Preheating and combustion characteristics of anthracite under O2/N2, O2/CO2 and O2/CO2/H2O atmospheres

Article Thermodynamics

Morphology of char particles from coal pyrolysis in a pressurized entrained flow reactor: Effects of pressure and atmosphere

Jiaye Zhang et al.

Summary: This study investigated the pyrolysis behavior of coal at elevated pressure using a pressurized drop tube furnace, revealing that pressure, atmosphere, and coal rank significantly affect volatile releasing and char evolution.

ENERGY (2022)

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Article Energy & Fuels

Comparison of structural characteristics of high-organic-sulfur and low-organic-sulfur coal of various ranks based on FTIR and Raman spectroscopy

Cong Chen et al.

Summary: This study investigates the influence of organic sulfur on the molecular structure of coal through comparative analysis of high-organic-sulfur and low-organic-sulfur coals using FTIR and Raman spectroscopy. The research shows that coal with high organic sulfur content has lower aromaticity and graphitization degree compared to low-organic-sulfur coal at the same coal rank. The increase in coal rank leads to a decrease and then an increase in the graphitization degree of high-organic-sulfur coal. Furthermore, sulfur acts as a heteroatom hindering the graphitization of coal.

FUEL (2022)

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Article Thermodynamics

Experimental evaluation on NOx formation and burnout characteristics of oxy-fuel co-combustion of ultra-low volatile carbon- based solid fuels and bituminous coal

Chaowei Wang et al.

Summary: The experimental study on oxy-fuel co-firing of pyrolyzed semi-coke powder and gasification residual carbon shows that it can reduce NOx generation and improve carbon burnout efficiency. This research provides guidance for the clean and efficient utilization of carbon-based solid wastes and the development of carbon capture technology.

ENERGY (2022)

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Article Energy & Fuels

Experimental and kinetics analyses of a typical Zhundong coal reaction in O2/CO2/H2O atmosphere

Xiaoqian Liu et al.

Summary: Oxy-fuel combustion is a promising carbon capture technology that can alleviate the slagging and fouling issues in high alkali Zhundong coal-fired boilers. However, the existing kinetic models often neglect the gasification reactions by CO2 and H2O, leading to insufficient prediction accuracy. This study established a co-gasification reaction model and proposed a novel method considering the chemical cooling effect to calculate the char-O-2 reaction rate under high temperature and complex atmosphere. A comprehensive high temperature gasification reaction model was successfully developed.

FUEL (2022)

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Article Energy & Fuels

Experimental study on pulverized coal combustion preheated by a circulating fluidized bed: Preheating characteristics for peak shaving

Shujun Zhu et al.

Summary: This study examines the low-load operation and rapid load-change characteristics of pulverized coal combustion on a 1 MWth test platform, and verifies the feasibility of peak shaving for coal-fired power generation.

FUEL (2022)

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Article Energy & Fuels

Experimental study on conversion characteristics of anthracite and bituminous coal during preheating-gasification

Xiaoyu Zhang et al.

Summary: The conversion characteristics of anthracite and bituminous coal were studied under preheating by a circulating fluidized bed and deep gasification technology. The gasification reactivity of anthracite was lower compared to bituminous coal, but it increased after deep gasification. Factors that enhanced gasification reactivity included an increase of BET surface area, an expansion of pore structure, an increase of light aromatic rings, and a decrease of graphitization degree.

FUEL (2022)

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Article Thermodynamics

Perspectives of oxy-coal power plants equipped with CO2 capture, utilization, and storage in terms of energy, economic, and environmental impacts

Semie Kim et al.

Summary: The study investigated the impact of oxy-coal power plants equipped with CO2 capture facilities on electricity efficiency, CO2 emission rate, and global temperatures. The results showed that replacing conventional coal power plants can reduce global carbon emissions and lower temperatures.

ENERGY CONVERSION AND MANAGEMENT (2022)

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Article Thermodynamics

Realization and performance evaluation for long-term low-load operation of a CFB boiler unit

Feng Hong et al.

Summary: This paper explores the performance evaluation framework for CFB low-load operation, highlighting the importance of maintaining compatible fluidization and heat distribution in achieving long-term stable operation. A novel low-load control strategy for primary air volume has been proposed and verified through reliable data analysis and research.

ENERGY (2021)

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Article Thermodynamics

Techno-economic comparison between air-fired and oxy-fuel circulating fluidized bed power plants with ultra-supercritical cycle

Su Been Seo et al.

Summary: Oxy-fuel combustion technology can reduce nitrogen oxides and CO2 emissions, but requires additional equipment and causes energy loss. Despite the higher cost and energy penalty, oxy-fuel power plants are economically feasible.

ENERGY (2021)

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Article Energy & Fuels

Steam O2-enriched air gasification of lignite and solid recovered fuel in fluidized bed

Katia Gallucci et al.

Summary: The study conducted continuous gasification tests on a mixture of lignite and solid recovered fuel, evaluating the effects of different operating conditions on syngas quality, tar reduction effectiveness, and H2/CO molar ratio improvement. Results showed that gasification with a SRF/lignite mixture at 800 degrees C was feasible, with the best outcomes achieved using a SRF/lignite ratio of 0.2 wt/wt.

