Abstract Ash resistivity is an important factor in the collection efficiency of electrostatic precipitators (ESPs). There is good experience in the industry regarding resistivity of coal fly ash and well-established models for its prediction based on coal ash composition. The same is not true for biomass ash and this paper reports much-needed data for three different biomass types. Coal pulverised fuel ash (PFA), can be used as an aluminosilicate additive to mitigate biomass ash deposition issues. The effects of PFA additive on the resistivity of biomass ashes is also reported here. Biomass ash resistivity is an order of magnitude lower than that of typical coal ashes, and thus re-entrainment of particles in ESPs may become an operational issue, exacerbated by the presence of moisture and sulphur. PFA additive can increase the resistivity, but also leads to higher ash loading. Regression analysis indicates that potassium in biomass ash impacts significantly upon resistivity, contrary to previous studies. Various existing resistivity models were tested for predicting biomass ash resistivity; they produced significant overestimates when compared to experimental results due to omission of potassium as a component of the ash. Modifications to existing models or new models are required to predict resistivity of biomass ashes, and the data reported here will be important for developing such a model.

中文翻译：

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研究铝硅添加剂对生物质灰电阻率的影响

摘要 灰电阻率是影响静电除尘器（ESP）收集效率的重要因素。业界在粉煤灰的电阻率方面有很好的经验，并有完善的基于粉煤灰成分的预测模型。生物质灰并非如此，本文报告了三种不同生物质类型的急需数据。煤粉燃料灰 (PFA) 可用作铝硅酸盐添加剂，以减轻生物质灰沉积问题。此处还报告了 PFA 添加剂对生物质灰分电阻率的影响。生物质灰的电阻率比典型的煤灰低一个数量级，因此 ESP 中颗粒的再夹带可能成为一个操作问题，并因水分和硫的存在而加剧。PFA添加剂可以增加电阻率，但也会导致更高的灰分负荷。回归分析表明，与之前的研究相反，生物质灰中的钾对电阻率有显着影响。测试了各种现有的电阻率模型以预测生物质灰分电阻率；由于遗漏了钾作为灰分的组成部分，与实验结果相比，他们产生了明显的高估。需要对现有模型或新模型进行修改以预测生物质灰分的电阻率，此处报告的数据对于开发此类模型非常重要。由于遗漏了钾作为灰分的组成部分，与实验结果相比，他们产生了明显的高估。需要对现有模型或新模型进行修改以预测生物质灰分的电阻率，此处报告的数据对于开发此类模型非常重要。由于遗漏了钾作为灰分的组成部分，与实验结果相比，他们产生了明显的高估。需要对现有模型或新模型进行修改以预测生物质灰分的电阻率，此处报告的数据对于开发此类模型非常重要。