不同煤种对混煤自固硫的影响

Sulfur-retention Characteristics of Different Coal Mixtures

以平朔煤作为中硫煤,选用三个典型低硫煤与其进行不同比例掺配,并研究了煤种对混煤固硫效果的影响.结果表明:混煤固硫率的大小与(Ca+Mg)/S摩尔比和灰中(CaO+MgO)的含量有关;低、低(Ca+Mg)/S摩尔比煤掺配后,混煤的(CaO+MgO)利用率随(Ca+Mg)/S摩尔比的增大呈整体下降趋势,降硫效果主要取决于配煤对硫分的稀释作用;低、高(Ca+Mg)/S摩尔比煤掺配后,混煤的(CaO+MgO)利用率在(Ca+Mg)/S摩尔比为0.8～1时达到最大值,降硫效果取决于配煤对硫分的稀释作用和自身固硫作用.

To study the sulfur-retention characteristics of different coal mixtures,experimental tests were carried out by blending Pingshuo mid-sulfur coal with 3 typical low-sulfur coals in different proportions.Results indicate that the efficiency of sulfur-retention has relations with the molar ratio of（Ca＋Mg）/S in coal and the content of（CaO＋MgO） in ash.When the mid-sulfur coal of low（Ca＋Mg）/S ratio is blended with a low-sulfur coal of low（Ca＋Mg）/S ratio,the utilization rate of（CaO＋MgO） will decrease with rising（Ca＋Mg）/S ratio in the coal mixture,in which case,the sulfur removal effect mainly comes from the dilution of sulfur by the blending coal;whereas when the mid-sulfur coal of low（Ca＋Mg）/S ratio is blended with a low-sulfur coal of high（Ca＋Mg）/S ratio,the utilization rate of（CaO＋MgO） will reach the highest at a（Ca＋Mg）/S molar ratio of 0.8-1,in which case,the sulfur removal effect comes from both the sulfur dilution and sulfur retention by the blending coal.