Radial air staged rotational flow pulverized coal combustion device adopting flue gas recirculation
A flue gas recirculation and air staging technology, applied in the combustion of lump fuel and gaseous fuel, the combustion of liquid fuel and gaseous fuel, the combustion of gaseous fuel and powder fuel, etc. The furnace is prone to slagging and other problems, so as to reduce the generation of NOx, avoid the increase of NOx generation, and reduce the average temperature level.
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specific Embodiment approach 1
[0031] Specific implementation mode one: combine Figure 1 to Figure 4 Describe this embodiment, a swirl pulverized coal combustion device using flue gas recirculation radial air classification in this embodiment, it includes a combustion system, is characterized in that: it also includes a flue gas recirculation system; flue gas recirculation The circulation system is connected to the combustion system, and the combustion system is installed on the boiler. The flue gas recirculation system introduces the flue gas at the tail of the boiler into the secondary air pipes separated at all levels of the combustion system, and adjusts the amount of flue gas introduced through the valve;
[0032] The flue gas recirculation system includes a recirculation fan 7, a recirculation flue gas pipe 8, a plurality of recirculation flue gas pipe valves 9, a plurality of separated secondary air pipe valves 10 and a plurality of recirculation flue gas branch pipes 11, the combustion system The upp...
specific Embodiment approach 2
[0033] Specific implementation mode two: combination Figure 1 to Figure 4 Describe this embodiment, the combustion system of this embodiment comprises swirl pulverized coal burner 1, a plurality of separated secondary air nozzles 2 and a plurality of separated secondary air swirlers 3, swirl pulverized coal burner 1 is installed in the boiler Above, a plurality of separated secondary air nozzles 2 are arranged in a double-layer ring around the swirl pulverized coal burner 1, and the circle where the outlet center of each layer of separated secondary air nozzles 2 is arranged coaxially with the swirl pulverized coal burner 1, The pipe diameter of the separation secondary air pipe where each separation secondary air spout 2 is located is consistent and the outlet end of the separation secondary air pipe is flush with the inner wall of the furnace 4, and each air inlet pipe 12 is connected with multiple air pipes of one of the layers. The separated secondary air nozzles 2 are co...
specific Embodiment approach 3
[0034] Specific implementation mode three: combination figure 1 , figure 2 and Figure 4 Describe this embodiment, the boiler of this embodiment is a horizontal boiler, and the boiler where the swirl pulverized coal burner 1 is installed is on the front wall 5 of the horizontal boiler. Such a setting has a wide range of applications. Other compositions and connections are the same as those in Embodiment 1 or 2.
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