Cadmium concentrations in coals and fly ashes from coal fired thermoelectric power plants in Bulgaria

IF 0.2 Q4 GEOSCIENCES, MULTIDISCIPLINARY
I. Kostova, Ralica Sabeva, Gergana Velyanova, Elena Isaeva
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引用次数: 0

Abstract

The goal of the present study is to present new data regarding concentration and distribution of Cd in feed coals and fly ashes from seven Bulgarian coal fired thermoelectric power plans (TPPs). The study was performed on feed coals and fly ashes collected from Maritza East 2, Maritza East 3, Maritza 3, Republika, Bobov Dol, Varna and Russe TPPs. Bulk fly ash from Maritza East 2 and Maritza East 3 TPPs were obtained and fly ashes from each row of electrostatic precipitators (ESPs) of Maritza 3, Republika, Bobov Dol, Varna and Russe TPPs were also collected. Feed coals from bunkers were sampled at each TPPs. The Cd was determined by using ICP-MS. The present investigation shows that the concentration of Cd in studied coal and fly ashes from almost all TPPs is around the average or lower than Cd content in comparison with Clark values. The exceptions are the fly ashes from the 2-nd and 3-rd row of ESPs from Maritza 3 TPP, where up to 2.5 times higher Cd content was registered. This study shows that Cd concentration in fly ashes gradually increases from the 1st to 3rd and 5th-row of ESP from almost all sampled thermoelectric power plants, whence the conclusion that Cd content increases significantly and is mainly concentrated in the finest fly ash particles.
保加利亚燃煤热电厂煤和飞灰中的镉浓度
本研究的目的是提供有关保加利亚七个燃煤热电计划(TPPs)的原料煤和飞灰中Cd的浓度和分布的新数据。研究对象为Maritza East 2、Maritza East 3、Maritza 3、Republika、Bobov Dol、Varna和Russe电厂的煤和粉煤灰。收集了Maritza East 2和Maritza East 3电厂的散装粉煤灰,并收集了Maritza 3电厂、Republika电厂、Bobov Dol电厂、Varna电厂和Russe电厂各排静电除尘器的粉煤灰。在各试验点取样了地堡的煤。Cd采用ICP-MS测定。本研究表明,与克拉克值相比,几乎所有电厂的煤和飞灰中的Cd含量都在平均水平左右或低于Cd含量。例外的是Maritza 3 TPP的第二排和第三排esp的飞灰,其Cd含量高达2.5倍。本研究表明,几乎所有热电厂的煤灰中Cd浓度从第1排到第3排和第5排逐渐升高,由此得出Cd含量明显升高且主要集中在最细的粉煤灰颗粒中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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