摘要
基于现场燃烧调整试验方法,对某厂1台1000MW超超临界切圆燃烧锅炉NOx的排放特性及其影响因素进行了系统的分析。针对锅炉燃烧系统的运行特点,主要进行了氧量、负荷、燃尽风量(包括AA风和OFA风)、主燃烧区燃烧器风量和配风方式、磨煤机运行组合方式、燃烧器摆角、煤质等因素的试验研究。研究结果表明:对于具有先进低NOx燃烧系统的锅炉,其锅炉负荷、锅炉燃用的煤质、运行时氧量的变化和燃烧器喷口摆角及磨煤耗机组的运行方式都是锅炉NOx排放的影响因素,其中运行时氧量的变化对NOx排放影响最重,随着氧量的增加,锅炉NOx排放浓度呈线性增加。而在保持大量燃尽风实现空气分级燃烧的条件下,主燃烧区燃烧器风量和配风方式对NOx排放浓度的影响是微弱的。
On the basis of the on-site test methods for combustion adjustment, a systematic study and analysis was performed of the NOx emissions characteristics of a 1 000 MW ultra-supercritical tangentially-fired boiler in a power plant along with its influencing factors. In the light of the operation characteristics of the boiler combustion system, mainly studied were such influencing factors as the oxygen quantity, load, burn-out air quantity (including additional air and over-fired air), air quantity and air distribution mode for burners in the main combustion zone, ball mill operation combination mode, swaying angle of burners and coal ranks etc. The test and research results show that as an air staged combustion in the furnace is adopted, it is decisive that the change of coal quality will remarkably affect the concentration of NOx emissions. The change of the oxygen quantity during the operation is an important factor influencing the concentration of NOx emissions. With an increase of the oxygen quantity, the concentration of NOx emissions from the boiler will increase linearly. The boiler load is also a major factor influencing the concentration of NOx emissions. The extent of such an influence depends on the boiler load and the operating oxygen quantity during the corresponding load. The swaying of the burner spout and the change of the ball mill operation mode will exercise a significant influence on the concentration of NOx emissions from the boiler. Relative to the influence exerted by the above-mentioned factors, under the condition that a large amount of burn-out air is maintained to realize an air staged and fractional combustion, the change of the primary and secondary air distribution in the main combustion zone has a weak influence on the concentration of NOx emissions.
出处
《热能动力工程》
CAS
CSCD
北大核心
2010年第2期221-225,共5页
Journal of Engineering for Thermal Energy and Power
关键词
超超临界锅炉
低NOX燃烧
NOX排放
燃烧器风量
配风方式
运行因素
ultra-supercritical boiler, low NOx combustion, NOx emissions, burner air feed, air distribution mode, operating factors
