Interconnected pyrolysis and gasification of typical biomass in a novel dual fluidized bed

Zhou, Chunbao; Chen, Lei; Liu, Chenglong; Wang, Jun; Xing, Xuyang; Liu, Yang; Chen, Yuanxiang; Li, Chao; Dai, Jianjun; Zhang, Yingwen; Yu, Mengyan; Yuan, Yanxin; Yao, Bang; Li, Yan

doi:10.1016/j.enconman.2022.116323

Cited by 19 publications

(5 citation statements)

References 56 publications

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“…The main features (versatility for using different types of biomass, high heat and mass transfer rates between phases, and bed isothermicity) of fluidized beds for biomass gasification have been well proven in large scale dual fluidized bed (DFB) reactors. The DFB consists of two interconnected fluidized bed reactors: one reactor is used for gasification, whereas the other one is used to produce the heat required for the gasification process through char combustion [31][32][33][34]. The heat generated is transported to the gasification chamber by circulating the bed material.…”

Section: Gasification Technologiesmentioning

confidence: 99%

A comprehensive review of primary strategies for tar removal in biomass gasification

Cortazar

López

Álvarez

et al. 2023

Energy Conversion and Management

153

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Section: Gasification Technologiesmentioning

confidence: 99%

A comprehensive review of primary strategies for tar removal in biomass gasification

Cortazar

López

Álvarez

et al. 2023

Energy Conversion and Management

153

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“…Aghaalikhani et al demonstrated that efficient gas–solid contact and heat and mass transfer in DFB significantly benefit hydrogen production via biomass steam gasification. Zhou et al demonstrated that the DFB is a promising technology for achieving a carbon-negative economy, focusing on its application in biomass utilization and carbon capture in their study. However, DFB systems are relatively complex, including two fluidized bed reactors and multiple circulation systems, which require higher engineering and operational costs.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Steam Gasification of Biomass in a 100 kW Dual Fluidized Bed Gasifier

Yang,

Hu,

Chen

et al. 2024

Energy Fuels

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The dual fluidized bed (DFB) shows great potential for the steam gasification of biomass to produce hydrogen. Understanding the hydrodynamics and thermochemical characteristics in a pilot-scale DFB system is crucial for optimizing the operating conditions and devising the reactor design. In this study, a three-dimensional model, based on the multiphase particle-in-cell (MP-PIC) method, is developed for a 100 kW biomass DFB system featuring a staged gasification reactor. The entire DFB system is simulated, with a focus on the gasification reaction in the gasifier reactor and ignoring the reactions in the combustion reactor. The basic simulation settings are optimized based on the pressure distribution observed in the cold experiment results. The optimized model correctly predicts the reactor temperature, pressure distribution, and gas production characteristics of the gasification process. Then, the effects of temperature, steam-to-biomass ratio (S/B), and gasification atmosphere on gasification performance are explored based on the verified model. It shows that the H 2 production and CO 2 production are increased together with an increasing H 2 /CO ratio with the increase of gasification temperature. With the increase of S/B, the yields of H 2 and CO 2 and the ratio of H 2 /CO first increase and then decrease. The optimal S/B for this DFB is 0.5, as excessive steam can lower the reaction temperature, which is unfavorable for gasification conversion. Changing the gasification agent from pure steam to a CO 2 /H 2 O mixture results in increased CO yield and a lower H 2 content because of the competition of CO/H 2 O gasification and water gas shift reactions. This study provides meaningful insights on biomass gasification with steam in a large-scale fluidized bed gasifier, and the findings are beneficial for designing and optimizing DFB, particularly in the context of staged gasification processes.

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“…Tobias Proll et al conducted a series of cold flow model experiments on a 1.8 m scaled DFB reactor, whose results showed that the system ran with high solids circulations between the two reactors, even at low bed inventories [10]. Chunbao Zhou et al designed and constructed a 4.0 m scaled DFB reactor and drew a conclusion that DFB is a promising system to achieve carbon negative economy, which deserves more research in the future [11]. Fangjun Wang et al carried out investigations on biomass gasification of 4.8 m scaled compact-fast dual fluidized bed calcium looping and reported that an increase of the solid circulation rate can improve the concentration and the yield of hydrogen, and decrease the content of tar [12].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on the Gas–Solid Flow Characteristics of a Large-Scale Dual Fluidized Bed Reactor: Verification and Extension

Lin,

Wang,

Xie

et al. 2024

Energies

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Dual fluidized bed (DFB) reactor systems are widely used in gas–solid two-phase flow applications, whose gas–solid flow characteristics have a significant effect on the performance of many kinds of technologies. A numerical simulation model was established on the basis of a large-scale DFB reactor with a maximum height of 21.6 m, and numerical simulations focused on gas–solid flow characteristics were carried out. The effects of the superficial gas velocity of both beds and the static bed height and particle size on the distribution of the pressure and solid suspension density and the solid circulation rate were studied. The simulation results were in good agreement with the experimental data. With the strong support of the experimental data, the gas–solid flow characteristics of large-scale DFB reactors were innovatively evaluated in this numerical simulation study, which effectively makes up for the shortcomings of the current research. The results showed that the superficial gas velocity of both beds and the static bed height have different degrees of influence on the gas–solid flow characteristics. Specifically, for 282 μm particles, when the superficial gas velocity of both beds and the static bed height were 4.5 m/s, 2.5 m/s, and 0.65 m, respectively, under typical working conditions, the bottom pressure of the two furnaces was 3412.42 Pa and 2812.86 Pa, respectively, and the solid suspension density was 409.44 kg/m3 and 427.89 kg/m3, respectively. Based on the simulation results, the empirical formulas of the solid circulation rate were fitted according to different particle sizes. Under similar conditions, the solid circulation rates of particles with a particle size of 100 μm, 282 μm, 641 μm, and 1000 μm were 2.84–13.28, 0.73–4.91, 0.024–0.216, and 0.0026–0.0095 kg/(m2s), respectively. It can be found that the influence of the particle size on the solid circulation rate is the most significant among all parameters.

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Interconnected pyrolysis and gasification of typical biomass in a novel dual fluidized bed

Cited by 19 publications

References 56 publications

A comprehensive review of primary strategies for tar removal in biomass gasification

A comprehensive review of primary strategies for tar removal in biomass gasification

Numerical Study on the Steam Gasification of Biomass in a 100 kW Dual Fluidized Bed Gasifier

Numerical Simulation Study on the Gas–Solid Flow Characteristics of a Large-Scale Dual Fluidized Bed Reactor: Verification and Extension

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