The influence of the flue gas temperature on the concentration of metals in fly ash and deposited ash during heavy-metal-contaminated woody biomass combustion was investigated. The biomass gathered from heavy-metal-contaminated soil was combusted in a 34 kW_th boiler, and the metal flow was monitored through the metal content of solid residues for up to 30 elements. The flue gas temperature was controlled by the heat exchanger, and it was found that, by decreasing the temperature, more metals can be kept inside the combustion system, potentially lowering the environmental heavy metal pollution because more metal volatiles are being condensed on fly ash particles, which can be separated using known filtration techniques. The concentrations of Ag, Co, Cr, Cu, Fe, Ga, Mg, Mn, Ni, Pb, Si, Sn, Ti, V, and Zr were significantly higher in fly ash samples collected at 150 °C flue gas temperature compared to the 250 °C case, indicating a strong temperature dependence. A minor temperature dependence was observed in deposited ash samples for most elements. On the basis of the results, decreasing the flue gas temperature is a viable method for lowering metal emission during contaminated woody biomass combustion.

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烟气温度对生物质燃烧过程中金属行为的影响

研究了烟气温度对重金属污染的木质生物质燃烧过程中飞灰和沉积灰中金属浓度的影响。从重金属污染的土壤中收集的生物质在34 kW _th的温度下燃烧锅炉，并通过多达30种元素的固体残留物中的金属含量监测金属流量。烟气温度由热交换器控制，发现通过降低温度，可将更多的金属保留在燃烧系统内，这可能降低了环境重金属的污染，因为更多的金属挥发物被冷凝在粉煤灰颗粒上，可以使用已知的过滤技术进行分离。与在150°C烟气温度下收集的粉煤灰样品相比，在烟道气温度下收集的Ag，Co，Cr，Cu，Fe，Ga，Mg，Mn，Ni，Pb，Si，Sn，Ti，V和Zr的浓度显着高于在250°C的情况下，表明强烈的温度依赖性。对于大多数元素，在沉积的灰分样品中观察到较小的温度依赖性。根据结果​​，