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首页> 外文期刊>International Journal of Heat and Mass Transfer >A full spectrum k-distribution based weighted-sum-of-gray-gases model for oxy-fuel combustion
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A full spectrum k-distribution based weighted-sum-of-gray-gases model for oxy-fuel combustion

机译：基于全谱k分布的氧气燃烧的灰色气体加权和模型

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摘要

Oxy-fuel combustion has become one of the most promising technologies for carbon capture and storage (CCS) in coal-fired plants. Radiative properties of combustion gases in oxy-fuel combustion are significantly different from those found in air-fired due to the change of the gas composition. A few modified weighted-sum-of-gray-gases (WSGG) models had been proposed to consider the wide H_2O to CO_2 ratio for oxy-fuel combustion in recent years. As most of the models are validated using simple homogenous benchmark, the applicability of such models to non-homogeneous media is questionable. In this paper, based on the up-to-date HITEMP 2010 database, we obtain new parameters of WSGG model for oxy-fuel combustion by combining the features of full-spectrum k-distribution (FSK) model with WSGG model, in which the weighting factors and absorption coefficients are directly obtained from the fc-distribution, and the polynomial expression of absorption coefficient is improved. The new parameters of WSGG model are extensively validated by comparing the radiative source terms and radiative heat fluxes, predicted with the line-by-line (LBL) model integration of HITEMP 2010 database at a one-dimensional slab system. The predictions by different parameters of WSGG model from the literature are also included in comparison. The investigative cases include the non-isothermal and/or non-homogeneous gas mixture. The maximum relative error of heat fluxes is 11.2% for the new parameters, 33.5% for Yin model (Yin et al., 2010) and 23.0% for Johansson model (Johansson et al., 2011) in non-isothermal non-homogeneous gas mixture. The results show the new parameters can significantly improve the prediction accuracy in non-isothermal non-homogeneous CO_2/H_2O mixture.
机译：含氧燃料燃烧已成为燃煤电厂中最有前途的碳捕集与封存技术之一。由于气体成分的变化，含氧燃料燃烧中的燃烧气体的辐射特性与空气燃烧时的气体的辐射特性显着不同。近年来，有人提出了一些改进的灰色气体加权总和（WSGG）模型来考虑氧燃料燃烧中广泛的H_2O与CO_2比率。由于大多数模型都使用简单的同质基准进行了验证，因此此类模型对非同质介质的适用性值得怀疑。本文在最新的HITEMP 2010数据库的基础上，结合全谱k分布（FSK）模型与WSGG模型的特征，获得了用于氧气燃料燃烧的WSGG模型的新参数，其中从fc分布直接获得加权因子和吸收系数，改进了吸收系数的多项式。通过比较辐射源项和辐射热通量（使用HITEMP 2010数据库的逐行（LBL）模型集成在一维平板系统上进行预测），广泛验证了WSGG模型的新参数。比较中还包括了来自文献的WSGG模型的不同参数的预测。调查案例包括非等温和/或非均质气体混合物。在非等温非均质气体中，新参数的热通量最大相对误差为11.2％，Yin模型（Yin等，2010）为33.5％，Johansson模型（Johansson等，2011）为23.0％。混合物。结果表明，新参数可以显着提高非等温非均匀CO_2 / H_2O混合物的预测精度。

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  • 作者

    Junjun Guo; Xiangyu Li; Xiaohong Huang; Zhaohui Liu; Chuguang Zheng;

  • 作者单位

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Oxy-fuel combustion; Radiative heat transfer; Weighed-sum-of-gray-gases model; k-Distribution;

    机译：含氧燃料燃烧;辐射换热;灰色气体加权总和模型;k分布;

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