燃料化学学报2016，Vol.44Issue(3)：263-272,10.
高温气化条件下Na2 O对煤灰中矿物质演化行为的影响
Effect of Na2 O on mineral transformation of coal ash under high temperature gasification condition
摘要
Abstract
In ordre to er ve al the mechna ism of Na2O influence on ash fusoi n tem peratures (AFTs), effect of Na2 O on mineral transfor mation of two coal ashes with different SiO2+Al2 O3 leev ls wre e investgi ated by XRD and FT-IR udn er reducing atmosphere at high temperature.Thermodynamic os ftware package FactSage was used to ac lculate the ΔG of reactions between minerals to reveal the mechanism of Na2 O influence on mineral trna fs ormation.It is found tah t the effect of Na2 O on mineral oc mpositions depends on SiO2+Al2 O3 levels of coal ash.For ash wi th 82.89% SiO2+Al2 O3 while Na2 O content is 5%-20%, albite and nepheline are formed, leading to a decrease of AFTs.However, only nepheline is formed when Na2 O content is higher than 20%.For ash with 47.85% SiO2+Al2 O3 , when Na2 O content is less than 10%, no Na-containing mineral is observed. When Na2 O content is higher than 10%, Na-containing minerals such as combeite, lazurite and sodium aluminium oxide are formed, resulting in a decrease of AFTs.Furthermore, FactSage results reveal that Na-containing mineral is easily formed at high temperature due to lowΔG of the reactions.关键词
高温气化/氧化钠/矿物质/煤灰熔融性Key words
high temperature gasfi ication/Na2 O/mineral matter/AFTs分类
化学化工引用本文复制引用
陈晓东,孔令学,白进,白宗庆,李文..高温气化条件下Na2 O对煤灰中矿物质演化行为的影响[J].燃料化学学报,2016,44(3):263-272,10.基金项目
The project was supported by the National Natural Scienc e Foundation of China （21406254，21476247）， Shanxi Province Science Foundation for Youths （2015021055） and Joint Foundation of Natural Science Foundation of China and Shanxi Province （U1510201）．@@@@国家自然科学基金（21406254，21476247），山西省青年科技研究基金（2015021055）和国家自然科学基金委员（UNFS）-山西煤基低碳联合基金（U1510201）项目资助 （）
