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首页> 外文期刊>International Journal of Coal Geology >Assessment of elemental content of milled coal, combustion residues, and stack emitted materials: Possible environmental effects for a Canadian pulverized coal-fired power plant
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Assessment of elemental content of milled coal, combustion residues, and stack emitted materials: Possible environmental effects for a Canadian pulverized coal-fired power plant

机译：磨煤，燃烧残留物和烟囱排放物质的元素含量评估：加拿大粉煤电厂的可能环境影响

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Two monitoring studies were earned out at four-year intervals on a power plant that uses western Canadian subbituminous coal and generates approximately 800 Mw/h of electricity. The distributions of elements of environment concern (As, Hg, Ni, Pb, and Cd) and elements of environmental interest (B, Ba, Be, Cl, Co, Cr, Cu, Mn, Mo, Th, Se, V, U, and Zn) in milled coals, power plant ashes, and emitted materials from the stack were determined using neutron activation analysis (NAA), Inductively Coupled Plasma Emission Spectroscopy (ICPES), and Inductively Coupled Plasma-Mass spectroscopy (ICP-MS) for most elements, Graphite Furnace Atomic Absorption (GFAA) for Pb, and Cold Vapor Atomic Absorption (CVAA) for Hg. The concentrations of most of elements in milled coal are low as compared to world coals and other Canadian milled coals. For example, in both studies mercury is within the lower range of world coal. Bottom ashes from both studies have low concentrations of As, Cd, Hg, Pb, and Zn, as well as low relative enrichment factors (RE) for the same elements, indicating that they were not enriched in the bottom ash. The ESP's remove most of the elements of environmental interest as indicated by their high RE ratios of greater than >0.7. The rates of input of elements of environmental concern (As, Cd, Hg, Pb and Ni) for this station were 23.65, 1.24, 0.54, 98.2 and 95.2 kg/day, respectively, of which only 0.20, 0.02, 0.31, 0.48 and 0.36 kg/day were emitted from the stack. Thus only a small amount of these elements found in the milled coal was emitted while most were captured in the bottom and the ESP ashes. Nickel has the highest rate of emission (0.48 kg/day) within the elements of environmental concern group. However, the Ni emitted from this station does not belong to the toxic species. The element with the lowest rate of emission is Cd (0.02 kg/day). The total emission of elements of environmental concern is 1.37 kg/day, which is low as compared their ambient concentrations in either rural or urban air. The total rate of emission of B, Ba, Be, Co, Cr, Cu, Mn, Mo, Se, Th, U, V, and Zn is 56.51 kg/day and is mostly comprised of the total emission of Ba (21.73 kg/day) and Zn (19.14 kg/day).
机译：每四年一次，对使用加拿大西部次烟煤并发电约800 Mw / h的发电厂进行了两项监测研究。环境关注元素（As，Hg，Ni，Pb和Cd）和环境关注元素（B，Ba，Be，Cl，Co，Cr，Cu，Mn，Mo，Th，Se，V，U的分布使用中子活化分析（NAA），电感耦合等离子体发射光谱法（ICPES）和电感耦合等离子体质谱法（ICP-MS）测定磨煤，电厂烟灰和烟囱中散发的物料中的Zn和Zn）大多数元素是铅的石墨炉原子吸收（GFAA），汞是冷蒸气原子吸收（CVAA）。与世界煤和其他加拿大煤相比，煤中大多数元素的浓度较低。例如，在两项研究中，汞都在世界煤炭的较低范围内。两项研究的底灰均具有低浓度的As，Cd，Hg，Pb和Zn，以及相同元素的相对富集系数（RE）低，表明它们未富集于底灰中。 ESP去除了大多数对环境有益的元素，如其高RE比率大于> 0.7所示。该站的环境关注元素（砷，镉，汞，铅和镍）的输入速率分别为每天23.65、1.24、0.54、98.2和95.2千克/天，其中只有0.20、0.02、0.31、0.48和烟囱每天排放0.36公斤。因此，仅在磨煤中发现的这些元素中的一小部分被排放掉，而大多数元素被捕集在底部和ESP灰中。在环境关注组中，镍的排放率最高（0.48 kg /天）。但是，从该站排放的镍不属于有毒物质。排放率最低的元素是Cd（0.02千克/天）。与环境有关的元素的总排放量为1.37千克/天，与农村或城市空气中的环境浓度相比较低。 B，Ba，Be，Co，Cr，Cu，Mn，Mo，Se，Th，U，V和Zn的总排放量为56.51 kg /天，主要由Ba的总排放量（21.73 kg /天）和锌（19.14公斤/天）。

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