Coal combustion modeling: A comparative study

IF 3.5 3区 工程技术 Q3 ENERGY & FUELS
Lethukuthula N. Vilakazi, Daniel Madyira
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引用次数: 0

Abstract

Coal combustion is a major power source in the world, and energy conservation and environmental protection are now the top priorities in terms of carrying out the strategy for continuous and persistent development in power generation. The intricate coal combustion process must be investigated to present the process inside a live boiler as accurately as possible. In this study, the ANSYS FLUENT program is used to compare two species models namely, species transport (STM) and nonpremixed model (NPM). The two models are run with similar geometry and boundary conditions. It was found that the STM enables entering of the species reactions and activates a selection for the crucial coal combustion and devolatization processes. The NPM combustion process takes place with the assumption that combustion is in equilibrium, a Probability Density Function (PDF) mixture table is calculated first before the simulation can be run. Both submodels can depict the combustion process for a CFPP boiler providing temperature gradients within the boiler with species composition throughout the boiler. The NPM does not track species individually through the boiler, limiting model validation data. The STM was found to be suitable since it provided more comprehensive coal combustion results, that can be used for model validation.

Abstract Image

煤炭燃烧模型:比较研究
燃煤是世界上的主要能源,节能和环保是当前实施持续、持久发展发电战略的重中之重。必须对错综复杂的煤炭燃烧过程进行研究,以尽可能准确地呈现锅炉内部的燃烧过程。本研究使用 ANSYS FLUENT 程序来比较两个物种模型,即物种传输模型(STM)和非预混模型(NPM)。这两个模型在相似的几何形状和边界条件下运行。结果发现,STM 可以输入物种反应,并对关键的煤炭燃烧和脱灰过程进行选择。NPM 燃烧过程假定燃烧处于平衡状态,在模拟运行之前首先计算概率密度函数 (PDF) 混合表。这两个子模型都可以描述 CFPP 锅炉的燃烧过程,提供锅炉内的温度梯度和整个锅炉内的物种组成。NPM 无法单独跟踪锅炉内的物种,因此限制了模型验证数据。STM 被认为是合适的,因为它提供了更全面的煤炭燃烧结果,可用于模型验证。
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来源期刊
Energy Science & Engineering
Energy Science & Engineering Engineering-Safety, Risk, Reliability and Quality
CiteScore
6.80
自引率
7.90%
发文量
298
审稿时长
11 weeks
期刊介绍: Energy Science & Engineering is a peer reviewed, open access journal dedicated to fundamental and applied research on energy and supply and use. Published as a co-operative venture of Wiley and SCI (Society of Chemical Industry), the journal offers authors a fast route to publication and the ability to share their research with the widest possible audience of scientists, professionals and other interested people across the globe. Securing an affordable and low carbon energy supply is a critical challenge of the 21st century and the solutions will require collaboration between scientists and engineers worldwide. This new journal aims to facilitate collaboration and spark innovation in energy research and development. Due to the importance of this topic to society and economic development the journal will give priority to quality research papers that are accessible to a broad readership and discuss sustainable, state-of-the art approaches to shaping the future of energy. This multidisciplinary journal will appeal to all researchers and professionals working in any area of energy in academia, industry or government, including scientists, engineers, consultants, policy-makers, government officials, economists and corporate organisations.
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