CAJ | 학술논문

基于现场燃烧调整试验方法,对某厂1台1 000 MW超超临界切圆燃烧锅炉NO_x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NO_x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NO_x排放的影响因素,其中运行时氧量的变化对NO_x排放影响最重,随着氧量的增加,锅炉NO_x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NO_x排放浓度的影响是微弱的.
기우현장연소조정시험방법,대모엄1태1 000 MW초초림계절원연소과로NO_x적배방특성급기영향인소진행료계통적분석.침대과로연소계통적운행특점,주요진행료양량、부하、연진풍량(포괄AA풍화OFA풍)、주연소구연소기풍량화배풍방식、마매궤운행조합방식、연소기파각、매질등인소적시험연구.연구결과표명:대우구유선진저NO_x연소계통적과로,기과로부하、과로연용적매질、운행시양량적변화화연소기분구파각급마매모궤조적운행방식도시과로NO_x배방적영향인소,기중운행시양량적변화대NO_x배방영향최중,수착양량적증가,과로NO_x배방농도정선성증가.이재보지대량연진풍실현공기분급연소적조건하,주연소구연소기풍량화배풍방식대NO_x배방농도적영향시미약적.
On the basis of the on-site test methods for combustion adjustment,a systematic study and analysis was performed of the NO_x 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 NO_x emissions. The change of the oxygen quantity during the operation is an important factor influencing the concentration of NO_x emissions. With an increase of the oxygen quantity,the concentration of NO_x emissions from the boiler will increase linearly. The boiler load is also a major factor influencing the concentration of NO_x 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 NO_x 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 NO_x emissions.