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根据煤在足够高温度下，停留时间越长，分子结构的晶格化程度越高，因而反应活性越低，同时真比重也越大的原理，采用重液将一种链条锅炉飞灰中的残炭颗粒富集并按不同真比重分开。各比重组颗粒表面积测定结果符合不同燃尽度焦炭比表面积变化规律；小流化床燃烧实验证明随真比重增大，残炭颗粒本征反应活性降低。说明真比重分离法对于判断飞灰残炭颗粒的形成途径和再燃特性很有效。实验结果表明，链条炉飞灰残炭并不主要由原煤中的细小颗粒形成，由中等和大颗粒原煤形成的飞灰残炭占相当比例；在真比重最大的残炭组中，细小颗粒所拥有的总碳量最大。估计它们是由大颗粒或大块原煤经过炉内高温区、停留时间长，燃烧后期碎裂形成的。
According to the principle that coal has a sufficiently high temperature, a longer residence time, a higher degree of crystal lattice structure, and thus a lower reactivity and a higher true specific gravity, a heavy-duty liquid is used in a fly ash of a chain boiler Carbon residue is enriched and separated according to different specific gravity. The measured results of particle surface area of each specific gravity complies with the variation of specific surface area of burned coking coal. The experiments of small fluidized bed combustion prove that the intrinsic reactivity of residual carbon particles decreases with the increase of real specific gravity. It shows that the true proportion separation method is very effective in judging the formation and reburning characteristics of fly ash residue carbon particles. The experimental results show that fly ash residue charcoal in the chain furnace is not mainly formed by fine particles in the raw coal, but fly ash residual carbon formed by the medium and large particles of raw coal accounts for a considerable proportion; in the real carbon residue group with the largest specific gravity, Has the largest amount of total carbon. Estimated that they are from large particles or large coal through the furnace after the high-temperature zone, stay a long time, the latter part of the combustion fragmentation.