豆类秸秆两级热解特性研究

利用热裂解仪-气相色谱/质谱联用仪(Py-GC/MS)对黄豆秆进行了两级热解。结果表明,随着第一级热解温度(t1)的升高,第一级热解产物总峰面积逐渐增大,第二级热解产物总峰面积逐渐减小;在第一级热解产物中,酸类、酮类和呋喃类等源于纤维素和半纤维素的产物含量在t1为400和450℃时较高;在t1为450和500℃的条件下,第二级热解产物中烃类产物的含量高达20%以上。两级热解可以在第一级和第二级热解中分别获取不同的高含量产物,如乙酸、糠醛、愈创木酚、甲苯和苯等,实现生物质的选择性热解。

Two-step pyrolysis characteristics of bean stalks

Two-step pyrolysis of soybean stalk was investigated using pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The results indicate that with the increase of the first-step pyrolysis temperature (t₁), the total peak area of the first-step products becomes higher. However, for the second-step, the total peak area decreases gradually with the increase of t₁. The products in the first-step pyrolysis have higher contents of acids, ketones and furans when t₁ is 400 or 450 ℃. This is because that the products are originated from cellulose and hemicellulose. The content of hydrocarbon products in the second-step is more than 20% when t₁ is 450 or 500 ℃. With two-step pyrolysis some products with high content can be obtained in the first or second step, respectively, such as acetic acid, furfural, guaiacol, methylbenzene and benzene etc., thus preliminarily achieving the selective pyrolysis of biomass.