深度调峰工况下燃煤锅炉煤氨混燃兼容性分析  

Compatibility Analysis of Coal-ammonia Co-firing in Coal-fired Boiler Under Deep Peak Regulation Conditions

作　　者：张皓玮 陈亮[1] 王春波[1] ZHANG Haowei;CHEN Liang;WANG Chunbo(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Baoding 071003,Hebei Province,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,河北省保定市071003

出　　处：《中国电机工程学报》2025年第9期3554-3562,I0023,共10页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基　　金：国家自然科学基金项目(52306135,51976059);中央高校基本科研业务费项目(2023MS126)。

摘　　要：掺氨燃烧是燃煤机组降低碳排放的有效手段。新能源大比例上网背景下,燃煤机组深度调峰成为新常态,低负荷下燃煤锅炉掺氨燃烧的兼容性有待探究。该文建立某600 MW超临界燃煤锅炉低负荷(50%~30%额定负荷)运行时掺氨燃烧的热力计算模型,探究氨掺烧对低负荷下炉膛及对流受热面传热的影响。结果表明,低负荷工况下,掺烧0~50%氨对炉膛容积热负荷和截面热负荷影响不大,炉膛出口烟温上升6.5℃以内;通过调整尾部前后烟道的烟气份额,掺烧0~50%氨后主、再热蒸汽温度基本保持稳定;随掺氨比例增加,锅炉一、二次热风温度略有降低;与纯煤燃烧相比,50%掺氨比例下锅炉排烟温度增长5.8~7.6℃,由此导致锅炉效率下降约0.5%~0.7%。研究结果可为评估燃煤锅炉低负荷下煤氨混燃的可行性提供一定指导。Co-firing ammonia is an effective way to reduce carbon emissions from coal-fired units.As increasing amounts of renewable energy are integrated into the grid,deep peak regulation of coal-fired units has become common,yet the compatibility of ammonia co-firing in coal-fired boilers under low loads requires further investigation.This study establishes a thermodynamic model for ammonia co-firing in a 600 MW supercritical coal-fired boiler under low loads(50%~30%rated capacity)and examines the impact of ammonia co-firing on heat transfer in the furnace and convective heating surfaces.Results indicate that under low loads,co-firing 0~50%ammonia has minimal influence on the furnace’s volume heat load and sectional heat load,with the furnace outlet flue gas temperature rising by less than 10℃.By adjusting the flue gas distribution in the tail section,the main and reheated steam temperatures remain stable when co-firing 0~50%ammonia.As the ammonia ratio increases,the primary and secondary hot air temperatures experience a slight decline.Compared to pure coal combustion,co-firing 50%ammonia raises the exhaust flue gas temperature by 5.8~7.6℃,leading to a boiler efficiency reduction of approximately 0.5%~0.7%.These findings offer valuable insights for assessing the feasibility of coal-ammonia co-firing in coal-fired boilers under low-load conditions.

关 键 词：燃煤锅炉 氨掺烧 低负荷 兼容性 热力计算 

分 类 号：TK[动力工程及工程热物理]