秸秆的自加热及自燃特性研究

doi:10.3969/j.issn.1673-5854.2021.01.008

Abstract

Abstract:

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:

TQ35

Yexuan ZHU, Changdong SHENG. Self-heating and Self-ignition Characteristics of Crop Straws[J]. Biomass Chemical Engineering, 2021, 55(1): 56-62.

Figures/Tables 9

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References 18

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样品 sample	工业分析proximate analysis¹⁾/%				元素分析elemental analysis²⁾/%					低位热值/(kJ·kg^-1) low calorific value
样品 sample	水分 moisture	灰分 ash	挥发分 volatile matter	固定碳 fixed carbon	C	H	O	N	S	低位热值/(kJ·kg^-1) low calorific value
稻草rice straw	10.26	9.14	67.76	12.84	40.67	5.27	41.79	1.07	0.42	17636
麦秸wheat straw	8.71	7.91	65.28	18.1	42.87	5.29	42.13	0.61	0.36	18532
玉米秸秆corn stalk	10.14	6.05	69.8	14.01	44.06	5.62	41.79	1.07	0.42	17746

样品 sample	含水量/% moisture	T_K5/℃	T_K7/℃	ΔT_max/℃
稻草 rice straw	40	41.14	28.88	12.26
	50	42.57	28.54	14.03
	60	44.75	30.58	14.17
	70	46.03	30.48	15.55
麦秸 wheat straw	40	34.42	27.42	7.00
	50	35.12	27.32	7.80
	60	38.69	28.49	10.20
	70	39.75	29.35	10.40
玉米秸秆 corn stalk	40	31.92	27.84	4.08
	50	36.05	26.32	9.73
	60	40.70	28.68	12.02
	70	43.67	28.27	15.40

样品 sample	着火温度(T_IC)/℃ ignition temp.	特征温度(T)/℃ characteristic temp.	空气氧化特征温度(T_MWL)/℃ characteristic temp. of air oxidation
稻草rice straw	217	228	278
麦秸wheat straw	222	232	278
玉米秸秆corn stalk	213	225	278

样品 sample	热解pyrolysis		空气氧化air oxidation		纯氧化oxidation
样品 sample	E_a/(kJ·mol^-1)	A/min^-1	E_a/(kJ·mol^-1)	A/min^-1	E_a/(kJ·mol^-1)	A/min^-1
稻草rice straw	72.53	84120	77.86	855978	70.90	82454
麦秸wheat straw	101.26	183917896	89.35	15401878	95.83	23676653
玉米秸秆corn stalk	92.33	224134	78.45	686938	78.08	420837

Self-heating and Self-ignition Characteristics of Crop Straws

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