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在煤燃烧过程中，煤灰自身有一定的固硫能力。本文根据我国发电用煤的煤质分析数据，将煤灰固硫率与煤中硫和碱性成分含量相关联，研究了实验室制灰和煤粉燃烧时煤中碱性成分的固硫作用，表明：实验室制灰条件下，钙在煤灰固硫中起主导作用，固硫率随煤中Ｃａ／Ｓ摩尔比的增加呈指数趋势增加，而其它成分（Ｎａ，Ｋ，Ｍｇ等）的作用不大；因钙的固硫作用类似于ＣａＯ吸收剂，实验室制灰时的固硫特性可应用于流化床燃烧；与此相比，煤粉炉中因温度高、停留时间短，钙的固硫作用显著降低，而其它碱性成分的贡献明显增大。
In the process of coal combustion, coal ash itself has a certain sulfur-fixing capacity. Based on the coal quality analysis data of power generation coal in our country, this paper correlates the sulfur fixation rate of coal ash with the content of sulfur and alkaline components in coal, and studies the sulfur-fixing effect of alkaline components in coal during lab-ash and coal combustion , Which indicates that calcium plays a leading role in the sulfur fixation of coal ash under laboratory conditions. The sulfur fixation rate increases exponentially with the increase of Ca / S molar ratio in coal, while the other components (Na, K, Mg, etc.) The role of calcium is similar to the role of sulfur fixation CaO absorbent, lab-ash solidification characteristics can be applied to fluidized bed combustion; compared with the pulverized coal furnace due to high temperature, short residence time , The desulfurization effect of calcium decreased significantly, while the contribution of other basic components increased significantly.