In this paper,the main influence factors and influence characteristics of sulfur realease are researched by the tube furnace during the coal combustion.The experimental results indicated that the formation of gaseous sulfur are affected not only by the combustion condition but also by the properties of coal and the formation conditions of sulfur of coal during coal combustion.The retention time of coal inside the furnace is the best important influence factor,the second is the combustion temperature,the las...