CO2 and air pollutant emissions from bio-coal briquettes

Li, Gang; Hu, Ruichen; Hao, Yuhang; Yang, Tenglun; Li, Lianliang; Luo, Zhihan; Xie, Longjiao; Zou, Nan; Liu, Cheng; Sun, Chao; Shen, Guofeng

doi:10.1016/j.eti.2022.102975

Cited by 26 publications

(9 citation statements)

References 50 publications

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“…The heating methods, reaction characteristics, and internal mechanisms of pyrolysis and combustion processes are different, and the corresponding engineering application scenarios are also different. 12,62 The differences in pyrolysis and combustion reaction processes will lead to the diversity and heterogeneity of the release characteristics (e.g., chemical parameters and reaction pathways) of VOCs. The differences in these processes apply not only to biomass or coal fuels but also to co-firing or biomass− coal briquettes.…”

Section: Environmental Implicationmentioning

confidence: 99%

“…Future research is also required to better quantify and evaluate more volatile organic pollutants during in situ biomass–coal co-pyrolysis, thereby advancing our understanding of the potential environmental pollution risks when pollutants enter the atmosphere. The heating methods, reaction characteristics, and internal mechanisms of pyrolysis and combustion processes are different, and the corresponding engineering application scenarios are also different. , The differences in pyrolysis and combustion reaction processes will lead to the diversity and heterogeneity of the release characteristics (e.g., chemical parameters and reaction pathways) of VOCs. The differences in these processes apply not only to biomass or coal fuels but also to co-firing or biomass–coal briquettes.…”

Section: Environmental Implicationmentioning

confidence: 99%

“…As a sustainable energy option, the co-pyrolysis or co-combustion of biomass and coal can reduce the emissions of gaseous pollutants, PM 2.5 , and toxic chemicals, leading to significant air quality and health benefits. − The co-pyrolysis of biomass and coal also has advantages in low fuel cost, few waste-disposal problems, and useful contribution to CO 2 balance. ,, Li et al (2023) pioneered the systematic and innovative study of CO 2 and air pollutant emissions from co-pyrolysis/co-firing of biomass–coal briquettes, which indicated that this technique with high efficiency and cleaning potentials emitted less greenhouse gases like 38% CO 2 and 45% CH 4 and air pollutants like 52% CO, 45% NO, and 29% PM 2.5 than bituminous coals . Notably, the disadvantages/debates of co-pyrolysis of biomass and coal also need attention.…”

Section: Introductionmentioning

confidence: 99%

“…Notably, the disadvantages/debates of co-pyrolysis of biomass and coal also need attention. For example, the direct co-combustion of coal and biomass is not practical in either industrial boilers or other facilities, due to problems including formation of striated flows, lower combustion and heating transfer efficiencies, increased risks of corrosion, and ash deposition . Moreover, numerous reactions occur involving the destruction and reorganization of structures during co-pyrolysis of biomass and coal. , The thermogravimetric characteristics and reaction mechanism of coal and biomass co-pyrolysis are more complicated than those of the single pyrolysis processes of coal or biomass.…”

Section: Introductionmentioning

confidence: 99%

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Real-Time Emission, Chemical Properties, and Dynamic Evolution Mechanism of Volatile Organic Compounds during Co-Pyrolysis of Rice Straw and Semi-Bituminous Coal

Song

Bai

et al. 2023

ACS EST Eng.

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The co-pyrolysis of biomass–coal blends improves energy utilization efficiency; however, the synergistic mechanisms behind thermal degradation and volatile formation remain unclear. We combined online thermogravimetry–Fourier transform infrared spectrometry–gas chromatography/mass spectrometry (TG–FTIR–GC/MS), Gaussian deconvolution, and two-dimensional correlation spectrometry (2D-COS) to reveal the component degradation, sequential response, and evolution mechanism of volatiles during co-pyrolysis of rice straw (RS) and semi-bituminous coal (SBC), which were mixed in three proportions of 1:3, 1:1, and 3:1. The activation energies (24.70–53.43 kJ mol–1) and preexponential factors (44.67–7663.43 min–1) for decomposition and average emission intensity coefficient (EIC) (0.06–0.12) of volatiles exhibited significant heterogeneity and were highly dependent on pyrolysis temperature and blend proportion. The EIC values of phenols/esters, alcohols/ethers, ketones, aldehydes, and acids increased with increasing RS proportion. The volatile distribution of blends with high SBC proportions was mainly located in the decarbonylation/dehydration reaction region. Moreover, the volatile organic compound (VOC) and intermediate VOC percentages were 59–83 and 17–39%, respectively, with N-containing species contributing the most to the intermediate VOC fraction. Most of the volatiles mainly exhibited reducing character, with average carbon oxidation state below zero. An increase in the proportion of RS and SBC contributed to high unsaturation and small carbon skeletons of volatiles, respectively. Notably, the primary sequential temperature response of volatiles was hydrocarbons, alcohols/phenols/ethers/esters, and (aldehydes/ketones/acids, aromatics), in that order. Furthermore, we proposed a novel synergistic mechanism to demonstrate that the heterogeneous degradation of RS/SBC components contributed significantly to the dynamic formation of volatiles during the co-pyrolysis process. These novel insights into the mechanisms of biomass–coal co-pyrolysis are useful for energy optimization and pollution control.

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Section: Environmental Implicationmentioning

confidence: 99%

Section: Environmental Implicationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Real-Time Emission, Chemical Properties, and Dynamic Evolution Mechanism of Volatile Organic Compounds during Co-Pyrolysis of Rice Straw and Semi-Bituminous Coal

Song

Bai

et al. 2023

ACS EST Eng.

View full text Add to dashboard Cite

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“…On the other hand, appropriate catalyst carriers are of great significance to improving the dispersibility of active components. Common catalyst carriers include mesoporous aluminum silicates, graphene, zeolite molecular sieves (ZMS), biomass-activated carbon, and natural minerals [ 29 , 30 , 31 , 32 ]. Carbon-based carriers have attracted much attention because of their advantages of developed pore structures, large specific surface area, and low price in recent years [ 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Performance of Carbon-Based Ce-Mn Catalysts for Efficient Degradation of Acetone at Low Temperatures

Wang

Shi

et al. 2022

IJERPH

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Based on the porous carbon material from citric acid residue, catalysts of different Ce-Mn ratios were prepared with incipient-wetness impregnation (IWI) to delve into their acetone-degrading performance and relevant mechanisms. When the Ce-Mn molar ratio is 0.8, the prepared catalyst Ce0.8-Mn/AC shows abundant and uniformly dispersed Mn and Ce particles on the surface. The content of Mn and Ce on the Ce0.8-Mn/AC surface reaches 5.64% and 0.75%, respectively. At the acetone concentration of 238 mg/m3 (100 ppm), the laws of acetone degradation in different catalysts at different catalyzing temperatures and with various oxygen concentrations were studied, and we found that the rate of acetone degradation by Ce0.8-Mn/AC can exceed 90% at 250 °C. Cerium oxide and manganese oxide are synergistic in the catalytic degradation of acetone. Adding cerium to manganese-based catalysts can increase the oxygen migration rate in the catalysts and thus raise the reduction rate of lattice oxygen in manganese oxide. The results offer new ideas and approaches for the efficient and comprehensive utilization of bio-fermentation by-products, and for the development of cheap and high degradation performance catalysts for acetone.

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