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

生物质化学工程 ›› 2021, Vol. 55 ›› Issue (5): 1-7.doi: 10.3969/j.issn.1673-5854.2021.05.001

PET和关中麦秆共热解特性及其动力学研究

胡炳涛¹, 李志健²^,³^,*()

1. 西安交通大学人居环境与建筑工程学院, 陕西西安 710049
2. 陕西科技大学轻工科学与工程学院, 陕西西安 710021
3. 陕西省造纸技术与特种纸品开发重点实验室, 陕西西安 710021

收稿日期:2020-09-29 出版日期:2021-09-30 发布日期:2021-09-13
通讯作者: 李志健 E-mail:lizj@sust.edu.cn
作者简介:李志健, 教授, 博士生导师, 研究领域为植物纤维能源化; E-mail: lizj@sust.edu.cn
胡炳涛(1992-), 男, 甘肃庆阳人, 博士生, 主要从事环境多相流及生物质热化学转化方向的研究
基金资助:
陕西省造纸技术与特种纸品开发重点实验室项目(14JS011)

Co-pyrolysis Characteristics and Kinetics of PET and Wheat Straw

Bingtao HU¹, Zhijian LI²^,³^,*()

1. School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China
2. College of Bioresources Chemical and Materials Enginerring, Shaanxi University of Science & Technology, Xi'an 710021, China
3. Key Laboratory of Paper Technology and Specialty Paper Development of Shaanxi Province, Xi'an 710021, China

Received:2020-09-29 Online:2021-09-30 Published:2021-09-13
Contact: Zhijian LI E-mail:lizj@sust.edu.cn

摘要/Abstract

摘要：

利用TG-FTIR技术研究陕西关中地区小麦秸秆（麦秆）、聚对苯二甲酸乙二醇酯（PET）及其两者混合物麦秆-PET（质量比1：1）在20 K/min的升温速率下的热解行为、主要热解产物、协同效应和动力学。研究结果表明：PET热解初始温度为375℃，最大热失重速率处的温度为454.9℃，失重率为62.87%，其热解残余质量为19.42%；麦秆-PET的热解DTG曲线表现为麦秆和PET主失重峰（339.9和444℃）的叠加，且混合试样在两个强峰处的失重率分别为22.9%和73.9%，最终热解残余质量为23.52%；PET和麦秆共热解过程中会出现两个协同效应（339.9和444℃），这使得共热解产物中的CO、CH₄以及芳香族、酸类、酮类、醛类、醇类、烷烃、酚类和醚类等轻质焦油组分含量高于麦秆和PET单独热解，共热解提高了热解产物的热值，改善了热解产物组成，提升了热解产物的稳定性和燃料品质；采用Coats-Redfern积分法计算得到PET在主热解区的表观活化能为355.48 kJ/mol，远高于麦秆的表观活化能（86.5 kJ/mol），麦秆-PET在低温区（258~363℃）的表观活化能为53.6 kJ/mol，在高温区（393~463℃）的表观活化能为81.6 kJ/mol。

关键词: 关中麦秆, 共热解, 协同效应, TG-FTIR, 热解动力学

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

中图分类号:

TQ35
TK62

胡炳涛, 李志健. PET和关中麦秆共热解特性及其动力学研究[J]. 生物质化学工程, 2021, 55(5): 1-7.

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

图/表 7

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参考文献 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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PET和关中麦秆共热解特性及其动力学研究

Co-pyrolysis Characteristics and Kinetics of PET and Wheat Straw

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