Alkali steam collecting and exhausting device

The utility model relates to an alkali steam collecting and exhausting device. The device comprises a first exhaust fan, a second exhaust fan, an exhaust pipe, an alkali liquor treatment mechanism anda bag-type dust collector, the number of the first exhaust fans is at least two. The first exhaust fan is arranged at the periphery of the alkaline water heating tank; the second exhaust fan is arranged above the alkaline water heating tank; the first exhaust fan is provided with a first air collecting hopper; the first air collecting hopper is box-shaped; the second exhaust fan is provided witha second air collecting hopper; the second air collecting hopper is conical; the first air collecting hopper and the second air collecting hopper are both made of PP materials. Impellers of the firstexhaust fan and the second exhaust fan are made of glass fiber reinforced plastics, electromechanical units of the exhaust fans are provided with corrosion-resistant protective layers, the first exhaust fan and the second exhau