Oxy-fuel and air atmosphere combustions of Chinese medicine residues: Performances, mechanisms, flue gas emission, and ash properties

Chen, Zhiyun; Liu, Jingyong; Chen, Huashan; Ding, Ziyi; Tang, Xiaolin; Evrendilek, Fatih

doi:10.1016/j.renene.2021.10.010

Cited by 51 publications

(8 citation statements)

References 64 publications

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“…Δ T 1/2 is the temperature interval in the half-peak width of DTG curves. The higher index D indicated that the volatile was released more dramatically, and the pyrolysis reaction proceeded more efficiently . As exhibited in Table , the index D of SMP was much lower than that of polyolefins, which implies a more challenging pyrolytic reaction .…”

Section: Resultsmentioning

confidence: 97%

“…The higher index D indicated that the volatile was released more dramatically, and the pyrolysis reaction proceeded more efficiently. 44 As exhibited in Table 2, the index D of SMP was much lower than that of polyolefins, which implies a more challenging pyrolytic reaction. 43 Because in PP, most carbons in the molecules are tertiary carbons, the easier formation of a carbocation in the thermal degradation led to lower T s and T m of PP.…”

Section: ■ Experimental Sectionmentioning

confidence: 95%

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Kinetics, Product Evolution, and Mechanism for the Pyrolysis of Typical Plastic Waste

Zhang

Wang

et al. 2021

ACS Sustainable Chem. Eng.

100

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This research investigates the kinetic, product evolution, mechanism of polyethylene (PE), polypropylene (PP), and a simulated mixture of plastic waste (SMP) via TGA/DSC−MS and Py-GC−MS. The pyrolysis reactions were predominantly endothermic, and the main degradation stage of PE, PP, and SMP ranged from 389.85 to 502.17 °C, from 374.91 to 495.15 °C, and from 368.30 to 496.29 °C, respectively. The kinetic results showed that polyolefin pyrolysis was identified to be the geometrical contraction models with apparent activation energies of 224.31−235.32 kJ mol −1 for PE and 199.00−207.66 kJ mol −1 for PP, respectively. The SMP pyrolysis follows the first-order reaction models, and its apparent activation energy was 185.29−199.54 kJ mol −1 . Polyolefin pyrolysis products only contain C 4 −C 35 paraffin with linear alkenes for PE and branch or cyclic alkenes for PP. The large amounts of benzene radicals in the pyrolysis of SMP tended to form aromatics. The pyrolysis behavior and product formation mechanism of the plastic waste could make available practical implications for the reactor design and parameter optimization.

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Section: Resultsmentioning

confidence: 97%

Section: ■ Experimental Sectionmentioning

confidence: 95%

Kinetics, Product Evolution, and Mechanism for the Pyrolysis of Typical Plastic Waste

Zhang

Wang

et al. 2021

ACS Sustainable Chem. Eng.

100

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“…Air, oxygen enrichment, pure oxygen, water vapor, and carbon dioxide are typical gasification media for pyrolysis [94,96] . The current study found that the combustion performances of TCMR differ in air and oxy‐fuel atmospheres [107] . Furthermore, the increased oxygen level stimulated CO 2 emissions.…”

Section: Pyrolysis Of Tcmrmentioning

confidence: 61%

Recent Advances in Solid Residues Resource Utilization in Traditional Chinese Medicine

Long

Guo

et al. 2023

ChemistrySelect

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Chinese medicine is widely employed in illness prevention and treatment. In recent years, the increased demand for Chinese medicine resources has resulted in a large quantity of waste created during industrialization. However, traditional methods for treating herbal residues, including burning, stacking, and burying, can cause significant environmental damage and resource waste. Furthermore, these application approaches have a low level of resource utilization and a low degree of utilization. Therefore, developing a classification management system is a necessary precondition for reusing Chinese herb residues for medicinal, feed, fertilizer, and energy resource reuse. This paper reviews the potential applications of Chinese herb residues in the extraction of active resources, composting, feed addition, bioethanol preparation, and pyrolysis to biochar, bio‐oil, and fuel gas. Overall, this work provides a foundation for further investigation into the high‐value usage model and resource reuse pathway of Chinese herb residues.

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“…The devolatilization stages including the corresponding sub-stages of waste rubber and polyurethane tires were best described by the reaction mechanism models . Notably, the artificial neural network-based data analysis was adopted for the operation optimization. , The theoretical models combined with experimental data can facilitate a better understanding and optimization of the pyrolysis of waste tires. , However, sufficient experimental data are also required for building best-fit functions. In addition, the lack of key intermediate product data may also bring difficulties to the analysis of the reaction path.…”

Section: Introductionmentioning

confidence: 99%

“… 14 Notably, the artificial neural network-based data analysis was adopted for the operation optimization. 15 , 16 The theoretical models combined with experimental data can facilitate a better understanding and optimization of the pyrolysis of waste tires. 17 , 18 However, sufficient experimental data are also required for building best-fit functions.…”

Section: Introductionmentioning

confidence: 99%

Formation Mechanism of Monocyclic Aromatic Hydrocarbons during Pyrolysis of Styrene Butadiene Rubber in Waste Passenger Car Tires

Zheng

Yao

et al. 2022

ACS Omega

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The production of aromatic hydrocarbons from the waste tire pyrolysis attracts more and more attention because of its tremendous potential. Based on styrene-butadiene rubber (SBR), which is the main rubber in the waste passenger car tires, this work studies the temperature influence on primary pyrolysis product distribution by experimental techniques (Py-GC/MS, TG−MS), and then, the formation mechanism of monocyclic aromatic hydrocarbons (MAHs) observed in the experiment was analyzed by first-principles calculations. The experimental results show that the MAHs during the pyrolysis mainly include styrene, toluene, and xylene, and subsequent calculations showed that these compounds were formed through a series of primary and secondary reactions. The formation pathways of these typical MAHs were studied via the reaction energy barrier analysis, respectively. It shows that the MAHs were not only derived from the benzene ring in the SBR chain but also generated from short-chain alkenes through the Diels−Alder reaction. The obtained pyrolysis reaction mechanism provides theoretical guidance for the regulation of the pyrolysis product distribution of MAHs.

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Oxy-fuel and air atmosphere combustions of Chinese medicine residues: Performances, mechanisms, flue gas emission, and ash properties

Cited by 51 publications

References 64 publications

Kinetics, Product Evolution, and Mechanism for the Pyrolysis of Typical Plastic Waste

Kinetics, Product Evolution, and Mechanism for the Pyrolysis of Typical Plastic Waste

Recent Advances in Solid Residues Resource Utilization in Traditional Chinese Medicine

Formation Mechanism of Monocyclic Aromatic Hydrocarbons during Pyrolysis of Styrene Butadiene Rubber in Waste Passenger Car Tires

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