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Investigation on thermal radiation spectra of coal ash deposits

机译:煤灰沉积物的热辐射光谱研究

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This paper deals with thermal radiation properties of ash deposits on a pulverized coal boiler of an electric power plant. Normal emittance spectra in the 2.5-25 μm interval, and total normal emittance, were measured on 4 kinds of ash layers of a mm magnitude order thickness, at 560 → 1460 → 560 K in heating and cooling. It was found that ash powder layers are opaque for infrared radiation. The emittance increases with ash radiation wavelength and temperature. Ash powder is sintered and fused above 1200 K. The emittance of the sintered layer is above that of the unsintered layer. The authors propose, and explain by an example, correlating the experimentally obtained emittance spectra of ash deposits with a continuous curve, the formula of which defines the dependence of emittance on wavelength and temperature, i.e.ε = ε(λ,T). Use of this formula, with parameter values determined by the proposed methodology, may greatly simplify the practical application of the experimentally determined emit-tances in the thermal design of existing and new steam boiler furnaces.
机译:本文探讨了电厂粉煤锅炉中灰渣沉积物的热辐射特性。在560→1460→560 K的加热和冷却条件下,在4种毫米级量级厚度的灰层上,以2.5-25μm的间隔测量正常发射光谱和总正常发射。发现灰粉层对于红外辐射是不透明的。发射率随灰分辐射波长和温度而增加。在1200 K以上烧结并熔化灰烬粉末。烧结层的发射率高于未烧结层的发射率。作者提出并举例说明,将通过实验获得的灰烬沉积物的发射光谱与连续曲线相关联,该公式的公式定义了发射率对波长和温度的依赖性,即ε=ε(λ,T)。使用由建议的方法确定的参数值的该公式可以大大简化在现有和新型蒸汽锅炉炉的热设计中实验确定的发射率的实际应用。

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