采用自行设计的杜瓦瓶绝热自加热反应装置，对稻草在室温条件下储存时的自加热过程进行研究，并比较样品水分（50%、60%和70%，以干基表示）和颗粒尺寸（2 mm和0.2 mm）的影响。结果表明，保持颗粒尺寸一定，稻草水分含量越高，样品内部自加热越明显；保持水分含量一定，颗粒尺寸越小（0.2 mm），样品内部产热量越多，自加热现象越明显。反应前后样品水分、灰分、pH值的增大及发热量的变化表明自加热导致明显的热、质损失，因此合理控制稻草等秸秆类生物质燃料在储存时的水分含量和颗粒尺寸对防范自加热至关重要。
关键词：
生物质; 稻草; 自加热; 水分; 粒径
In the laboratory scale, a dewar flask heat insulation equipment was designed to conduct the self-heating experiment of rice straw at room temperature, and the influence of the moisture (50%, 60% and 70%, expressed as dry basis) and particle size (≤ 2 mm and 0.2 mm) were studied. The results indicated that the internal temperature of the sample increased with the moisture content, while decreased with the particle size. The increase of moisture, ash content, pH value and the change of calorific value reflected that self-heating led to obvious losses of heat and mass. Therefore controlling the moisture content and particle size reasonably is crucial to prevent the occurrence of self-heating.
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