Thermodynamics and kinetics analysis from liquid chemical looping gasification of lignin with bismuth-based oxygen carrier

Guo, Wei; Zhang, Bo; Zhang, Rongjiang; Zhang, Jie; Li, Yaowu; Wu, Zhiqiang; Ma, Jingjing; Yang, Bolun

doi:10.1016/j.fuproc.2021.106888

Cited by 14 publications

(12 citation statements)

References 55 publications

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“…The LHV of syngas (LHV syngas ) was calculated using the following equation , normalL normalH normalV normals normaly normaln normalg normala normals = 35.81 normalx normalC normalH 4 + 12.63 normalx normalc normalo + 10.79 normalx normalH 2 .25em ( M J / N m 3 ) where normalx normalC normalH 4 ,x co , and normalx normalH 2 are the mole fractions of methane, carbon monoxide, and hydrogen in syngas, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…After preheating the air and steam and powering the TR, the BTCLG system generates additional energy called “surplus energy”. , The surplus energy is the sensible heat in high-temperature syngas and flue gas, which the process cannot use without changing operating conditions but can be used by downstream processes or power generation equipment . The surplus energy was calculated using the following formula E normalS = E normals normaly normaln normalg normala normals + E normalw normala normals normalt normale .25em normalg normala normals .25em ( M J / h ) where E syngas and E waste gas are the sensible heat carried by the syngas and the flue gas, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…6,26 Finally, whether this complex coupling process would encounter operational or control issues during the actual process remains to be assessed. 38 Unfortunately, very few studies have investigated the effect of torrefaction on BCLG systems. Fan et al 30 conducted gasification experiments using different OCs and torrefied eucalyptus wood as the raw material in a quartz tubular reactor.…”

Section: Introductionmentioning

confidence: 99%

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Performance Evaluation of Torrefaction Coupled with a Chemical Looping Gasification Process under Autothermal Conditions: Flexible Syngas Production from Biomass

Liu

Zhang

et al. 2022

Energy Fuels

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Herein, a coupled biomass torrefaction and chemical looping gasification (BTCLG) process was proposed, and process simulations were performed under autothermal conditions. The effects of operational parameters on product distribution with torrefaction temperatures from 240 to 300 °C, gasification temperatures from 700 to 880 °C, and steam/biomass (S/B) ratios from 0.5 to 1.5 were explored. The results showed that the process could stably operate under autothermal conditions. Torrefaction increased the syngas yield, heating value, and cold gas efficiency by 12.44, 5.11, and 36.73%, respectively. Moreover, it reduced the bed material circulation rate required for autothermal operation by 59.03%. At the torrefaction temperature of 240 °C, the syngas yield reached a maximum value of 0.78 Nm 3 /kg. Increases in the gasification temperature also positively impacted syngas production. However, the optimal gasification temperature was 810 °C based on the bed material circulation rate constraint. The syngas H 2 /CO ratio could be flexibly adjusted from 1.62 to 3.34 by changing the S/B ratio to meet downstream demands. Overall, the simulation results support the technical viability and demonstrate the excellent performance of the BTCLG process compared to the biomass CLG process.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance Evaluation of Torrefaction Coupled with a Chemical Looping Gasification Process under Autothermal Conditions: Flexible Syngas Production from Biomass

Liu

Zhang

et al. 2022

Energy Fuels

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“…Reducing the activation energy of the catalytic process helps to carry out a reaction at a relatively low temperature while increasing the reaction rate and providing high‐quality products 29,30 . However, there are few reports in the literature on the thermodynamic and kinetic analysis of methanol one‐step processes using a catalyst 31 . Most studies only explain the dynamics of the process, without emphasizing the formation of products 32,33 .…”

Section: Introductionmentioning

confidence: 99%

“…29,30 However, there are few reports in the literature on the thermodynamic and kinetic analysis of methanol one-step processes using a catalyst. 31 Most studies only explain the dynamics of the process, without emphasizing the formation of products. 32,33 Therefore, to better understand the reaction process, greater attention needs to be paid to the thermodynamic mechanism and product distribution.…”

Section: Introductionmentioning

confidence: 99%

One‐step synthesis of methylal via methanol oxidation: Reaction kinetics, mechanism, thermodynamics, and product analysis

Yuan

Sun

Tian

et al. 2022

Intl J of Energy Research

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Summary The recent abundance of methanol has made it an attractive raw material for chemical synthesis. This study conducts a thermodynamic analysis of the main and side reactions in a system where methanol is oxidized to methylal. A relationship between the thermodynamics and product distribution of this system is proposed. By studying the effect of reaction temperature on the catalytic activity of a Mo‐Fe/HZSM‐5 (80‐80) catalyst, the relationship between thermodynamic parameters and product distribution was further verified. Kinetic analysis of the one‐step process shows that a lower activation energy is one of the reasons for the higher catalytic activity of the iron‐molybdenum‐based bifunctional catalyst. Accordingly, it is proposed that all main and side reactions in this process are driven by two chemical adsorption reactions. The first occurs at active sites of iron and molybdenum oxidation on the catalyst surface. The adsorbed methanol and O2 obtain hydroxyl and methoxy groups linked to the iron molybdate. Subsequently, desorbed formaldehyde and methanol undergo a second chemical adsorption on the acidic active centres of the catalyst with surface carbonyl and hydroxyl groups, respectively. Formaldehyde and the adsorbed methoxy group are catalysed by the acidic sites to generate intermediates similar to the methoxy and methylene group structures. This study provides complete information on the thermodynamics, kinetics, and reaction mechanism of a one‐step process of producing methylal from methanol, thereby allowing optimization of this process.

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Carbon‐negative syngas production: A comprehensive assessment of biomass pyrolysis coupling chemical looping reforming

Liu,

Zhang,

Sun

et al. 2023

AIChE Journal

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This article introduces a pyrolysis chemical looping reforming (PCLR) process that produces carbon‐negative syngas in autothermal operation. To enhance the system's carbon negativity, a process configuration with oxygen carrier two‐stage regeneration is adopted, enabling internal CO2 utilization. The PCLR process is systematically evaluated and compared to chemical looping gasification and steam gasification processes in the process performance, energy efficiency, and environmental impact using a process model. Results reveal significant improvements over chemical looping gasification, including 69%, 45%, and 4% improvement in syngas yield, energy efficiency, and environmental benefit. Process analysis demonstrates that decoupling volatile reforming from pyrolysis and combustion enhances syngas quality, energy efficiency, and process flexibility. While the two‐stage regeneration sacrifices syngas production, it contributes to a 4% increase in carbon negativity and a 15% reduction in carbon emissions. Thus, the PCLR process effectively overcomes the limitations of chemical looping gasification systems and exhibits excellent process intensification performance.

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Thermodynamics and kinetics analysis from liquid chemical looping gasification of lignin with bismuth-based oxygen carrier

Cited by 14 publications

References 55 publications

Performance Evaluation of Torrefaction Coupled with a Chemical Looping Gasification Process under Autothermal Conditions: Flexible Syngas Production from Biomass

Performance Evaluation of Torrefaction Coupled with a Chemical Looping Gasification Process under Autothermal Conditions: Flexible Syngas Production from Biomass

One‐step synthesis of methylal via methanol oxidation: Reaction kinetics, mechanism, thermodynamics, and product analysis

Carbon‐negative syngas production: A comprehensive assessment of biomass pyrolysis coupling chemical looping reforming

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