摘要
针对某厂采用 EI-DRB 型燃烧器的 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、热态实验,证明 EI-DRB 型燃烧器没有回流区,不利于稳然。经改进得出了适于 1025t/h 锅炉的浓淡旋流煤粉燃烧器结构。试验表明:浓淡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在 1.15、1.83 以上,扩展角大于 70.1°,可卷吸足够的高温烟气及时点燃煤粉;整个射流温度水平随着直流二次风率的增加而下降。得出了给粉机转速对两种燃烧器出口温度场的影响规律。采用浓淡燃烧器后,当电负荷降至 135MW 时,锅炉可以不投油稳定运行。
With the enhanced ignition-dual register burner, a 1025 t/h coal-fired boiler could not achieve a stable flame when burning the designed low-grade coal. Experiments on a single- phase test facility and the boiler were done to solve the problem. A new bias combustion pulverized coal swirl burner matching the boiler is gotten. Experiments show: with the new burner the ratio of the largest diameter and length of the central recirculation zone to the outer diameter of the burner are over 1.15 and 1.83, and the flow divergent angle is over 70.1°. This central recirculation zone can provide enough high temperature gas to ignite pulverized coal. The higher the ratio of the non-swirl secondary air is, the lower the gas temperature in the burner region is. The EI-DRB has no the central recirculation zone. It is disadvantage to the flame stabilization. The influence of the rotational speeds of the feeder on the distribution of the gas temperature in the burner region is gotten with two types of burner. With the new burners, the boiler operates stably at 135MW.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2004年第4期189-194,共6页
Proceedings of the CSEE
基金
国家电力公司重大课题资助项目(KJ00-02-16)。
关键词
1025t/h燃煤锅炉
浓淡旋流煤粉燃烧器
EI-DRB型
燃烧技术
Bias combustion pulverized coal swirl burner
Enhanced ignition-dual register burner(EI-DRB)
Aerodynamic field
Gas temperature field
