摘要
提出了中心给粉旋流煤粉燃烧器,并针对某厂采用EI-DRB型燃烧器设计燃用贫煤的1025t/h锅炉稳燃能力差,不能燃用设计煤质的问题,进行了实验室冷态试验及锅炉冷、热态试验,得出了新型的燃烧器结构,并将下层8只燃烧器改造为新型燃烧器。试验表明,中心给粉燃烧器的回流区最大直径、长度与燃烧器最外层直径之比分别为1．40和1．89,可卷吸足够的高温烟气及时点燃煤粉,得出了外二次风叶片角度、一次风量、二次风量及三次风对燃烧器出口射流的影响规律:在实际运行参数下,EI-DRB型燃烧器没有回流区,不利于稳定燃烧。得出了二次风挡板开度和给粉机转数对燃烧器出口处温度场的影响规律。采用新型燃烧器后,锅炉效率提高,当电负荷降至140 MW时,锅炉可以不投油稳定运行,在燃用贫煤、无烟煤和贫煤的混煤时(混合比为1:1),锅炉在高负荷和低负荷下均可稳定运行。锅炉NOx排放下降。
The central-fuel-rich （CFR） swirl coal combustion burner is given. With the enhanced ignition-dual register burner （EI-DRB）, a 1 025 t/h coal-fired boiler could not achieve a stable flame when burning the designed lean coal. Experiments on a single-phase test facility and the boiler are done and the CFR burner matching the boiler is gotten. Experiments show that with the CFR burner the ratio of the largest diameter and length of the central recirculation zone to the outer diameter of the outer secondary air duct of the new burner are over 1.40 and 1.89. This central recirculation zone can provide enough high temperature gas to ignite pulverized coal. The EI-DRB has no central recirculation zone. It is the disadvantage of the flame stabilization. The influence of the rotational speed of the feeder and position of the secondary air damper on the distribution of the gas temperature in the burner region is gotten. With the CFR burners, the boiler operates stably at 140 MW without auxiliary fuel oil. The boiler could operate stably at rated or low load with burning lean-coal or the mixture of lean-coal and anthracite （the mixture ratio is 1）. The emission of NOx of boiler decreases.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2006年第3期221-226,共6页
Journal of Mechanical Engineering
基金
2004年度教育部新世纪优秀人才支持计划基金
黑龙江省科技攻关课题(GC05A314)资助项目
关键词
中心给粉旋流燃烧器
EI-DRB型燃烧器
空气动力场
空气温度场
Central-Fuel-rich swirl coal combustion burner
Enhanced ignition-dual register burner
Aerodynamic field
Gas temperature field
