On the selection of fans for desulfurization towers
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Question: The fuel boiler (4 tons) is already equipped with a blower (located at the front of the boiler). Now we have a set of wet flue gas desulfurization equipment (with a resistance of 1300–1500 Pa), and we need to select a blower to be placed behind the desulfurization equipment Also, is it possible to install a blower before the flue gas enters the desulfurization equipment to increase the air pressure, thereby reducing the use of pipes?
It’s a bit general; the fans used in desulfurization equipment depend on the operating conditions, and an exhaust fan is required behind the boiler.
It is possible to install a pressure-increasing fan in front of the desulfurization unit or an exhaust fan behind it. If a pressure-increasing fan is placed in front of the desulfurization unit, the flue gas passing through the fan is dry, which helps prevent corrosion; at this time, the desulfurization unit operates under slightly positive pressure； When exhaust air is introduced after the desulfurization unit, the flue gas becomes wet, resulting in severe corrosion. Whether fans are installed before or after the desulfurization unit, as long as there is a slight negative pressure in the boiler furnace, it is not necessary to use a blower in front of the boiler; the booster fan or exhaust fan of the desulfurization unit only needs to overcome the resistance posed by that unit.