Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China.
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Bioresour Technol. 2017 Nov;244(Pt 1):125-131. doi: 10.1016/j.biortech.2017.07.128. Epub 2017 Jul 24.
With the aim to support the experimental tests in a circulating fluidized bed pilot plant, the pyrolysis processes of coal, corn, and coal-corn blend have been studied with an online pyrolysis photoionization time-of-flight mass spectrometry (Py-PI-TOFMS). The mass spectra at different temperatures (300-800°C) as well as time-evolved profiles of selected species were measured. The pyrolysis products such as alkanes, alkenes, phenols, aromatics, as well as nitrogen- and sulfur-containing species were detected. As temperature rises, the relative ion intensities of high molecular weight products tend to decrease, while those of aromatics increase significantly. During the co-pyrolysis, coal can promote the reaction temperature of cellulose in corn. Time-evolved profiles demonstrate that coal can affect pyrolysis rate of cellulose, hemicellulose, and lignin of corn in blend. This work shows that Py-PI-TOFMS is a powerful approach to permit a better understanding of the mechanisms underlying the co-pyrolysis of coal and biomass.
为了支持循环流化床中试工厂的实验测试，使用在线热解光致电离飞行时间质谱仪（Py-PI-TOFMS）研究了煤、玉米和煤-玉米混合物的热解过程。测量了不同温度（300-800°C）下的质谱以及选定物种的时变分布。检测到了烷烃、烯烃、酚类、芳烃以及含氮和含硫物种等热解产物。随着温度的升高，高分子量产物的相对离子强度趋于降低，而芳烃的相对离子强度显著增加。在共热解过程中，煤可以促进玉米中纤维素的反应温度。时变分布表明，煤可以影响玉米中纤维素、半纤维素和木质素的热解速率。这项工作表明，Py-PI-TOFMS 是一种强大的方法，可以更好地理解煤和生物质共热解的机制。
