State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China.
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China.
Waste Manag. 2023 Sep 1;169:147-156. doi: 10.1016/j.wasman.2023.07.008. Epub 2023 Jul 11.
Rapid infrared heating with fast heating rates and the capacity to load materials on the gram scale help investigate the co-pyrolysis behaviors, minimizing the gap of materials' pyrolysis temperature and volatile release during the co-pyrolysis. This work explored the effects of temperature and heating rate on the co-pyrolysis product s behaviors and synergistic interactions of corn stove and polyethylene. Initial increases in oil yield were followed by decreases when the heating rate rose, and when the temperature increased from 500 °C to 600 °C, the oil yield rose from 17.91 wt% to 20.58 wt% before falling to 14.75 wt% at 800 °C. High heating rate promoted the oil generation, and the maximum oil yield was at 25 °C/s with varying heating rates from 15 °C/s to 35 °C/s. The pyrolysis gas produced at 25 °C/s exhibited the highest LHV (Low heating value) and lowest CO yield, which were 17.23 MJ/nm and 39.29 vol%, respectively. The suitability of heating rate and temperature may improve the interaction between H-radicals of PE and oxygenated groups of CS to generate stable macromolecular compound and enhance oil production. GC-MS studies of the oil products demonstrated that oxygenated compounds such as furans, phenols and acids from lignocellulosic depolymerization had been converted to high molecular weight long chain alcohols (mostly C, C and C alcohols) via stronger interactions during fast infrared-heated co-pyrolysis. The alcohols increased from 32.29 % to 65.06 % as temperatures rose from 500 °C to 800 °C. Few furan heterocycles, acids and phenols were detected, suggesting that the oil presented higher quality and stronger synergistic effects. Rapid infrared heating accelerated the synergistic effects between volatile-volatile interactions during co-pyrolysis of corn stover and polyethylene, and the increases in temperature and heating rates further enhanced the release of many volatile substances and the formation of fine pores. Raman results showed char of 600 °C deposited more pure aromatic structures, the influence of temperature on aromatization was stronger than that of heating rate.
快速红外加热具有快速加热速率和在克级规模上加载材料的能力，有助于研究共热解行为，最大限度地缩小共热解过程中材料热解温度和挥发物释放之间的差距。本工作探讨了温度和加热速率对共热解产物行为的影响以及玉米秸秆和聚乙烯的协同作用。随着加热速率的升高，油产率先增加后减少，当温度从 500°C 升高到 600°C 时，油产率从 17.91wt%增加到 20.58wt%，然后在 800°C 时下降到 14.75wt%。高加热速率促进了油的生成，在 15°C/s 至 35°C/s 的不同加热速率下，最大油产率出现在 25°C/s。25°C/s 下产生的热解气具有最高的低热值（LHV）和最低的 CO 产率，分别为 17.23MJ/Nm 和 39.29vol%。加热速率和温度的适宜性可能会改善 PE 的 H-自由基和 CS 的含氧基团之间的相互作用，生成稳定的高分子化合物并提高产油率。油产物的 GC-MS 研究表明，木质纤维素解聚产生的呋喃、酚类和酸等含氧化合物在快速红外加热共热解过程中通过更强的相互作用转化为高分子量长链醇（主要为 C、C 和 C 醇）。随着温度从 500°C 升高到 800°C，醇的含量从 32.29%增加到 65.06%。检测到的呋喃杂环、酸和酚类化合物很少，表明油的品质更高，协同效应更强。快速红外加热加速了玉米秸秆和聚乙烯共热解过程中挥发物-挥发物相互作用的协同效应，升高温度和加热速率进一步促进了许多挥发性物质的释放和细孔的形成。拉曼结果表明，600°C 的炭沉积了更多纯芳香结构，温度对芳构化的影响强于加热速率。
