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首页> 外文期刊>Journal of the air & waste management association >Characteristics of particle emissions and their atmospheric dilution during co-combustion of coal and wood pellets in a large combined heat and power plant
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Characteristics of particle emissions and their atmospheric dilution during co-combustion of coal and wood pellets in a large combined heat and power plant

机译：大型热电厂联合燃烧煤和木屑颗粒过程中颗粒物排放及其大气稀释的特征

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摘要

Coal combustion is one of the most significant anthropogenic CO2 and air pollution sources globally. This paper studies the atmospheric emissions of a power plant fuelled with a mixture of industrial pellets (10.5%) and coal (89.5%). Based on the stack measurements, the solid particle number emission, which was dominated by sub-200 nm particles, was 3.4x10(11) MJ(-1) for the fuel mixture when electrostatic precipitator (ESP) was cleaning the flue gas. The emission factor was 50 mg MJ(-1) for particulate mass and 11 740 ng MJ(-1) for the black carbon with the ESP. In the normal operation situation of the power plant, i.e., including the flue-gas desulphurisation and fabric filters (FGD and FF), the particle number emission factor was 1.7x10(8) MJ(-1), particulate mass emission factor 2 mg MJ(-1) and black carbon emission factor 14 ng MJ(-1). Transmission electron microscopy (TEM) analysis supported the particle number size distribution measurement in terms of particle size and the black carbon concentration. The TEM images of the particles showed variability of the particle sizes, morphologies and chemical compositions. The atmospheric measurements, conducted in the flue-gas plume, showed that the flue-gas dilutes closed to background concentrations in 200 sec. However, an increase in particle number concentration was observed when the flue gas aged. This increase in particle number concentration was interpret as formation of new particles in the atmosphere. In general, the study highlights the importance of detailed particle measurements when utilizing new fuels in existing power plants. Implications: CO2 emissions of energy production decrease when substituting coal with biofuels. The effects of fuels changes on particle emission characteristics have not been studied comprehensively. In this study conducted for a real-scale power plant, co-combustion of wood pellets and coal caused elevated black carbon emissions. However, it was beneficial from the total particle number and particulate mass emission point of view. Flue-gas cleaning can significantly decrease the pollutant concentrations but also changes the characteristics of emitted particles. Atmospheric measurements implicated that the new particle formation in the atmospheric flue-gas plume should be taken into account when evaluating all effects of fuel changes." Are implication statements part of the manuscript?
机译：煤炭燃烧是全球最重要的人为二氧化碳和空气污染源之一。本文研究了以工业颗粒（10.5％）和煤炭（89.5％）的混合物为燃料的发电厂的大气排放。根据烟囱的测量，当静电除尘器（ESP）清洁烟道气时，燃料混合物的固体颗粒数发射主要由低于200 nm的颗粒控制，为3.4x10（11）MJ（-1）。对于ESP，颗粒物的排放因子是50 mg MJ（-1），黑碳的排放因子是11740 ng MJ（-1）。在发电厂的正常运行情况下，包括烟气脱硫和织物过滤器（FGD和FF），颗粒数排放因子为1.7x10（8）MJ（-1），颗粒物质排放因子为2 mg MJ（-1）和黑碳排放因子14 ng MJ（-1）。透射电子显微镜（TEM）分析支持就粒度和黑碳浓度进行粒度分布测量。颗粒的TEM图像显示出粒径，形态和化学组成的变化。在烟气羽流中进行的大气测量表明，烟气稀释液在200秒内接近背景浓度。然而，当烟道气老化时，观察到颗粒数浓度的增加。颗粒数量浓度的这种增加被解释为大气中新颗粒的形成。总的来说，这项研究强调了在现有电厂中使用新燃料时进行详细颗粒测量的重要性。含义：用生物燃料代替煤炭后，能源生产的二氧化碳排放量减少。燃料变化对颗粒物排放特性的影响尚未得到全面研究。在针对大型发电厂进行的这项研究中，木屑颗粒和煤炭的共燃导致黑碳排放量增加。但是，从总颗粒数和颗粒质量排放的角度来看，这是有益的。烟气清洁可以显着降低污染物浓度，但也可以改变排放颗粒的特性。大气测量表明，在评估燃料变化的所有影响时，应考虑到大气烟气羽流中新的颗粒形成。“含义说明是否为手稿的一部分？

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