PET和关中麦秆共热解特性及其动力学研究

doi:10.3969/j.issn.1673-5854.2021.05.001

Abstract

Abstract:

Pyrolytic behaviors, main pyrolytic products, synergistic effect and kinetics of Guanzhong wheat straw, polyethylene Terephthalate(PET) sample and its blends(mass ratio 1:1) were investigated by TG-FTIR system at heating rate of 20 K/min. The results demonstrated that the initial pyrolysis temperature of PET sample was 375℃ and the maximum weight loss rate(62.87%) occured at the temperature of 454.9℃ and the residual amount was about 19.42%.The weight loss rates of the mixture were 22.9% and 73.9% at the two weight loss peak(339.9 and 444℃), respectively. At that time, the final prolysis residual amount was about 23.52%. There were two synergistic effects(339.9 and 444℃) in the process of co-pyrolysis which enhanced the amount of pyrolysis products of CO, CH₄, aromatics, acids, ketones, aldehydes, alcohols, alkanes, phenols and ethers. The heating value and fuel quality of the raw material were enhanced a lot by the co-pyrolysis process. The apparent activation energy of PET in higher than that of wheat straw(86.5 kJ/mol). And the apparent activation energies of the mixture calculated by Coats-Redfern method were 53.6 kJ/mol at low pyrolysis temperature region(258-363℃) and 81.6 kJ/mol at the high pyrolysis temperature region(393-463℃).

Key words: Guanzhong wheat straw, co-pyrolysis, synergistic effect, TG-FTIR, pyrolysis kinetics

CLC Number:

TQ35
TK62

Bingtao HU, Zhijian LI. Co-pyrolysis Characteristics and Kinetics of PET and Wheat Straw[J]. Biomass Chemical Engineering, 2021, 55(5): 1-7.

Figures/Tables 7

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References 21

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原料 raw material	工业分析proximate analysis/%				元素分析ultimate analysis/%					低位热值/ (MJ·kg^-1) low heating value
原料 raw material	水分moisture	灰分ash	挥发分volatile	固定碳fixed carbon	C	H	O^*	N	S	低位热值/ (MJ·kg^-1) low heating value
麦秆wheat straw	7.06	3.65	74.58	14.71	43.94	5.59	49.73	0.60	0.15	12.67
PET	—	0.04	95.79	4.17	65.15	4.14	30.70	—	—	22.50

试样sample	CO	CH₄	含C=O类化合物 compounds containing C=O bond	酯类和烷烃类化合物esters and alkanes	H₂O(吸附水absorbed water)	CO₂
麦秆wheat straw	0.000255	0.001490	0.001155	0.000815	0.000795	0.015740
PET	0.003125	0.006300	0.044740	0.011050	0.012350	0.039200
麦秆-PET WS-PET	0.006550	0.010110	0.063930	0.012490	0.011520	0.043350

试样sample	β/(K·min^-1)	主反应温度/℃ main pyrolysis temperature	α/%	E/(kJ·mol^-1)	A/min^-1	R²
麦秆wheat straw	20	222~377	5.4~84.7	86.5	7.6×10⁵	0.983
PET	20	415~465	1.6~79.9	355.48	4.34×10²⁵	0.975
麦秆-PET WS-PET	20	258~363	5.3~39.9	53.6	4.3×10³	0.997
		393~463	43.5~86.9	81.6	4.18×10⁵	0.975

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Co-pyrolysis Characteristics and Kinetics of PET and Wheat Straw

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