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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front. Chem. Sci. Eng.    2024, Vol. 18 Issue (10) : 119    https://doi.org/10.1007/s11705-024-2470-9
Effect of binder addition on combustion characteristics of cotton straw pellets and kinetic analysis
Yiwen Dai1, Bin Guan1, Xingxiang Wang1, Jinli Zhang1,2, Bin Dai1, Jiangbing Li1(), Jichang Liu1
1. School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi 832003, China
2. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
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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.

Keywords biomass straw pellet      comprehensive combustion index      flammability index      combustion kinetics     
Corresponding Author(s): Jiangbing Li   
Just Accepted Date: 08 May 2024   Issue Date: 24 July 2024
 Cite this article:   
Yiwen Dai,Bin Guan,Xingxiang Wang, et al. Effect of binder addition on combustion characteristics of cotton straw pellets and kinetic analysis[J]. Front. Chem. Sci. Eng., 2024, 18(10): 119.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-024-2470-9
https://academic.hep.com.cn/fcse/EN/Y2024/V18/I10/119
SampleProximate analysis/%Ultimate analysis/%HHVdaf/(MJ·kg–1)
VarMarAarFCarCdHdOdNdSd
CS69.334.56.0520.1241.985.93439.6051.680.25118.644
CG98.60.130.111.1684.912.3762.4840046.586
PE5.270.7680.7813.1914.930.4360.9841.530.583.747
Tab.1  Proximate analysis and ultimate analysis of CS, CG, and PE samples
SamplesConcentration/%, dry
NaMgAlKCaSiFeCoZn
CS-untreated0.0230.3500.0350.7120.3561.1350.0230.002
CS-treated0.0180.1300.5070.2310.960.0100.001
CG0.4590.0030.0371.9310.0121.580.9970.0010.003
PE0.0020.0010.0010.0020.003
Tab.2  Analysis of main ash-forming elements of CS, CG, and PE samples
Fig.1  The FTIR of CS powder and pellet, CG, PE, and samples mixed with PE and CG.
Fig.2  TG and DTG curves of CS powder, waste mulch, and CG. (a) TG, and (b) DTG.
Fig.3  The TG-MS of CS pellet, pellet 12.5% CG, pellet 12.5% PE and pellet 12.5% PE + 12.5% CG. (a) m/z = 18; (b) m/z = 28; (c) m/z = 44.
Fig.4  TG and DTG figures of samples. (a, b) CS powder, (c, d) CS pellet, (e, f) pellet 12.5% PE, (g, h) pellet 12.5% CG, (i, j) pellet 12.5% PE + 12.5% CG, and (k, l) theory and practice fit.
Fig.5  C-R models of fuel at 30 °C·min–1 combustion rates. () CS powder, (○) CS pellet, (△) 12.5% PE pellet, (◇) 12.5% CG pellet, and (☆) 12.5% PE + 12.5% CG pellet.
Fig.6  Schematic diagram of Ea under different combustion rates. (a) volatile combustion stage, and (b) fixed carbon combustion stage.
Fig.7  The Ea of different conversion rates. (a) FWO; (b) Starink.
Fig.8  Comparison of Ea at different combustion stages. (a) volatile combustion stage, and (b) fixed carbon combustion stage. A: CS powder; B: CS pellet; C: 12.5% PE pellet; D: pellet 12.5% CG; E: 12.5% PE + 12.5% CG pellet.
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[1] Ruixia ZHANG, Zhaoping ZHONG, Yaji HUANG. Combustion characteristics and kinetics of bio-oil[J]. Front Chem Eng Chin, 2009, 3(2): 119-124.
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