40 t/h煤粉预热燃烧锅炉运行和低NO_(x)试验研究  

Operation and low NO_(x) experimental research of a 40 t/h preheating combustion pulverized coal boiler

作　　者：满承波 高超 欧阳子区[1,3] 潘清波 田继林 刘敬樟[1,3] 朱建国 MAN Chengbo;GAO Chao;OUYANG Ziqu;PAN Qingbo;TIAN Jilin;LIU Jingzhang;ZHU Jianguo(Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Dalian National Laboratory for Clean Energy,Dalian 116023,China;Yankuangzhongke Clean Energy Technology Co.,Ltd.,Jining 273516,China;Datong Institute of Coal Clean Efficient Utilization,Datong 037305,China)

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]中国科学院大学,北京100045 [3]中国科学院洁净能源创新院,辽宁大连116023 [4]兖矿中科清洁能源科技有限公司,山东济宁273516 [5]大同市煤炭清洁高效利用研究所,山西大同037305

出　　处：《热力发电》2021年第9期160-166,共7页Thermal Power Generation

基　　金：中国科学院战略性先导科技专项变革性洁净能源关键技术与示范(XDA21040100)。

摘　　要：为应对日益严峻的大气污染形势,实现煤粉高效低NO_(x)燃烧,开发了煤粉预热燃烧技术。煤粉首先进入流化床预热燃烧器,与较低当量比的空气发生部分燃烧反应产生热量将自身预热至800℃以上,在高温强还原性气氛下析出并脱除部分燃料氮,预热后的燃料随后进入煤粉炉炉膛,在炉内通过分级配风进一步控制NO_(x)生成。某40 t/h煤粉预热燃烧锅炉工业试验结果表明:该锅炉可实现高效运行和低NO_(x)排放的协同控制;锅炉NO_(x)排放质量浓度随锅炉负荷的提升而逐渐升高,提高内二次风比例和延迟三次风配入等手段均有利于降低NO_(x)排放质量浓度;二次风当量比在0.4左右时NO_(x)排放质量浓度最低;锅炉热效率可达到93.08%,在50%~100%负荷范围内可实现NO_(x)原始排放质量浓度≤119 mg/m3(φ(O_(2))=6%)。Facing the increasingly serious situation of air pollution,to realize high efficient low NO_(x) combustion of pulverized coal,the technical route of combustion with fuel preheating was put forward and developed.In this technology,the pulverized coal particles are preheated to over 800℃in a CFB by partial combustion with equivalence ratio air,and then the resulting fuel gas and char particles are burned out in the furnace under air-staging conditions.Part of fuel nitrogen is removed at high temperature and in strong reducing atmosphere in the preheating process,and the NO_(x) generation can be further decreased by staged air distribution in the furnace.The results of industrial tests on a pulverized coal preheating combustion 40 t/h boiler showed that,this boiler could realize collaborative control of efficient operation and low NO_(x) emissions.The NO_(x) emission mass concentration increased with the boiler operating load,increasing the internal secondary air ratio and delaying the use of the tertiary air could both reduce the NO_(x) emission mass concentration.The NO_(x) emission mass concentration reached the lowest when the equivalent ratio of the secondary air was 0.4.Generally,the thermal efficiency of the boiler could reach 93.08%and the original NO_(x) emission mass concentration could be controlled below 119 mg/m3(φ(O2)=6%)in the range of 50%~100%operating load.

关 键 词：煤粉 预热燃烧 锅炉 高效燃烧 低NO_(x)排放 热效率 

分 类 号：TK227.1[动力工程及工程热物理—动力机械及工程]