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首页> 外文期刊>Fuel Processing Technology >Comparison of the characteristics of bottom ash and fly ash from a medium-size (32 MW) municipal district heating plant incinerating forest residues and peat in a fluidized-bed boiler
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Comparison of the characteristics of bottom ash and fly ash from a medium-size (32 MW) municipal district heating plant incinerating forest residues and peat in a fluidized-bed boiler

机译：中型（32兆瓦）市政集中供热厂焚烧流化床锅炉中森林残留物和泥炭的底灰和粉煤灰的特性比较

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摘要

In this study, the physical and chemical properties of bottom ash and fly ash originating from the co-combustion of biomass-derived fuels (i.e. wood chips, sawdust, bark, and peat) from a 32 MW fluidized bed boiler at a municipal district heating plant were investigated. Silicate minerals were predominant in the bottom ash and calcium minerals in the fly ash, with most of the inorganic nutrients and heavy metals being enriched in the fly ash. The enrichment factors for heavy metals in the fly ash varied between 0.2 for silicon and 16.3 for lead, and for plant nutrients, between 1.5 for phosphorous and 108 for potassium. However, all heavy metal concentrations in both the bottom ash and fly ash were significantly lower than the current Finnish limit for maximum allowable heavy metal concentrations for forest fertilizers, which came into force in March 2007. According to the particle size distribution, the mass loadings of heavy metals in the fly ash were more than 90% contributed by the smallest particle size fraction lower than 0.074 mm. In the bottom ash, between 83.6 and 91.9% of the mass loadings of heavy metals were contributed by the particle size fraction between 0.5 and 2.0 mm.
机译：在这项研究中，底灰和粉煤灰的物理和化学性质是由一台32 MW流化床锅炉在市政集中供热下燃烧生物质衍生燃料（即木屑，锯末，树皮和泥炭）共同燃烧产生的植物进行了调查。底灰中的硅酸盐矿物占主导地位，粉煤灰中的钙矿物占主导地位，大多数无机养分和重金属富含飞灰。粉煤灰中重金属的富集系数在硅中为0.2，铅中为16.3，植物养分在磷中为1.5，钾在108之间。但是，底灰和粉煤灰中的所有重金属浓度均明显低于芬兰现行的森林肥料允许的最大重金属浓度限值，该限值于2007年3月生效。根据粒径分布，质量负荷粉煤灰中的重金属中90％以上是由小于0.074毫米的最小粒度分数贡献的。在底灰中，重金属质量负载的83.6％至91.9％是由0.5至2.0 mm的粒径分数所贡献的。

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