Numerical analysis of gasification and emission characteristics of a two-stage entrained flow gasifier

Zhang, Bo; Ren, Zhuyin; Shi, Shaoping; Yan, Suying; Fang, Fang

doi:10.1016/j.ces.2016.06.021

Cited by 19 publications

(14 citation statements)

References 41 publications

(48 reference statements)

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“…This design simplifies the heat recovery process, increases the cold gasification efficiency, and lowers both specific coal consumption and specific oxygen consumption due to the chemical quench process by recovering sensible heat of hot gas from the first stage. [1] Although progress on the IGCC gasifier operation has been made, [2][3][4][5] this technology is still in the trial operation stage. Thus, further research on the optimization of the current operating practises is required for broader deployment of this technology.…”

Section: Introductionmentioning

confidence: 99%

“…Much work has been done on coal pyrolysis and gasification in fluidized beds [6][7][8][9] and entrained-flow gasifiers. [1][2][3][4][10][11][12][13] The effects of coal type and operating conditions (temperature, pressure, and gasify agencies) on gasification reactivity have been extensively investigated, and the particle size has also been found to significantly influence the ignition and thermal history of coal particle, and consequently the flame distribution and gasification characteristics. [14] Experimental studies using thermogravimetric analyzers have shown that the heating and devolatilization processes with fine particles commenced early and rapidly because of the increased specific surface area with decreased particle size.…”

Section: Introductionmentioning

confidence: 99%

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Effect of coal particle size on gasification performance of two‐stage entrained‐flow coal gasifier

Fan

Yinhe

et al. 2021

Can J Chem Eng

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To clarify the effect of coal particle sizes on gasification performance of an advanced two-stage entrained-flow coal gasifier for IGCC (integrated gasification combined cycle) application, a comprehensive three-dimensional numerical model is established by incorporating the shrinking core model combined with the Langmuir-Hinshelwood kinetic rate expression, which considers the inhibitory effect of CO on char-CO 2 reaction. The flow, temperature, and species distributions were obtained, and the results are consistent with the operating data. Results show that the helical flow and eight recirculation zones in the gasifier improve carbon conversion efficiency through extending the residence time of coal particles. Slow devolatilization of large particles caused by slow heating retards volatiles combustion, and thus char combustion and gasification. As a result, less char gasification and higher gas temperature appear in the injection region of the first stage. Higher inertia of larger particles produces higher slip velocity, which enhances heat transfer and mass diffusion to char particles and increases char consumption rate in diffusionlimited regions. The regions of high inner wall temperature spread from locations around burners to the whole inner wall of the injection and bottom regions in the first stage with increase of coal particle sizes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of coal particle size on gasification performance of two‐stage entrained‐flow coal gasifier

Fan

Yinhe

et al. 2021

Can J Chem Eng

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“…Gasification is an extremely complex process to engage given the interplay of several involved phenomena such as hydrodynamics, mass transfer, momentum, energy balance, and chemical reactions . In addition to the gasifying agent, syngas composition also relies upon many other different interconnected factors namely bed temperature, steam ratio, equivalence ratio, moisture level, feedstock size, and chemical composition, among others . Therefore, experimental investigation carries great importance to understand the different entangled phenomena and operational parameters involved in the gasification process while assessing the optimal operating conditions and how these affect the gasifier's performance and syngas composition.…”

Section: Introductionmentioning

confidence: 99%

“…16 In addition to the gasifying agent, syngas composition also relies upon many other different interconnected factors namely bed temperature, steam ratio, equivalence ratio, moisture level, feedstock size, and chemical composition, among others. 19 Therefore, experimental investigation carries great importance to understand the different entangled phenomena and operational parameters involved in the gasification process while assessing the optimal operating conditions and how these affect the gasifier's performance and syngas composition. Given the intricate nature and the numerous factors participating in the gasification process, employing a conventional one-factor-at-a-time (OFAT) experiment approach requires both strenuous and time-consuming experimentation, neglecting multiple-factor interactions while being unfit to guarantee optimum method conditions.…”

Section: Introductionmentioning

confidence: 99%

Process optimization and robustness analysis of municipal solid waste gasification using air‐carbon dioxide mixtures as gasifying agent

2019

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Summary In this work, a computational fluid dynamics (CFD) model was coupled with an advanced statistical strategy combining design of experiments (DoE) and the Monte Carlo method to comparatively optimize and test the robustness of two municipal solid waste (MSW) gasification processes one using air‐carbon dioxide (CO2) mixtures as a gasifying agent and the other using air alone. A 3k full factorial design of 18 computer simulations was performed using as input factors for air‐CO2 mixtures the equivalence ratio and CO2‐to‐MSW ratio, while MSW feeding rate and air flow rate were used for air gasification. The selected responses were CO2, H2, CO, and CnHm generation, CH4/H2 and H2/CO ratios, carbon conversion, and cold gas efficiency (CGE). Findings were that DoE allowed determining the best‐operating conditions to achieve optimal syngas quality. Monte Carlo identified the best‐operating conditions reaching a more stable high‐quality syngas. Air‐CO2 mixture gasification showed enhanced responses with major improvements in CO2 conversion and CGE, both up to a 13% increase. The optimal operating conditions that set the optimized responses showed to not always imply the most stable set of values to operate the system. Finally, this combined optimization process performance revealed to grant professionals the ability to make smarter decisions in an industrial environment.

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“…Solid fuel gasification is realized in reactors with gaseous oxidizer feed. The main chemical reactions are heterogeneous interaction of carbon in solid phase with oxygen, carbon dioxide and steam resulted in carbon monoxide, hydrogen and carbon dioxide formation [4]. Modern gasification technologies apply a two-stage approach where oxidation and reduction reactions take place in different chambers of a gasifier [5].…”

Section: Introductionmentioning

confidence: 99%

Coal char oxidation kinetics in air medium

Slyusarskiy¹,

Jankovskiy²,

Коротких³

et al. 2017

AIP Conference Proceedings

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Abstract.Research on oxidation in air medium process of three different coal chars with various carbon content was presented. The anthracite, T-grade bituminous coal and 2B-grade lignite char powders with particle size less than 80 μm were studied. The coal char oxidation was studied by isothermal method using coupled TG-DSC analyzer Netzsch STA 449 Jupiter F3 in the temperature range 1000-1200 °С. Experiments were carried out at ambient pressure. Volumetric flow rate of oxidation medium into analyzer chamber was 250 ml/min and consisted of oxygen and argon with volumetric ratio 24:1. Based on experimental data, the average rate of carbon oxidation reaction values were defined at each temperature. Kinetic constants (frequency factor and activation energy) of reaction were defined as well via 1 st order Arrhenius equation. Activation energy values are in good agreement with the data presented in the literature. Activation energy values for anthracite char are 1.6-1.7 times higher than those for bituminous coal and lignite chars, respectively.

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Numerical analysis of gasification and emission characteristics of a two-stage entrained flow gasifier

Cited by 19 publications

References 41 publications

Effect of coal particle size on gasification performance of two‐stage entrained‐flow coal gasifier

Effect of coal particle size on gasification performance of two‐stage entrained‐flow coal gasifier

Process optimization and robustness analysis of municipal solid waste gasification using air‐carbon dioxide mixtures as gasifying agent

Coal char oxidation kinetics in air medium

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