富氧煤粉燃烧锅炉概念设计研究  

STUDY ON CONCEPTUAL DESIGN OF UTILITY BOILER BURNING OXYGEN-ENRICHED PULVERIZED COAL

作　　者：阎维平[1] 米翠丽[1] 

机构地区：[1]华北电力大学教育部"电站设备状态监测与控制"重点实验室,河北保定071003

出　　处：《热力发电》2011年第2期1-7,共7页Thermal Power Generation

基　　金：国家高技术研究发展计划(863计划)基金资助项目<增压流化床富氧燃煤发电新技术>(2009AA05Z310)

摘　　要：以亚临界300 MW机组锅炉为研究对象,构建了富氧燃烧锅炉原则性热力系统,并分别从炉膛辐射、对流受热面、尾部受热面、制粉系统及气体污染物的处理与回收等方面进行了富氧燃烧锅炉的概念设计。计算与分析表明,大约35%O2/65%CO2混合气氛下的富氧燃烧锅炉具有明显的优势,锅炉炉膛部分的辐射换热份额大大增加,炉膛辐射换热量较空气燃烧增加约15%;对流换热所占份额减少,相对于空气燃烧减少约19%;锅炉烟气侧的运行阻力大幅度减小;工质在炉膛内的辐射吸热将增加约42%,更多的过热受热面移入炉膛上部,锅炉总的受热面数量低于空气燃烧锅炉;制粉系统磨煤电耗显著降低,磨煤效率提高;锅炉制造成本与运行费用有望较大幅度降低,可部分地弥补由于制氧而增加的成本。Taking boiler of supercritical 300 MW unit as the object of study,a principle thermodynamic system for boiler with oxygen-enriched combustion has been constructed and a conceptual design of said boiler being carried out from aspects of radiation in the furnace,heating surface of convection,heating surface in tail section,system of coal-pulverizing,removel and recovery of gaseous pollutants etc..Calculation and analysis show that the boiler with oxygen-enriched combustion has remarkable surperioty under atmosphere of about 35% O2 and 65% CO2;the share of radiation heat transfer in furnace of the boiler is greatly increased,the quantity of radiation heat transfer in the furnace increased about 15% than that of air combustion;the share of convection heat transfer is decreased,reducing 19% as compared with air combustion;the resistance at flue gas side in operation of boiler is greatlydecreased,the radiation heat absorption by working medium in the furnace will increase 42%,more superheated heating surface will move into upper part of the furnace,the total area of heating surface of the boiler will less than that of boiler with air combustion;the specific electric energy consumption in coal-pulverizing system is substantially decreased,enhancing the efficiency of coal-pulverizing,the manufacture cost of boiler and expenditure in its operation are hopeful to be greatly reduced,these can partially compensate the increased cost due to oxygen preparation.

关 键 词：富氧燃烧 锅炉 概念设计 CO2浓度 CO2捕集 

分 类 号：TK224.1[动力工程及工程热物理—动力机械及工程]