To understand the risk factors of spontaneous combustion fire during the storage process of a biomass pile, the effects of various factors on its self-ignition process under adiabatic oxidation conditions were investigated. Thermogravimetry, differential scanning calorimetry, and Fourier transform infrared spectroscopy (FTIR) were used to analyze the behavior of a series of biomass samples before and after the inhibition. A total of 12 typical inorganic salts and antioxidants were used as chemical inhibitors for suppressing the spontaneous combustion of the lignocellulosic biomass. A steady increase in the heating rate of the compound can be observed with a decrease in the particle size from 4.00 to 0.18 mm. Samples with a moisture content of 1% are most susceptible to spontaneous combustion. Interestingly, the effect of the ventilation rate on the self-heating properties of the samples increases when the temperature is higher than 70 °C. In the 40–350 °C range, CaCl₂, citric acid, MgCl₂, and Na₃PO₄ reduce the heat release by 123.32–492.15 J/g. Among these compounds, CaCl₂ exhibits the optimal inhibition effect. According to the FTIR results, the inhibitors mainly target the −OH, C–O, C–H, and C═O groups. Moreover, the weakening of these active sites by slowing their oxidation rate is the main responsible for retarding the spontaneous combustion of the biomass. This work contributes in the development of novel strategies to shed some light on the spontaneous combustion of biomasses.

中文翻译：

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木质纤维素生物质自燃及其化学抑制剂抑制作用的室内研究

为了了解生物质堆在储存过程中自燃的危险因素，研究了在绝热氧化条件下各种因素对其自燃过程的影响。热重分析，差示扫描量热法和傅立叶变换红外光谱（FTIR）用于分析抑制前后一系列生物量样品的行为。总共使用了12种典型的无机盐和抗氧化剂作为化学抑制剂，以抑制木质纤维素生物质的自燃。可以观察到化合物的加热速率稳定增加，而粒径从4.00减小到0.18mm。水分含量为1％的样品最容易自燃。有趣的是 当温度高于70°C时，通风速率对样品自热性能的影响会增加。在40–350°C范围内，CaCl_{如图2所示}，柠檬酸，MgCl ₂和Na ₃ PO ₄将热量释放降低了123.32–492.15 J / g。在这些化合物中，CaCl ₂表现出最佳的抑制作用。根据FTIR结果，抑制剂主要针对-OH，C-O，CH-H和C = O基团。而且，通过减慢其活性速率来减弱这些活性位点是阻碍生物质自燃的主要原因。这项工作有助于开发新的策略，以阐明生物质的自燃。