Syngas production from lignite via chemical looping gasification with hematite oxygen carrier enhanced by exogenous metals

Wei, Guoqiang; Yang, Ming‐Jen; Huang, Zhen; Bai, Hongcun; Chang, Guozhang; He, Fang; Yi, Qun; Huang, Yongqiang; Zheng, Anqing; Zhao, Kun; Lin, Yan

doi:10.1016/j.fuel.2022.124119

Cited by 16 publications

(4 citation statements)

References 45 publications

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“…The main component of hematite was Fe 2 O 3 , which precipitated lattice oxygen during gasification to promote rapid gasification reactions [44][45][46]. Researchers had found that the Fe-O bonds in the Fe 2 O 3 became weaken and break, which precipitated the lattice oxygen in the biomass gasification process [47,48]. Lattice oxygen could react quickly with biomass volatiles to form high-quality syngas.…”

Section: Gasification Properties Of Biomassmentioning

confidence: 99%

A Numerical Simulation and Experimental Study of Fluidization Characteristics of a Bubbling Fluidized Bed in Biomass Gasification

Gao,

Zhu,

Fang

et al. 2024

Energies

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Traditional fossil energy sources still dominate the world energy structure. And fully utilizing biomass is a viable approach for energy transition. A bubbling fluidized bed has better heat and mass transfer, while particle agglomeration limits the development of its industrial application. In this paper, two-phase flow characteristics of a bubbling fluidized bed are investigated by combining numerical simulations and fluidized bed gasification experiments. Numerical simulations found that the bed fluidization height reached twice the initial fluidization height at the 0.054 m initial fluidization height with uniform particle distribution. Fluidized bed gasification experiments found that syngas yield increased with increasing temperature. The carbon conversion efficiency reached 79.3% and the effective gas production was 0.64 m3/kg at 850 °C. In addition, when the water vapor concentration reached 15%, the carbon conversion efficiency and effective gas production reached the maximum values of 86.01% and 0.81 m3/kg, respectively.

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Section: Gasification Properties Of Biomassmentioning

confidence: 99%

A Numerical Simulation and Experimental Study of Fluidization Characteristics of a Bubbling Fluidized Bed in Biomass Gasification

Gao,

Zhu,

Fang

et al. 2024

Energies

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“…They pointed out that lignite preferentially pyrolyzes to produce interm and then further reacts with the oxygen carrier to generate synthesis gas, and th sponding oxygen carrier reaction path is Fe2O3 → Fe0.963O → Fe2O3. Wei et al [106] extended their work in developing a series of hematite oxygen carriers through nous metals. They showed that mixed oxygen carriers, such as NiFe2O4, C CoFe2O4, and CeFeO3, exhibit excellent performance in terms of high amounts of vacancy, strengthened lattice oxygen transfer ability, and enhanced lignite con efficiency.…”

Section: Chemical-looping Gasificationmentioning

confidence: 99%

“…In addition, other factors, such as ash content, solid residues, toxic gases, operating condi- In light of the advantages of the clean and efficient conversion of coal and hydrogenrich syngas production, much attention has been paid to the CLG technology with great achievement. However, many issues and challenges still urgently need to be overcome, as summarized as follows [67,104,106,114]: (1) the design and development of efficient oxygen carriers with high activity, high selectivity, anti-carbon deposition, excellent cycle stability, stable mechanical strength, long life, etc. need to be conducted.…”

Section: Chemical-looping Gasificationmentioning

confidence: 99%

Recent Progress on Hydrogen-Rich Syngas Production from Coal Gasification

et al. 2023

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Coal gasification is recognized as the core technology of clean coal utilization that exhibits significant advantages in hydrogen-rich syngas production and CO2 emission reduction. This review briefly discusses the recent research progress on various coal gasification techniques, including conventional coal gasification (fixed bed, fluidized bed, and entrained bed gasification) and relatively new coal gasification (supercritical water gasification, plasma gasification, chemical-looping gasification, and decoupling gasification) in terms of their gasifiers, process parameters (such as coal type, temperature, pressure, gasification agents, catalysts, etc.), advantages, and challenges. The capacity and potential of hydrogen production through different coal gasification technologies are also systematically analyzed. In this regard, the decoupling gasification technology based on pyrolysis, coal char–CO2 gasification, and CO shift reaction shows remarkable features in improving comprehensive utilization of coal, low-energy capture and conversion of CO2, as well as efficient hydrogen production. As the key unit of decoupling gasification, this work also reviews recent research advances (2019–2023) in coal char–CO2 gasification, the influence of different factors such as coal type, gasification agent composition, temperature, pressure, particle size, and catalyst on the char–CO2 gasification performance are studied, and its reaction kinetics are also outlined. This review serves as guidance for further excavating the potential of gasification technology in promoting clean fuel production and mitigating greenhouse gas emissions.

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“…During the CLG of solid waste, dehydration, devolatilization, and conversion of char occur successively with the reaction temperature increasing. Previous studies − have applied modified hematite in a fluidized bed and a fixed bed to explore the effect of exogenous metal modification on gaseous products in CLG experiments. The yield and quality of gaseous products were improved over nickel-modified hematite.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nickel-Modified Hematite on the Conversion of Volatile and Char during Chemical Looping Gasification of Wood-Based Panel Waste

Chen,

Zhang,

Lin

et al. 2024

Energy Fuels

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Nickel modification is a promising method to improve the reactivity of hematite in chemical looping gasification (CLG), but the effect of nickel-modified hematite on the conversion of volatiles and char remained unclear. In this work, thermogravimetric and CLG experiments of wood-based panel waste were applied to explore the conversion of volatile and char over nickel-modified hematite. Compared with original hematite, Ni-modified hematite exhibited higher weight loss during thermogravimetric experiments under a H 2 atmosphere (29.41− 31.00%), indicating that the nickel modification improved the oxidation capacity of hematite. The higher oxidation capacity of nickel-modified hematite can further promote the conversion of C/ H element in char, leading to a higher weight loss of wood-based panel waste over nickel-modified hematite (54.14−57.79%) than that over original hematite (52.48%) in thermogravimetric experiments. However, the reaction between oxygen carrier and wood-based panel waste concentrated in the char conversion stage, resulting in the negligible inhibition effect of nickel-modified hematite on HCN and NH 3 emission during the devolatilization stage. The total gas yield, valid gas yield, and carbon conversion rate in CLG over OC-Ni10 were higher than those over original hematite. Overall, the Ni-modified hematite can further promote the char conversion of WBPW to syngas during the CLG process.

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Syngas production from lignite via chemical looping gasification with hematite oxygen carrier enhanced by exogenous metals

Cited by 16 publications

References 45 publications

A Numerical Simulation and Experimental Study of Fluidization Characteristics of a Bubbling Fluidized Bed in Biomass Gasification

A Numerical Simulation and Experimental Study of Fluidization Characteristics of a Bubbling Fluidized Bed in Biomass Gasification

Recent Progress on Hydrogen-Rich Syngas Production from Coal Gasification

Effect of Nickel-Modified Hematite on the Conversion of Volatile and Char during Chemical Looping Gasification of Wood-Based Panel Waste

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