Study on pyrolysis characteristics of paper mill solid waste based on synergistic effects of its components

doi:10.11949/0438-1157.20211428

Abstract

Abstract:

In order to clarify the pyrolysis characteristics of actual paper mill solid waste under the real component ratio and the influence of the synergistic effects between the components on its pyrolysis behavior, the real ratio of the components of the actual paper mill solid waste was determined by manual sorting. Besides, combined with DG-DAEM kinetic analysis, TG-FTIR and Py-GC/MS experiment were performed to systematically investigate the influence mechanism of the synergistic effects between the components on its pyrolysis behavior and the distribution of main pyrolysis products of paper mill solid waste. The results showed that the synergistic effects of its components had a significant impact on the pyrolysis process of actual paper mill solid waste. The synergistic effects of the components were not only conducive to the release of volatiles in the pyrolysis process of paper mill solid waste, but also could effectively promote the generation of small molecules like CH₄. Further kinetic analysis showed that the degradation reaction was dominant during the pyrolysis process of mixture sample of paper mill solid waste. In addition, at different temperatures, the experimental value of the relative content of hydrocarbons in the main liquid pyrolysis product distribution of the mixture sample was always higher than its theoretical value, while the experimental value of the relative content of the total oxygen-containing components was always lower than its theoretical value. The synergistic effect between the components of the mixed sample is beneficial to the deoxygenation of oxygen-containing components in the pyrolysis product and the conversion to hydrocarbon products.

Key words: components, synergistic effects, pyrolysis, waste treatment, TG-FTIR, Py-GC/MS, DG-DAEM

摘要：

为了明晰真实组分比例下实际造纸固废的热解特性以及组分间协同效应对热解行为的影响，通过人工分拣确定实际造纸固废的真实组分比例，进行了TG-FTIR和Py-GC/MS实验，并结合DG-DAEM动力学分析，系统地研究了组分协同效应对造纸固废热解行为及其主要热解产物分布的影响机制。结果表明，组分协同效应对实际造纸固废热解过程具有显著影响。组分协同效应不仅有利于造纸固废热解过程中挥发分的释放，还可以有效促进CH₄小分子的生成。进一步的动力学分析表明，造纸固废混合样品热解过程中降解反应更占优势。此外，在不同温度下，混合样品主要液态热解产物分布中碳氢化合物相对含量的实验值总是高于其理论值，而总的含氧组分的相对含量的实验值总是低于其理论值，混合样品组分间的协同效应有利于热解产物中含氧组分的脱氧以及向烃类产物的转化。

关键词: 组分, 协同效应, 热解, 废物处理, TG-FTIR, Py-GC/MS, DG-DAEM

CLC Number:

X 705

Guanyu WANG, Lingjun ZHU, Jinsong ZHOU, Shurong WANG. Study on pyrolysis characteristics of paper mill solid waste based on synergistic effects of its components[J]. CIESC Journal, 2022, 73(1): 393-401.

王冠宇, 朱玲君, 周劲松, 王树荣. 基于组分协同效应的造纸厂固体废弃物热解特性研究[J]. 化工学报, 2022, 73(1): 393-401.

Figures/Tables 9

Table 1 Results of proximate and ultimate analysis of paper sample， plastic sample and mixture sample

样品	工业分析/%				元素分析/%
样品	M_ad	A_ad	V_ad	FC_ad	C_ad	H_ad	N_ad	St_ad	O_ad^①
纸类样品	9.80	6.65	69.82	13.73	38.62	4.84	0.25	0.95	38.89
塑料样品	2.93	12.12	78.71	6.24	55.59	8.18	0.13	1.48	19.57
混合样品	4.97	10.24	75.80	8.99	48.54	8.45	0.18	0.91	26.71

Fig.1 TG and DTG curves of paper sample, plastic sample and mixture sample at heating rate of 20℃/min

Fig.2 Comparison of experimental and theoretical TG curves of mixture sample

Table 2 Kinetic parameters of three samples based on DG-DAEM fitting

样品	E₀₁/(kJ/mol)	σ₁/(kJ/mol)	lgA/s^-1	E₀₂/(kJ/mol)	σ₂/(kJ/mol)	ω
纸类样品	167.59	4.32	12.03	200.02	58.81	0.75
塑料样品	170.86	14.76	12.20	210.52	6.38	0.55
混合样品	170.25	10.94	12.32	211.00	9.13	0.58

Fig.3 Comparison of the experimental curves and fitting curves of three samples based on DG-DAEM

Fig.4 FTIR spectra of three samples at their maximum absorption peaks

Fig.5 Variation of release of typical gaseous products with temperature

Fig.6 Distribution of main pyrolysis products of single component samples at different temperatures

Fig.7 Comparison of experimental and theoretical distribution of main pyrolysis products of mixture sample at different temperatures

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