摘要
火电机组灵活性改造后,锅炉低负荷稳燃能力提升,然而高负荷下由于主燃烧器区域烟气温度升高,容易引发结焦、NO_(x)生成量偏高等问题。以600 MW前后墙对冲锅炉为研究对象,针对灵活性改造后锅炉易结焦的原因展开分析并进行了燃烧优化试验。结果表明:结焦主要是由主燃烧器区域烟气温度升高以及还原性气氛引起的,通过弱化燃烧器旋流、提升燃烧器直流风占比、降低磨煤机出口温度、合理配风、提升一次风压和控制主燃烧器区域氧量等技术手段,可在保障低负荷稳燃能力的同时,抑制主燃烧器区域结焦。
After the flexible modification of thermal power units,the stable combustion ability of low load is improved.However,the flue gas temperature in the main burner area of the furnace under high load is also bound to be increased,which is easy to cause the problem of slagging and higher NO_(x) production.Taking a 600 MW front and rear wall hedge unit as the research object,the analysis of the reasons for the easy coking of the boiler after flexibility modification and combustion optimization test were conducted.Results show that coking is mainly caused by the increase of flue gas temperature in the main burner area and the reducing atmosphere.By weakening the swirl of the burner,increasing the proportion of direct current air in the burner,reducing the temperature at the outlet of the mill,rationally distributing air,increasing the primary air pressure,controlling the oxygen content in the main burner area and other technical means,the coking in the main burner area can be restrained while ensuring the stable combustion ability under low load.
作者
吕为智
赵旭
何翔
马达夫
LÜWeizhi;ZHAO Xu;HE Xiang;MA Dafu(Shanghai Power Equipment Research Institute Co.,Ltd.,Shanghai 200240,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2023年第11期1406-1412,共7页
Journal of Chinese Society of Power Engineering
关键词
灵活性改造
外置分离器燃烧器
低负荷稳燃
结焦
燃烧优化
flexible modification
burner with external separator
low-load stable combustion
slagging
combustion optimization
