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首页> 外文期刊>Environmental Science & Technology >Electrostatic precipitator performance and trace element emissions from two Kraft recovery boilers
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Electrostatic precipitator performance and trace element emissions from two Kraft recovery boilers

机译：两台硫酸盐回收锅炉的静电除尘器性能和微量元素排放

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Fine particle emissions from combustion sources have gained attention recently due to their adverse effects on human health. The emission depends on the combustion process, fuel, and particulate removal technology. Particle concentrations at Kraft recovery boiler exits are very high, and the boilers are typically equipped with electrostatic precipitators (ESP). However, little data are available on the ESP performance in recovery boilers. Particle concentrations and size distributions were determined at two modern, operating recovery boilers. In addition, we determined the fractional collection efficiency of the ESPs by simultaneous measurements at the ESP inlet and outlet and the particulate emissions of trace metals. The particle mass concentration at the ESP inlet was 11-24 g/Nm(3) at the two boilers. Particle emissions were 30-40 mg/ Nm(3) at boiler A and 12-15 mg/Nm(3) at boiler B. The particle size distributions had a major particle mode at around 1 mu m. These fume particles contained most of the particle mass. The main components in the particles were sodium and sulfate with minor amounts of chloride, potassium, and presumably some carbonate. The ESP collection efficiency was 99.6-99.8% at boiler A and 99.9% at boiler B. The particle penetration through the ESP was below 0.6% in the entire fume particle size range of 0.3-3 mu m. Trace element emissions from both boilers were well below the limit values set by EU directive for waste incineration.
机译：来自燃烧源的细颗粒物排放由于其对人体健康的不利影响而近来受到关注。排放取决于燃烧过程，燃料和微粒清除技术。卡夫回收锅炉出口处的颗粒物浓度非常高，并且锅炉通常配备有静电除尘器（ESP）。但是，关于回收锅炉中ESP性能的数据很少。在两个现代的，运行中的回收锅炉中确定了颗粒浓度和粒度分布。此外，我们通过同时测量ESP入口和出口以及痕量金属的微粒排放来确定ESP的部分收集效率。在两个锅炉中，ESP入口处的颗粒质量浓度为11-24 g / Nm（3）。锅炉A处的颗粒排放量为30-40 mg / Nm（3），锅炉B处的颗粒排放量为12-15 mg / Nm（3）。粒径​​分布的主要颗粒模式为1微米左右。这些烟雾颗粒包含大部分颗粒质量。颗粒中的主要成分是钠和硫酸钠，以及少量的氯，钾和大概的碳酸盐。在锅炉A处，ESP的收集效率为99.6-99.8％，在锅炉B处为99.9％。在整个烟尘粒径范围0.3-3微米范围内，通过ESP的颗粒渗透率均低于0.6％。两台锅炉的痕量元素排放量均远低于欧盟指令规定的废物焚烧极限值。

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