60 t/h煤粉预热燃烧锅炉宽负荷运行特性研究  

Wide load operation characteristics of a 60 t/h boiler with pulverized coal preheating

作　　者：田继林 朱建国[1,3] 朱书骏 刘敬樟 曾雄伟[1] 欧阳子区 吕清刚 TIAN Jilin;ZHU Jianguo;ZHU Shujun;LIU Jingzhang;ZENG Xiongwei;OUYANG Ziqu;LYU Qinggang(State Key Laboratory of Coal Conversion,Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;Shanxi Key Laboratory of Coal Flexible Combustion and Thermal Conversion,Datong Institute of Coal Clean and Efficient Utilization,Datong 037000,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院工程热物理研究所,煤炭高效低碳利用全国重点实验室,北京100190 [2]大同市煤炭清洁高效利用研究所,煤灵活燃烧与热转化山西省重点实验室,山西大同037000 [3]中国科学院大学,北京100049

出　　处：《热力发电》2024年第4期133-140,共8页Thermal Power Generation

基　　金：中国科学院战略性先导科技专项课题(XDA21040100,XDA29010200)。

摘　　要：为满足国家“双碳”目标下煤炭清洁高效利用领域的迫切需求,在工业锅炉、电站锅炉等领域开发了煤粉预热燃烧技术。煤粉先进入流态化预热燃烧器中高温改性,再进入锅炉炉膛分级配风燃烧,从而实现了煤高效、低氮燃烧,并在1台60 t/h煤粉锅炉上进行了技术验证。锅炉侧墙对冲布置了2只预热燃烧器,单只预热燃烧器设计热功率为26 MW,以烟煤为原料,在10%~100%负荷范围开展了6个不同负荷的锅炉运行特性和NOx排放特性试验研究,结果表明:该锅炉在各负荷下运行状态稳定、良好,无助燃条件下实现了10%超低负荷稳定运行;预热燃烧器各参数合理、循环状态稳定,满足锅炉宽负荷的运行要求;负荷下锅炉燃烧效率均在97%以上,10%、20%负荷下锅炉热效率大于85%,30%及以上负荷锅炉热效率均在90%以上;通过调整配风,锅炉各负荷下NO_(x)原始排放均低于50mg/m^(3)(φ(O2)=9%)。60 t/h煤粉预热燃烧锅炉的成功示范,为煤粉高效清洁灵活燃烧技术的发展和应用提供了重要支撑。Responding to the urgent needs of clean and efficient utilization of coal under the background of national“carbon peaking and carbon neutrality”,the pulverized coal preheating combustion technology has been developed in industrial boilers,power plant boilers and other fields.In this technology,pulverized coal is modified at high temperature in a fluidized preheating burner,then the preheated fuel enters the furnace for graded air distribution combustion,thus high efficiency and low NOx combustion of pulverized coal is realized.Moreover,technical verification was carried out on a 60 t/h pulverized coal boiler,which adopts two preheating burners with side wall hedge arrangement,and one preheating burner is designed with thermal power of 26 MW.Using bituminous coal as raw material,the operation and NOx emission properties of the boiler at 10%~100%operating loads were studied experimentally,and the results showed that,the boiler operated stably and well at each load,it achieved stable operation of 10%ultra-low load without any auxiliary means.The preheating burners had reasonable operating parameters and stable circulation state,which can meet the requirements of wide load operation of the boiler.The combustion efficiency of the boiler at each operating load were all above 97%,the thermal efficiency of the boiler were above 85%at 10%and 20%operating load,and above 90%at 30%and above operating load.By adjusting the air distribution,the original NOx mass emission of the boiler at each operating load can be controlled lower than 50 mg/m^(3)(φ(O2)=9%).The successful demonstration of the 60 t/h pulverized coal preheating combustion boiler provides important support for the development and application of clean,efficient and flexible combustion technology of pulverized coal.

关 键 词：预热燃烧 煤粉锅炉 超低负荷稳燃 高效燃烧 超低NOx排放 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]