热力发电2018，Vol.47Issue(1)：19-25,32,8.DOI:10.19666/j.rlfd.201705029
Na2O质量分数对高碱煤灰烧结强度影响
Effect of sodium oxide content on ash sintering strength of high alkali coal
摘要
Abstract
In order to study the effect of Na2O content on sintered strength of high alkali synthetic ash, the synthetic ash with different Na2O mass fractions was made into ash column and heated in a tubular furnace. The microcomputer control universal testing machine was applied to test the sintering strength of the synthetic ash, the X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to detect and observe the mineral composition and microstructure of synthetic ash. The results show that, with the increase of Na2O mass concentration, the sintered strength of the ash increased, the sodium compounds in the ash gradually changed from albite to nepheline, and the calcium compounds gradually transformed from anorthite to wollastonite and gehlenite. The low temperature eutectic system formed by minerals such as nepheline, wollastonite and gehlenite produced a large amount of liquid phase in the system, promoting the diffusion process of ash particles and increasing the sintering strength of the ash column. With the increase of Na2O mass concentration, the observed pore size between the ash particles decreased and the surface of the ash particles became more and more smooth.关键词
Na2O/高碱煤/煤灰/烧结强度/矿物转化/XRD/SEM/低温共熔Key words
Na2O/high alkali coal/coal ash/sintering strength/mineral conversion/XRD/SEM/low temperature melting分类
化学化工引用本文复制引用
祁超,肖海平,王东旭,康志忠,孙保民..Na2O质量分数对高碱煤灰烧结强度影响[J].热力发电,2018,47(1):19-25,32,8.基金项目
国家科技支撑计划项目(2015BAA04B02) National Key Technology R&D Program (2015BAA04B02) （2015BAA04B02）
