Effect of binder addition on combustion characteristics of cotton straw pellets and kinetic analysis

IF 4.3 3区工程技术 Q2 ENGINEERING, CHEMICAL

Frontiers of Chemical Science and Engineering Pub Date : 2024-07-16 DOI:10.1007/s11705-024-2470-9

Yiwen Dai, Bin Guan, Xingxiang Wang, Jinli Zhang, Bin Dai, Jiangbing Li, Jichang Liu

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Abstract

In this study, the combustion characteristics and kinetics of cotton straw (CS) particles mixed with polyethylene (PE) film and coal gangue (CG) were investigated. The co-combustion characteristics of CS mixed with PE and CG at different heating rates were revealed by the thermogravimetric method and differential thermogravimetric method. The ignition temperature, burnout temperature, and maximum weight loss rate were measured, and the comprehensive combustion and flammability indexes were calculated. The results showed that the composite combustion characteristic index and flammability index increased with the increase in heating rate. The addition of PE and CG additives could effectively extend the combustion time. The Coats-Redfern (C-R) reaction model and N-order reaction model were used to evaluate the kinetic parameters of the blends. The results showed that 12.5% PE + 12.5% CG particles had the lowest activation energy (Ea = 103.73 kJ·mol⁻¹) at the volatile combustion stage. The dynamics conform to the third-order dynamics model. In addition, the applicability of C-R model, Flynn-Wall-Ozawa (FWO) model, and Starink model in the calculation of activation energy was explored, and it was found that the FWO model is not suitable for the calculation of activation energy of biomass pellet combustion kinetics. This study provides a new method for the development and utilization of mixed fuel particles of cotton stalk and solid waste and expands the application prospect of biomass.

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添加粘合剂对棉花秸秆颗粒燃烧特性的影响及动力学分析

本研究探讨了棉花秸秆（CS）颗粒与聚乙烯（PE）薄膜和煤矸石（CG）混合后的燃烧特性和动力学。热重法和差热重法测定了不同加热速率下棉秆（CS）与聚乙烯（PE）和煤矸石（CG）的混合燃烧特性。测量了着火温度、燃尽温度和最大失重率，并计算了综合燃烧指数和可燃性指数。结果表明，综合燃烧特性指数和可燃性指数随加热速率的增加而增加。添加 PE 和 CG 添加剂可有效延长燃烧时间。采用 Coats-Redfern (C-R) 反应模型和 N-阶反应模型评估了混合物的动力学参数。结果表明，12.5% PE + 12.5% CG 粒子在挥发燃烧阶段的活化能最低（Ea = 103.73 kJ-mol-1）。其动力学符合三阶动力学模型。此外，还探讨了 C-R 模型、Flynn-Wall-Ozawa（FWO）模型和 Starink 模型在活化能计算中的适用性，发现 FWO 模型不适合生物质颗粒燃烧动力学活化能的计算。该研究为棉秆与固体废弃物混合燃料颗粒的开发利用提供了一种新方法，拓展了生物质的应用前景。

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来源期刊

Frontiers of Chemical Science and Engineering ENGINEERING, CHEMICAL-

CiteScore

7.60

自引率

6.70%

发文量

868

审稿时长

1 months

期刊介绍： Frontiers of Chemical Science and Engineering presents the latest developments in chemical science and engineering, emphasizing emerging and multidisciplinary fields and international trends in research and development. The journal promotes communication and exchange between scientists all over the world. The contents include original reviews, research papers and short communications. Coverage includes catalysis and reaction engineering, clean energy, functional material, nanotechnology and nanoscience, biomaterials and biotechnology, particle technology and multiphase processing, separation science and technology, sustainable technologies and green processing.