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Biomass Chemical Engineering ›› 2021, Vol. 55 ›› Issue (1): 56-62.doi: 10.3969/j.issn.1673-5854.2021.01.008

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Self-heating and Self-ignition Characteristics of Crop Straws

Yexuan ZHU, Changdong SHENG()   

  1. School of Energy and Environment, Southeast University, Nanjing 210096, China
  • Received:2019-12-31 Online:2021-01-30 Published:2021-01-25
  • Contact: Changdong SHENG E-mail:c.d.sheng@seu.edu.cn


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.

Key words: straws, thermal safety, self-heating, low temperature oxidation

CLC Number: