摘要
利用Fluent计算软件对一台670 t/h浓淡煤粉锅炉的常规空气燃烧和局部富氧燃烧过程进行数值模拟,得到了两种燃烧气氛下炉内的空气动力场、温度场和烟气中各组分物质的量浓度的分布。结果表明:在"三高区"通入富氧助燃对底层燃烧器煤粉气流的燃烧影响较大,煤粉着火提前,底层一次风高温区增大,有利于提高燃烧器的稳燃性能,且火焰中心位置下移,使煤粉在燃烧器区域燃烧完全,降低了炉膛出口烟气温度。局部富氧燃烧的高温火焰集中在炉膛中心位置,水冷壁附近保持较高的氧化性气氛,对水冷壁起到较好的保护作用,可有效防止结渣和高温腐蚀。
Conventional air combustion and local oxygen-enriched combustion process of a 670t/h pulverized coal boiler were simulated by Fluent calculation software, which got the aerodynamic field, temperature field and mass concentration distribution of various gas components under both combustion air atmosphere. Results show that the ‘three highs＇ area ventilation with oxygen-enriched combustion which has a significant impact on the bottom pulverized coal combustion burner, makes pulverized coal ignition advance, the underlying primary air temperature zone increase, the performance of stable combustion burner improve, and the flame center position down, so that the complete combustion of pulverized coal in the burner reduces the exit flue gas temperature of the furnace. The high temperature flame of local oxygen-enriched combustion concentrates in the furnace central location, maintains a high oxidizing atmosphere near the water-cooled wall, and plays a better role in the water-cooled wall protection, which can prevent effectively slagging and high-temperature corrosion.
出处
《电站系统工程》
2015年第2期8-10,共3页
Power System Engineering
关键词
浓淡燃烧
局部富氧
稳燃
数值模拟
rich-lean combustion
local oxygen-enriched
stable combustion
numerical simulation
