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为了了解不同配风工况对煤粉燃烧过程的影响,本文以四角切圆燃烧煤粉锅炉为研究对象,采用k-ε-f-g即混即燃气相燃烧模型与煤的双挥发反应热解模型对不同工况下炉内流动、燃烧等过程进行了数值模拟。其结果表明:当机组负荷一定时,适当减少一次风率使整个炉膛火焰充满度大大得到改善,火焰长度与煤粉着火距离有所缩短;采用倒宝塔型二次风配风方式对于较差煤种的稳定着火较为有利;而停止三次风时,炉膛温度水平较高,煤粉燃烧完全,锅炉效率有所提高。
In order to understand the influence of different working conditions on pulverized coal combustion process, this paper takes tangentially fired pulverized coal fired boiler as the research object, using the k-ε-fg mixed fuel gas phase combustion model and the coal two-volatility pyrolysis model The numerical simulation of the flow, combustion and other processes in different working conditions is carried out. The results show that when the load of the unit is constant, the primary wind rate is reduced properly to improve the flame fullness of the furnace and the flame length is shortened from the ignition distance of the pulverized coal. With the inverted pagoda secondary air distribution method, Stable fire is more favorable; and stop the third wind, the higher the furnace temperature, pulverized coal combustion, the boiler efficiency has improved.