Abstract Co-pyrolysis characteristics of cornstalk with two types of coal (lignite, bituminous coal) were investigated using thermogravimetry coupled with Fourier transform infrared spectrometry (TG-FTIR). Pyrolysis thermal behaviors of biomass and coal samples and their blends in different blending ratios were revealed by TG and DTG profiles, and an online monitoring of gas products evolved was realized by FTIR measurement. In order to explore potential synergistic effect, characteristic values of TG and DTG curves were identified for all blended and parent samples. In the meantime, evolution characteristics of CO2, CO, CH4, H2O and formic acid were identified by FTIR profiles against temperature. Slight synergistic effects were approved by both TG and FTIR analysis, which resulted in higher char yields and influences on volatile evolution during co-pyrolysis. 0.3∼7.4 % higher final residual yields than expected were confirmed in co-pyrolysis. TG results showed that thermal behavior of biomass was remarkably influenced with the presence of coal in blended samples at 286–306 °C. FTIR profiles also indicated that the evolution of formic acid was affected according to the releasing characteristics of C O and C–O groups at the same temperature region. SEM images and BET analysis of residual char provided further information about synergy. Disparity of thermal behaviors and void spaces between parent biomass and coal brought favorable conditions for adsorption and coking of both biomass and coal volatiles, which led to different gas-solid interactions and significantly changed the surface morphology and porous structure of co-pyrolyzed char particles.

中文翻译：

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木质纤维素生物质与煤共热解过程中的热行为和析气特征：TG-FTIR 研究

摘要 采用热重结合傅里叶变换红外光谱（TG-FTIR）研究了玉米秸秆与两种煤（褐煤、烟煤）的共热解特性。TG和DTG剖面揭示了生物质和煤样品及其混合物在不同混合比例下的热解热行为，并通过FTIR测量实现了对气体产物的在线监测。为了探索潜在的协同效应，确定了所有混合样品和母体样品的 TG 和 DTG 曲线的特征值。同时，通过 FTIR 谱图对温度的变化确定了 CO2、CO、CH4、H2O 和甲酸的演化特征。TG 和 FTIR 分析均批准了轻微的协同作用，这导致更高的炭产率和对共热解过程中挥发物的影响。在共热解中证实最终残余产率比预期高 0.3~7.4%。TG 结果表明，在 286-306 °C 下，混合样品中煤的存在显着影响了生物质的热行为。FTIR 谱图还表明，甲酸的演化受 CO 和 C-O 基团在同一温度区域的释放特征的影响。残留炭的 SEM 图像和 BET 分析提供了关于协同作用的进一步信息。母体生物质和煤之间的热行为和空隙空间的差异为生物质和煤挥发物的吸附和焦化带来了有利条件，