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首页> 外文期刊>World Journal of Nuclear Science and Technology >Establishing a Relationship between Coal Quality and the Enrichment of Radionuclides in Coal Combustion Residues
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Establishing a Relationship between Coal Quality and the Enrichment of Radionuclides in Coal Combustion Residues

机译：建立煤质与燃煤残渣中放射性核素富集的关系

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Coal-fired power plants (CFPP) provide approximately 40% of the world’s energy demand. Naturally occurring radioactive materials (NORM) contained in coal become enriched in coal combustion residues as a result of the elimination of carbon during combustion. The fly ash and bottom ash produced from CFPP may be significant sources of exposure to naturally occurring radionuclides for the population near the combustion plant or ash dumps. Despite this fact, very few studies have actually addressed the relationship of the NORM enrichment factors and the quality of coal used. This paper aims to relate the quality of coal to the enrichment factors for the radionuclides of interest (K~(40), Ra~(226), Th~(232) and Po~(210)) in coal combustion residues from three South African CFPP. The data from other CFPP was also taken into account to establish this correlation. The feedstock coal used in these CFPP is typically low quality, with ash content in the range of 25 - 45 wt%. The radionuclides investigated were determined by gamma spectrometry with the exception of Po~(210), which was determined by alpha spectrometry. The enrichment factors for the radionuclides of K~(40), Ra~(226), Th~(232) and Po~(210) in the fly ash and bottom ash (except Po~(210)) was found to be directly proportional to the quality of coal. That is when the ash percentage increased (coal quality decreased) the enrichment factor decreased. The Po~(210) radionuclide in the bottom ash had an enrichment factor less than one. The relationship between coal quality and enrichment factors for the radionuclides of K~(40), Ra~(226), Th~(232) and Po~(210 )in both the fly ash and bottom ash (except Po~(210) in the bottom ash) was demonstrated by the following mathematical equation: . This equation may be used as a good indication in obtaining an estimate in determining the enrichment of the mentioned radionuclides in coal combustion products such as fly ash and bottom ash.
机译：燃煤电厂（CFPP）提供了全球约40％的能源需求。由于燃烧过程中消除了碳，煤中所含的天然放射性物质（NORM）富含煤燃烧残留物。 CFPP产生的粉煤灰和底灰可能是燃烧厂或垃圾场附近人群暴露于自然产生的放射性核素的重要来源。尽管有这个事实，但很少有研究真正涉及到NORM富集因子与所用煤炭质量之间的关系。本文旨在将煤的质量与三个南方煤燃烧残渣中感兴趣的放射性核素（K〜（40），Ra〜（226），Th〜（232）和Po〜（210））的富集因子相关联。非洲CFPP。还考虑了来自其他CFPP的数据以建立这种相关性。这些CFPP中使用的原料煤通常质量低下，灰分含量在25-45 wt％的范围内。所研究的放射性核素通过伽马能谱法测定，Po（210）除外，后者通过α能谱法测定。发现粉煤灰和底灰（除了Po〜（210））中K〜（40），Ra〜（226），Th〜（232）和Po〜（210）的放射性核素的富集因子是直接的。与煤炭质量成正比。也就是说，当灰分百分比增加（煤质下降）时，富集系数下降。底灰中的Po〜（210）放射性核素的富集系数小于1。粉煤灰和底灰（Po〜（210）除外）中K〜（40），Ra〜（226），Th〜（232）和Po〜（210）的放射性核素的煤质与富集因子的关系由下面的数学方程式证明：在确定煤燃烧产物（如飞灰和底灰）中提到的放射性核素的富集时，该方程式可作为获得估算值的良好指示。

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