型煤燃烧固硫中的温度效应

The Effect of Temperature on Efficiency of Sulfur CaptureDuring Coal Briquette Combustion

以氧化钙作为固硫剂的型煤中适当加入Ｆｅ、Ｓｉ添加剂组分，燃烧生成新的固硫体系后进行２种不同温度条件下的进样实验．①型煤样品分成６份，进行逐渐升温实验，分别加热到１１７０℃－１２２０℃，温度间隔１０℃，恒温１／４ｈ；②型煤样品分成７份，进行先升温后进样实验，将加热炉分别升温至要求温度１０００℃－１３００℃后进样，温度间隔５０℃，恒温１／２ｈ．实验表明：在Ｆｅ、Ｓｉ体系的型煤燃烧过程中，当进样温度条件不同，即当型煤直接进入高温炉燃烧时其固硫率比逐渐升温燃烧明显提高，在１３００℃时实验②固硫率为７７％，实验①已降到３０％以下．对所生成的燃烧产物采用Ｘ射线粉末衍射法与Ｘ射线荧光光谱法进行分析与表征，讨论温度对固硫率的影响。

In this paper,the effect of temperature on efficiency of sulfur capture was studied for coal briquette with an additive(Fe,Si)at high temperature combustion.The results showed that the coal briquette of FeSi system in process of combustion at different sampling conditions,the rate of sulfur capture is obvious difference.During the coal briquette entered into the furnace directly at 1300℃,the rate of sulfur capture reached up to 77%.Characterization of the slags left after combustion has been carried out by using Xray powder diffraction method and Xray fluorescent spectrometry.No other crystalline sulfurcontaining species besides CaSO 4 and CaS were found.A vitreous iron oxides and small amounts of silicate were identified on the surface of sulfurcontaining grains by means of other method.This might explain the diffusion barrier mechanism of sulfur fixation during coal briquette combustion at high temperature.