Biomass with high concentration of alkali/alkaline and silica components can lead to slagging/fouling, and sintering of the ash deposits, causing corrosion and erosion of the boilers. There are several methods to predict bed agglomeration such as slagging/fouling indexes. However, these indexes are developed to be used for coal ashes, which shows a different behaviour than biomass fuels. The aim of this work was to determine the suitable percentage of different species found in biomass blends in order to reduce the risk of slagging and sintering. We studied the ash behaviour of 24 blended biomass samples using two slagging indexes: the alkali index, and the % of bases in ashes index, and we validated these two indexes with the Bioslag test, and with the Hardness Index (%D₁). There is low risk of slagging in most of the samples, as well as a low sintering risk. However, some samples present moderate risk of sintering possibly due to SiO₂. The Bioslag test and the %D₁ test support our results. Samples showing risk of sintering exceed 25% of the total accumulated ash weight percentage ac%_1P>25%, and show a hardness of %D₁ > 0.7. These validations can be considered as useful tools for estimating slagging and sintering of woody biomass fuels in domestic pellet boilers.

具有高浓度的碱/碱和二氧化硅成分的生物质会导致结渣/结垢，以及灰烬沉积物的烧结，从而导致锅炉的腐蚀和侵蚀。有几种预测床层结块的方法，例如下渣/结垢指数。但是，这些指标被开发用于煤灰，其表现出与生物质燃料不同的行为。这项工作的目的是确定在生物质混合物中发现的不同物种的合适百分比，以减少结渣和烧结的风险。我们研究的使用两个造渣索引24个共混生物质样品的灰行为：碱指数，和在灰烬指数碱基％，我们验证了与这两个指标Bioslag测试，并与硬度指数（％d ₁）。大多数样品中的结渣风险低，并且烧结风险也低。但是，某些样品可能由于SiO ₂而具有中等的烧结风险。该Bioslag测试和％d ₁试验支持我们的结果。显示出烧结风险的样品超过总灰分总重量百分比ac％_1P> 25％的25％，并且硬度为％D ₁  > 0.7。这些验证可以被认为是估计家用颗粒锅炉中木质生物质燃料的结渣和烧结的有用工具。