基于耐火材料的粉煤燃烧过程结渣特性

Slagging characteristics on refractory materials during pulverized-coal combusting

采用光学显微镜,X射线衍射等方法对煤粉气流燃烧过程在不同耐火板上的渣样进行了测试,并就渣样的形貌及结晶特性、渣样成分与不同耐火板之间的高温烧结特性进行了研究.结果表明:灰分中碱性金属氧化物含量较低的煤粉气流燃烧过程中,SiC质耐火板与熔融煤灰的结晶度明显高于刚玉质耐火板;刚玉质耐火板在粉煤焦炭颗粒开始着火燃烧时灰渣结晶度达到最小,约为35%,SiC质耐火板与熔融煤灰结晶度在焦炭颗粒旺盛燃烧区达到最大,约为58%,较好地反映了渣板之间的黏结作用.

In order to study the slagging characteristics of boiler refractory liners during pulverized coal stream combustion, the slag samples of pulverized coal stream combusting experiments were investigated by optics microscope, X-ray diffraction （XRD） , and the slagging samples＇ properties of morphology, crystal and the sintering characteristics between ash compositions and refractory material in high temperature were studied. The results show that during pulverous coal with less alkalescence metal-oxide in its ash combusting, the molten coal ash has large crystallinity with SiC block than with corundum block. The minimum crystallinity of ash with corundum block is about 35% while the coke granule catch fire and burn, and the maximum crystallinity of ash with SiC block is 58% or so while the coke granule come into the maximal combustion intensity area. The crystallinity preferably reflects the viscidity action between molten ash dregs and refractory blocks.