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燃煤粉锅炉,主要适用于燃烧反应低的无烟煤和贫煤的混合煤质,其结构与常规燃煤锅炉不同,易于实现燃烧过程的多级配风。即可控制着火阶段的着火温度,又可加强燃烧后的混合,促进低反应燃料的燃烬,这样强化了稳燃条件,在烧无烟煤和贫煤的混合煤时,最低不投油稳燃负荷可达到40%~55%。由于煤粉炉火焰是下行然后迂回,因此火焰中心就在煤粉喷口附近,这样就形成了一个高温回流区,易于劣质煤的着火,利于稳燃。但燃烧调节较复杂,如调节不当,易在受热面处结焦积渣。造成不必要的热损失,严重者造成锅炉灭火。
Pulverized coal-fired boilers are mainly suitable for anthracite and lean mixed coal with low combustion reaction. The structure of the pulverized coal-fired boilers is different from that of conventional coal-fired boilers and it is easy to realize multi-stage air distribution in the combustion process. You can control the ignition phase of the ignition temperature, but also enhance the combustion after the mixture to promote the combustion of low-reactive fuel embers, thus strengthening the steady-state combustion conditions, burning anthracite and lean coal mixed coal, the minimum non-oil stable combustion load Can reach 40% to 55%. As the pulverized coal stove flame is down and then roundabout, so the flame center in the pulverized coal near the mouth, thus forming a high temperature reflux zone, easy to poor quality coal fire, which will help stabilize the combustion. However, the combustion regulation is more complex, such as improper regulation, easy to heat the surface coke slag. Resulting in unnecessary heat loss, serious cases of boiler fire.