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The prediction of behaviour of ashes from five different solid fuels in fluidised bed combustion

机译：五种不同固体燃料在流化床燃烧中灰烬行为的预测

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The behaviour of different ashes was predicted by the combination of extended fuel analysis with advanced global thermodynamic equilibrium calculations. The extended fuel analysis is a fractionation method that consists of sequential leaching of a solid fuel with water, ammonium acetate and hydrochloric acid. In order to cover a broad spectrum of fuels a coal, a peat, a forest residue and Salix (i.e. willow) were studied. The last was taken with and without soil contamination, i.e. with a high and low content of silica, respectively. Results from the fractionation showed clear differences in mineral distribution in the fuels. More ash-forming elements were present as included minerals in the older fuels. In relatively young fuels, almost half of the inorganic material was found in the soluble fractions after leaching with water and ammonium acetate. Fouling and slagging predictions based on the combined use of the extended fuel analysis and the advanced global equilibrium analysis indicated that no ash--related problems should be expected in FBC boilers firing the studied coal. The peat that was studied could cause minor ash depositions in the flue gas channel at temperatures above 700"C. The studied forest residue could form fly ash deposits in the flue gas channel at temperatures between 600 and 860deg.C. The Salix could cause fly ash depositions at temperatures between 840 and approximately l000deg.C. If soil contamination was present as well, Salix could cause bed sintering at temperatures above l030deg.C.
机译：通过将扩展的燃料分析与高级的全局热力学平衡计算相结合，可以预测不同灰烬的行为。扩展的燃料分析是一种分馏方法，包括依次用水，乙酸铵和盐酸浸出固体燃料。为了涵盖广泛的燃料，对煤，泥炭，森林残渣和柳柳（即柳树）进行了研究。最后是在有和没有土壤污染的情况下拍摄的，即分别具有高和低含量的二氧化硅。分馏的结果表明燃料中矿物分布的明显差异。在较旧的燃料中，更多的成灰元素以矿物形式存在。在相对年轻的燃料中，用水和乙酸铵浸出后，可溶部分中几乎发现了一半的无机物质。基于扩展燃料分析和高级全局平衡分析的结合使用的结垢和结渣预测表明，在燃烧所研究煤炭的FBC锅炉中，不会出现与灰分有关的问题。所研究的泥炭在温度高于700“ C时可能导致烟道中少量灰烬沉积。所研究的森林残留物可能在600至860°C的温度下在烟道中形成粉煤灰沉积物。粉煤灰的沉积温度在840至约1000摄氏度之间。如果还存在土壤污染，柳柳可能会在高于1030摄氏度的温度下引起床层烧结。

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