FUEL (2021)

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Article Energy & Fuels

Effect of the staged secondary air on NOx emission of pulverized semi-coke flameless combustion with coal preheating technology

Ziqu Ouyang et al.

Summary: The study demonstrates the potential of coal self-preheating combustion technology in reducing NOx emissions, especially with specific jet nozzles. Preheated fuel can achieve flameless combustion, resulting in significantly lower NOx emissions.

FUEL (2021)

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Article Energy & Fuels

Microstructure analysis of fluidized preheating pulverized coal under O2/CO2 atmospheres

Yuhua Liu et al.

Summary: In this study, the microstructure changes of fuel during preheating process were analyzed to reveal the impact on particle change behavior during combustion. It was found that during preheating, the main forms of N, C, and O elements in coal were pyrrole, hydrocarbon, and carbon-oxygen single bond respectively.

FUEL (2021)

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Review Chemistry, Physical

A review on reactivity characteristics and synergy behavior of biomass and coal Co-gasification

Juntao Wei et al.

Summary: Co-gasification is a promising method for the clean and efficient co-utilization of biomass and coal. Understanding the factors influencing co-gasification reactivity is crucial for revealing the reaction mechanism. Previous researchers have provided significant data for the industrial application of co-gasification technology.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2021)

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Article Thermodynamics

Identifying the contribution of rich-CO2/H2O gasification on the char conversion in typical atmospheres of chemical looping with oxygen uncoupling via single particle simulation

Chuanbao Zheng et al.

Summary: This study used single particle simulation to investigate the contribution of rich-CO2/H2O gasification reactions to char conversion in chemical looping with oxygen uncoupling (CLOU). The results show that the gasification reactions occurring in the inner core of the char particle hardly influence the oxidation reaction dominating the external layer, and the overall contribution of gasification reactions on the char conversion ranges from 1 to 20% in CLOU conditions.

COMBUSTION AND FLAME (2021)

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Article Energy & Fuels

Effects of the ratio of O2/C and H2O/C on sulfur release behaviors during fluidized bed gasification

Shengxian Xian et al.

Summary: In this study, the sulfur release behaviors of Guizhou coal during fluidized bed coal gasification were quantitatively determined, and the effects of O2/coal and H2O/coal ratios on sulfur release behaviors were investigated. The results showed that the yield of gaseous sulfur is influenced by the ratios of oxygen and steam.

FUEL (2021)

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Article Energy & Fuels

Experimental study on NOx emissions of pulverized coal combustion preheated by a 2 MW novel self-sustained preheating combustor

Ziqu Ouyang et al.

Summary: The study introduced a potentially feasible low-NOx combustion technology based on self-sustained preheating of pulverized coal, achieving a minimum NOx emission of 72 mg/Nm(3) (@ 6% O-2). By using an IFBC as the preheating chamber and exploring the effects of air staging ratio and tertiary air positions, it was found that reducing retention time and promoting uniform mixing of reactants were crucial in significantly reducing NOx emissions. The multi-layer arrangement and delayed supply of tertiary air were identified as effective methods in reducing NOx emissions.

FUEL (2021)

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Article Energy & Fuels

Effect of mineral extraction on the evolution of nitrogen functionalities during coal pyrolysis

Lihong Wei et al.

Summary: The mineral composition of coal significantly affects the pyrolysis of coal and the evolution of nitrogen-containing functional groups. Different extraction pretreatments have varying effects on the nitrogen conversion mechanism in coal, with different minerals playing important roles in the transformation of char-N to tar-N/gas-N. These findings provide valuable data support for clean coal combustion and improving coal tar quality.

FUEL (2021)

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Article Energy & Fuels

Experimental study on weakly caking coal combustion preheated by circulating fluidized bed

Shujun Zhu et al.

Summary: This study achieved stable high-efficiency and low-NOx combustion of weakly caking coal by preheating fuel in a PCFB. High preheating temperature and fluidizing gas velocity helped alleviate or resolve preheating instability, while arranging combustion air position effectively reduced NO emissions. The findings highlight the potential of preheating combustion technology for improving combustion performance and reducing emissions.

FUEL (2021)

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Article Energy & Fuels

Experimental investigation for the combustion characteristics of blends of three kinds of coal

Chao Tong et al.

Summary: The study shows that the combustion characteristics of blended coals vary with the percentage of petroleum coke in the blend, with 30% petroleum coke content resulting in optimal combustion performance. Kinetic analysis reveals the relationship between the combustion characteristics of blended coals and activation energy.

FUEL (2021)

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Article Energy & Fuels

The effects of particle size on flameless combustion characteristics and NOx emissions of semi-coke with coal

Hongliang Ding et al.

Summary: The experiments showed that the particle size of Shenmu semi-coke significantly affected the composition yield, coal char activity, combustion process, and NOx emissions of high-temperature coal gas. Specifically, a particle size of 163.84 μm led to the highest combustion efficiency of 98.23% with flameless combustion achieved. Additionally, a critical value of 198.54 μm for Shenmu semi-coke particles was identified, affecting NOx emissions.

FUEL (2021)

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Article Energy & Fuels