Combustion and heat transfer characteristics of co-firing biomass and coal under oxy-fuel condition

Lv, Qiang; Wang, Chang‐An; Liu, Xuan; Du, Yongbo; Li, Debo; Che, Defu

doi:10.1002/er.4163

Cited by 16 publications

(13 citation statements)

References 42 publications

(107 reference statements)

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“…As an extension of conventional biomass energy, unconventional biomass not only can regenerate in the original growth position but also has lower ash content and lower S and N content than coal. Its application will help to achieve the goals of CO 2 emission reduction in the Paris Protocol …”

Section: Introductionmentioning

confidence: 99%

An experimental study of single unconventional biomass pellets: Ignition characteristics, combustion processes, and artificial neural network modeling

Lin

Wang

et al. 2020

Int J Energy Res

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Summary This study applied the artificial neural networks (ANNs) model to the thermal data obtained by suspension ignition and combustion experiment of single peanut shells (PS, millimeter scale) pellet under O2/CO2 atmosphere. ANN11 was the best ANN model for predicting the relevant parameters of PS combustion. The coincidence between ANN prediction data and experimental data was over 99%. Two modes of biomass pellet ignition were observed: homogeneous ignition of volatiles and hetero‐homogeneous ignition of volatiles and char simultaneously. The ignition mode was transformed from homogeneous ignition to hetero‐homogeneous ignition when oxygen concentration was 50%. In addition, it was observed that ignition at the bottom emerged first, and then the upper end was ignited, finally generating an envelope flame. This phenomenon occurred when gas flow temperature exceeded 873 K or the oxygen concentration was greater than 50%. The reduction of ignition delay time and internal ignition temperature from 21% to 50% oxygen concentration was more intense than that of 50% to 100% oxygen concentration. Increasing oxygen concentration or temperature resulted in a shorter, brighter, and more stable volatile flame of biomass pellets, which reduced volatile burnout time. Nevertheless, the impact of gas flow rate on biomass combustion was intricate and irregular.

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Section: Introductionmentioning

confidence: 99%

An experimental study of single unconventional biomass pellets: Ignition characteristics, combustion processes, and artificial neural network modeling

Lin

Wang

et al. 2020

Int J Energy Res

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“…15 As a result, systematic analysis of heat transfer characteristics during fuel combustion can F I G U R E 1 The traditional ABF structure: (A) photo of the traditional ABF; (B) side view of the traditional ABF (cross-section A-A); (C) side view of the traditional ABF (cross-section B-B) [Colour figure can be viewed at wileyonlinelibrary.com] effectively reduce the energy consumption. 19 How to improve the anode quality and reduce energy consumption are important challenges for the anode production. Therefore, it is extremely urgent to restructure the furnace and optimize the gas circulation within it.…”

Section: Low Efficiency and High Energy Consumption During The Bakimentioning

confidence: 99%

“…In this typical ABF, the carbon consumption per ton of aluminum production increases from 410 kg to 470 kg with an additional cost 15 . As a result, systematic analysis of heat transfer characteristics during fuel combustion can effectively reduce the energy consumption 19 . How to improve the anode quality and reduce energy consumption are important challenges for the anode production.…”

Section: Introductionmentioning

confidence: 99%

Structural and thermal analysis of an innovative baking furnace for carbon anode production

2020

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The urgent demands for the high efficiency and low consumption of carbon anode baking process stimulate the structure optimization of the baking furnace. In this paper, a closed-top innovative anode baking furnace (CTABF) with periodically arranged burners and anode crucibles is proposed, and the thermal process in the CTABF is studied via a coupled multi-physics model and the in situ measurement. Results show that the multi-channel design changes the one-way high-temperature flue gas path and increases its residence time in the furnace, while the temperature distributions in the inner and outer crucibles show good uniformity. The average convective heat flux accounts for about 68% of the total heat flux around the crucible surface, and thus the baking rate of anodes can be controlled by adjusting the power of driven fan. Therefore, due to the above structural retrofits, the baking time and energy consumption are reduced and the baking quality is improved, showing the superiority of the proposed CTABF over the traditional ABF.

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“…They further added that 100% straw firing raised the CO emission level as a consequence of an increase in residence time by increasing straw share in fuel. Lv et al performed the numerical investigation of co‐combustion of coal and biomass in 600 MW boiler. They mainly focused on heat transfer and burnout characteristics under various operating conditions and for various biomass proportions.…”

Section: Aspects Of Coal Combustionmentioning

confidence: 99%

A complete review based on various aspects of pulverized coal combustion

Yadav

Mondal

2019

Int J Energy Res

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Summary Coal is the most abundant energy source, and around 40% of the world's electricity is produced by coal combustion. The emission generated through it put a constraint on power production by coal combustion. There is a need to reduce the emissions generated through it to utilize the enormous energy of coal for power production. Detailed understanding of various aspects of coal combustion is required to reduce the emissions from coal‐fired furnaces. The aim of present paper is to review various aspects of pulverized coal combustion such as oxy‐fuel combustion, co‐combustion of coal and biomass, emissions from pulverized coal furnaces, ash formation and deposition, and carbon capture and sequestration (CCS) technologies to outline the progress made in these aspects. Both experimental and numerical aspects are included in this review. This review also discusses the thermodynamic aspects of the combustion process. Furthermore, the effect of various submodels such as devolatilization models, char combustion models, radiation models, and turbulent models on the process of pulverized coal combustion has been investigated in this paper.

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Combustion and heat transfer characteristics of co-firing biomass and coal under oxy-fuel condition

Cited by 16 publications

References 42 publications

An experimental study of single unconventional biomass pellets: Ignition characteristics, combustion processes, and artificial neural network modeling

An experimental study of single unconventional biomass pellets: Ignition characteristics, combustion processes, and artificial neural network modeling

Structural and thermal analysis of an innovative baking furnace for carbon anode production

A complete review based on various aspects of pulverized coal combustion

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