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首页> 外文期刊>Fuel >Estimation of trace element release and accumulation in the sand bed during bubbling fluidised bed co-combustion of biomass, peat, and refuse-derived fuels
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Estimation of trace element release and accumulation in the sand bed during bubbling fluidised bed co-combustion of biomass, peat, and refuse-derived fuels

机译：估算生物质，泥炭和垃圾衍生燃料鼓泡流化床燃烧过程中沙床中微量元素的释放和积累

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The experimental study and thermodynamic equilibrium calculations were performed to investigate the interactions of fuel-based lead, copper, zinc, and manganese with the bed material of the bubbling fluidised bed boiler (BFB) during the co-combustion of sawdust, peat, and refuse-derived fuel. Flue gas trace element measurements, a chemical analysis of process streams, and mass balance calculations over the boiler reveal that the bed material captures substantial amounts of Pb, Cu, Zn and Mn, but also that these metals are released from the bed when the fuel characteristics or the process parameters are changed. The study shows that the trace metal emissions of a BFB boiler are not necessarily directly related to metal concentrations of the fuel but are rather a result of a complex process combining the release of trace metals from the fuel, the interaction between the fuel and fuel ash particles within the bed material, and the release of trace metals from the bed. The EDS analysis of the bed material particles shows that the original sand particles are covered with a Ca- and K- rich layer. In combustion temperatures, the layer is assumably in a melt form and has an important role in the trace metal accumulation/release process. The thermodynamic multi-phase multi-component equilibrium calculation for zinc suggests that the release of zinc from the bed material is strongly increased with an increasing Cl-concentration of the fuel, due to the conversion of the bed-bound zinc to ZnCl_2.
机译：进行了实验研究和热力学平衡计算，以研究在锯末，泥炭和垃圾混合燃烧过程中，燃料基铅，铜，锌和锰与鼓泡流化床锅炉（BFB）床层材料之间的相互作用。燃料。烟道气中微量元素的测量，过程流的化学分析以及锅炉的质量平衡计算表明，床层材料捕获了大量的Pb，Cu，Zn和Mn，而且当燃料用作燃料时，这些金属也会从床层中释放出来。特性或过程参数已更改。研究表明，BFB锅炉的痕量金属排放不一定与燃料中的金属浓度直接相关，而是复杂过程的结果，该过程结合了燃料中微量金属的释放，燃料与燃料灰分之间的相互作用床内物料中的颗粒，以及床中微量金属的释放。床层材料颗粒的EDS分析表明，原始的沙子颗粒覆盖有富含Ca和K的层。在燃烧温度下，该层可能呈熔融形式，并且在痕量金属的积累/释放过程中起着重要的作用。锌的热力学多相多组分平衡计算表明，由于与床结合的锌向ZnCl_2的转化，随着燃料中Cl浓度的增加，锌从床层材料中的释放会大大增加。

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