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Measurement of soot and char in pulverized coal fly ash

机译：粉煤灰中烟灰和焦炭的测定

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The unburned carbon in the fly ash produced by low-NOx pulverized coal combustion has been shown by electron microscopy to be a mixture of porous coal char particles and aggregates of submicron particles, which are thought to be soot. The carbon is bimodally distributed with large soot aggregates mixed with the char in the particles larger than l0 μm and dispersed soot found with the submicron particles. A method for determining the mass of soot and char by liquid--suspension gravity separation was used with both laboratory-scale and power plant fly ash samples. For low--NOx staged, pilot-scale combustion of bituminous coal the soot in the furnace exit ash was estimated to be 0.2--0.6/100 of the fuel carbon, which was about 35/100 of the total unburned carbon.
机译：电子显微镜显示，低NOx煤粉燃烧产生的粉煤灰中未燃烧的碳是多孔煤焦颗粒和亚微米颗粒聚集体的混合物，被认为是烟灰。碳是双峰分布的，与大于10μm的颗粒中的炭混合有大的炭黑聚集体，而分散的炭黑则与亚微米颗粒一起发现。实验室规模和电厂粉煤灰样品都采用了一种通过液体-悬浮液重力分离法测定烟灰和焦炭质量的方法。对于低NOx阶段性烟煤的中试燃烧，炉子出口灰中的烟灰估计为燃料碳的0.2--0.6 / 100，约占总未燃烧碳的35/100。

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