钠化合物对高碱煤液态排渣过程中Na和S迁移的影响  

Effect of sodium compounds on the migration of Na and S during the slag-tap of high-alkali coal

作　　者：唐明图 张芝昆 马蒸钊 王晶[1] 杨建成 沈伯雄[1,2] TANG Mingtu;ZHANG Zhikun;MA Zhengzhao;WANG Jing;YANG Jiancheng;SHEN Boxiong(School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China;Tianjin Key Laboratory of Clean Energy and Pollution Control,Tianjin 300401,China;China Offshore Environmental Service Ltd.,Tianjin 300457,China)

机构地区：[1]河北工业大学能源与环境工程学院,天津300401 [2]天津市清洁能源利用与污染物控制重点实验室,天津300401 [3]中海石油环保服务(天津)有限公司,天津300457

出　　处：《河北工业大学学报》2022年第1期54-60,共7页Journal of Hebei University of Technology

基　　金：国家重点研发计划(2018YFB0604101);河北省自然科学基金(E2018202180)。

摘　　要：液态排渣技术是解决高碱煤结渣、黏污难题的一种有效途径。以典型准东煤-西黑山煤为研究对象,在原煤中负载不同比例的NaCl和Na_(2)CO_(3),对原煤和负载煤的煤灰进行高温(900~1400℃)燃烧实验来模拟液态排渣过程,研究煤灰中Na和S的迁移规律。结果表明:钠化合物的负载可以减少煤灰高温燃烧过程中SO_(2)的释放,其中负载0.5%NaCl和3.0%Na_(2)CO_(3)的固硫作用明显;钠化合物的负载提高了煤灰的单位质量损失和煤灰中Na的含量,其中负载Na_(2)CO_(3)的作用强于NaCl;随着燃烧温度的升高,煤灰的单位质量损失增加,而其中Na含量则呈现先降低后升高再降低的规律。负载3.0%Na_(2)CO_(3)的煤灰在加热过程中Na_(2)SO_(4)和Na_(6)Ca_(2)Al_(6)Si_(6)O_(24)(SO_(4))_(2)的衍射强度较高,在1300~1400℃时新生成了KNa_(3)(AlSiO_(4))_(4);原煤灰在1200℃时出现熔融和团聚,负载3.0%Na_(2)CO_(3)的煤灰在1100℃时就出现了明显的熔融。The slag-tap technology was an effective approach to overcome the serious problemsof fouling and slagging of high-alkali coal.As a typical Zhundong coal,Xiheishan coal was chosen as the object of the investigation,and NaCl and Na_(2)CO_(3) in different proportions were loaded in Xiheishan coal.The combustion experiment on raw coal ash and loaded coal ash at 900~1400℃were carried out to simulate the slag-tap process,and to study the migration of Na and S in ash.The results show that the loading of sodium compounds can reduce the release of SO_(2) during the high-temperature com⁃bustion of coal ash,and the loading of 0.5%NaCl and 3.0%Na_(2)CO_(3) has a significant effect on sulfur fixation.The load⁃ing of sodium compounds increased the unit mass loss of coal ash and the content of Na in the ash,and the effect of load⁃ing Na_(2)CO_(3) was stronger than NaCl.As the combustion temperature increased,the unit mass loss of ash increased,and the Na content decreased first,and then decreased after increasing.During the heating process of ash loaded with 3.0%Na_(2)CO_(3),the diffraction intensity of Na_(2)SO_(4) and Na_(6)Ca_(2)Al_(6)Si_(6)O_(24)(SO_(4))_(2) was higher than that of raw coal,and newly formed KNa_(3)(AlSiO_(4))_(4) at 1300~1400℃.The raw coal ash melted at 1200℃,and the ash loaded with 3.0%Na_(2)CO_(3) melted sig⁃nificantly at 1100℃.

关 键 词：高碱煤 液态排渣 钠化合物 NA S 

分 类 号：X511[环境科学与工程—环境工程]