秸秆的自加热及自燃特性研究

针对秸秆堆积储存和制粉过程中的自燃问题,采用杜瓦瓶自加热装置对稻草(RS)、麦秸(WS)、玉米秸秆(CS)堆积储存的自加热过程进行研究,并考察含水量对自加热的影响;同时,采用慢速升温的热重分析方法对3种秸秆的低温氧化特性进行研究.自加热实验结果显示:3种秸秆的自加热过程遵循相同的规律(均分为诱导期、温度上升期和温度下降...

Self-heating and Self-ignition Characteristics of Crop Straws

To investigate self-ignition of crop straws in storage and pulverization, the self-heating process of storing rice straw(RS), wheat straw(WS) and corn stalk(CS) were carried out in Dewar device and the effect of moisture content was studied. Meanwhile, thermogravimetric analysis with slow heating rate were conducted to study the characteristics and kinetics of low temperature oxidation of three kinds of straw. The results of Dewar experiments showed that the self-heating process of crop straws followed the same pattern, which was divied into three stages including induction period, temperature rising period and stable period of temperature dropping, and the higher the moisture content was, the stronger the self-heating propensity was. Moreover, rice straw had the strongest self-heating capability and wheat straw had the weakest capability. Low temperature oxidation experiments showed that, compared with wheat straw, rice straw and corn stalk had stronger low temperature oxidation, pyrolysis activity and higher self-ignition risk in pulverization. In conclusion, rice straw and corn stalk were evaluated to have higher self-heating and self-ignition risks in storage and pulverization.