燃烧煤层的辐射率与煤灰形成和露水凝结的关系

0 ENGINEERING, MECHANICAL
Hakduck Kim, Seungtaek Lee, Heechang Lim, Juhun Song
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引用次数: 0

摘要

在这项研究中,使用干燥和加湿系统制备了不同含水量的煤样。将煤样放入坩埚中,使用加热丝点燃,并在煤燃烧过程中通电。使用窄角辐射计测量了三种含水量(0、20 和 50%)煤样在三种温度(10、25 和 50 °C)下的燃烧辐射率。建立了一个数值模拟模型来预测煤层在一维平面板上燃烧时的非稳定辐射特性。采用半隐式 Runge-Kutta 法和离散序数法求解了非稳态能量平衡方程和辐射传递方程。此外,还研究了露水凝结对辐射度的影响。在高水分煤燃烧过程中,观察到辐射度降低最大。此外,还研究了灰(由煤转化而来)对辐射度的影响。结果表明,在煤燃烧成灰的过程中,光学特性的某些变化会改变吸收和各向异性散射,从而改变燃烧过程中的辐射度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dependence of Radiance of Burning Coal Bed On Ash Formation and Dew Condensation
In this study, coal samples with different moisture contents were prepared using a drying and humidification system. Coal samples were placed in a crucible and ignited using a heating wire, to which power was applied during coal combustion. The combustion radiance of coal samples with three moisture contents (0, 20, and 50%) was measured using a narrow-angle radiometer at three temperatures (10, 25, and 50 °C). A numerical simulation model was developed to predict the unsteady radiation characteristics of a coal layer burning on one-dimensional planar plates. The unsteady energy balance equation and radiative transfer equation were solved using the semi-implicit Runge-Kutta method and discrete ordinates method. In addition, the effect of dew condensation on the radiance was investigated. The greatest reduction in radiance was observed during the burning of the high-moisture coal. Furthermore, the effect of ash (converted from coal) on radiance was examined. The results demonstrated that certain changes in the optical properties during the burning of coal to ash can alter the absorption as well as anisotropic scattering, and thereby the radiance, as combustion proceeds.
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CiteScore
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