660MW超超临界燃煤锅炉降低CO排放的试验研究  

Experimental Study of a 660 MW Ultra-super-critical Opposed Combustion Coal-fired Boiler for Reducing CO Emissions

作　　者：夏文静[1] 衡丽君[2] 何长征[3] 韦红旗[3] 

机构地区：[1]中冶华天工程技术有限公司,江苏南京210019 [2]河南城建学院能源与建筑环境工程学院,河南平顶山467036 [3]东南大学能源与环境学院,江苏南京210096

出　　处：《热能动力工程》2014年第1期58-64,108-109,共7页Journal of Engineering for Thermal Energy and Power

摘　　要：超超临界或超临界对冲燃煤锅炉的燃烧器多采用先进的低NOx旋流燃烧器及炉内空气分级燃烧技术,主燃烧器区域保持在缺氧、富燃料条件下燃烧,以控制NOx的排放。但是,这导致锅炉CO排放浓度偏高,加之炉内燃烧可能存在的偏差,使得这一现象更为突出。本文以某660 MW超超临界对冲燃煤锅炉为研究对象,基于燃烧调整试验,分析了CO和NOx排放及锅炉热效率之间的相关特性,同时通过运行参数的调整,得出各参数对三者的影响规律,并给出了相关优化运行方式。通过优化调整,锅炉修正后效率可维持93.7%以上(设计值93.61%),且飞灰含碳量在2.0%以下、CO排放约500 mg/m3、NOx排放约250 mg/m3,运行的经济性和安全性较习惯运行方式有较大幅度的提高。The burners of ultra-supercritical or supercritical opposed combustion coal-fired boilers mostly adopt advanced swirling burners with low NOxemissions and in-furnace air staged combustion technology. The combustion in the main combustion zone of the burners is conducted under the condition of insufficient oxygen and rich fuel in a hope to contain the emissions of NOx. However,this will lead to an excessively high CO emissions concentration of the boilers and any deviation possibly existing in the combustion in the furnace will make such a phenomenon become more outstanding. With a 660 MW ultra-supercritical opposed combustion coal-fired boiler serving as the object of study,the correlation among CO emissions,Cox emissions and efficiency was analyzed on the basis of a combustion adjustment test. The research results show that negative correlation characteristics do exist among them. On this basis,an ideal balance point was found out between the cost-effectiveness and safety of the boiler during its operation,making the boiler maintain its efficiency higher than 93. 7% and the CO and NOxemissions attain around 500 and 250 mg /Nm3.

关 键 词：660 MW 超超临界 对冲燃烧 旋流燃烧器 CO NOx 

分 类 号：TK16[动力工程及工程热物理—热能工程]