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Layout and characteristics of each channel of multi-channel burner
1) Layout form of each channel: For a three channel burner, the layout manufacturer of each channel is basically the same, that is, external axial flow air, coal air, and cyclone are discharged from the outside to the inside, and an ignition (oil gun) channel is added in the middle. Generally speaking, the central channel is not used and is usually blocked. For a four channel recorder, the arrangement of each channel varies depending on the manufacturer. The central channel is generally used as an ignition channel, and the outermost channel is an external axial flow channel. The arrangement of other multi-channel burners is different.
2) The characteristics of various layout forms of multi-channel burners. The common feature of the improvement is that the external axial flow fan mainly has two functions: one is to "wrap" the flame, and the other is to inhale secondary high-temperature air through the coil; The role of cyclones and internal axial flow winds is mainly to help strengthen the reflux from the north to the outside, "crush" coal powder, and enhance the contact between coal particles and air.
The characteristic of the first arrangement is pre mixing at the outlet of the cyclone and outer shaft, which makes the axial flow tend towards the center during mixing, has strong penetration force towards the cyclone, maintains a high cyclone intensity of the main air, and is conducive to the entrainment and reflux of combustion flue gas. The indecisive coal channel is surrounded by cyclones and axial winds to appropriately increase the CO2 concentration at the flame root and reduce the O2 content. Under the condition of not affecting the ignition rate, it can maintain a lower temperature level and effectively suppress the generation of thermal NOX. The central wind cannot counteract the residual negative pressure generated by the high whirlwind intensity at the root of the flame. Unignited coal is sucked away, causing backfire at the outlet of the pressurized chamber nozzle, which affects the stability of the flame.