CFD model of the coal carbonization process

Slupik, Lukasz; Fic, A.; Buliński, Zbigniew; Nowak, Andrzej J.; Kosyrczyk, L.; Łabojko, Grzegorz

doi:10.1016/j.fuel.2015.02.044

Cited by 38 publications

(4 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this model, the Euler–Euler multiphase approach is employed in the CFD model. The gas flow is treated as a laminar flow of ideal gas . According to the gas composition analyses in the experiment, 15 kinds of gas species are defined in this model for the involved homo- and heterogeneous chemical reactions.…”

Section: Model Detailsmentioning

confidence: 99%

“…With the development of computer technology, numerical modeling has emerged as an effective tool for understanding and optimizing complex reaction systems, including the pyrolysis of LRCs. − Some two-dimensional (2D) computational fluid dynamics (CFD) models were developed for describing the carbonization process in coke ovens. − In these models, fine coal bed was treated as a porous medium and the flow pattern and evolution of coke oven gas was investigated. Moreover, some multi-fluid models are developed to study the influence of operation conditions on coal pyrolysis and gasification processes .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Study of the Pyrolysis of Ellipsoidal Low-Rank Coal Briquettes

Zhuo

Wang

2018

Energy Fuels

View full text Add to dashboard Cite

Low-rank coal (LRC) upgrading is essential to convert LRC to a more thermal-efficient and environmentally friendly fuel before utilization in coal-based industries. Briquetting and pyrolysis are the dominant route, where briquettes are usually in the shape of an ellipsoid through a two-roll briquetting process. In this work, an integrated numerical model is developed to predict the pyrolysis process of ellipsoidal LRC briquettes in a packed-bed pyrolyzer. A computational fluid dynamics (CFD) model is developed to describe the flow and thermochemical behaviors related to the pyrolysis of ellipsoidal LRC briquettes, including dewatering, pyrolysis, and other homo-and heterogeneous chemical reactions. A discrete element method (DEM) model is used to describe the packing density distribution of ellipsoidal briquettes. The model is validated against the measurements in a pilot-scale test rig in terms of the temperature history and gas species yields. Typical in-furnace phenomena are illustrated, including flow field, temperature field, and product evolution. Then, the effects of key variables, including briquette properties and heating conditions, on the pyrolysis behavior are investigated quantitatively. The effects of key parameters, including briquette moisture, final pyrolysis temperature, and briquette aspect ratio, on pyrolysis are studied, and the optimal values are identified under the given conditions. For example, more H 2 and less CH 4 are generated when the moisture content of initial briquettes is increased in the range of 2−15%, but in the range of 15−20%, H 2 is then decreased and CH 4 is increased. The maximum packing density is obtained when the aspect ratio of briquettes is 2.0. However, the highest temperature increase rate is observed when the aspect ratio is 1.7. An appropriate final pyrolysis temperature, 973 K in this study, is suggested to balance the pyrolysis rate and energy consumption. This model provides a cost-effective tool for optimizing the design and operation of pyrolyzers for ellipsoidal LRC briquettes.

show abstract

Section: Model Detailsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Pyrolysis of Ellipsoidal Low-Rank Coal Briquettes

Zhuo

Wang

2018

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…All the related functions describing the temperature properties, heat transfer [16], kinetics of the volatile release, moisture evaporation, and vapor condensation [12] have been investigated by using ANSYS Fluent software [17].…”

Section: Computational Fluid Dynamics Heat Transfer Modelmentioning

confidence: 99%

Lignite temperature distribution during low temperature carbonization process in an industrial width carbonization furnace

Wang

Zhang

et al. 2016

Fuel Processing Technology

View full text Add to dashboard Cite

“…Barr et al (1994) and Osinski et al (1993aOsinski et al ( , 1993b) developed a two-dimensional integrated model for heat transfer and gas flow within the individual coke oven. The transient two-dimensional model of thermal and flow processes accounting for moisture evaporation, implemented in ANSYS Fluent, was studied lately by Słupik et al (2015). One of the latest works to be mentioned is the work by Jin et al (2013) in which a three-dimensional transient model for coupled coking and combustion chambers, developed to simulate transport phenomena using CFX code was presented.…”

Section: Introductionmentioning

confidence: 99%

Prediction of coking dynamics for wet coal charge

Kardaś¹,

Polesek-Karczewska²,

Ciżmiński³

et al. 2015

Chemical and Process Engineering

View full text Add to dashboard Cite

A one-dimensional transient mathematical model describing thermal and flow phenomena during coal coking in an oven chamber was studied in the paper. It also accounts for heat conduction in the ceramic oven wall when assuming a constant temperature at the heating channel side. The model was solved numerically using partly implicit methods for gas flow and heat transfer problems. The histories of temperature, gas evolution and internal pressure were presented and analysed. The theoretical predictions of temperature change in the centre plane of the coke oven were compared with industrialscale measurements. Both, the experimental data and obtained numerical results show that moisture content determines the coking process dynamics, lagging the temperature increase above the water steam evaporation temperature and in consequence the total coking time. The phenomenon of internal pressure generation in the context of overlapping effects of simultaneously occurring coal transitions -devolatilisation and coal permeability decrease under plastic stage -was also discussed.

show abstract

CFD model of the coal carbonization process

Cited by 38 publications

References 12 publications

Numerical Study of the Pyrolysis of Ellipsoidal Low-Rank Coal Briquettes

Numerical Study of the Pyrolysis of Ellipsoidal Low-Rank Coal Briquettes

Lignite temperature distribution during low temperature carbonization process in an industrial width carbonization furnace

Prediction of coking dynamics for wet coal charge

Contact Info

Product

Resources

About