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author：Martin 2019-10-22
For large water tube boilers, FGR recirculated flue gas is mixed with fresh air.According to the different layout position is divided into pre - premix and post - premix.Pre-mixing is to arrange the mixing bellows in front of the blower, recirculating the flue gas and fresh air mixed, then through the blower, is sent to the burner to participate in combustion, in the mixed air into the air before the blast air duct set trap, to exclude condensed water, fan selection should also choose anti-corrosion fan.After premix, the mixed bellows are arranged in the blower, and the recirculated flue gas is fed into the mixed bellows through the recirculating blower, mixed with the fresh air from the blower, and sent to the burner for combustion.The commissioning condition of the blower should be better than the premixed condition before, but a lot of condensed water will be generated in the air duct, so the water test valve should be set in the place of the mixing bellows and the smoke air duct.