煤种对氨煤混燃NO_(x)生成特性影响  

Effects of the Coal Type on NO_(x)Formation Characteristics of Ammonia-coal Cofiring

作　　者：王耿辉 谢妍 李君[1] 刘欣[1] 张文振 张超群 李明 牛涛 王赫阳 WANG Genghui;XIE Yan;LI Jun;LIU Xin;ZHANG Wenzhen;ZHANG Chaoqun;LI Ming;NIU Tao;WANG Heyang(School of Mechanical Engineering,Tianjin University,Jinnan District,Tianjin 300072,China;Yantai Longyuan Power Technology Co.,Ltd.,Yantai 264006,Shandong Province,China)

机构地区：[1]天津大学机械工程学院,天津市津南区300072 [2]烟台龙源电力技术股份有限公司,山东省烟台市264006

出　　处：《中国电机工程学报》2025年第5期1808-1817,I0016,共11页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

摘　　要：该文通过模拟一维炉内烟煤和无烟煤混氨燃烧的NOx生成过程,研究煤种对氨煤混燃NOx生成特性的影响。结果表明,烟煤混氨燃烧的NO排放随混氨比例增加呈先降低后升高趋势,而无烟煤混氨燃烧的NO排放随混氨比例增加呈先上升后降低趋势,并且明显高于烟煤。尽管两种工况的NO生成特性存在显著差异,但控制机制是一致的,即炉内NH_(3)的NO生成与还原反应路径在不同O_(2)环境中的持续竞争关系决定氨煤混燃最终的NO净生成量。在该文模拟工况中,NH_(3)晚于煤粉通入炉膛,使得NH_(3)燃烧晚于挥发分。挥发分的燃烧改变主燃区的O_(2)浓度,进而影响NH_(3)的反应环境和NO生成。由于烟煤和无烟煤的挥发分含量存在显著差异,挥发分燃烧后形成的O_(2)浓度分布各不相同,导致NO生成和还原反应路径之间的相对竞争关系截然不同,从而造成烟煤和无烟煤不同的NO生成与排放特性。The effects of coal types on the NOx formation characteristics of ammonia-coal co-firing are investigated by simulating the NOx formation process of ammonia co-firing with bituminous and anthracite coals in a one-dimensional test furnace.The results show that the NO emissions tend to decrease and then increase with the increase of NH_(3)co-firing ratio when co-firing with bituminous coal;while the NO emissions of ammonia-anthracite coal tend to decrease and then increase with the ammonia co-firing ratio,and these emissions are significantly higher than those from bituminous coal co-firing.Despite the significant differences in the NO formation characteristics of both coals,it can be found that they are governed by the same mechanism,i.e.,the net NO formation of ammonia-coal co-firing is determined by the competition between the NO-formation and NO-reduction reaction pathways of NH_(3)in different O_(2)environments along the furnace.In the present study,NH_(3)is injected into the furnace later than the coal stream such that the combustion of NH_(3)is later than the coal volatile matter.This affects the NH_(3)combustion environment in the main combustion zone,and consequently,the formation of NO.Because of the significant differences in volatile matter content between bituminous and anthracite coals and the resultant differences in the amount of O_(2)consumption,the distribution of O_(2)concentrations in the furnace is substantially different between the two types of coals.This results in different competition relationships between the NO-formation and NO-reduction reaction pathways of NH_(3),causing different NO formation and emission characteristics between the bituminous and anthracite coals.

关 键 词：烟煤 无烟煤 氨煤混燃 NOX排放量 数值模拟 

分 类 号：X773[环境科学与工程—环境工程]