一种NGD脱硫用粉煤灰f-CaO含量测定方法

Determination of f-Cao content in fly ash for NGD desulfurization

为探索一种NGD脱硫用粉煤灰脱硫活性的快速评价方法,采用蔗糖浸取EDTA滴定法对几种灰样中的f-Cao含量进行测定。在测试煤种和工况下,锅炉燃烧得到的纯粉煤灰f-CaO含量约为7%,分别加入0.5%和1%熟石灰后灰样中f-CaO含量增加为7.43%和7.89%。滴定结果与计算值一致。通过脱硫效果测试发现,样品的脱硫效率与其f-CaO含量的趋势一致。该测试方法得到的数据可靠且操作简单。作为评价NGD用粉煤灰脱硫活性的辅助手段,本方法具有很强的实用价值。

In order to evaluate the desulfurization activity of fly ash rapidly which was used for NGD desulfurization,the content of f-CaO in several fly ash samples were determined by sucrose extraction and EDTA titration method.Under certain conditions,the content of f-CaO of pure fly ash was about 7%.As 0.5% and 1% slaked lime were added to the ash,the content of f-CaO increased to 7. 43% and 7. 89%.The titration results were close to the calculated values.Through the desulfurization effect test,the desulfurization efficiency of the sample was consistent with the f-CaO content. The operation was simply. As an auxiliary means to evaluate the desulfurization activity of fly ash used in NGD desulfurization,the method had strong practical value.