Characteristics of sulphur retention in ashes of chinese coals used for power generation
我国动力用煤煤灰自身固硫特性的统计分析

The characteristics of sulphur retention in laboratory prepared ash was statistically analyzed based on regular analytical data from a set of 186 coal samples.It is shown that the higher sulphur content of coal is,the lower molar ratio of Ca/S and molar ratios of Mg/S,2Na/S,2K/S are,thus the lower percentage of sulphur retention in ash is.Calcium plays a primary role in sulphur retention,and the percentage of sulphur retained in ash increases as an exponential function with the increment of Ca/S molar ration of coal.The active parts of the rest basic elements(Mg,Na,K,etc.) can also contribute to sulphur retention.It is implied from the results of this investigation that the sulphur retention behavior of laboratory prepared ash can be applied to fluidized bed combustion and can be used as reference in pulverized coal combustion.