Numerical simulation on the reaction characteristics of a coal-water slurry particle during entrained-flow gasification process

IF 4.7 2区材料科学 Q2 ENGINEERING, CHEMICAL

Particuology Pub Date : 2026-01-01 Epub Date: 2025-11-26 DOI:10.1016/j.partic.2025.11.012

Yan Gong , Bo Zhao , Wenjing Zhao , Xuning Wang , Qinghua Guo , Yifei Wang , Jin Bai , Guangsuo Yu

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Abstract

Gasification technology serves as the cornerstone of the modern coal chemical industry. High-temperature particles in entrained-flow gasifiers act as the primary reaction medium, whose reactivity is inherently dependent on particle size, porosity, and local reaction environment. Current experimental investigations on particles within gasifiers predominantly rely on visualization systems, yet face significant challenges in precise particle tracking and quantitative analysis, particularly in diagnosing volatile release processes. This study employed computational fluid dynamics (CFD) numerical simulations to develop a multiphase model to isolate single particle behavior from bulk particle group during coupled combustion-gasification process of coal-water slurry (CWS). Discrete coal particle models with varying configurations were developed to compare reaction characteristics between isolated and interacting particles, while analyzing temperature fields and reaction rate distributions across three porosity levels. Verification demonstrated that the implemented models effectively described the reaction characteristics of coal particles. Results reveal strong correlation between the temperature field distribution and the volatile molar fraction in CWS particle, with H₂, H₂O, and CO accumulation observed at particle cores. Coupling effects of heat and mass transfer between particles significantly influence reaction rates and thermal profiles, governed by the particle spacing and heat/mass transfer efficiency, whereas the effects of porosity remain relatively minor.

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带流气化过程中水煤浆颗粒反应特性的数值模拟

气化技术是现代煤化工的基石。带流气化炉中的高温颗粒是主要的反应介质，其反应活性本质上取决于颗粒的大小、孔隙率和局部反应环境。目前对气化炉内颗粒的实验研究主要依赖于可视化系统，但在精确的颗粒跟踪和定量分析方面面临着重大挑战，特别是在诊断挥发性释放过程方面。本文采用计算流体力学（CFD）数值模拟方法，建立了分离水煤浆燃烧-气化耦合过程中单颗粒行为和体颗粒群行为的多相模型。建立了具有不同结构的离散煤颗粒模型，以比较分离颗粒和相互作用颗粒之间的反应特性，同时分析了三种孔隙度水平下的温度场和反应速率分布。验证表明，所实现的模型有效地描述了煤颗粒的反应特性。结果表明，温度场分布与水煤浆颗粒的挥发性摩尔分数有较强的相关性，颗粒核心处有H2、H2O和CO的积累。颗粒之间的传热传质耦合效应显著影响反应速率和热剖面，受颗粒间距和传热传质效率的控制，而孔隙度的影响相对较小。

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来源期刊

Particuology 工程技术-材料科学：综合

CiteScore

6.70

自引率

2.90%

发文量

1730

审稿时长

32 days

期刊介绍： The word ‘particuology’ was coined to parallel the discipline for the science and technology of particles. Particuology is an interdisciplinary journal that publishes frontier research articles and critical reviews on the discovery, formulation and engineering of particulate materials, processes and systems. It especially welcomes contributions utilising advanced theoretical, modelling and measurement methods to enable the discovery and creation of new particulate materials, and the manufacturing of functional particulate-based products, such as sensors. Papers are handled by Thematic Editors who oversee contributions from specific subject fields. These fields are classified into: Particle Synthesis and Modification; Particle Characterization and Measurement; Granular Systems and Bulk Solids Technology; Fluidization and Particle-Fluid Systems; Aerosols; and Applications of Particle Technology. Key topics concerning the creation and processing of particulates include: -Modelling and simulation of particle formation, collective behaviour of particles and systems for particle production over a broad spectrum of length scales -Mining of experimental data for particle synthesis and surface properties to facilitate the creation of new materials and processes -Particle design and preparation including controlled response and sensing functionalities in formation, delivery systems and biological systems, etc. -Experimental and computational methods for visualization and analysis of particulate system. These topics are broadly relevant to the production of materials, pharmaceuticals and food, and to the conversion of energy resources to fuels and protection of the environment.