolysis heating rate faster, rapeseed meal microwave pyrolysis biomass carbon yield higher, the condensate yield is relatively low.