Control system for flue gas oxygen content of layer combustion boiler based on flue gas recirculation
A technology of flue gas recirculation and boiler flue gas, which is applied in the direction of controlled combustion, solid fuel combustion, and combustion methods. The effect of large load variation range, reduction of initial emission concentration, and reduction of manual operation intensity
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Embodiment 1
[0024] Such as Figure 1 to Figure 2 As shown, a layer-fired boiler flue gas oxygen content control system based on flue gas recirculation is mainly composed of a layer-fired boiler 1, a blower 2, a flue gas recirculation fan 3, a zirconia analyzer 4, an air duct 5 and a DCS The system (or PLC system) consists of 6, the furnace of the layer-fired boiler 1 is connected with the blower 2 through the air duct 5, the smoke outlet of the layer-fired boiler 1 is installed with a zirconia analyzer 4, and the smoke outlet of the layer-fired boiler 1 A flue gas recirculation fan 3 is arranged on the channel, and the flue gas recirculation fan 3 is connected to the air inlet of the blower 2 through the air pipe 5, and the flue gas recirculation fan 3 is connected with a first fan frequency conversion controller 10 and an electric regulating valve 7 , the electric regulating valve one 7 is installed on the air pipe 5 connecting the flue gas recirculation fan 3 to the air inlet of the blo...
Embodiment 2
[0026] Such as Figure 1 to Figure 2 As shown, a layer-fired boiler flue gas oxygen content control system based on flue gas recirculation is mainly composed of a layer-fired boiler 1, a blower 2, a flue gas recirculation fan 3, a zirconia analyzer 4, an air duct 5 and a DCS The system (or PLC system) consists of 6, the furnace of the layer-fired boiler 1 is connected with the blower 2 through the air duct 5, the smoke outlet of the layer-fired boiler 1 is installed with a zirconia analyzer 4, and the smoke outlet of the layer-fired boiler 1 A flue gas recirculation fan 3 is arranged on the channel, and the flue gas recirculation fan 3 is connected to the air inlet of the blower 2 through the air pipe 5, and the flue gas recirculation fan 3 is connected with a first fan frequency conversion controller 10 and an electric regulating valve 7 , the electric regulating valve one 7 is installed on the air pipe 5 connecting the flue gas recirculation fan 3 to the air inlet of the blo...
Embodiment 3
[0029] Such as Figure 1 to Figure 2 As shown, a layer-fired boiler flue gas oxygen content control system based on flue gas recirculation is mainly composed of a layer-fired boiler 1, a blower 2, a flue gas recirculation fan 3, a zirconia analyzer 4, an air duct 5 and a DCS The system (or PLC system) consists of 6, the furnace of the layer-fired boiler 1 is connected with the blower 2 through the air duct 5, the smoke outlet of the layer-fired boiler 1 is installed with a zirconia analyzer 4, and the smoke outlet of the layer-fired boiler 1 A flue gas recirculation fan 3 is arranged on the channel, and the flue gas recirculation fan 3 is connected to the air inlet of the blower 2 through the air pipe 5, and the flue gas recirculation fan 3 is connected with a first fan frequency conversion controller 10 and an electric regulating valve 7 , the electric regulating valve one 7 is installed on the air pipe 5 connecting the flue gas recirculation fan 3 to the air inlet of the blo...
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